U.S. patent application number 15/213185 was filed with the patent office on 2018-01-11 for optical imaging lens.
The applicant listed for this patent is GENIUS ELECTRONIC OPTICAL CO., LTD.. Invention is credited to Matthew Bone, Bai Na Chen, Feng Chen, Yan Bin Chen.
Application Number | 20180011287 15/213185 |
Document ID | / |
Family ID | 58230441 |
Filed Date | 2018-01-11 |
United States Patent
Application |
20180011287 |
Kind Code |
A1 |
Bone; Matthew ; et
al. |
January 11, 2018 |
OPTICAL IMAGING LENS
Abstract
Present embodiments provide for an optical imaging lens. The
optical imaging lens comprises a first lens element, a second lens
element, a third lens element and a fourth lens element positioned
in an order from an object side to an image side. Through
controlling the convex or concave shape of the surfaces of the lens
elements and designing parameters satisfying at least one
inequality, the optical imaging lens shows better optical
characteristics and enlarge field angle while the total length of
the optical imaging lens is shortened.
Inventors: |
Bone; Matthew; (Xiamen,
CN) ; Chen; Yan Bin; (Xiamen, CN) ; Chen; Bai
Na; (Xiamen, CN) ; Chen; Feng; (Xiamen,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
GENIUS ELECTRONIC OPTICAL CO., LTD. |
Taichung City |
|
TW |
|
|
Family ID: |
58230441 |
Appl. No.: |
15/213185 |
Filed: |
July 18, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G02B 13/004 20130101;
G02B 9/58 20130101; G02B 9/34 20130101; G02B 27/0025 20130101; G02B
13/06 20130101 |
International
Class: |
G02B 9/34 20060101
G02B009/34; G02B 13/00 20060101 G02B013/00; G02B 9/58 20060101
G02B009/58; G02B 27/00 20060101 G02B027/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 5, 2016 |
CN |
201610523509.3 |
Claims
1. An optical imaging lens, sequentially from an object side to an
image side along an optical axis, comprising first, second, third
and fourth lens elements, each of said first, second, third and
fourth lens elements having refracting power, an object-side
surface facing toward said object side and an image-side surface
facing toward said image side, wherein: said object-side surface of
said first lens element comprises a convex portion in a vicinity of
the optical axis, and said image-side surface of said first lens
element comprises a concave portion in a vicinity of a periphery of
said first lens element; said second lens element has positive
refracting power, and said image-side surface of said second lens
element comprises a convex portion in a vicinity of the optical
axis; said object-side surface of said third lens element comprises
a convex portion in a vicinity of the optical axis; said
object-side surface of said fourth lens element comprises a concave
portion in a vicinity of a periphery of said fourth lens element,
and said image-side surface of said fourth lens element comprises a
convex portion in a vicinity of a periphery of said fourth lens
element; said optical imaging lens comprises no other lenses having
refracting power beyond said first, second, third and fourth lens
elements; a distance between said object-side surface of said first
lens element and an image plane along the optical axis is
represented by TTL, a central thickness of said second lens element
along the optical axis is represented by T2, an air gap between
said third lens element and said fourth lens element along the
optical axis is represented by G34, and TTL, T2 and G34 satisfy the
equation: TTL/(T2+G34).ltoreq.4.5, and TTL and G34 satisfy the
equation: TTL/G34.ltoreq.13.7.
2. The optical imaging lens according to claim 1, wherein an air
gap between said first lens element and said second lens element
along the optical axis is represented by G12, and G12 and T2
satisfy the equation: G12/T2.gtoreq.1.3.
3. The optical imaging lens according to claim 1, wherein an air
gap between said first lens element and said second lens element
along the optical axis is represented by G12, and TTL and G12
satisfy the equation: TTL/G12.ltoreq.5.4.
4. The optical imaging lens according to claim 1, wherein a sum of
the central thicknesses of all lens elements is represented by ALT,
an air gap between said first lens element and said second lens
element along the optical axis is represented by G12, and ALT, G12,
and G34 satisfy the equation: ALT/(G12+G34).ltoreq.2.
5. The optical imaging lens according to claim 1, wherein an air
gap between said first lens element and said second lens element
along the optical axis is represented by G12, and wherein TTL, G12
and G34 satisfy the equation: TTL/(G12+G34).ltoreq.4.
6. The optical imaging lens according to claim 1, wherein a sum of
the central thicknesses of all lens elements is represented by ALT,
an air gap between said first lens element and said second lens
element along the optical axis is represented by G12, and ALT and
G12 satisfy the equation: ALT/G12.ltoreq.2.6.
7. The optical imaging lens according to claim 1, wherein a central
thickness of said third lens element along the optical axis is
represented by T3, and T2, T3 and G34 satisfy the equation:
(T2+T3)/G34.ltoreq.5.
8. The optical imaging lens according to claim 1, wherein an air
gap between said first lens element and said second lens element
along the optical axis is represented by G12, a central thickness
of said third lens element along the optical axis is represented by
T3, and G12, T3 and T2 satisfy the equation:
(G12+T3)/T2.gtoreq.2.3.
9. The optical imaging lens according to claim 1, wherein a sum of
all air gaps between all lens elements along the optical axis is
represented by Gaa, and Gaa and T2 satisfy the equation:
Gaa/T2.gtoreq.2.2.
10. The optical imaging lens according to claim 1, wherein a
distance from said object-side surface of said first lens element
to said image-side surface of said fourth lens element along the
optical axis is represented by TL, an air gap between said first
lens element and said second lens element along the optical axis is
represented by G12, and TL, G12 and G34 satisfy the equation:
TL/(G12+G34).ltoreq.3.2.
11. The optical imaging lens according to claim 1, wherein an air
gap between said first lens element and said second lens element
along the optical axis is represented by G12, and G12, G34 and T2
satisfy the equation: (G12+G34)/T2.gtoreq.1.9.
12. The optical imaging lens according to claim 1, wherein a
central thickness of said third lens element along the optical axis
is represented by T3, and T3 and G34 satisfy the equation:
T3/G34.ltoreq.2.5.
13. The optical imaging lens according to claim 1, wherein an air
gap between said second lens element and said third lens element
along the optical axis is represented by G23, and G23, T2 and G34
satisfy the equation: (T2+G23)/G34.ltoreq.3.5.
14. The optical imaging lens according to claim 1, wherein a sum of
the central thicknesses of all lens elements is represented by ALT,
and ALT and G34 satisfy the equation: ALT/G34.ltoreq.6.9.
15. (canceled)
16. The optical imaging lens according to claim 1, wherein a
distance from said object-side surface of said first lens element
to said image-side surface of said fourth lens element along the
optical axis is represented by TL, and TL and G34 satisfy the
equation: TL/G34.ltoreq.11.
17. The optical imaging lens according to claim 1, wherein a
central thickness of said first lens element along the optical axis
is represented by T1, and T2, T1 and G34 satisfy the equation:
(T2+T1)/G34.ltoreq.3.5.
18. The optical imaging lens according to claim 1, a central
thickness of said fourth lens element along the optical axis is
represented by T4, and T4, T2 and G34 satisfy the equation:
(T4+T2)/G34.ltoreq.3.5.
19. The optical imaging lens according to claim 1, wherein an
effective focal length of said optical imaging lens is represented
by EFL, and EFL and G34 satisfy the equation:
EFL/G34.ltoreq.2.6.
20. The optical imaging lens according to claim 1, wherein a
central thickness of said fourth lens element along the optical
axis is represented by T4, a central thickness of said third lens
element along the optical axis is represented by T3, and T4, T3 and
G34 satisfy the equation: (T4+T3)/G34.ltoreq.3.2.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority to P.R.C. Patent
Application No. 201610523509.3 filed on Jul. 5, 2016, which is
hereby incorporated by reference in its entirety.
TECHNICAL FIELD
[0002] The present disclosure relates to an optical imaging lens,
and particularly, to an optical imaging lens having four lens
elements.
BACKGROUND
[0003] Technology improves every day, continuously expanding
consumer demand for increasingly compact electronic devices, for
example, mobile phones, cameras, tablet personal computers,
personal digital assistants, vehicle camera device, VR tracker,
etc. In that key components for the optical imaging lenses
incorporated into consumer electronic products should keep pace
with technological improvements in order to meet the expectations
of consumers' expectations. Some important characteristics of an
optical imaging lens include image quality and size. However,
reducing the size of the imaging lens while achieving good optical
characteristics and enlarging field of view and aperture in respect
to driving or an insufficient light environment presents
challenging problems. For example, in a typical optical imaging
lens system having four lens elements, the distance from the object
side surface of the first lens element to an image plane along the
optical axis is too large to accommodate the slim profile of
today's cell phones or digital cameras.
[0004] Decreasing the dimensions of an optical lens while
maintaining good optical performance may not only be achieved by
scaling down the lens. Rather, these benefits may be realized by
improving other aspects of the design process, such as by varying
the material used for the lens, or adjusting the assembly
yield.
[0005] In this manner, there is a continuing need for improving the
design characteristics of small sized optical lenses. Achieving
these advancements may require overcoming unique challenges, even
when compared to design improvements for traditional optical
lenses. However, refining aspects of the optical lens manufacturing
process that result in a lens that meets consumer demand and
provides upgrades to imaging quality are always desirable
objectives for industries, governments, and academia.
SUMMARY
[0006] The present disclosure provides for an optical imaging lens.
By controlling the convex or concave shape of the surfaces of each
lens element and the parameters in at least one equation, the
length of the optical imaging lens may be shortened while
maintaining good optical characteristics and system
functionality.
[0007] In some embodiments, an optical imaging lens may comprise
sequentially from an object side to an image side along an optical
axis, first, second, third and fourth lens elements and a cover
glass. Each of the first, second, third and fourth lens elements
may have refracting power. Additionally, the optical imaging lens
may comprise an object-side surface facing toward the object side,
an image-side surface facing toward the image side, and a central
thickness defined along the optical axis.
[0008] According to some embodiments of the optical imaging lens of
the present disclosure, the object-side surface of the first lens
element may comprise a convex portion in a vicinity of the optical
axis; the image-side surface of the first lens element may comprise
a concave portion in a vicinity of a periphery of the first lens
element; the second lens element may have positive refracting
power; the image-side surface of the second lens element may
comprise a convex portion in a vicinity of the optical axis; the
object-side surface of the third lens element may comprise a convex
portion in a vicinity of the optical axis; the object-side surface
of the fourth lens element may comprise a concave portion in a
vicinity of a periphery of the fourth lens element; the image-side
surface of the fourth lens element may comprise a convex portion in
a vicinity of a periphery of the fourth lens element; and the
optical imaging lens may comprise no other lenses having refracting
power beyond the four lens elements. Further, a distance between
the object-side surface of the first lens element and an image
plane along the optical axis is represented by TTL, a central
thickness of the second lens element along the optical axis is
represented by T2, an air gap between the third lens element and
the fourth lens element along the optical axis is represented by
G34, and TTL, T2 and G34 could be controlled to satisfy the
equation as follows:
TTL/(T2+G34).ltoreq.4.5 Equation (1).
