U.S. patent application number 14/289462 was filed with the patent office on 2015-02-26 for mobile device and optical imaging lens thereof.
This patent application is currently assigned to Genius Electronic Optical Co., Ltd.. The applicant listed for this patent is Genius Electronic Optical Co., Ltd.. Invention is credited to Kuo-Wen Chang, Sheng Wei Hsu, Poche Lee.
Application Number | 20150055230 14/289462 |
Document ID | / |
Family ID | 48871870 |
Filed Date | 2015-02-26 |
United States Patent
Application |
20150055230 |
Kind Code |
A1 |
Chang; Kuo-Wen ; et
al. |
February 26, 2015 |
Mobile Device and Optical Imaging Lens Thereof
Abstract
Present embodiments provide for a mobile device and an optical
imaging lens thereof. The optical imaging lens comprises five lens
elements 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 to allow the thickness of the second
lens element and the sum of all air gaps between all five lens
elements along the optical axis satisfying the relation:
0.20<T2<0.50 (mm) and 0.27<(T2/G.sub.aa)<0.40, the
optical imaging lens shows better optical characteristics and the
total length of the optical imaging lens is shortened.
Inventors: |
Chang; Kuo-Wen; (Taichung
City, CN) ; Lee; Poche; (Taichung City, CN) ;
Hsu; Sheng Wei; (Taichung City, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Genius Electronic Optical Co., Ltd. |
Cupertino |
CA |
US |
|
|
Assignee: |
Genius Electronic Optical Co.,
Ltd.
Cupertino
CA
|
Family ID: |
48871870 |
Appl. No.: |
14/289462 |
Filed: |
May 28, 2014 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
13617231 |
Sep 14, 2012 |
8773767 |
|
|
14289462 |
|
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Current U.S.
Class: |
359/763 |
Current CPC
Class: |
G02B 13/0045 20130101;
G02B 13/18 20130101; G02B 9/60 20130101; G02B 7/08 20130101; G02B
27/0025 20130101; H04N 5/2257 20130101 |
Class at
Publication: |
359/763 |
International
Class: |
G02B 13/00 20060101
G02B013/00; G02B 9/60 20060101 G02B009/60 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 30, 2012 |
TW |
101111443 |
Claims
1. An optical imaging lens comprising, from an object side to an
image side: an aperture stop; a first lens element; a second lens
element; a third lens element; a fourth lens element; and a fifth
lens element, each of the first, second, third, fourth, and fifth
lens element having an object-side surface facing toward the object
side and an image-side surface facing toward the image side,
wherein: the image-side surface of the first lens element has a
concave portion in a vicinity of an optical axis; the object-side
surface of the second lens element has a convex portion in a
vicinity of an optical axis, and the image-side surface of the
second lens element has a concave portion in a vicinity of a
periphery; the object-side surface of the fourth lens element has a
concave portion in a vicinity of the optical axis, and the
image-side surface of the fourth lens element has a convex portion
in a vicinity of the optical axis; the object-side surface of the
fifth lens element has a convex portion in a vicinity of the
optical axis, and the image-side surface of the fifth lens element
has a concave portion in a vicinity of the optical axis; the
optical imaging lens has only five lens elements having a
refracting power; and the optical imaging lens satisfies the
following relations: 7.508.ltoreq.ALT/AG34.ltoreq.13.850;
3.934.ltoreq.AAG/AG23.ltoreq.6.028; and
2.570.ltoreq.T5/AG12.ltoreq.4.340, wherein ALT is a sum of
thicknesses of the first to fifth lens elements, AG34 is a width of
an air gap between the third and fourth lens elements along the
optical axis, AAG is a sum of widths of air gaps between the first
to fifth lens elements, AG23 is a width of an air gap between the
second and third lens elements along the optical axis, T5 is a
thickness of the fifth lens element along the optical axis, and
AG12 is a width of an air gap between the first and second lens
elements along the optical axis.
2. The optical imaging lens of claim 1 wherein a ratio TTL/T1 is
between 8.087 and 10.394, wherein TTL is a distance at the optical
axis between the object-side surface of the first lens element and
an image plane at the image side and T1 is a thickness of the first
lens element along the optical axis.
3. The optical imaging lens of claim 1 wherein a ratio ALT/T3 is
between 3.525 and 7.172, wherein T3 is a thickness of the third
lens element along the optical axis.
4. The optical imaging lens of claim 1 wherein a ratio AAG/AG45 is
between 2.324 and 11.920, wherein AG45 is a width of an air gap
between the fourth and fifth lens elements along the optical
axis.
5. The optical imaging lens of claim 1 wherein a ratio T3/T1 is
between 0.555 and 1.418, wherein T3 is a thickness of the third
lens element along the optical axis and T1 is a thickness of the
first lens element along the optical axis.
6. The optical imaging lens of claim 1 wherein a ratio T4/T2 is
between 0.949 and 2.350, wherein T4 is a thickness of the fourth
lens element along the optical axis and T2 is a thickness of the
second lens element along the optical axis.
7. The optical imaging lens of claim 1 wherein a ratio T3/AG34 is
between 1.047 and 3.929, wherein T3 is a thickness of the third
lens element along the optical axis.
8. An optical imaging lens comprising, from an object side to an
image side: an aperture stop; a first lens element; a second lens
element; a third lens element; a fourth lens element; and a fifth
lens element, each of the first, second, third, fourth, and fifth
lens elements having an object-side surface facing toward the
object side and an image-side surface facing toward the image side,
wherein: the image-side surface of the first lens element has a
concave portion in a vicinity of an optical axis; the object-side
surface of the second lens element has a convex portion in a
vicinity of the optical axis, and the image-side surface of the
second lens element has a concave portion in a vicinity of a
periphery; the object-side surface of the fourth lens element has a
concave portion in a vicinity of the optical axis, and the
image-side surface of the fourth lens element has a convex portion
in a vicinity of the optical axis; the object-side surface of the
fifth lens element has a convex portion in a vicinity of the
optical axis, and the image-side surface of the fifth lens element
has a concave portion in a vicinity of the optical axis; the
optical imaging lens has only five lens elements having a
refracting power; and the optical imaging lens satisfies the
following relations: 7.508.ltoreq.ALT/AG34.ltoreq.13.850;
0.726.ltoreq.T2/AG23.ltoreq.1.590; and
2.570.ltoreq.T5/AG12.ltoreq.4.340, wherein ALT is a sum of
thicknesses of the first to fifth lens elements, AG34 is a width of
an air gap between the third and fourth lens elements along the
optical axis, T2 is a thickness of the second lens element along
the optical axis, AG23 is a width of an air gap between the second
and third lens elements along the optical axis, T5 is a thickness
of the fifth lens element along the optical axis, and AG12 is a
width of an air gap between the first and second lens elements
along the optical axis.