[0009] In other exemplary embodiments, other parameters could be
taken into consideration. For example, an air gap between the first
lens element and the second lens element along the optical axis is
represented by G12, and G12 and T2 could be controlled to satisfy
the equation as follows:
G12/T2.gtoreq.1.3 Equation (2);
TTL and G12 could be controlled to satisfy the equation as
follows:
TTL/G12.ltoreq.5.4 Equation (3);
a sum of the central thicknesses of all lens elements is
represented by ALT, and ALT, G12 and G34 could be controlled to
satisfy the equation as follows:
ALT/(G12+G34).ltoreq.2 Equation (4);
TTL, G12 and G34 could be controlled to satisfy the equation as
follows:
TTL/(G12+G34).ltoreq.4 Equation (5);
ALT and G12 could be controlled to satisfy the equation as
follows:
ALT/G12.ltoreq.2.6 Equation (6);
a central thickness of the third lens element along the optical
axis is represented by T3, and G34, T2 and T3 could be controlled
to satisfy the equation as follows:
(T2+T3)/G34.ltoreq.5 Equation (7);
G12, T3 and T2 could be controlled to satisfy the equation as
follows:
(G12+T3)/T2.gtoreq.2.3 Equation (8);
a sum of all air gaps between all lens elements along the optical
axis is represented by Gaa, and Gaa and T2 could be controlled to
satisfy the equation as follows:
Gaa/T2.gtoreq.2.2 Equation (9);
a distance from the object-side surface of the first lens element
to the image-side surface of the fourth lens element along the
optical axis is represented by TL, and TL, G12 and G34 could be
controlled to satisfy the equation as follows:
TL/(G12+G34).ltoreq.3.2 Equation (10);
G12, G34 and T2 could be controlled to satisfy the equation as
follows:
(G12+G34)/T2.gtoreq.1.9 Equation (11);
T3 and G34 could be controlled to satisfy the equation as
follows:
T3/G34.ltoreq.2.5 Equation (12);
an air gap between the second lens element and the third lens
element along the optical axis G23, and T2, G23 and G34 could be
controlled to satisfy the equation as follows:
(T2+G23)/G34.ltoreq.3.5 Equation (13);
ALT and G34 could be controlled to satisfy the equation as
follows:
ALT/G34.ltoreq.6.9 Equation (14);
TTL and G34 could be controlled to satisfy the equation as
follows:
TTL/G34.ltoreq.13.7 Equation (15);
TL and G34 could be controlled to satisfy the equation as
follows:
TL/G34.ltoreq.11 Equation (16);
a central thickness of the first lens element along the optical
axis is represented by T4, and T4, T2 and G34 could be controlled
to satisfy the equation as follows:
(T2+T1)/G34.ltoreq.3.5 Equation (17);
a central thickness of the fourth lens element along the optical
axis is represented by T4, and T4, T2 and G34 could be controlled
to satisfy the equation as follows:
(T4+T2)/G34.ltoreq.3.5 Equation (18);
a back focal length of the optical imaging lens is represented by
EFL, and EFL and G34 could be controlled to satisfy the equation as
follows:
EFL/G34.ltoreq.2.6 Equation (19); or
T4, T3 and G34 could be controlled to satisfy the equation as
follows:
(T4+T3)/G34.ltoreq.3.2 Equation (20).
[0010] Aforesaid embodiments are not limited and could be
selectively incorporated in other embodiments described herein. In
some embodiments, more details about the convex or concave surface
structure could be incorporated for one specific lens element or
broadly for plural lens elements to enhance the control for the
system performance and/or resolution. It is noted that the details
listed here could be incorporated into example embodiments if no
inconsistency occurs.
[0011] By controlling the convex or concave shape of the surfaces,
exemplary embodiments of the optical imaging lens systems herein
achieve good optical characteristics, provide an enlarged aperture
and field of view, increase assembly yield, and effectively shorten
the length of the optical imaging lens.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Exemplary embodiments will be more readily understood from
the following detailed description when read in conjunction with
the appended drawing, in which:
[0013] FIG. 1 depicts a cross-sectional view of one single lens
element according to the present disclosure;
[0014] FIG. 2 depicts a schematic view of the relation between the
surface shape and the optical focus of the lens element;
[0015] FIG. 3 depicts a schematic view of a first example of the
surface shape and the efficient radius of the lens element;
[0016] FIG. 4 depicts a schematic view of a second example of the
surface shape and the efficient radius of the lens element;
[0017] FIG. 5 depicts a schematic view of a third example of the
surface shape and the efficient radius of the lens element;
[0018] FIG. 6 depicts a cross-sectional view of a first embodiment
of an optical imaging lens having four lens elements according to
the present disclosure;
[0019] FIG. 7 depicts a chart of longitudinal spherical aberration
and other kinds of optical aberrations of a first embodiment of the
optical imaging lens according to the present disclosure;
[0020] FIG. 8 depicts a table of optical data for each lens element
of the optical imaging lens of a first embodiment of the present
disclosure;
[0021] FIG. 9 depicts a table of aspherical data of a first
embodiment of the optical imaging lens according to the present
disclosure;
[0022] FIG. 10 depicts a cross-sectional view of a second
embodiment of an optical imaging lens having four lens elements
according to the present disclosure;
[0023] FIG. 11 depicts a chart of longitudinal spherical aberration
and other kinds of optical aberrations of a second embodiment of
the optical imaging lens according the present disclosure;
[0024] FIG. 12 depicts a table of optical data for each lens
element of the optical imaging lens of a second embodiment of the
present disclosure;
[0025] FIG. 13 depicts a table of aspherical data of a second
embodiment of the optical imaging lens according to the present
disclosure;
[0026] FIG. 14 depicts a cross-sectional view of a third embodiment
of an optical imaging lens having four lens elements according to
the present disclosure;
[0027] FIG. 15 depicts a chart of longitudinal spherical aberration
and other kinds of optical aberrations of a third embodiment of the
optical imaging lens according the present disclosure;
[0028] FIG. 16 depicts a table of optical data for each lens
element of the optical imaging lens of a third embodiment of the
present disclosure;
[0029] FIG. 17 depicts a table of aspherical data of a third
embodiment of the optical imaging lens according to the present
disclosure;
[0030] FIG. 18 depicts a cross-sectional view of a fourth
embodiment of an optical imaging lens having four lens elements
according to the present disclosure;
[0031] FIG. 19 depicts a chart of longitudinal spherical aberration
and other kinds of optical aberrations of a fourth embodiment of
the optical imaging lens according the present disclosure;
[0032] FIG. 20 depicts a table of optical data for each lens
element of the optical imaging lens of a fourth embodiment of the
present disclosure;
[0033] FIG. 21 depicts a table of aspherical data of a fourth
embodiment of the optical imaging lens according to the present
disclosure;
[0034] FIG. 22 depicts a cross-sectional view of a fifth embodiment
of an optical imaging lens having four lens elements according to
the present disclosure;
[0035] FIG. 23 depicts a chart of longitudinal spherical aberration
and other kinds of optical aberrations of a fifth embodiment of the
optical imaging lens according the present disclosure;
[0036] FIG. 24 depicts a table of optical data for each lens
element of the optical imaging lens of a fifth embodiment of the
present disclosure;
[0037] FIG. 25 depicts a table of aspherical data of a fifth
embodiment of the optical imaging lens according to the present
disclosure;
[0038] FIG. 26 depicts a cross-sectional view of a sixth embodiment
of an optical imaging lens having four lens elements according to
the present disclosure;
[0039] FIG. 27 depicts a chart of longitudinal spherical aberration
and other kinds of optical aberrations of a sixth embodiment of the
optical imaging lens according to the present disclosure;
[0040] FIG. 28 depicts a table of optical data for each lens
element of a sixth embodiment of an optical imaging lens according
to the present disclosure;
[0041] FIG. 29 depicts a table of aspherical data of a sixth
embodiment of the optical imaging lens according to the present
disclosure;
[0042] FIG. 30 depicts a cross-sectional view of a seventh
embodiment of an optical imaging lens having four lens elements
according to the present disclosure;
[0043] FIG. 31 depicts a chart of longitudinal spherical aberration
and other kinds of optical aberrations of a seventh embodiment of
the optical imaging lens according to the present disclosure;
[0044] FIG. 32 depicts a table of optical data for each lens
element of the optical imaging lens of a seventh embodiment of the
present disclosure;
[0045] FIG. 33 depicts a table of aspherical data of a seventh
embodiment of the optical imaging lens according to the present
disclosure;
[0046] FIG. 34 depicts a cross-sectional view of an eighth
embodiment of an optical imaging lens having four lens elements
according to the present disclosure;
[0047] FIG. 35 depicts a chart of longitudinal spherical aberration
and other kinds of optical aberrations of an eighth embodiment of
the optical imaging lens according to the present disclosure;
[0048] FIG. 36 depicts a table of optical data for each lens
element of the optical imaging lens of an eighth embodiment of the
present disclosure;
[0049] FIG. 37 depicts a table of aspherical data of an eighth
embodiment of the optical imaging lens according to the present
disclosure;
[0050] FIG. 38 depicts a cross-sectional view of a ninth embodiment
of an optical imaging lens having four lens elements according to
the present disclosure;
[0051] FIG. 39 depicts a chart of longitudinal spherical aberration
and other kinds of optical aberrations of a ninth embodiment of the
optical imaging lens according to the present disclosure;
[0052] FIG. 40 depicts a table of optical data for each lens
element of the optical imaging lens of a ninth embodiment of the
present disclosure;
[0053] FIG. 41 depicts a table of aspherical data of a ninth
embodiment of the optical imaging lens according to the present
disclosure;
[0054] FIG. 42 depicts a cross-sectional view of a tenth embodiment
of an optical imaging lens having four lens elements according to
the present disclosure;
[0055] FIG. 43 depicts a chart of longitudinal spherical aberration
and other kinds of optical aberrations of a tenth embodiment of the
optical imaging lens according to the present disclosure;
[0056] FIG. 44 depicts a table of optical data for each lens
element of the optical imaging lens of a tenth embodiment of the
present disclosure;
[0057] FIG. 45 depicts a table of aspherical data of a tenth
embodiment of the optical imaging lens according to the present
disclosure;
[0058] FIG. 46 depicts a cross-sectional view of an eleventh
embodiment of an optical imaging lens having four lens elements
according to the present disclosure;
[0059] FIG. 47 depicts a chart of longitudinal spherical aberration
and other kinds of optical aberrations of an eleventh embodiment of
the optical imaging lens according to the present disclosure;
[0060] FIG. 48 depicts a table of optical data for each lens
element of the optical imaging lens of an eleventh embodiment of
the present disclosure;
[0061] FIG. 49 depicts a table of aspherical data of an eleventh
embodiment of the optical imaging lens according to the present
disclosure;
[0062] FIG. 50 depicts a cross-sectional view of a twelfth
embodiment of an optical imaging lens having four lens elements
according to the present disclosure;
[0063] FIG. 51 depicts a chart of longitudinal spherical aberration
and other kinds of optical aberrations of a twelfth embodiment of
the optical imaging lens according to the present disclosure;
[0064] FIG. 52 depicts a table of optical data for each lens
element of the optical imaging lens of a twelfth embodiment of the
present disclosure;
[0065] FIG. 53 depicts a table of aspherical data of a twelfth
embodiment of the optical imaging lens according to the present
disclosure;
[0066] FIG. 54 depicts a cross-sectional view of a thirteenth
embodiment of an optical imaging lens having four lens elements
according to the present disclosure;
[0067] FIG. 55 depicts a chart of longitudinal spherical aberration
and other kinds of optical aberrations of a thirteenth embodiment
of the optical imaging lens according to the present
disclosure;
[0068] FIG. 56 depicts a table of optical data for each lens
element of the optical imaging lens of a thirteenth embodiment of
the present disclosure;
[0069] FIG. 57 depicts a table of aspherical data of a thirteenth
embodiment of the optical imaging lens according to the present
disclosure;
[0070] FIGS. 58A and 58B are tables for the values of EFL, TL, BFL,
ALT, Gaa, TTL, TTL/(T2+G34), G12/T2, TTL/G12, ALT/(G12+G34),
TTL/(G12+G34), ALT/G12, (T2+T3)/G34, (G12+T3)/T2, Gaa/T2,
TL/(G12+G34), (G12+G34)/T2, T3/G34, (T2+G23)/G34, ALT/G34, TTL/G34,
TL/G34, (T2+T1)/G34, (T4+T2)/G34, EFL/G34 and (T4+T3)/G34 of the
first to thirteenth example embodiments.
DETAILED DESCRIPTION
[0071] For a more complete understanding of the present disclosure
and its advantages, reference is now made to the following
description taken in conjunction with the accompanying drawings, in
which like reference numbers indicate like features. Persons having
ordinary skill in the art will understand other varieties for
implementing example embodiments, including those described herein.
The drawings are not limited to specific scale and similar
reference numbers are used for representing similar elements. As
used in the disclosures and the appended claims, the terms "example
embodiment," "exemplary embodiment," and "present embodiment" do
not necessarily refer to a single embodiment, although it may, and
various example embodiments may be readily combined and
interchanged, without departing from the scope or spirit of the
present disclosure. Furthermore, the terminology as used herein is
for the purpose of describing example embodiments only and is not
intended to be a limitation of the disclosure. In this respect, as
used herein, the term "in" may include "in" and "on", and the terms
"a", "an" and "the" may include singular and plural references.
Furthermore, as used herein, the term "by" may also mean "from",
depending on the context. Furthermore, as used herein, the term
"if" may also mean "when" or "upon", depending on the context.
Furthermore, as used herein, the words "and/or" may refer to and
encompass any and all possible combinations of one or more of the
associated listed items.
[0072] In the present specification, the description "a lens
element having positive refracting power (or negative refracting
power)" means that the paraxial refracting power of the lens
element in Gaussian optics is positive (or negative). The
description "An object-side (or image-side) surface of a lens
element" may include a specific region of that surface of the lens
element where imaging rays are capable of passing through that
region, namely the clear aperture of the surface. The
aforementioned imaging rays can be classified into two types, chief
ray Lc and marginal ray Lm. Taking a lens element depicted in FIG.
1 as an example, the lens element may be rotationally symmetric,
where the optical axis I is the axis of symmetry. The region A of
the lens element is defined as "a part in a vicinity of the optical
axis", and the region C of the lens element is defined as "a part
in a vicinity of a periphery of the lens element". Besides, the
lens element may also have an extending part E extended radially
and outwardly from the region C, namely the part outside of the
clear aperture of the lens element. The extending part E may be
used for physically assembling the lens element into an optical
imaging lens system. Under normal circumstances, the imaging rays
would not pass through the extending part E because those imaging
rays only pass through the clear aperture. The structures and
shapes of the aforementioned extending part E are only examples for
technical explanation, the structures and shapes of lens elements
should not be limited to these examples. Note that the extending
parts of the lens element surfaces depicted in the following
embodiments are partially omitted.
[0073] The following criteria are provided for determining the
shapes and the parts of lens element surfaces set forth in the
present specification. These criteria mainly determine the
boundaries of parts under various circumstances including the part
in a vicinity of the optical axis, the part in a vicinity of a
periphery of a lens element surface, and other types of lens
element surfaces such as those having multiple parts.
[0074] FIG. 1 depicts a radial cross-sectional view of a lens
element. Before determining boundaries of those aforesaid parts,
two referential points should be defined first, the central point
and the transition point. The central point of a surface of a lens
element is a point of intersection of that surface and the optical
axis. The transition point is a point on a surface of a lens
element, where the tangent line of that point is perpendicular to
the optical axis. Additionally, if multiple transition points
appear on one single surface, then these transition points are
sequentially named along the radial direction of the surface with
numbers starting from the first transition point. For instance, the
first transition point (closest one to the optical axis), the
second transition point, and the Nth transition point (farthest one
to the optical axis within the scope of the clear aperture of the
surface). The part of a surface of the lens element between the
central point and the first transition point is defined as the part
in a vicinity of the optical axis. The part located radially
outside of the Nth transition point (but still within the scope of
the clear aperture) is defined as the part in a vicinity of a
periphery of the lens element. In some embodiments, there are other
parts existing between the part in a vicinity of the optical axis
and the part in a vicinity of a periphery of the lens element; the
numbers of parts depend on the numbers of the transition point(s).
In addition, the radius of the clear aperture (or a so-called
effective radius) of a surface is defined as the radial distance
from the optical axis I to a point of intersection of the marginal
ray Lm and the surface of the lens element.
[0075] Referring to FIG. 2, determining the shape of a part is
convex or concave depends on whether a collimated ray passing
through that part converges or diverges. That is, while applying a
collimated ray to a part to be determined in terms of shape, the
collimated ray passing through that part will be bended and the ray
itself or its extension line will eventually meet the optical axis.
The shape of that part can be determined by whether the ray or its
extension line meets (intersects) the optical axis (focal point) at
the object-side or image-side. For instance, if the ray itself
intersects the optical axis at the image side of the lens element
after passing through a part, i.e. the focal point of this ray is
at the image side (see point R in FIG. 2), the part will be
determined as having a convex shape. On the contrary, if the ray
diverges after passing through a part, the extension line of the
ray intersects the optical axis at the object side of the lens
element, i.e. the focal point of the ray is at the object side (see
point M in FIG. 2), that part will be determined as having a
concave shape. Therefore, referring to FIG. 2, the part between the
central point and the first transition point may have a convex
shape, the part located radially outside of the first transition
point may have a concave shape, and the first transition point is
the point where the part having a convex shape changes to the part
having a concave shape, namely the border of two adjacent parts.
Alternatively, there is another method to determine whether a part
in a vicinity of the optical axis may have a convex or concave
shape by referring to the sign of an "R" value, which is the
(paraxial) radius of curvature of a lens surface. The R value may
be used in conventional optical design software such as Zemax and
CodeV. The R value usually appears in the lens data sheet in the
software. For an object-side surface, positive R means that the
object-side surface is convex, and negative R means that the
object-side surface is concave. Conversely, for an image-side
surface, positive R means that the image-side surface is concave,
and negative R means that the image-side surface is convex. The
result found by using this method should be consistent as by using
the other way mentioned above, which determines surface shapes by
referring to whether the focal point of a collimated ray is at the
object side or the image side.
[0076] For none transition point cases, the part in a vicinity of
the optical axis may be defined as the part between 0-50% of the
effective radius (radius of the clear aperture) of the surface,
whereas the part in a vicinity of a periphery of the lens element
may be defined as the part between 50-100% of effective radius
(radius of the clear aperture) of the surface.
[0077] Referring to the first example depicted in FIG. 3, only one
transition point, namely a first transition point, appears within
the clear aperture of the image-side surface of the lens element.
Part I may be a part in a vicinity of the optical axis, and part II
may be a part in a vicinity of a periphery of the lens element. The
part in a vicinity of the optical axis may be determined as having
a concave surface due to the R value at the image-side surface of
the lens element is positive. The shape of the part in a vicinity
of a periphery of the lens element may be different from that of
the radially inner adjacent part, i.e. the shape of the part in a
vicinity of a periphery of the lens element may be different from
the shape of the part in a vicinity of the optical axis; the part
in a vicinity of a periphery of the lens element may have a convex
shape.
[0078] Referring to the second example depicted in FIG. 4, a first
transition point and a second transition point may exist on the
object-side surface (within the clear aperture) of a lens element.
In which part I may be the part in a vicinity of the optical axis,
and part III may be the part in a vicinity of a periphery of the
lens element. The part in a vicinity of the optical axis may have a
convex shape because the R value at the object-side surface of the
lens element may be positive. The part in a vicinity of a periphery
of the lens element (part III) may have a convex shape. What is
more, there may be another part having a concave shape existing
between the first and second transition point (part II).
[0079] Referring to a third example depicted in FIG. 5, no
transition point may exist on the object-side surface of the lens
element. In this case, the part between 0-50% of the effective
radius (radius of the clear aperture) may be determined as the part
in a vicinity of the optical axis, and the part between 50-100% of
the effective radius may be determined as the part in a vicinity of
a periphery of the lens element. The part in a vicinity of the
optical axis of the object-side surface of the lens element may be
determined as having a convex shape due to its positive R value,
and the part in a vicinity of a periphery of the lens element may
be determined as having a convex shape as well.
[0080] In some embodiments, the optical imaging lens may further
comprise an aperture stop positioned between the object and the
first lens element, two adjacent lens elements or the fourth lens
element and the image plane, such as glare stop or field stop,
which may provide a reduction in stray light that is favorable for
improving image quality.
[0081] In some embodiments, in the optical imaging lens of the
present disclosure, the aperture stop can be positioned between the
object and the first lens element as a front aperture stop or
between the first lens element and the image plane as a middle
aperture stop. If the aperture stop is the front aperture stop, a
longer distance between the exit pupil of the optical imaging lens
for imaging pickup and the image plane may provide the telecentric
effect and may improve the efficiency of receiving images by the
image sensor, which may comprise a CCD or CMOS image sensor. If the
aperture stop is a middle aperture stop, the view angle of the
optical imaging lens may be increased, such that the optical
imaging lens for imaging pickup has the advantage of a wide-angle
lens.
[0082] In the specification, parameters used herein may
include:
TABLE-US-00001 Parameter Definition TA The distance between the
aperture stop and the object-side surface of the adjacent lens
element along the optical axis T1 The central thickness of the
first lens element along the optical axis G12 The distance between
the image-side surface of the first lens element and the
object-side surface of the second lens element along the optical
axis/The air gap between the first lens element and the second lens
element along the optical axis T2 The central thickness of the
second lens element along the optical axis G23 The air gap between
the second lens element and the third lens element along the
optical axis T3 The central thickness of the third lens element
along the optical axis G34 The air gap between the third lens
element and the fourth lens element along the optical axis T4 The
central thickness of the fourth lens element along the optical axis
G4C The distance between the image-side surface of the forth lens
element and the object-side surface of the cover glass along the
optical axis TC The central thickness of the cover glass along the
optical axis GCP The distance between the image-side surface of the
cover glass and an image plane along the optical axis f1 The
focusing length of the first lens element f2 The focusing length of
the second lens element f3 The focusing length of the third lens
element f4 The focusing length of the fourth lens element n1 The
refracting index of the first lens element n2 The refracting index
of the second lens element n3 The refracting index of the third
lens element n4 The refracting index of the fourth lens element v1
The Abbe number of the first lens element v2 The Abbe number of the
second lens element v3 The Abbe number of the third lens element v4
The Abbe number of the fourth lens element HFOV Half Field of View
of the optical imaging lens Fno F-number of the optical imaging
lens EFL The effective focal length of the optical imaging lens TTL
The distance between the object-side surface of the first lens
element and an image plane along the optical axis/The length of the
optical image lens ALT The sum of the central thicknesses of all
lens elements Gaa The sum of all air gaps between all lens elements
along the optical axis BFL The back focal length of the optical
imaging lens/The distance from the image-side surface of the last
lens element to the image plane along the optical axis TL The
distance from the object-side surface of the first lens element to
the image-side surface of the lens element adjacent to the image
plane along the optical axis
[0083] In the present disclosure, various examples of optical
imaging lenses are provided, including examples in which the
optical imaging lens is a prime lens. Example embodiments of
optical imaging lenses may comprise, sequentially from an object
side to an image side along an optical axis, a first, second, third
and fourth lens elements and a cover glass, in which each of said
lens elements has an object-side surface facing toward the object
side and an image-side surface facing toward the image side. The
optical imaging lens of the present disclosure achieves good
optical characteristics and provides a shortened length due to the
design characteristics of each lens element.
[0084] According to some embodiments of the optical imaging lens of
the present disclosure, the object-side surface of the first lens
element may comprise a convex portion in a vicinity of the optical
axis; the image-side surface of the first lens element may comprise
a concave portion in a vicinity of a periphery of the first lens
element; the second lens element may have positive refracting
power; the image-side surface of the second lens element may
comprise a convex portion in a vicinity of the optical axis; the
object-side surface of the third lens element may comprise a convex
portion in a vicinity of the optical axis; the object-side surface
of the fourth lens element may comprise a concave portion in a
vicinity of a periphery of the fourth lens element; the image-side
surface of the fourth lens element may comprise a convex portion in
a vicinity of a periphery of the fourth lens element; and the
optical imaging lens may comprise no other lenses having refracting
power beyond the four lens elements. Further, a distance between
the object-side surface of the first lens element and an image
plane along the optical axis is represented by TTL, a central
thickness of the second lens element along the optical axis is
represented by T2, an air gap between the third lens element and
the fourth lens element along the optical axis is represented by
G34, and TTL, T2 and G34 could be controlled to satisfy the
equation as follows:
TTL/(T2+G34).ltoreq.4.5 Equation (1).
[0085] The optical imaging lens may include variations of any of
the above mentioned characteristics, and the system including it
may vary one or more lens elements. In addition, the system may
include variations of additional optical features as well as
variations of the optical lens length of the optical imaging lens.