9. The optical imaging lens of claim 8 wherein a ratio AG23/AG45 is
between 0.385 and 3.030, wherein AG45 is a width of an air gap
between the fourth and fifth lens elements along the optical
axis.
10. The optical imaging lens of claim 8 wherein a ratio T4/T2 is
between 0.949 and 2.350, wherein T4 is a thickness of the fourth
lens element along the optical axis.
11. The optical imaging lens of claim 8 wherein a ratio TTL/T3 is
between 7.333 and 14.575, wherein TTL is a distance at the optical
axis between the object-side surface of the first lens element and
an image plane at the image side and T3 is a thickness of the third
lens element along the optical axis.
12. The optical imaging lens of claim 8 wherein a ratio AAG/AG45 is
between 2.324 and 11.920, wherein AAG is a sum of widths of air
gaps between the first to fifth lens elements and AG45 is a width
of an air gap between the fourth and fifth lens elements along the
optical axis.
13. The optical imaging lens of claim 8 wherein a ratio T4/AG45 is
between 0.512 and 5.170, wherein T4 is a thickness of the fourth
lens element along the optical axis and AG45 is a width of an air
gap between the fourth and fifth lens elements along the optical
axis.
14. The optical imaging lens of claim 8 wherein a ratio T1/T3 is
between 0.705 and 1.802, wherein T1 is a thickness of the first
lens element along the optical axis and T3 is a thickness of the
third lens element along the optical axis.
15. An optical imaging lens comprising, from an object side to an
image side: an aperture stop; a first lens element; a second lens
element; a third lens element; a fourth lens element; and a fifth
lens element, each of the first, second, third, fourth, and fifth
lens elements having an object-side surface facing toward the
object side and an image-side surface facing toward the image side,
wherein: the image-side surface of the first lens element has a
concave portion in a vicinity of an optical axis; the object-side
surface of the second lens element has a convex portion in a
vicinity of the optical axis, and the image-side surface of the
second lens element has a concave portion in a vicinity of a
periphery; the object-side surface of the fourth lens element has a
concave portion in a vicinity of the optical axis, and the
image-side surface of the fourth lens element has a convex portion
in a vicinity of the optical axis; the object-side surface of the
fifth lens element has a convex portion in a vicinity of the
optical axis, and the image-side surface of the fifth lens element
has a concave portion in a vicinity of the optical axis; the
optical imaging lens has only five lens elements having a
refracting power; and the optical imaging lens satisfies the
following relations: 7.508.ltoreq.ALT/AG34.ltoreq.13.850;
2.306.ltoreq.AAG/T4.ltoreq.4.542; and
2.570.ltoreq.T5/AG12.ltoreq.4.340, wherein ALT is a sum of
thicknesses of the first to fifth lens elements, AG34 is a width of
an air gap between the third and fourth lens elements along the
optical axis, AAG is a sum of widths of air gaps between the first
to fifth lens elements, T4 is a thickness of the fourth lens
element along the optical axis, T5 is a thickness of the fifth lens
element along the optical axis, and AG12 is a width of an air gap
between the first and second lens elements along the optical
axis.
16. The optical imaging lens of claim 15 wherein a ratio AAG/AG45
is between 2.324 and 11.920, wherein AG45 is a width of an air gap
between the fourth and fifth lens elements along the optical
axis.
17. The optical imaging lens of claim 16 wherein a ratio TTL/T1 is
between 8.087 and 10.394, wherein TTL is a distance at the optical
axis between the object-side surface of the first lens element and
an image plane at the image side and T1 is a thickness of the first
lens element along the optical axis.
18. The optical imaging lens of claim 17 wherein a ratio ATL/T3 is
between 3.525 and 7.172, wherein T3 is a thickness of the third
lens element along the optical axis.
19. The optical imaging lens of claim 18 wherein a ratio T2/AG23 is
between 0.726 and 1.590, wherein T2 is a thickness of the second
lens element along the optical axis and AG23 is a width of an air
gap between the second and third lens elements along the optical
axis.
20. The optical imaging lens of claim 19 wherein a ratio AAG/AG23
is between 3.934 and 6.028.
Description
CROSS-REFERENCES TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. patent
application Ser. No. 13/617,231, filed on Sep. 14, 2012, entitled
"Mobile Device and Optical Imaging Lens Thereof" which claims
priority from Taiwan Patent Application No. 101111443, filed on
Mar. 30, 2012, the disclosures of which are hereby incorporated by
reference in their entirety for all purposes.
TECHNICAL FIELD
[0002] The present invention relates to a mobile device and an
optical imaging lens thereof, and particularly, relates to a mobile
device applying an optical imaging lens having five lens elements
and an optical imaging lens thereof.
BACKGROUND OF THE INVENTION
[0003] The ever-increasing demand for smaller sized mobile devices,
such as cell phones, digital cameras, etc. has correspondingly
triggered a growing need for smaller sized photography modules
contained therein. Size reductions may be contributed from various
aspects of the mobile devices, which includes not only the charge
coupled device (CCD) and the complementary metal-oxide
semiconductor (CMOS), but also the optical imaging lens mounted
therein. When reducing the size of the optical imaging lens,
however, achieveing good optical characteristics becomes a
challenging problem.
[0004] US Patent Publication No. 20100253829, US Patent Publication
No. 2011013069, US Patent Publication No. 20110249346, US Patent
Publication No. 20100254029, U.S. Pat. No. 7,826,151, U.S. Pat. No.
7,864,454, U.S. Pat. No. 7,911,711, U.S. Pat. No. 8,072,695, Taiwan
Patent No. M368072, Taiwan Patent No. M369460 and Taiwan Patent No.