For example, the object-side surface of the first lens element
comprising a convex portion in a vicinity of the optical axis and
the image-side surface of the first lens element comprising a
concave portion in a vicinity of a periphery of the first lens
element combined with the second lens element having positive
refracting power may favorable to gather light in large angle; the
image-side surface of the second lens element comprising a convex
portion in a vicinity of the optical axis combined with the
object-side surface of the third lens element may comprising a
convex portion in a vicinity of the optical axis may favorable to
gather light from the first lens element; and the object-side
surface of the fourth lens element comprising a concave portion in
a vicinity of a periphery of the fourth lens element and the
image-side surface of the fourth lens element comprising a convex
portion in a vicinity of a periphery of the fourth lens element may
favorable to correct aberration derived from the three lens
elements front of the fourth lens element. The above mentioned
designs may effectively eliminate aberrations, reduce the length of
the optical lens, enhance imaging quality, and enlarge the field of
view.
[0086] Properly decreasing the thicknesses of the lens elements as
well as the air gaps between the lens elements serves to shorten
the length of the optical imaging lens and enlarge the field of
view, which raises image quality. In this manner, the thicknesses
of the lens elements and the air gaps between the lens elements may
be adjusted to satisfy any one of equations described below, to
result in arrangements that overcome the difficulties of providing
improved imaging quality while overcoming the previously described
difficulties related to assembling the optical lens system:
TTL/(T2+G34).ltoreq.4.5 Equation (1);
G12/T2.gtoreq.1.3 Equation (2);
TTL/G12.ltoreq.5.4 Equation (3);
ALT/(G12+G34).ltoreq.2 Equation (4);
TTL/(G12+G34).ltoreq.4 Equation (5);
ALT/G12.ltoreq.2.6 Equation (6);
(T2+T3)/G34.ltoreq.5 Equation (7);
(G12+T3)/T2.gtoreq.2.3 Equation (8);
Gaa/T2.ltoreq.2.2 Equation (9);
TL/(G12+G34).ltoreq.3.2 Equation (10);
(G12+G34)/T2.ltoreq.1.9 Equation (11);
T3/G34.ltoreq.2.5 Equation (12);
(T2+G23)/G34.ltoreq.3.5 Equation (13);
ALT/G34.ltoreq.6.9 Equation (14);
TTL/G34.ltoreq.13.7 Equation (15);
TL/G34.ltoreq.11 Equation (16);
(T2+T1)/G34.ltoreq.3.5 Equation (17);
(T4+T2)/G34.ltoreq.3.5 Equation (18); and
(T4+T3)/G34.ltoreq.3.2 Equation (20).
[0087] In some embodiments, the value of TTL/(T2+G34) may be
further restricted between 2.50 and 4.50. In some embodiments, the
value of G12/T2 may be further restricted between 1.30 and 4.00. In
some embodiments, the value of TTL/G12 may be further restricted
between 2.50 and 5.40. In some embodiments, the value of
ALT/(G12+G34) may be further restricted between 0.50 and 2.00. In
some embodiments, the value of TTL/(G12+G34) may be further
restricted between 1.50 and 4.00. In some embodiments, the value of
ALT/G12 may be further restricted between 0.50 and 2.60. In some
embodiments, the value of (T2+T3)/G34 may be further restricted
between 1.00 and 5.00. In some embodiments, the value of
(G12+T3)/T2 may be further restricted between 2.30 and 5.00. In
some embodiments, the value of Gaa/T2 may be further restricted
between 2.20 and 5.50. In some embodiments, the value of
TL/(G12+G34) may be further restricted between 1.50 and 3.20. In
some embodiments, the value of (G12+G34)/T2 may be further
restricted between 1.90 and 5.00. In some embodiments, the value of
T3/G34 may be further restricted between 0.30 and 2.50. In some
embodiments, the value of (T2+G23)/G34 may be further restricted
between 0.50 and 3.50. In some embodiments, the value of ALT/G34
may be further restricted between 1.50 and 6.90. In some
embodiments, the value of TTL/G34 may be further restricted between
4.50 and 13.70. In some embodiments, the value of TL/G34 may be
further restricted between 4.00 and 11.00. In some embodiments, the
value of (T2+T1)/G34 may be further restricted between 0.50 and
3.50. In some embodiments, the value of (T4+T2)/G34 may be further
restricted between 0.50 and 3.50. In some embodiments, the value of
(T4+T3)/G34 may be further restricted between 0.50 and 3.20.
[0088] Shortening EFL may enlarge the field of view, so that EFL
should be shortened as small as possible. In view of the above,
satisfying the following equation may result in decreasing the
thickness of the system. Furthermore, the field of view may be
enlarged:
EFL/G34.ltoreq.2.6 Equation (19).
[0089] In some embodiments, the value of EFL/G34 may be further
restricted between 1.00 and 2.60. As a result of restricting
various values as described above, the imaging quality of the
optical imaging lens may be improved.
[0090] It should be appreciated that numerous variations are
possible when considering improvements to the design of an optical
system. When the optical imaging lens of the present disclosure
satisfies at least one of the equations described above, the length
of the optical lens may be reduced, the aperture stop may be
enlarged (F-number may be reduced), the field angle may be
enlarged, the imaging quality may be enhanced, or the assembly
yield may be upgraded. Such characteristics may advantageously
mitigate various drawbacks in other optical system designs.
[0091] When implementing example embodiments, more details about
the convex or concave surface could be incorporated for one
specific lens element or broadly for plural lens elements to
enhance the control for the system performance and/or resolution.
It is noted that the details listed here could be incorporated in
example embodiments if no inconsistency occurs.
[0092] Several exemplary embodiments and associated optical data
will now be provided to illustrate non-limiting examples of optical
imaging lens systems having good optical characteristics and a
shortened length. Reference is now made to FIGS. 6-9. FIG. 6
illustrates an example cross-sectional view of an optical imaging
lens 1 having four lens elements according to a first example
embodiment. FIG. 7 shows example charts of longitudinal spherical
aberration and other kinds of optical aberrations of the optical
imaging lens 1 according to the first example embodiment. FIG. 8
illustrates an example table of optical data of each lens element
of the optical imaging lens 1 according to the first example
embodiment. FIG. 9 depicts an example table of aspherical data of
the optical imaging lens 1 according to the first example
embodiment.
[0093] As shown in FIG. 6, the optical imaging lens 1 of the
present embodiment may comprise, in order from an object side A1 to
an image side A2 along an optical axis, a first lens element 110, a
second lens element 120, an aperture stop 100, a third lens element
130 and a fourth lens element 140. A cover glass 150 and an image
plane 160 of an image sensor (not shown) are positioned at the
image side A2 of the optical imaging lens 1. Each of the first,
second, third, fourth lens elements 110, 120, 130, 140 and the
cover glass 150 may comprise an object-side surface
111/121/131/141/151 facing toward the object side A1 and an
image-side surface 112/122/132/142/152 facing toward the image side
A2.
[0094] Exemplary embodiments of each lens element of the optical
imaging lens 1 will now be described with reference to the
drawings.
[0095] An example embodiment of the first lens element 110 may have
negative refracting power. The object-side surface 111 may comprise
a convex portion 1111 in a vicinity of an optical axis and a convex
portion 1112 in a vicinity of a periphery of the first lens element
110. The image-side surface 112 may comprise a concave portion 1121
in a vicinity of the optical axis and a concave portion 1122 in a
vicinity of a periphery of the first lens element 110. The
object-side surface 111 may be spherical surface and the image-side
surface 112 may be aspherical surface. The material of the first
lens element 110 may be plastic.
[0096] An example embodiment of the second lens element 120 may
have positive refracting power. The object-side surface 121 may
comprise a concave portion 1211 in a vicinity of the optical axis
and a concave portion 1212 in a vicinity of a periphery of the
second lens element 120. The image-side surface 122 may comprise a
convex portion 1221 in a vicinity of the optical axis and a convex
portion 1222 in a vicinity of a periphery of the second lens
element 120. The object-side surface 121 and the image-side surface
122 may be aspherical surfaces. The material of the second lens
element 120 may be plastic.
[0097] An example embodiment of the third lens element 130 may have
positive refracting power. The object-side surface 131 may comprise
a convex portion 1311 in a vicinity of the optical axis and a
convex portion 1312 in a vicinity of a periphery of the third lens
element 130. The image-side surface 132 may comprise a convex
portion 1321 in a vicinity of the optical axis and a convex portion
1322 in a vicinity of a periphery of the third lens element 130.
The object-side surface 131 and the image-side surface 132 may be
spherical surfaces. The material of the third lens element 130 may
be glass.
[0098] An example embodiment of the fourth lens element 140 may
have negative refracting power. The object-side surface 141 may
comprise a concave portion 1411 in a vicinity of the optical axis
and a concave portion 1412 in a vicinity of a periphery of the
fourth lens element 140. The image-side surface 142 may comprise a
concave portion 1421 in a vicinity of the optical axis and a convex
portion 1422 in a vicinity of a periphery of the fourth lens
element 140. The object-side surface 141 and the image-side surface
142 may be aspherical surfaces. The material of the fourth lens
element 140 may be plastic.
[0099] In example embodiments, air gaps exist between the lens
elements 110, 120, 130, 140, the cover glass 150 and the image
plane 160 of the image sensor. For example, FIG. 6 illustrates the
air gap d1 existing between the first lens element 110 and the
second lens element 120, the air gap d2 existing between the second
lens element 120 and the third lens element 130, the air gap d3
existing between the third lens element 130 and the fourth lens
element 140, the air gap d4 existing between the fourth lens
element 140 and the cover glass 150, and the air gap d5 existing
between the cover glass 150 and the image plane 160. However, in
other embodiments, any of the aforesaid air gaps may or may not
exist. For example, the profiles of opposite surfaces of any two
adjacent lens elements may correspond to each other, and in such
situation, the air gap may not exist. The air gap d1 is denoted by
G12, the air gap d2 is denoted by G23, the air gap d3 is denoted by
G34, the air gap d4 is denoted by G4C, the air gap d5 is denoted by
GCP, and the sum of d1, d2 and d3 is denoted by Gaa.
[0100] FIG. 8 depicts the optical characteristics of each lens
elements in the optical imaging lens 1 of the present embodiment.
The aspherical surfaces including the image-side surface 112 of the
first lens element 110, the object-side surface 121 and the
image-side surface 122 of the second lens element 120, and the
object-side surface 141 and the image-side surface 142 of the
fourth lens element 140 are all defined by the following aspherical
formula (1):
Z ( Y ) = Y 2 R / ( 1 + 1 - ( 1 + K ) Y 2 R 2 ) + i = 1 n a 2 i
.times. Y 2 i formula ( 1 ) ##EQU00001##
[0101] wherein,
[0102] R represents the radius of curvature of the surface of the
lens element;
[0103] Z represents the depth of the aspherical surface (the
perpendicular distance between the point of the aspherical surface
at a distance Y from the optical axis and the tangent plane of the
vertex on the optical axis of the aspherical surface);
[0104] Y represents the perpendicular distance between the point of
the aspherical surface and the optical axis;
[0105] K represents a conic constant;
[0106] a.sub.2i represents an aspherical coefficient of 2i.sup.th
level.
[0107] The values of each aspherical parameter are shown in FIG.
9.
[0108] FIG. 7 part (a) shows the longitudinal spherical aberration,
wherein the horizontal axis of FIG. 7 part (a) defines the focus,
and the vertical axis of FIG. 7 part (a) defines the field of view.
FIG. 7 part (b) shows the astigmatism aberration in the sagittal
direction, wherein the horizontal axis of FIG. 7 part (b) defines
the focus, and the vertical axis of FIG. 7 part (b) defines the
image height. FIG. 7 part (c) shows the astigmatism aberration in
the tangential direction, wherein the horizontal axis of FIG. 7
part (c) defines the focus, and the vertical axis of FIG. 7 part
(c) defines the image height. FIG. 7 part (d) shows the variation
of the distortion aberration, wherein the horizontal axis of FIG. 7
part (d) defines the percentage, and the vertical axis of FIG. 7
part (d) defines the image height. The three curves with different
wavelengths (830 nm, 850 nm and 870 nm) represent that off-axis
light with respect to these wavelengths may be focused around an
image point. From the vertical deviation of each curve shown in
FIG. 7 part (a), the offset of the off-axis light relative to the
image point may be within about .+-.0.016 mm. Therefore, the first
embodiment may improve the longitudinal spherical aberration with
respect to different wavelengths. Referring to FIG. 7 part (b), the
focus variation with respect to the three different wavelengths
(830 nm, 850 nm and 870 nm) in the whole field may fall within
about .+-.0.016 mm. Referring to FIG. 7 part (c), the focus
variation with respect to the three different wavelengths (830 nm,
850 nm and 870 nm) in the whole field may fall within about
.+-.0.012 mm. Referring to FIG. 7 part (d), the horizontal axis of
FIG. 7 part (d), the variation of the distortion aberration may be
within about .+-.70%.