M369459 all disclosed an optical imaging lens constructed with an
optical imaging lens having five lens elements. Those disclosed
optical imaging lenses involved use of a shortened length of the
optical imaging lens; however, some of lengths of the optical
imaging lens remained too long. For example, in the first
embodiment of Taiwan Patent No. M368072, the length of the optical
imaging lens is around 5.61 mm, which is not beneficial for the
smaller design of mobile devices.
[0005] How to effectively shorten the lengths of the optical
imaging lens is one of the most important topics in the industry to
peruse the trend of smaller and smaller mobile devices. Each of the
aforesaid patent documents faces the limitation of the size of the
mobile device due to the problem of reducing length of the optical
imaging lens. Therefore, there is needed to develop optical imaging
lens with shorter lengths, while also having good optical
characters.
SUMMARY OF THE INVENTION
[0006] An object of the present invention is to provide a mobile
device and an optical imaging lens thereof. With controlling the
convex or concave shape of the surfaces of the lens elements, the
central thickness along the optical axis, and the air gap between
two lens elements, etc., the lengths of the optical imaging lens is
shortened and meanwhile the good optical characters, such as high
resolution and the system performance, are sustained.
[0007] In an exemplary embodiment, an optical imaging lens
comprises, in order from an object side to an image side, a first
lens element, a second lens element, a third lens element, a fourth
lens element, and a fifth lens element. The first lens element has
positive refractive power and comprises a convex object-side curved
surface. The second lens element has negative refractive power and
comprises a concave image-side curved surface. The third lens
element comprises an object-side curved surface and an image-side
curved surface, and the object-side curved surface comprises a
concave portion in a vicinity of a periphery of said third lens
element and the image-side curved surface comprises a convex
portion in a vicinity of a periphery of the third lens element. The
fourth lens element comprises a convex image-side curved surface
and the fifth lens element comprises an object-side curved surface
and an image-side curved surface, wherein the object-side curved
surface comprises a convex portion in a vicinity of the optical
axis and the image-side curved surface comprises a concave portion
in a vicinity of the optical axis. Lens as a whole has only the
five lens elements with refractive power, wherein a central
thickness of the second lens element along the optical axis is T2,
a sum of all air gaps from the first lens element to the fifth lens
element along the optical axis is Gaa, and they satisfy the
relation:
0.20<T2<0.50 (mm); and
0.27<(T2/Gaa)<0.40.
[0008] In another exemplary embodiment, other central thickness of
lens element along the optical axis and/or other ratio of the
central thickness of lens element along the optical axis to the sum
of all air gaps could be further controlled, and an example among
them is controlling the relation of a central thickness of the
third lens element along the optical axis, T3, and the sum of all
air gaps from the first lens element to the fifth lens element
along the optical axis, Gaa, to satisfy the relation:
0.30<(T3/Gaa)<0.45.
[0009] Another example embodiment comprises controlling T3 to
further satisfy the relation:
0.20<T3<0.60 (mm).
[0010] Yet, another example embodiment comprises controlling T2 and
Gaa to further satisfy the relation:
0.21<T2<0.47 (mm); and
0.28<(T2/Gaa)<0.40.
[0011] Yet, another example embodiment comprises controlling T3 and
Gaa to further satisfy the relation:
0.25<T3<0.57 (mm); and
0.31<(T3/Gaa)<0.45.
[0012] Aforesaid exemplary embodiments are not limited and could be
selectively incorporated in other embodiments described herein.
[0013] Lens elements in example embodiments, such as the aforesaid
first lens element, second lens element, third lens element, fourth
lens element, and fifth lens element, are preferable made by
plastic lens element with injection molding. Therefore, the
technical barrier and the cost may be affected by the thickness of
lens element. For example, if the central thickness of the second
lens element along the optical axis, T2, is less than the lower
limit, 0.2 (mm), the center of the second lens element may be too
thin and cause melting plastic material to fail to pass the mold,
and compared with currently technical level, the difficulty and
cost for production in such situations are too high. Therefore, the
lower limits of the above ranges of T2 and T3 are determined based
on currently technical level. Further, the thicknesses of the first
lens element, the second lens element, the third lens element, the
fourth lens element, and fifth lens element affect the length of
the optical imaging lens. For example, if the central thickness of
the second lens element along the optical axis, T2, exceeds the
upper limit, 0.5 (mm), the second lens element may be too thick and
cause the length of the optical imaging lens to be too long and
fail to match the request of smaller optical imaging lens.
Therefore, the upper limits of above ranges of T2 and T3 are
determined based on the preferable length of the optical imaging
lens.
[0014] In example embodiments, an aperture stop is provided for
adjusting the input of light of the system. For example, the
aperture stop is selectively provided but not limited to be
positioned at the object side of the first lens element, or
positioned between the first lens element and the second lens
element.
[0015] In some exemplary embodiments, more details about the convex
or concave surface structure and/or the refractive power 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. For example, for the second lens element, an
object-side curved surface is comprised, but the object-side curved
surface need not be limited to a convex portion in a vicinity of a
periphery of the second lens element. An example for illustrating
the details broadly for plural lens elements comprises the first
lens element having positive refractive power and comprising a
convex object-side curved surface; the second lens element having
negative refractive power and comprising an object-side curved
surface and a concave image-side curved surface; the third lens
element comprising an object-side curved surface and an image-side
curved surface, wherein the object-side curved surface comprises a
convex portion in a vicinity of the optical axis and a concave
portion in a vicinity of a periphery of the third lens element, and
the image-side curved surface comprises a concave portion in a
vicinity of the optical axis and a convex portion in a vicinity of
a periphery of the third lens element; the fourth lens element
having positive refractive power and comprising a concave
object-side curved surface and a convex image-side curved surface;
and the fifth lens element having negative refractive power and
comprising an object-side curved surface and an image-side curved
surface, wherein the object-side curved surface comprises a convex
portion in a vicinity of the optical axis and a convex portion in a
vicinity of a periphery of the fourth lens element, and the
image-side curved surface comprises a concave portion in a vicinity
of the optical axis and a convex portion in a vicinity of a
periphery of the fourth lens element. Another example for
illustrating the details broadly for plural lens elements comprises
the first lens element having positive refractive power and
comprising a convex object-side curved surface and a concave
image-side curved surface; the second lens element having negative
refractive power and comprising an object-side curved surface and a
concave image-side curved surface, wherein the object-side curved
surface of the second lens element comprises a convex portion in a
vicinity of the optical axis and a convex portion in a vicinity of
a periphery of the second lens element; the third lens element
comprising an object-side curved surface and an image-side curved
surface, wherein the object-side curved surface comprises a concave
portion in a vicinity of the optical axis and a concave portion in
a vicinity of a periphery of the third lens element, and the
image-side curved surface comprises a convex portion in a vicinity
of a periphery of the third lens element; the fourth lens element
having positive refractive power and comprising a concave
object-side curved surface and a convex image-side curved surface;
and the fifth lens element having negative refractive power and
comprising an object-side curved surface and an image-side curved
surface, wherein the object-side curved surface comprises a convex
portion in a vicinity of the optical axis and a convex portion in a
vicinity of a periphery of the fifth lens element, and the
image-side curved surface comprises a concave portion in a vicinity
of the optical axis and a convex portion in a vicinity of a
periphery of the fifth lens element. Exemplary embodiments for
incorporating details broadly for plural lens elements are not
limited to the above examples.
[0016] Further, exemplary embodiments could provide more details
about the structure, the refractive power, and/or the aperture stop
position for a specific lens element or broadly for plural lens
elements to fit variable requests. For example, based on the
aforesaid examples, an example embodiment comprises the first lens
element comprising a convex image-side curved surface, wherein the
object-side curved surface of the second lens element comprises a
concave portion in a vicinity of the optical axis and a concave
portion in a vicinity of a periphery of the second lens element,
the third lens element having positive refractive power, and an
aperture stop provided at the object side of the first lens
element. Another example embodiment is provided with the first lens
element comprising a convex image-side curved surface, wherein the
object-side curved surface of the second lens element comprises a
convex portion in a vicinity of the optical axis and a convex
portion in a vicinity of a periphery of the second lens element,
the third lens element having negative refractive power, and an
aperture stop provided at the object side of the first lens
element. Another example embodiment is provided with the first lens
element comprising a concave image-side curved surface, the
object-side curved surface of the second lens element comprising a
convex portion in a vicinity of the optical axis and a convex
portion in a vicinity of a periphery of the second lens element,
the third lens element having positive refractive power, and an
aperture stop provided between the first lens element and the
second lens element. Another example embodiment is provided with
the first lens element comprising a concave image-side curved
surface, the object-side curved surface of the second lens element
comprises a convex portion in a vicinity of the optical axis and a
concave portion in a vicinity of a periphery of the second lens
element, the third lens element having positive refractive power,
and an aperture stop provided at the object side of the first lens
element. Similarly, based on the later of the aforesaid examples,
more examples could be obtained with the further details listed
below, including an example embodiment is provided with the third
lens element having positive refractive power, and the third lens
element the image-side curved surface comprising a convex portion
in a vicinity of the optical axis. Another example embodiment is
provided with the third lens element having negative refractive
power, and the image-side curved surface of the third lens element
comprising a concave portion in a vicinity of the optical axis.
Another example embodiment is provided with the third lens element
having negative refractive power, and the image-side curved surface
of the third lens element comprising a convex portion in a vicinity
of the optical axis. It is noted that the examples above may be
incorporated into other embodiments if no inconsistencies
arise.
[0017] In another exemplary embodiment, a mobile device comprises a
housing and an optical imaging lens assembly positioned in the
housing. The optical imaging lens assembly comprises a lens barrel,
any of aforesaid example embodiments of optical imaging lens, a
module housing unit, and an image sensor. The lens comprising five
lens elements with refractive power as a whole is positioned in the
lens barrel, the module housing unit is for positioning the optical
imaging lens, and the image sensor is positioned at the image-side
of the optical imaging lens.
[0018] In exemplary embodiments, the module housing unit comprises,
but is not limited to, an image sensor base and an auto focus
module, wherein the image sensor base is for fixing the image
sensor, and the auto focus module comprises a lens seat for
positioning the optical imaging lens to control the focusing of the
optical imaging lens.
[0019] Through controlling the ratio of at least one central
thickness of lens element along the optical axis to a sum of all
air gaps between the five lens elements along the optical axis in a
predetermined range, and incorporated with the arrangement of the
convex or concave shape of the surfaces of the lens element(s)
and/or refraction power, the mobile device and the optical imaging
lens thereof in exemplary embodiments achieve good optical
characters and effectively shorten the lengths of the optical
imaging lens.
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Exemplary embodiments will be more readily understood from
the following detailed description when read in conjunction with
the appended drawing, in which:
[0021] FIG. 1 shows a cross-sectional view of an optical imaging
lens having five lens elements of the optical imaging lens
according to an example embodiment;
[0022] FIG. 2 shows another cross-sectional view of a lens element
of the optical imaging lens according to an example embodiment;
[0023] FIG. 3 shows a table of optical data of each lens element of
the optical imaging lens according to an example embodiment;
[0024] FIG. 4 shows a table of aspherical data of the optical
imaging lens according to an example embodiment;
[0025] FIG. 5(a) shows the longitudinal spherical aberration, FIGS.
5(b) and 5(c) show the respective astigmatic field curves in the
sagittal and tangential direction, and FIG. 5(d) shows the
distortion of the optical imaging lens of FIG. 1;
[0026] FIG. 6 shows a cross-sectional view of an optical imaging
lens having five lens elements of the optical imaging lens
according to an example embodiment;
[0027] FIG. 7 shows a table of optical data of each lens element of
the optical imaging lens according to an example embodiment;
[0028] FIG. 8 shows a table of aspherical data of the optical
imaging lens according to an example embodiment;
[0029] FIG. 9(a) shows the longitudinal spherical aberration, FIGS.