[0109] Please refer to FIG. 58A for the values of T1, G12, T2, G23,
T3, G34, T4, EFL, TL, BFL, ALT, Gaa, TTL, TTL/(T2+G34), G12/T2,
TTL/G12, ALT/(G12+G34), TTL/(G12+G34), ALT/G12, (T2+T3)/G34,
(G12+T3)/T2, Gaa/T2, TL/(G12+G34), (G12+G34)/T2, T3/G34,
(T2+G23)/G34, ALT/G34, TTL/G34, TL/G34, (T2+T1)/G34, (T4+T2)/G34,
EFL/G34 and (T4+T3)/G34 of the present embodiment.
[0110] The distance from the object-side surface 111 of the first
lens element 110 to the image plane 160 along the optical axis may
be about 13.303 mm, EFL may be about 1.832 mm, HFOV may be about
73.043 degrees, the image height may be about 2.124 mm, and Fno may
be about 2.745. In accordance with these values, the present
embodiment may provide an optical imaging lens having a shortened
length, and may be capable of accommodating a slim product profile
that also renders improved optical performance.
[0111] Reference is now made to FIGS. 10-13. FIG. 10 illustrates an
example cross-sectional view of an optical imaging lens 2 having
four lens elements according to a second example embodiment. FIG.
11 shows example charts of longitudinal spherical aberration and
other kinds of optical aberrations of the optical imaging lens 2
according to the second example embodiment. FIG. 12 shows an
example table of optical data of each lens element of the optical
imaging lens 2 according to the second example embodiment. FIG. 13
shows an example table of aspherical data of the optical imaging
lens 2 according to the second example embodiment. The reference
numbers labeled in the present embodiment are similar to those in
the first embodiment for the similar elements, but here the
reference numbers are initialed with 2, for example, reference
number 231 for labeling the object-side surface of the third lens
element 230, reference number 232 for labeling the image-side
surface of the third lens element 230, etc.
[0112] As shown in FIG. 10, the optical imaging lens 2 of the
present embodiment, in an order from an object side A1 to an image
side A2 along an optical axis, may comprise a first lens element
210, a second lens element 220, an aperture stop 200, a third lens
element 230 and a fourth lens element 240.
[0113] The arrangement of the convex or concave surface structures,
including the object-side surfaces 211, 221, 231, and 241 and the
image-side surfaces 212, 222, 232, and 242 are generally similar to
the optical imaging lens 1. The differences between the optical
imaging lens 1 and the optical imaging lens 2 may include a radius
of curvature, a thickness, aspherical data, and an effective focal
length of each lens element.
[0114] Here, for clearly showing the drawings of the present
embodiment, only the surface shapes which are different from that
in the first embodiment are labeled. Please refer to FIG. 12 for
the optical characteristics of each lens element in the optical
imaging lens 2 of the present embodiment.
[0115] From the vertical deviation of each curve shown in FIG. 11
part (a), the offset of the off-axis light relative to the image
point may be within about .+-.0.014 mm. Referring to FIG. 11 part
(b), the focus variation with respect to the three different
wavelengths (830 nm, 850 nm and 870 nm) in the whole field may fall
within about .+-.0.016 mm. Referring to FIG. 11 part (c), the focus
variation with respect to the three different wavelengths (830 nm,
850 nm and 870 nm) in the whole field may fall within about
.+-.0.01 mm. Referring to FIG. 11 part (d), the variation of the
distortion aberration of the optical imaging lens 2 may be within
about .+-.70%.
[0116] Please refer to FIG. 58A for the values of T1, G12, T2, G23,
T3, G34, T4, EFL, TL, BFL, ALT, Gaa, TTL, TTL/(T2+G34), G12/T2,
TTL/G12, ALT/(G12+G34), TTL/(G12+G34), ALT/G12, (T2+T3)/G34,
(G12+T3)/T2, Gaa/T2, TL/(G12+G34), (G12+G34)/T2, T3/G34,
(T2+G23)/G34, ALT/G34, TTL/G34, TL/G34, (T2+T1)/G34, (T4+T2)/G34,
EFL/G34 and (T4+T3)/G34 of the present embodiment.
[0117] The distance from the object-side surface 211 of the first
lens element 210 to the image plane 260 along the optical axis may
be about 9.02 mm, EFL may be about 1.859 mm, the image height may
be about 2.109 mm, HFOV may be about 73.043 degrees, and Fno may be
about 2.742.
[0118] In comparison with the first embodiment, the longitudinal
spherical aberration, the astigmatism aberration in the tangential
direction, TTL and Fno in the second embodiment may be smaller.
Further, the second embodiment may be manufactured more easily and
the yield rate may be higher.
[0119] Reference is now made to FIGS. 14-17. FIG. 14 illustrates an
example cross-sectional view of an optical imaging lens 3 having
four lens elements according to a third example embodiment. FIG. 15
shows example charts of longitudinal spherical aberration and other
kinds of optical aberrations of the optical imaging lens 3
according to the third example embodiment. FIG. 16 shows an example
table of optical data of each lens element of the optical imaging
lens 3 according to the third example embodiment. FIG. 17 shows an
example table of aspherical data of the optical imaging lens 3
according to the third example embodiment. The reference numbers
labeled in the present embodiment are similar to those in the first
embodiment for the similar elements, but here the reference numbers
are initialed with 3, for example, reference number 331 for
labeling the object-side surface of the third lens element 330,
reference number 332 for labeling the image-side surface of the
third lens element 330, etc.
[0120] As shown in FIG. 14, the optical imaging lens 3 of the
present embodiment, in an order from an object side A1 to an image
side A2 along an optical axis, may comprise a first lens element
310, a second lens element 320, an aperture stop 300, a third lens
element 330 and a fourth lens element 340.
[0121] The arrangement of the convex or concave surface structures,
including the object-side surfaces 311, 321, 331, and 341 and the
image-side surfaces 312, 322, 332, and 342 are generally similar to
the optical imaging lens 1. The differences between the optical
imaging lens 1 and the optical imaging lens 3 may include a radius
of curvature, a thickness, aspherical data, and an effective focal
length of each lens element.
[0122] Here, for clearly showing the drawings of the present
embodiment, only the surface shapes which are different from that
in the first embodiment are labeled. Please refer to FIG. 16 for
the optical characteristics of each lens element in the optical
imaging lens 3 of the present embodiment.
[0123] From the vertical deviation of each curve shown in FIG. 15
part (a), the offset of the off-axis light relative to the image
point may be within about .+-.0.008 mm. Referring to FIG. 15 part
(b), the focus variation with respect to the three different
wavelengths (830 nm, 850 nm and 870 nm) in the whole field may fall
within about .+-.0.02 mm. Referring to FIG. 15 part (c), the focus
variation with respect to the three different wavelengths (830 nm,
850 nm and 870 nm) in the whole field may fall within about
.+-.0.015 mm. Referring to FIG. 15 part (d), the variation of the
distortion aberration of the optical imaging lens 3 may be within
about .+-.70%.
[0124] Please refer to FIG. 58A for the values of T1, G12, T2, G23,
T3, G34, T4, EFL, TL, BFL, ALT, Gaa, TTL, TTL/(T2+G34), G12/T2,
TTL/G12, ALT/(G12+G34), TTL/(G12+G34), ALT/G12, (T2+T3)/G34,
(G12+T3)/T2, Gaa/T2, TL/(G12+G34), (G12+G34)/T2, T3/G34,
(T2+G23)/G34, ALT/G34, TTL/G34, TL/G34, (T2+T1)/G34, (T4+T2)/G34,
EFL/G34 and (T4+T3)/G34 of the present embodiment.
[0125] The distance from the object-side surface 311 of the first
lens element 310 to the image plane 360 along the optical axis may
be about 9.754 mm, EFL may be about 1.867 mm, the image height may
be about 2.109 mm, HFOV may be about 73.043 degrees, and Fno may be
about 2.756.
[0126] In comparison with the first embodiment, the the
longitudinal spherical aberration and TTL of the third embodiment
may be smaller. Furthermore, the third embodiment of the optical
imaging lens may be manufactured more easily and its yield rate may
be higher.
[0127] Reference is now made to FIGS. 18-21. FIG. 18 illustrates an
example cross-sectional view of an optical imaging lens 4 having
four lens elements according to a fourth example embodiment. FIG.
19 shows example charts of longitudinal spherical aberration and
other kinds of optical aberrations of the optical imaging lens 4
according to the fourth embodiment. FIG. 20 shows an example table
of optical data of each lens element of the optical imaging lens 4
according to the fourth example embodiment. FIG. 21 shows an
example table of aspherical data of the optical imaging lens 4
according to the fourth example embodiment. The reference numbers
labeled in the present embodiment are similar to those in the first
embodiment for the similar elements, but here the reference numbers
are initialed with 4, for example, reference number 431 for
labeling the object-side surface of the third lens element 430,
reference number 432 for labeling the image-side surface of the
third lens element 430, etc.
[0128] As shown in FIG. 18, the optical imaging lens 4 of the
present embodiment, in an order from an object side A1 to an image
side A2 along an optical axis, may comprise a first lens element
410, a second lens element 420, an aperture stop 400, a third lens
element 430 and a fourth lens element 440.
[0129] The arrangement of the convex or concave surface structures,
including the object-side surfaces 411, 421, 431, and 441 and the
image-side surfaces 412, 422, 432, and 442 are generally similar to
the optical imaging lens 1. The differences between the optical
imaging lens 1 and the optical imaging lens 4 may include a radius
of curvature, a thickness, aspherical data, and an effective focal
length of each lens element.
[0130] Here, for clearly showing the drawings of the present
embodiment, only the surface shapes which are different from that
in the first embodiment are labeled. Please refer to FIG. 20 for
the optical characteristics of each lens elements in the optical
imaging lens 4 of the present embodiment.
[0131] From the vertical deviation of each curve shown in FIG. 19
part (a), the offset of the off-axis light relative to the image
point may be within about .+-.0.006 mm. Referring to FIG. 19 part
(b), the focus variation with respect to the three different
wavelengths (830 nm, 850 nm and 870 nm) in the whole field may fall
within about .+-.0.016 mm. Referring to FIG. 19 part (c), the focus
variation with respect to the three different wavelengths (830 nm,
850 nm and 870 nm) in the whole field may fall within about
.+-.0.012 mm. Referring to FIG. 19 part (d), the variation of the
distortion aberration of the optical imaging lens 4 may be within
about .+-.70%.
[0132] Please refer to FIG. 58A for the values of T1, G12, T2, G23,
T3, G34, T4, EFL, TL, BFL, ALT, Gaa, TTL, TTL/(T2+G34), G12/T2,
TTL/G12, ALT/(G12+G34), TTL/(G12+G34), ALT/G12, (T2+T3)/G34,
(G12+T3)/T2, Gaa/T2, TL/(G12+G34), (G12+G34)/T2, T3/G34,
(T2+G23)/G34, ALT/G34, TTL/G34, TL/G34, (T2+T1)/G34, (T4+T2)/G34,
EFL/G34 and (T4+T3)/G34 of the present embodiment.
[0133] The distance from the object-side surface 411 of the first
lens element 410 to the image plane 460 along the optical axis may
be about 10.895 mm, EFL may be about 1.865 mm, the image height may
be about 2.109 mm, HFOV may be about 73.030 degrees, and Fno may be
about 2.734.
[0134] Comparing with the first embodiment, the longitudinal
spherical aberration and Fno of the fourth embodiment may be
smaller, and TTL of the fourth embodiment may be shorter.
Furthermore, the fourth embodiment of the optical imaging lens may
be manufactured more easily and its yield rate may be higher.
[0135] Reference is now made to FIGS. 22-25. FIG. 22 illustrates an
example cross-sectional view of an optical imaging lens 5 having
four lens elements according to a fifth example embodiment. FIG. 23
shows example charts of longitudinal spherical aberration and other
kinds of optical aberrations of the optical imaging lens 5
according to the fifth embodiment. FIG. 24 shows an example table
of optical data of each lens element of the optical imaging lens 5
according to the fifth example embodiment. FIG. 25 shows an example
table of aspherical data of the optical imaging lens 5 according to
the fifth example embodiment. The reference numbers labeled in the
present embodiment are similar to those in the first embodiment for
the similar elements, but here the reference numbers are initialed
with 5, for example, reference number 531 for labeling the
object-side surface of the third lens element 530, reference number
532 for labeling the image-side surface of the third lens element
530, etc.
[0136] As shown in FIG. 22, the optical imaging lens 5 of the
present embodiment, in an order from an object side A1 to an image
side A2 along an optical axis, may comprise a first lens element
510, a second lens element 520, an aperture stop 500, a third lens
element 530 and a fourth lens element 540.
[0137] The arrangement of the convex or concave surface structures,
including the object-side surfaces 511, 431, and 541 and the
image-side surfaces 512, 522, 532, and 542 are generally similar to
the optical imaging lens 1. The differences between the optical
imaging lens 1 and the optical imaging lens 5 may include the
concave/convex shapes of the object-side surface 521, the radius of
curvature, the thickness, aspherical data, and the effective focal
length of each lens element. More specifically, the object-side
surface 521 may comprise a convex portion 5211 in a vicinity of the
optical axis and a convex portion 5212 in a vicinity of a periphery
of the second lens element 520.
[0138] Here, for clearly showing the drawings of the present
embodiment, only the surface shapes which are different from that
in the first embodiment are labeled. FIG. 24 depicts the optical
characteristics of each lens elements in the optical imaging lens 5
of the present embodiment.
[0139] From the vertical deviation of each curve shown in FIG. 23
part (a), the offset of the off-axis light relative to the image
point may be within about .+-.0.006 mm. Referring to FIG. 23 part
(b), the focus variation with respect to the three different
wavelengths (830 nm, 850 nm and 870 nm) in the whole field may fall
within about .+-.0.014 mm. Referring to FIG. 23 part (c), the focus
variation with respect to the three different wavelengths (830 nm,
850 nm and 870 nm) in the whole field may fall within about
.+-.0.008 mm. Referring to FIG. 23 part (d), the variation of the
distortion aberration of the optical imaging lens 5 may be within
about .+-.70%.
[0140] Please refer to FIG. 58A for the values of T1, G12, T2, G23,
T3, G34, T4, EFL, TL, BFL, ALT, Gaa, TTL, TTL/(T2+G34), G12/T2,
TTL/G12, ALT/(G12+G34), TTL/(G12+G34), ALT/G12, (T2+T3)/G34,
(G12+T3)/T2, Gaa/T2, TL/(G12+G34), (G12+G34)/T2, T3/G34,
(T2+G23)/G34, ALT/G34, TTL/G34, TL/G34, (T2+T1)/G34, (T4+T2)/G34,
EFL/G34 and (T4+T3)/G34 of the present embodiment.
[0141] The distance from the object-side surface 511 of the first
lens element 510 to the image plane 560 along the optical axis may
be about 7.647 mm, EFL may be about 1.721 mm, the image height may
be about 2.112 mm, HFOV may be about 73.027 degrees, and Fno may be
about 2.750.
[0142] In comparison with the first embodiment, the longitudinal
spherical aberration, the astigmatism aberration in the sagittal
and tangential directions, TTL and EFL of the fifth embodiment may
be smaller. Furthermore, the fifth embodiment of the optical
imaging lens may be manufactured more easily and the yield rate may
be higher.
[0143] Reference is now made to FIGS. 26-29. FIG. 26 illustrates an
example cross-sectional view of an optical imaging lens 6 having
four lens elements according to a sixth example embodiment. FIG. 27
shows example charts of longitudinal spherical aberration and other
kinds of optical aberrations of the optical imaging lens 6
according to the sixth embodiment. FIG. 28 shows an example table
of optical data of each lens element of the optical imaging lens 6
according to the sixth example embodiment. FIG. 29 shows an example
table of aspherical data of the optical imaging lens 6 according to
the sixth example embodiment. The reference numbers labeled in the
present embodiment are similar to those in the first embodiment for
the similar elements, but here the reference numbers are initialed
with 6, for example, reference number 631 for labeling the
object-side surface of the third lens element 630, reference number
632 for labeling the image-side surface of the third lens element
630, etc.
[0144] As shown in FIG. 26, the optical imaging lens 6 of the
present embodiment, in an order from an object side A1 to an image
side A2 along an optical axis, may comprise a first lens element
610, a second lens element 620, an aperture stop 600, a third lens
element 630 and a fourth lens element 640.
[0145] The arrangement of the convex or concave surface structures,
including the object-side surfaces 611, 621, 631 and 641 and the
image-side surfaces 612, 622, and 632 are generally similar to the
optical imaging lens 1. The differences between the optical imaging
lens 1 and the optical imaging lens 6 may include the
concave/convex shapes of the image-side surface 642, a radius of
curvature, a thickness, aspherical data, and an effective focal
length of each lens element. More specifically, the image-side
surface 642 may comprise a convex portion 6421 in a vicinity of the
optical axis.
[0146] Here, for clearly showing the drawings of the present
embodiment, only the surface shapes which are different from that
in the first embodiment are labeled. Please refer to FIG. 28 for
the optical characteristics of each lens elements in the optical
imaging lens 6 of the present embodiment.
[0147] From the vertical deviation of each curve shown in FIG. 27
part (a), the offset of the off-axis light relative to the image
point may be within about .+-.0.014 mm. Referring to FIG. 27 part
(b), the focus variation with respect to the three different
wavelengths (830 nm, 850 nm and 870 nm) in the whole field may fall
within about .+-.0.02 mm. Referring to FIG. 23 part (c), the focus
variation with respect to the three different wavelengths (830 nm,
850 nm and 870 nm) in the whole field may fall within about
.+-.0.02 mm. Referring to FIG. 27 part (d), the variation of the
distortion aberration of the optical imaging lens 6 may be within
about .+-.70%.
[0148] Please refer to FIG. 58A for the values of T1, G12, T2, G23,
T3, G34, T4, EFL, TL, BFL, ALT, Gaa, TTL, TTL/(T2+G34), G12/T2,
TTL/G12, ALT/(G12+G34), TTL/(G12+G34), ALT/G12, (T2+T3)/G34,
(G12+T3)/T2, Gaa/T2, TL/(G12+G34), (G12+G34)/T2, T3/G34,
(T2+G23)/G34, ALT/G34, TTL/G34, TL/G34, (T2+T1)/G34, (T4+T2)/G34,
EFL/G34 and (T4+T3)/G34 of the present embodiment.
[0149] The distance from the object-side surface 611 of the first
lens element 610 to the image plane 660 along the optical axis may
be about 13.355 mm, EFL may be about 1.953 mm, the image height may
be about 2.100 mm, HFOV may be about 73.049 degrees, and Fno may be
about 2.715.
[0150] In comparison with the first embodiment, the longitudinal
spherical aberration, Fno of the sixth embodiment may be smaller,
and HFOV of the sixth embodiment may be larger. Furthermore, the
sixth embodiment of the optical imaging lens may be manufactured
more easily and the yield rate may be higher.
[0151] Reference is now made to FIGS. 30-33. FIG. 30 illustrates an
example cross-sectional view of an optical imaging lens 7 having
four lens elements according to a seventh example embodiment. FIG.
31 shows example charts of longitudinal spherical aberration and
other kinds of optical aberrations of the optical imaging lens 7
according to the seventh embodiment. FIG. 32 shows an example table
of optical data of each lens element of the optical imaging lens 7
according to the seventh example embodiment. FIG. 33 shows an
example table of aspherical data of the optical imaging lens 7
according to the seventh example embodiment. The reference numbers
labeled in the present embodiment are similar to those in the first
embodiment for the similar elements, but here the reference numbers
are initialed with 7, for example, reference number 731 for
labeling the object-side surface of the third lens element 730,
reference number 732 for labeling the image-side surface of the
third lens element 730, etc.
[0152] As shown in FIG. 30, the optical imaging lens 7 of the
present embodiment, in an order from an object side A1 to an image
side A2 along an optical axis, may comprise a first lens element
710, a second lens element 720, an aperture stop 700, a third lens
element 730 and a fourth lens element 740.
[0153] The arrangement of the convex or concave surface structures,
including the object-side surfaces 711, 721, 731, and 741 and the
image-side surfaces 712, 722, 732, and 742 are generally similar to
the optical imaging lens 1. The differences between the optical
imaging lens 1 and the optical imaging lens 7 may include a radius
of curvature, a thickness, aspherical data, and an effective focal
length of each lens element.
[0154] Here, for clearly showing the drawings of the present
embodiment, only the surface shapes which are different from that
in the first embodiment are labeled. Please refer to FIG. 32 for
the optical characteristics of each lens elements in the optical
imaging lens 7 of the present embodiment.
[0155] From the vertical deviation of each curve shown in FIG. 31
part (a), the offset of the off-axis light relative to the image
point may be within .+-.0.006 mm. Referring to FIG. 31 part (b),
the focus variation with respect to the three different wavelengths
(830 nm, 850 nm and 870 nm) in the whole field falls within
.+-.0.01 mm. Referring to FIG. 31 part (c), the focus variation
with respect to the three different wavelengths (830 nm, 850 nm and
870 nm) in the whole field falls within .+-.0.02 mm. Referring to
FIG. 31 part (d), the variation of the distortion aberration of the
optical imaging lens 7 may be within .+-.70%.
[0156] Please refer to FIG. 58B for the values of T1, G12, T2, G23,
T3, G34, T4, EFL, TL, BFL, ALT, Gaa, TTL, TTL/(T2+G34), G12/T2,
TTL/G12, ALT/(G12+G34), TTL/(G12+G34), ALT/G12, (T2+T3)/G34,
(G12+T3)/T2, Gaa/T2, TL/(G12+G34), (G12+G34)/T2, T3/G34,
(T2+G23)/G34, ALT/G34, TTL/G34, TL/G34, (T2+T1)/G34, (T4+T2)/G34,
EFL/G34 and (T4+T3)/G34 of the present embodiment.
[0157] The distance from the object-side surface 711 of the first
lens element 710 to the image plane 760 along the optical axis may
be about 13.609 mm, EFL may be about 1.863 mm, the image height may
be about 2.111 mm, HFOV may be about 73.069 degrees, and Fno may be
about 2.716.
[0158] In comparison with the first embodiment, the longitudinal
spherical aberration and the astigmatism aberration in the sagittal
direction of the seventh embodiment may be smaller, Fno of the
seventh embodiment may be smaller, and HFOV of the seventh
embodiment may be larger. Furthermore, the seventh embodiment of
the optical imaging lens may be manufactured more easily and the
yield rate may be higher.
[0159] Reference is now made to FIGS. 34-37. FIG. 34 illustrates an
example cross-sectional view of an optical imaging lens 8 having
four lens elements according to an eighth example embodiment. FIG.
35 shows example charts of longitudinal spherical aberration and
other kinds of optical aberrations of the optical imaging lens 8
according to the eighth embodiment. FIG. 36 shows an example table
of optical data of each lens element of the optical imaging lens 8
according to the eighth example embodiment. FIG. 37 shows an
example table of aspherical data of the optical imaging lens 8
according to the eighth example embodiment. The reference numbers
labeled in the present embodiment are similar to those in the first
embodiment for the similar elements, but here the reference numbers
are initialed with 8, for example, reference number 831 for
labeling the object-side surface of the third lens element 830,
reference number 832 for labeling the image-side surface of the
third lens element 830, etc.