9(b) and 9(c) show the respective astigmatic field curves in the
sagittal and tangential direction, and FIG. 9(d) shows the
distortion of the optical imaging lens of FIG. 6;
[0030] FIG. 10 shows a cross-sectional view of an optical imaging
lens having five lens elements of the optical imaging lens
according to an example embodiment;
[0031] FIG. 11 shows a table of optical data of each lens element
of the optical imaging lens according to an example embodiment;
[0032] FIG. 12 shows a table of aspherical data of the optical
imaging lens according to an example embodiment;
[0033] FIG. 13(a) shows the longitudinal spherical aberration,
FIGS. 13(b) and 13(c) show the respective astigmatic field curves
in the sagittal and tangential direction, and FIG. 13(d) shows the
distortion of the optical imaging lens of FIG. 10;
[0034] FIG. 14 shows a cross-sectional view of an optical imaging
lens having five lens elements of the optical imaging lens
according to an example embodiment;
[0035] FIG. 15 shows a table of optical data of each lens element
of the optical imaging lens according to an example embodiment;
[0036] FIG. 16 shows a table of aspherical data of the optical
imaging lens according to an example embodiment;
[0037] FIG. 17(a) shows the longitudinal spherical aberration,
FIGS. 17(b) and 17(c) show the respective astigmatic field curves
in the sagittal and tangential direction, and FIG. 17(d) shows the
distortion of the optical imaging lens of FIG. 14;
[0038] FIG. 18 shows a cross-sectional view of an optical imaging
lens having five lens elements of the optical imaging lens
according to an example embodiment;
[0039] FIG. 19 shows a table of optical data of each lens element
of the optical imaging lens according to an example embodiment;
[0040] FIG. 20 shows a table of aspherical data of the optical
imaging lens according to an example embodiment;
[0041] FIG. 21(a) shows the longitudinal spherical aberration,
FIGS. 21(b) and 21(c) show the respective astigmatic field curves
in the sagittal and tangential direction, and FIG. 21(d) shows the
distortion of the optical imaging lens of FIG. 18;
[0042] FIG. 22 shows a cross-sectional view of an optical imaging
lens having five lens elements of the optical imaging lens
according to an example embodiment;
[0043] FIG. 23 shows a table of optical data of each lens element
of the optical imaging lens according to an example embodiment;
[0044] FIG. 24 shows a table of aspherical data of the optical
imaging lens according to an example embodiment;
[0045] FIG. 25(a) shows the longitudinal spherical aberration,
FIGS. 25(b) and 25(c) show the respective astigmatic field curves
in the sagittal and tangential direction, and FIG. 25(d) shows the
distortion of the optical imaging lens of FIG. 22;
[0046] FIG. 26 shows a cross-sectional view of an optical imaging
lens having five lens elements of the optical imaging lens
according to an example embodiment;
[0047] FIG. 27 shows a table of optical data of each lens element
of the optical imaging lens according to an example embodiment;
[0048] FIG. 28 shows a table of aspherical data of the optical
imaging lens according to the seventh embodiment of the present
invention;
[0049] FIG. 29(a) shows the longitudinal spherical aberration,
FIGS. 29(b) and 29(c) show the respective astigmatic field curves
in the sagittal and tangential direction, and FIG. 29(d) shows the
distortion of the optical imaging lens of FIG. 26;
[0050] FIG. 30 shows a comparison table for the values of T2, T3,
T2/Gaa and T3/Gaa of example embodiments;
[0051] FIG. 31 shows a structure of an example embodiment of a
mobile device;
[0052] FIG. 32 shows an enlarged view of a structure of an example
embodiment of a mobile device; and
[0053] FIG. 33 shows another enlarged view of a structure of an
example embodiment of a mobile device.
DETAILED DESCRIPTION OF THE INVENTION
[0054] 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 invention. 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 invention. 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.
[0055] Example embodiments of an optical imaging lens may comprise
a first lens element, a second lens element, a third lens element,
a fourth lens element, and a fifth lens element. These lens
elements may be arranged in an order from an object side to an
image side, and example embodiments of the lens as a whole may
comprise the five lens elements with refractive power. In an
example embodiment: the first lens element having positive
refractive power comprises a convex object-side curved surface; the
second lens element having negative refractive power comprises a
concave image-side curved surface; the third lens element comprises
an object-side curved surface and an image-side curved surface,
wherein the object-side curved surface comprises a concave portion
in a vicinity of a periphery of the third lens element and the
image-side curved surface comprises a convex portion in a vicinity
of a periphery of the third lens element; the fourth lens element
comprises a convex image-side curved surface; the fifth lens
element comprises an object-side curved surface and an image-side
curved surface, wherein the object-side curved surface comprises a
convex portion in a vicinity of the optical axis, the image-side
curved surface comprises a concave portion in a vicinity of the
optical axis. The central thickness of the second lens element the
along the optical axis, T2, and the sum of all air gaps between the
first lens element to the fifth lens element along the optical
axis, Gaa, satisfy the relation as followed:
0.20<T2<0.50 (mm) equation (1);
and
0.27<(T2/Gaa)<0.40 equation (2);
and/or
0.21<T2<0.47 (mm) equation (1');
and
0.28<(T2/Gaa)<0.40 equation (2');
[0056] to achieve good optical characters and shortened length of
the optical imaging lens.
[0057] In some example embodiments, other thicknesses of lens along
the optical axis and/or the ratio of which to the sum of all air
gaps can be also controlled, and an example is provided with
controlling a central thickness of the third lens element along the
optical axis, T3, and/or controlling the ratio of T3 to Gaa to
satisfy the relation:
0.20<T3<0.60 (mm) equation (3);
and/or
0.30<(T3/Gaa)<0.45 equation (4);
and/or
0.25<T3<0.57 (mm) equation (3');
and/or
0.31<(T3/Gaa)<0.45 equation (4').
[0058] Because example embodiments of the lens elements, such as
aforesaid first lens element, second lens element, third lens
element, fourth lens element, and fifth lens element, is preferable
a lens elements made by injection-molding plastic, the thickness of
the lens elements will affect the technical barrier and cost. For
example, if the central thickness of the second lens element along
the optical axis, T2, is less than the lower limit, 0.2 (mm), the
center of the second lens element may be too thin and cause melting
plastic material fail to pass the mold, and compared with currently
technical level, the difficulty and cost for production in such
situation are too high. It will be appreciated that the lower
limits of above ranges of T2 and T3 are determined based on current
technical levels. Further, the thicknesses of the first lens
element, the second lens element, the third lens element, the
fourth lens element, and fifth lens element affect the length of
the optical imaging lens. For example, if the central thickness of
the second lens element along the optical axis, T2, exceeds the
upper limit, 0.5 (mm), the second lens element will be too thick
and cause the length of the optical imaging lens to be too long and
fail to match the request of a smaller optical imaging lens.