[0160] As shown in FIG. 34, the optical imaging lens 8 of the
present embodiment, in an order from an object side A1 to an image
side A2 along an optical axis, may comprise a first lens element
810, a second lens element 820, an aperture stop 800, a third lens
element 830 and a fourth lens element 840.
[0161] The arrangement of the convex or concave surface structures,
including the object-side surfaces 811, 821, 831, and 841 and the
image-side surfaces 812, 822, 832 and 842 are generally similar to
the optical imaging lens 1. The differences between the optical
imaging lens 1 and the optical imaging lens 8 may include a radius
of curvature, a thickness, aspherical data, and an effective focal
length of each lens element.
[0162] Here, for clearly showing the drawings of the present
embodiment, only the surface shapes which are different from that
in the first embodiment are labeled. Please refer to FIG. 36 for
the optical characteristics of each lens elements in the optical
imaging lens 8 of the present embodiment.
[0163] From the vertical deviation of each curve shown in FIG. 35
part (a), the offset of the off-axis light relative to the image
point may be within .+-.0.009 mm. Referring to FIG. 35 part (b),
the focus variation with respect to the three different wavelengths
(830 nm, 850 nm and 870 nm) in the whole field falls within
.+-.0.02 mm. Referring to FIG. 35 part (c), the focus variation
with respect to the three different wavelengths (830 nm, 850 nm and
870 nm) in the whole field falls within .+-.0.01 mm. Referring to
FIG. 35 part (d), the variation of the distortion aberration of the
optical imaging lens 8 may be within .+-.70%.
[0164] Please refer to FIG. 58B for the values of T1, G12, T2, G23,
T3, G34, T4, EFL, TL, BFL, ALT, Gaa, TTL, TTL/(T2+G34), G12/T2,
TTL/G12, ALT/(G12+G34), TTL/(G12+G34), ALT/G12, (T2+T3)/G34,
(G12+T3)/T2, Gaa/T2, TL/(G12+G34), (G12+G34)/T2, T3/G34,
(T2+G23)/G34, ALT/G34, TTL/G34, TL/G34, (T2+T1)/G34, (T4+T2)/G34,
EFL/G34 and (T4+T3)/G34 of the present embodiment.
[0165] The distance from the object-side surface 811 of the first
lens element 810 to the image plane 860 along the optical axis may
be about 13.645 mm, EFL may be about 1.852 mm, the image height may
be about 2.124 mm, HFOV may be about 73.047 degrees, and Fno may be
about 2.743.
[0166] In comparison with the first embodiment, the longitudinal
spherical aberration and the astigmatism aberration in the
tangential direction of the eighth embodiment may be smaller, HFOV
of the eighth embodiment may be greater, and Fno of the eighth
embodiment may be smaller. Further, the eighth embodiment of the
optical imaging lens may be manufactured more easily and the yield
rate may be higher.
[0167] Reference is now made to FIGS. 38-41. FIG. 38 illustrates an
example cross-sectional view of an optical imaging lens 9 having
four lens elements according to a ninth example embodiment. FIG. 39
shows example charts of longitudinal spherical aberration and other
kinds of optical aberrations of the optical imaging lens 9
according to the ninth embodiment. FIG. 40 shows an example table
of optical data of each lens element of the optical imaging lens 9
according to the ninth example embodiment. FIG. 41 shows an example
table of aspherical data of the optical imaging lens 9 according to
the ninth example embodiment. The reference numbers labeled in the
present embodiment are similar to those in the first embodiment for
the similar elements, but here the reference numbers are initialed
with 9, for example, reference number 931 for labeling the
object-side surface of the third lens element 930, reference number
932 for labeling the image-side surface of the third lens element
930, etc.
[0168] As shown in FIG. 38, the optical imaging lens 9 of the
present embodiment, in an order from an object side A1 to an image
side A2 along an optical axis, may comprise a first lens element
910, a second lens element 920, an aperture stop 900, a third lens
element 930 and a fourth lens element 940.
[0169] The arrangement of the convex or concave surface structures,
including the object-side surfaces 911, 921, 931, and 941 and the
image-side surfaces 912, 922, 932, and 942 are generally similar to
the optical imaging lens 1. The differences between the optical
imaging lens 1 and the optical imaging lens 9 may include a radius
of curvature, a thickness, aspherical data, and an effective focal
length of each lens element.
[0170] Here, for clearly showing the drawings of the present
embodiment, only the surface shapes which are different from that
in the first embodiment are labeled. Please refer to FIG. 40 for
the optical characteristics of each lens elements in the optical
imaging lens 9 of the present embodiment.
[0171] From the vertical deviation of each curve shown in FIG. 39
part (a), the offset of the off-axis light relative to the image
point may be within about .+-.0.016 mm. Referring to FIG. 39 part
(b), the focus variation with respect to the three different
wavelengths (830 nm, 850 nm and 870 nm) in the whole field falls
within .+-.0.02 mm. Referring to FIG. 39 part (c), the focus
variation with respect to the three different wavelengths (830 nm,
850 nm and 870 nm) in the whole field falls within .+-.0.06 mm.
Referring to FIG. 39 part (d), the variation of the distortion
aberration of the optical imaging lens 9 may be within .+-.70%.
[0172] Please refer to FIG. 58B for the values of T1, G12, T2, G23,
T3, G34, T4, EFL, TL, BFL, ALT, Gaa, TTL, TTL/(T2+G34), G12/T2,
TTL/G12, ALT/(G12+G34), TTL/(G12+G34), ALT/G12, (T2+T3)/G34,
(G12+T3)/T2, Gaa/T2, TL/(G12+G34), (G12+G34)/T2, T3/G34,
(T2+G23)/G34, ALT/G34, TTL/G34, TL/G34, (T2+T1)/G34, (T4+T2)/G34,
EFL/G34 and (T4+T3)/G34 of the present embodiment.
[0173] The distance from the object-side surface 911 of the first
lens element 910 to the image plane 960 along the optical axis may
be about 10.991 mm, EFL may be about 1.916 mm, the image height may
be about 2.099 mm, HFOV may be about 73.037 degrees, and Fno may be
about 2.759.
[0174] In comparison with the first embodiment, TTL of the ninth
embodiment may be smaller. Further, the ninth embodiment of the
optical imaging lens may be manufactured more easily and the yield
rate may be higher.
[0175] Reference is now made to FIGS. 42-45. FIG. 42 illustrates an
example cross-sectional view of an optical imaging lens 10 having
four lens elements according to a tenth example embodiment. FIG. 43
shows example charts of longitudinal spherical aberration and other
kinds of optical aberrations of the optical imaging lens 10
according to the tenth embodiment. FIG. 44 shows an example table
of optical data of each lens element of the optical imaging lens 10
according to the tenth example embodiment. FIG. 45 shows an example
table of aspherical data of the optical imaging lens 10 according
to the tenth example embodiment. The reference numbers labeled in
the present embodiment are similar to those in the first embodiment
for the similar elements, but here the reference numbers are
initialed with 10, for example, reference number 1031 for labeling
the object-side surface of the third lens element 1030, reference
number 1032 for labeling the image-side surface of the third lens
element 1030, etc.
[0176] As shown in FIG. 42, the optical imaging lens 10 of the
present embodiment, in an order from an object side A1 to an image
side A2 along an optical axis, may comprise a first lens element
1010, a second lens element 1020, an aperture stop 1000, a third
lens element 1030 and a fourth lens element 1040.
[0177] The arrangement of the convex or concave surface structures,
including the object-side surfaces 1011, 1021, 1031, and 1041 and
the image-side surfaces 1012, 1022, 1032, and 1042 are generally
similar to the optical imaging lens 1. The differences between the
optical imaging lens 1 and the optical imaging lens 10 may include
a radius of curvature, a thickness, aspherical data, and an
effective focal length of each lens element.
[0178] Here, for clearly showing the drawings of the present
embodiment, only the surface shapes which are different from that
in the first embodiment are labeled. Please refer to FIG. 44 for
the optical characteristics of each lens elements in the optical
imaging lens 10 of the present embodiment.
[0179] From the vertical deviation of each curve shown in FIG. 43
part (a), the offset of the off-axis light relative to the image
point may be within .+-.0.02 mm. Referring to FIG. 43 part (b), the
focus variation with respect to the three different wavelengths
(830 nm, 850 nm and 870 nm) in the whole field falls within
.+-.0.02 mm. Referring to FIG. 43 part (c), the focus variation
with respect to the three different wavelengths (830 nm, 850 nm and
870 nm) in the whole field falls within .+-.0.02 mm. Referring to
FIG. 43 part (d), the variation of the distortion aberration of the
optical imaging lens 10 may be within .+-.70%.
[0180] Please refer to FIG. 58B for the values of T1, G12, T2, G23,
T3, G34, T4, EFL, TL, BFL, ALT, Gaa, TTL, TTL/(T2+G34), G12/T2,
TTL/G12, ALT/(G12+G34), TTL/(G12+G34), ALT/G12, (T2+T3)/G34,
(G12+T3)/T2, Gaa/T2, TL/(G12+G34), (G12+G34)/T2, T3/G34,
(T2+G23)/G34, ALT/G34, TTL/G34, TL/G34, (T2+T1)/G34, (T4+T2)/G34,
EFL/G34 and (T4+T3)/G34 of the present embodiment.
[0181] The distance from the object-side surface 1011 of the first
lens element 1010 to the image plane 1060 along the optical axis
may be about 9.110 mm, EFL may be about 2.164 mm, the image height
may be about 2.099 mm, HFOV may be about 73.050 degrees, and Fno
may be about 2.736.
[0182] In comparison with the first embodiment, HFOV of the tenth
embodiment may be larger, and TTL and Fno of the tenth embodiment
may be smaller. Further, the tenth embodiment of the optical
imaging lens may be manufactured more easily and the yield rate may
be higher.
[0183] Reference is now made to FIGS. 46-49. FIG. 46 illustrates an
example cross-sectional view of an optical imaging lens 11 having
four lens elements of the optical imaging lens according to a
eleventh example embodiment. FIG. 47 shows example charts of
longitudinal spherical aberration and other kinds of optical
aberrations of the optical imaging lens 11 according to the
eleventh example embodiment. FIG. 48 shows an example table of
optical data of each lens element of the optical imaging lens 11
according to the eleventh example embodiment. FIG. 49 shows an
example table of aspherical data of the optical imaging lens 11
according to the eleventh example embodiment. The reference numbers
labeled in the present embodiment are similar to those in the first
embodiment for the similar elements, but here the reference numbers
are initialled with 11, for example, reference number 1131 for
labelling the object-side surface of the third lens element 1130,
reference number 1132 for labelling the image-side surface of the
third lens element 1130, etc.
[0184] As shown in FIG. 46, the optical imaging lens 11 of the
present embodiment, in an order from an object side A1 to an image
side A2 along an optical axis, may comprise a first lens element
1110, a second lens element 1120, an aperture stop 1100, a third
lens element 1130 and a fourth lens element 1140.
[0185] The arrangement of the convex or concave surface structures,
including the object-side surfaces 1111', 1121', 1131, and 1141 and
the image-side surfaces 1112', 1122', 1132, and 1142 are generally
the same with the optical imaging lens 1. The differences between
the optical imaging lens 1 and the optical imaging lens 11 may
include a radius of curvature, a thickness, aspherical data, and an
effective focal length of each lens element.
[0186] Here, for clearly showing the drawings of the present
embodiment, only the surface shapes which are different from that
in the first embodiment are labeled. Please refer to FIG. 48 for
the optical characteristics of each lens elements in the optical
imaging lens 11 of the present embodiment.
[0187] From the vertical deviation of each curve shown in FIG. 47
part (a), the offset of the off-axis light relative to the image
point may be within about .+-.0.012 mm. Referring to FIG. 47 part
(b), the focus variation with respect to the three different
wavelengths (830 nm, 850 nm and 870 nm) in the whole field may fall
within about .+-.0.016 mm. Referring to FIG. 47 part (c), the focus
variation with respect to the three different wavelengths (830 nm,
850 nm and 870 nm) in the whole field may fall within about
.+-.0.01 mm. Refer to FIG. 47 part (d), the variation of the
distortion aberration of the optical imaging lens 11 may be within
about .+-.70%.