Therefore, the upper limits of the above ranges of T2 and T3 are
determined based on the preferable length of the optical imaging
lens. When implementing example embodiments, more details about the
convex or concave surface structure and/or the refractive power may
be incorporated for one specific lens element or broadly for plural
lens elements to enhance the control for the system performance
and/or resolution, as illustrated in the following embodiments. It
is noted that the details listed here could be incorporated in
example embodiments if no inconsistency occurs.
[0059] Several exemplary embodiments and associated optical data
will now be provided for illustrating example embodiments of
optical imaging lens with good optical characters and shortened
lengths. Reference is now made to FIGS. 1-5. FIG. 1 illustrates an
example cross-sectional view of an optical imaging lens having five
lens elements of the optical imaging lens according to a first
example embodiment. FIG. 2 illustrates another example
cross-sectional view of a lens element of the optical imaging lens
according to an example embodiment. FIG. 3 depicts an example table
of optical data of each lens element of the optical imaging lens
according to an example embodiment. FIG. 4 depicts an example table
of aspherical data of the optical imaging lens according to an
example embodiment. FIG. 5 shows example charts of longitudinal
spherical aberration and other kinds of optical aberrations of the
optical imaging lens according to an example embodiment.
[0060] As shown in FIG. 1, the optical imaging lens of the present
embodiment comprises, in order from an object side A1 to an image
side A2, an aperture stop 100 positioned at the object side of a
first lens element 110, the first lens element 110, a second lens
element 120, a third lens element 130, a fourth lens element 140,
and a fifth lens element 150. Both of a filtering unit 160 and
image plane 170 of an image sensor are positioned at the image side
A2 of the optical imaging lens. The example embodiment of filtering
unit 160 illustrated is an IR cut filter (infrared cut filter)
positioned between the image-side curved surface 152 of the fifth
lens element 150 and an image plane 170, which filters out light
with specific wavelength from the light passing optical imaging
lens. For example, IR light is filtered out, and this will prohibit
the IR light which is not seen by human eyes from producing an
image on the image plane 170.
[0061] Exemplary embodiments of each lens elements of the optical
imaging lens will now be described with reference to the
drawings.
[0062] An example embodiment of the first lens element 110 may have
positive refractive power, which may be constructed by plastic
material, and may comprise a convex object-side curved surface 111
and a convex image-side curved surface 112. The convex surface 111
and convex surface 112 may both be aspherical surfaces.
[0063] The second lens element 120 may have negative refractive
power, which may be constructed by plastic material, and may
comprise an object-side curved surface 121 having a concave portion
1211 in a vicinity of the optical axis, a concave portion 1212
neighboring the circumference, and a concave image-side curved
surface 122. The curved surface 121 and concave surface 122 may
both be aspherical surfaces in a vicinity of the optical axis in a
vicinity of the optical axis in a vicinity of a periphery of the
fifth lens element 150.
[0064] The third lens element 130 may have positive refractive
power, which may be constructed by plastic material, and may
comprise an object-side curved surface 131 having a convex portion
1311 in a vicinity of the optical axis, and a concave portion 1312
in a vicinity of a periphery of the third lens element 130, and an
image-side curved surface 132. The image-side curved surface 132
may comprise a concave 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 curved surface 131, 132 may both be
aspherical surfaces.
[0065] The fourth lens element 140 may have positive refractive
power, which may be constructed by plastic material, and may
comprise a concave object-side curved surface 141 and a convex
image-side curved surface 142. The concave surface 141 and convex
surface 142 may both be aspherical surfaces.
[0066] The fifth lens element 150 may have negative refractive
power, which may be constructed by plastic material, and may
comprise an object-side curved surface 151, which may comprise a
convex portion 1511 in a vicinity of the optical axis and a convex
portion 1512 in a vicinity of a periphery of the fifth lens element
150, and an image-side curved surface 152, which may comprise a
concave portion 1521 in a vicinity of the optical axis and a convex
portion 1522 in a vicinity of a periphery of the fifth lens element
150. The curved surface 151 and the curved surface 152 may both be
gull wing surfaces of aspherical surfaces.
[0067] In example embodiments, air gaps exist between the lens
elements, the filtering unit 160, and the image plane 170 of the
image sensor. For example, FIG. 1 illustrates the air gaps d1
existing between the first lens element 110 and the second lens
element 120, the air gaps d2 existing between the second lens
element 120 and the third lens element 130, the air gaps d3
existing between the third lens element 130 and the fourth lens
element 140, the air gaps d4 existing between the fourth lens
element 140 and the fifth lens element 150, the air gaps d5
existing between fifth lens element 150 and the filtering unit 160,
and the air gaps d6 existing between the filtering unit 160 and the
image plane 170 of the image sensor. 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 (attached together and therefore form
one surface or do not form a surface at all), and in such
situation, the air gaps may not exist. The sum of all air gaps d1,
d2, d3, d4 between the first and fifth lens elements is denoted by
Gaa.
[0068] FIG. 3 depicts the optical characters of each lens elements
in the optical imaging lens of the present embodiment, wherein the
values of T2, T3, T2/Gaa and T3/Gaa are:
[0069] T2=0.31000 (mm), satisfying equations (1), (1');
[0070] T2/Gaa=0.28999, satisfying equations (2), (2');
[0071] T3=0.34207 (mm), satisfying equations (3), (3');
[0072] T3/Gaa=0.31999, satisfying equations (4), (4');
[0073] wherein the distance from the object-side curved surface 111
of the first lens element 110 to the image-side curved surface 152
of the fifth lens element 150 is 3.75436 (mm), and the length of
the optical imaging lens is shortened.
[0074] Please note that, in example embodiments, to clearly
illustrate the structure of each lens element, only the part where
light passes, i.e. effective part, is shown. For example, taking
the first lens element 110 as an example, FIG. 1 illustrates the
convex object-side curved surface 111 and the convex image-side
curved surface 112. However, when implementing each lens element of
the present embodiment, a non-effective part may be formed
selectively. Based on the first lens element 110, please refer to
FIG. 2, which illustrates the first lens element 110 comprising a
further non-effective part. Here the non-effective part is not
limited to a protruding part 113 for mounting the first lens
element 110 in the optical imaging lens, and light will not pass
through the protruding part 113.
[0075] As illustrated in FIG. 1, the aspherical surfaces, including
the convex surface 111 and the convex surface 112 of the first lens
element 110, the curved surface 121 and the concave surface 122 of
the second lens element 120, the curved surfaces 131, 132 of the
third lens element 130, the concave surface 141 and the convex
surface 142 of the fourth lens element 140, and the curved surface
151 and the curved surface 152 of fifth lens element 150, are all
defined by the aspherical formula:
Z ( Y ) = Y 2 R / ( 1 + 1 - ( 1 + K ) Y 2 R 2 ) + i = 1 n a 2 i
.times. Y 2 i ##EQU00001##
[0076] wherein:
[0077] R represents the radius of the surface of the lens
element;
[0078] 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);
[0079] Y represents the perpendicular distance between the point of
the aspherical surface and the optical axis;
[0080] K represents a conic constant;
[0081] a.sub.i represents an aspherical coefficient of i.sup.th
level;
[0082] and the values of each aspherical parameter are represented
in FIG. 4.
[0083] As illustrated in FIGs (a) through (d), the optical imaging
lens of present example embodiments show great characteristics in
the longitudinal spherical aberration (a), astigmatism aberration
in the sagittal direction (b), astigmatism aberration in the
tangential direction (c), and/or distortion aberration (d).
Therefore, according to above illustration, the optical imaging
lens of example embodiments indeed achieve great optical
performance and the length of the optical imaging lens is
effectively shortened.
[0084] Reference is now made to FIGS. 6-9. FIG. 6 illustrates an
example cross-sectional view of an optical imaging lens having five
lens elements of the optical imaging lens according to a second
example embodiment. FIG. 7 shows an example table of optical data
of each lens element of the optical imaging lens according to the
second example embodiment. FIG. 8 shows an example table of
aspherical data of the optical imaging lens according to the second
example embodiment. FIG. 9(a) shows the longitudinal spherical
aberration, FIGS. 9(b) and 9(c) show the respective astigmatic
field curves in the sagittal and tangential direction, and FIG.
9(d) shows the distortion of the optical imaging lens of FIG.
6.
[0085] As shown in FIG. 6, the optical imaging lens of the present
embodiment, in an order from an object side A1 to an image side A2,
comprises an aperture stop 200 positioned at the object side of a
first lens element 210, the first lens element 210, a second lens
element 220, a third lens element 230, a fourth lens element 240,
and a fifth lens element 250. Both of a filtering unit 260 and an
image plane 270 of an image sensor are positioned at the image side
A2 of the optical imaging lens. In an example embodiment, filtering
unit 260 is an IR cut filter positioned between the image-side
curved surface 252 of the fifth lens element 250 and the image
plane 270 to filter out light with specific wavelength from the
light passing optical imaging lens. For example, IR light is
filtered out, and this will prohibit the IR light which is not seen
by human eyes from producing an image on image plane 270.
[0086] One difference between the second embodiments and the first
embodiments is that the central thickness of lens T2 of the second
lens element 220 and the central thickness of lens T3 of the third
lens element 230 are different. In this regard, the sum of all air
gaps Gaa from the first lens element 210 to the fifth lens element
250 may be different. Please refer to FIG. 7 for the optical
characteristics of each lens elements in the optical imaging lens
of the present embodiment, wherein the values of T2, T3, T2/Gaa and
T3/Gaa are:
[0087] T2=0.25763 (mm), satisfying equations (1), (1');
[0088] T2/Gaa=0.29805, satisfying equations (2), (2');
[0089] T3=0.27660 (mm), satisfying equations (3), (3');
[0090] T3/Gaa=0.32000, satisfying equations (4), (4')
[0091] wherein the distance from the object side of the first lens
element to the image side of the fifth lens element is 3.68615 (mm)
and the length of the optical imaging lens is shortened.
[0092] Example embodiments of the lens elements of the optical
imaging lens may comprise the following example embodiments:
[0093] The first lens element 210 may have positive refractive
power, which may be constructed by plastic material, and may
comprise a convex object-side curved surface 211 and a convex
image-side curved surface 212. The convex surface 211 and convex
surface 212 may both be aspherical surfaces defined by the
aspherical formula. Please refer to FIG. 8 for values of the
aspherical parameters.
[0094] The second lens element 220 may have negative refractive
power, which may be constructed by plastic material, and may
comprise an object-side curved surface 221, which has a convex
portion 2211 in a vicinity of the optical axis and a convex portion
2212 in a vicinity of a periphery of the second lens element 220,
and a concave image-side curved surface 222. The curved surface 221
and concave surface 222 may both be aspherical surfaces defined by
the aspherical formula. Please refer to FIG. 8 for values of the
aspherical parameters.
[0095] The third lens element 230 may have negative refractive
power, which may be constructed by plastic material, and may
comprise an object-side curved surface 231, which has a convex
portion 2311 in a vicinity of the optical axis and a concave
portion 2312 in a vicinity of a periphery of the third lens element
230, and an image-side curved surface 232, which has a concave
portion 2321 in a vicinity of the optical axis and a convex portion
2322 in a vicinity of a periphery of the third lens element 230.
The curved surface 231, 232 may both be aspherical surfaces defined
by the aspherical formula. Please refer to FIG. 8 for values of the
aspherical parameters.
[0096] The fourth lens element 240 may have positive refractive
power, which may be constructed by plastic material, and may
comprise a concave object-side curved surface 241 and a convex
image-side curved surface 242. The concave surface 241 and convex
surface 242 may both be aspherical surfaces defined by the
aspherical formula. Please refer to FIG. 8 for values of the
aspherical parameters.