[0188] Please refer to FIG. 58B for the values of T1, G12, T2, G23,
T3, G34, T4, EFL, TL, BFL, ALT, Gaa, TTL, TTL/(T2+G34), G12/T2,
TTL/G12, ALT/(G12+G34), TTL/(G12+G34), ALT/G12, (T2+T3)/G34,
(G12+T3)/T2, Gaa/T2, TL/(G12+G34), (G12+G34)/T2, T3/G34,
(T2+G23)/G34, ALT/G34, TTL/G34, TL/G34, (T2+T1)/G34, (T4+T2)/G34,
EFL/G34 and (T4+T3)/G34 of the present embodiment.
[0189] The distance from the object-side surface 1111' of the first
lens element 1110 to the image plane 1160 along the optical axis
may be about 8.967 mm, EFL may be about 1.864 mm, the image height
may be about 2.104 mm, HFOV may be about 72.998 degrees, and Fno
may be about 2.757
[0190] Comparing with the first embodiment, the longitudinal
spherical aberration, the astigmatism aberration in the tangential
direction and TTL of the eleventh embodiment may be smaller.
Further, the eleventh embodiment may be manufactured more easily
and the yield rate may be higher.
[0191] Reference is now made to FIGS. 50-53. FIG. 50 illustrates an
example cross-sectional view of an optical imaging lens 12 having
four lens elements of the optical imaging lens according to a
twelfth example embodiment. FIG. 51 shows example charts of
longitudinal spherical aberration and other kinds of optical
aberrations of the optical imaging lens 12 according to the twelfth
example embodiment. FIG. 52 shows an example table of optical data
of each lens element of the optical imaging lens 12 according to
the twelfth example embodiment. FIG. 53 shows an example table of
aspherical data of the optical imaging lens 12 according to the
twelfth example embodiment. The reference numbers labeled in the
present embodiment are similar to those in the first embodiment for
the similar elements, but here the reference numbers are initialled
with 12, for example, reference number 1231 for labelling the
object-side surface of the third lens element 1230, reference
number 1232 for labelling the image-side surface of the third lens
element 1230, etc.
[0192] As shown in FIG. 50, the optical imaging lens 12 of the
present embodiment, in an order from an object side A1 to an image
side A2 along an optical axis, may comprise a first lens element
1210, a second lens element 1220, an aperture stop 1200, a third
lens element 1230 and a fourth lens element 1240.
[0193] The arrangement of the convex or concave surface structures,
including the object-side surfaces 1211', 1221', and 1231 and the
image-side surfaces 1212', 1222', 1232, and 1242 are generally same
with the optical imaging lens 1. The differences between the
optical imaging lens 1 and the optical imaging lens 12 may include
the concave/convex shapes of the object-side surface 1241, a radius
of curvature, a thickness, aspherical data, and an effective focal
length of each lens element. More specifically, the object-side
surface 1241 may comprise a convex portion 12411 in a vicinity of
the optical axis.
[0194] Here, for clearly showing the drawings of the present
embodiment, only the surface shapes which are different from that
in the first embodiment are labeled. Please refer to FIG. 52 for
the optical characteristics of each lens elements in the optical
imaging lens 12 of the present embodiment.
[0195] From the vertical deviation of each curve shown in FIG. 51
part (a), the offset of the off-axis light relative to the image
point may be within about .+-.0.005 mm. Referring to FIG. 51 part
(b), the focus variation with respect to the three different
wavelengths (830 nm, 850 nm and 870 nm) in the whole field may fall
within about .+-.0.012 mm. Referring to FIG. 51 part (c), the focus
variation with respect to the three different wavelengths (830 nm,
850 nm and 870 nm) in the whole field may fall within about
.+-.0.01 mm. Referring to FIG. 51 part (d), the variation of the
distortion aberration of the optical imaging lens 12 may be within
about .+-.70%.
[0196] Please refer to FIG. 58B for the values of T1, G12, T2, G23,
T3, G34, T4, EFL,
[0197] TL, BFL, ALT, Gaa, TTL, TTL/(T2+G34), G12/T2, TTL/G12,
ALT/(G12+G34), TTL/(G12+G34), ALT/G12, (T2+T3)/G34, (G12+T3)/T2,
Gaa/T2, TL/(G12+G34), (G12+G34)/T2, T3/G34, (T2+G23)/G34, ALT/G34,
TTL/G34, TL/G34, (T2+T1)/G34, (T4+T2)/G34, EFL/G34 and (T4+T3)/G34
of the present embodiment.
[0198] The distance from the object-side surface 1211' of the first
lens element 1210 to the image plane 1260 along the optical axis
may be about 10.885 mm, EFL may be about 1.873 mm, the image height
may be about 2.095 mm, HFOV may be about 73.016 degrees, and Fno
may be about 2.785.
[0199] In comparison with the first embodiment, TTL, the
longitudinal spherical aberration, and the astigmatism aberration
in the sagittal and tangential directions in the twelfth embodiment
may be smaller. Further, the twelfth embodiment may be manufactured
more easily and the yield rate may be higher.
[0200] Reference is now made to FIGS. 54-57. FIG. 54 illustrates an
example cross-sectional view of an optical imaging lens 13 having
four lens elements of the optical imaging lens according to a
thirteenth example embodiment. FIG. 55 shows example charts of
longitudinal spherical aberration and other kinds of optical
aberrations of the optical imaging lens 13 according to the
thirteenth example embodiment. FIG. 56 shows an example table of
optical data of each lens element of the optical imaging lens 13
according to the thirteenth example embodiment. FIG. 57 shows an
example table of aspherical data of the optical imaging lens 13
according to the thirteenth example embodiment. The reference
numbers labeled in the present embodiment are similar to those in
the first embodiment for the similar elements, but here the
reference numbers are initialled with 13, for example, reference
number 1331 for labelling the object-side surface of the third lens
element 1330, reference number 1332 for labelling the image-side
surface of the third lens element 1330, etc.
[0201] As shown in FIG. 54, the optical imaging lens 13 of the
present embodiment, in an order from an object side A1 to an image
side A2 along an optical axis, may comprise a first lens element
1310, an aperture stop 1300, a second lens element 1320, a third
lens element 1330 and a fourth lens element 1340.
[0202] The arrangement of the convex or concave surface structures,
including the object-side surfaces 1311', 1321', 1331, and 1341 and
the image-side surfaces 1312', 1322', 1332, and 1342 are generally
same with the optical imaging lens 1. The differences between the
optical imaging lens 1 and the optical imaging lens 13 may include
the position of the aperture stop, a radius of curvature, a
thickness, aspherical data, and an effective focal length of each
lens element. More specifically, the aperture stop 1300 is
positioned between the first lens element 1310 and the second lens
element 1320.
[0203] Here, for clearly showing the drawings of the present
embodiment, only the surface shapes which are different from that
in the first embodiment are labeled. Please refer to FIG. 56 for
the optical characteristics of each lens elements in the optical
imaging lens 13 of the present embodiment.
[0204] From the vertical deviation of each curve shown in FIG. 55
part (a), the offset of the off-axis light relative to the image
point may be within about .+-.0.007 mm. Referring to FIG. 55 part
(b), the focus variation with respect to the three different
wavelengths (830 nm, 850 nm and 870 nm) in the whole field may fall
within about .+-.0.02 mm. Referring to FIG. 55 part (c), the focus
variation with respect to the three different wavelengths (830 nm,
850 nm and 870 nm) in the whole field may fall within about
.+-.0.01 mm. Referring to FIG. 55 part (d), the variation of the
distortion aberration of the optical imaging lens 13 may be within
about .+-.70%.
[0205] Please refer to FIG. 58B for the values of T1, G12, T2, G23,
T3, G34, T4, EFL, TL, BFL, ALT, Gaa, TTL, TTL/(T2+G34), G12/T2,
TTL/G12, ALT/(G12+G34), TTL/(G12+G34), ALT/G12, (T2+T3)/G34,
(G12+T3)/T2, Gaa/T2, TL/(G12+G34), (G12+G34)/T2, T3/G34,
(T2+G23)/G34, ALT/G34, TTL/G34, TL/G34, (T2+T1)/G34, (T4+T2)/G34,
EFL/G34 and (T4+T3)/G34 of the present embodiment.
[0206] The distance from the object-side surface 1311' of the first
lens element 1310 to the image plane 1360 along the optical axis
may be about 10.969 mm, EFL may be about 1.842 mm, the image height
may be about 2.126 mm, HFOV may be about 73.055 degrees, and Fno
may be about 2.716.
[0207] In comparison with the first embodiment, TTL, Fno, the
longitudinal spherical aberration, and the astigmatism aberration
in the tangential direction in the thirteenth embodiment may be
smaller, and HFOV in the thirteenth embodiment may be larger.
Further, the thirteenth embodiment may be manufactured more easily
and the yield rate may be higher.
[0208] Please refer to FIGS. 58A and 58B show the values of EFL,
TL, BFL, ALT, Gaa, TTL, TTL/(T2+G34), G12/T2, TTL/G12,
ALT/(G12+G34), TTL/(G12+G34), ALT/G12, (T2+T3)/G34, (G12+T3)/T2,
Gaa/T2, TL/(G12+G34), (G12+G34)/T2, T3/G34, (T2+G23)/G34, ALT/G34,
TTL/G34, TL/G34, (T2+T1)/G34, (T4+T2)/G34, EFL/G34 and (T4+T3)/G34
of the first to thirteenth embodiments, and it is clear that the
optical imaging lenses of the first to thirteenth embodiments may
satisfy the Equations (1)-(20).
[0209] According to above disclosure, the longitudinal spherical
aberration, the astigmatism aberration and the variation of the
distortion aberration of each embodiment meet the use requirements
of various electronic products which implement an optical imaging
lens. Moreover, the off-axis light with respect to 830 nm, 850 nm
and 870 nm wavelengths may be focused around an image point, and
the offset of the off-axis light for each curve relative to the
image point may be controlled to effectively inhibit the
longitudinal spherical aberration, the astigmatism aberration and
the variation of the distortion aberration. Further, as shown by
the imaging quality data provided for each embodiment, the distance
between the 830 nm, 850 nm and 870 nm wavelengths may indicate that
focusing ability and inhibiting ability for dispersion is provided
for different wavelengths.
[0210] The material of the third lens element in each embodiment
using glass may have improved thermal stability. The embodiments in
present disclosure may have focusing ability and inhibiting ability
for dispersion for infrared wavelengths, such that the present
disclosure may be applied for a night version lens, a pupil
recognition lens or a VR tracker for infrared imaging and provide
improved imaging quality.
[0211] According to above illustration, the optical imaging lens of
the present disclosure may provide an effectively shortened optical
imaging lens length while maintaining good optical characteristics,
by controlling the structure of the lens elements as well as at
least one of the inequalities described herein.
[0212] While various embodiments in accordance with the disclosed
principles been described above, it should be understood that they
are presented by way of example only, and are not limiting. Thus,
the breadth and scope of exemplary embodiment(s) should not be
limited by any of the above-described embodiments, but should be
defined only in accordance with the claims and their equivalents
issuing from this disclosure. Furthermore, the above advantages and
features are provided in described embodiments, but shall not limit
the application of such issued claims to processes and structures
accomplishing any or all of the above advantages.
[0213] Additionally, the section headings herein are provided for
consistency with the suggestions under 37 C.F.R. 1.77 or otherwise
to provide organizational cues. These headings shall not limit or
characterize the invention(s) set out in any claims that may issue
from this disclosure. Specifically, a description of a technology
in the "Background" is not to be construed as an admission that
technology is prior art to any invention(s) in this disclosure.
Furthermore, any reference in this disclosure to "invention" in the
singular should not be used to argue that there is only a single
point of novelty in this disclosure. Multiple inventions may be set
forth according to the limitations of the multiple claims issuing
from this disclosure, and such claims accordingly define the
invention(s), and their equivalents, that are protected thereby. In
all instances, the scope of such claims shall be considered on
their own merits in light of this disclosure, but should not be
constrained by the headings herein.
* * * * *