[0097] The fifth lens element 250 may have negative refractive
power, which may be constructed by plastic material, and may
comprise an object-side curved surface 251, which has a convex
portion 2511 in a vicinity of the optical axis and a convex portion
2512 in a vicinity of a periphery of the fifth lens element 250,
and an image-side curved surface 252, which has a concave portion
2521 in a vicinity of the optical axis and a convex portion 2522 in
a vicinity of a periphery of the fifth lens element 250. The curved
surface 251, 252 may both be gull wing surfaces of the aspherical
surfaces defined by the aspherical formula. Please refer to FIG. 8
for values of the aspherical parameters.
[0098] In the present embodiment, similar to the first example
embodiment, air gaps may exist between the lens elements 210, 220,
230, 240, 250, the filtering unit 260, and the image plane 270 of
the image sensor. Please refer to the positions of the air gaps d1,
d2, d3, d4, d5, d6 marked in the first embodiment, wherein the sum
of the air gaps d1, d2, d3, d4 is Gaa.
[0099] As shown in FIG. 9, the optical imaging lens of the present
embodiment shows great characteristics in longitudinal spherical
aberration (a), astigmatism in the sagittal direction (b),
astigmatism in the tangential direction (c), or distortion
aberration (d). Therefore, according to the above illustration, the
optical imaging lens of the present embodiment indeed shows great
optical performance and the length of the optical imaging lens is
effectively shortened.
[0100] Reference is now made to FIGS. 10-13. FIG. 10 illustrates an
example cross-sectional view of an optical imaging lens having five
lens elements of the optical imaging lens according to a third
example embodiment. FIG. 11 depicts an example table of optical
data of each lens element of the optical imaging lens according to
the third example embodiment. FIG. 12 depicts an example table of
aspherical data of the optical imaging lens according to the third
example embodiment. FIG. 13 shows example charts of longitudinal
spherical aberration and other kinds of optical aberrations of the
optical imaging lens according to the third example embodiment.
[0101] As shown in FIG. 10, the optical imaging lens of the present
embodiment, in an order from an object side A1 to an image side A2,
comprises a first lens element 310, an aperture stop 300 positioned
between the first lens element 310 and a second lens element 320,
the second lens element 320, a third lens element 330, a fourth
lens element 340, and a fifth lens element 350. Both of a filtering
unit 360 and an image plane 370 of an image sensor may be
positioned at the image side A2 of the optical imaging lens. Here
an example embodiment of the filtering unit 360 is an IR cut filter
positioned between the image-side curved surface 352 of the fifth
lens element 350 and the image plane 370 to filter out light with
specific wavelength from the light passing optical imaging lens.
For example, the IR light is filtered out, and this will prohibit
the IR light which is not seen by human eyes from producing an
image on image plane 370.
[0102] Please refer to FIG. 11 for the optical characteristics of
each lens elements in the optical imaging lens of the present
embodiment, wherein the values of T2, T3, T2/Gaa and T3/Gaa
are:
[0103] T2=0.25285 (mm), satisfying equations (1), (1');
[0104] T2/Gaa=0.31316, satisfying equations (2), (2');
[0105] T3=0.27452 (mm), satisfying equations (3), (3');
[0106] T3/Gaa=0.34000, satisfying equations (4), (4');
[0107] wherein the distance from the object side of the first lens
element 310 to the image side of the fifth lens element 350 is
3.81589 (mm), and the length of the optical imaging lens is
shortened.
[0108] Example embodiments of the lens elements of the optical
imaging lens may comprise the following example embodiments:
[0109] The first lens element 310 may have positive refractive
power, which may be constructed by plastic material, and may
comprise a convex object-side curved surface 311 and a concave
image-side curved surface 312. The convex surface 311 and concave
surface 312 may both be aspherical surfaces defined by the
aspherical formula. Please refer to FIG. 12 for values of the
aspherical parameters.
[0110] The aperture stop 300 may be positioned between the first
lens element 310 and the second lens element 320.
[0111] The second lens element 320 may have negative refractive
power, which may be constructed by plastic material, and may
comprise an object-side curved surface 321, which has a convex
portion 3211 in a vicinity of the optical axis and a convex portion
3212 in a vicinity of a periphery of the second lens element 320,
and a concave image-side curved surface 322. The curved surface 321
and concave surface 322 may both be aspherical surfaces defined by
the aspherical formula. Please refer to FIG. 12 for values of the
aspherical parameters.
[0112] The third lens element 330 may have positive refractive
power, which may be constructed by plastic material, and may
comprise an object-side curved surface 331, which has a convex
portion 3311 in a vicinity of the optical axis and a concave
portion 3312 in a vicinity of a periphery of the third lens element
330, and an image-side curved surface 332, which has a concave
portion 3321 in a vicinity of the optical axis and a convex portion
3322 in a vicinity of a periphery of the third lens element 330.
The curved surface 331, 332 may both be aspherical surfaces defined
by the aspherical formula. Please refer to FIG. 12 for values of
the aspherical parameters.
[0113] The fourth lens element 340 may have positive refractive
power, which may be constructed by plastic material, and may
comprise a concave object-side curved surface 341 and a convex
image-side curved surface 342. The concave surface 341 and convex
surface 342 may both be aspherical surfaces defined by the
aspherical formula. Please refer to FIG. 12 for values of the
aspherical parameters.
[0114] The fifth lens element 350 may have negative refractive
power, which may be constructed by plastic material, and may
comprise an object-side curved surface 351, which has a convex
portion 3511 in a vicinity of the optical axis and a convex portion
3512 in a vicinity of a periphery of the fifth lens element 350,
and an image-side curved surface 352, which has a concave portion
3521 in a vicinity of the optical axis and a convex portion 3522 in
a vicinity of a periphery of the fifth lens element 350. The curved
surface 351, 352 may both be gull wing surfaces of aspherical
surfaces defined by the aspherical formula. Please refer to FIG. 12
for values of the aspherical parameters.
[0115] In the present embodiment, for comparison, similar to the
first embodiment, air gaps may exist between the lens elements 310,
320, 330, 340, 350, the filtering unit 360, and the image plane 370
of the image sensor. Please refer to the positions of the air gaps
d1, d2, d3, d4, d5, d6 marked in the first embodiment, wherein the
sum of the air gaps d1, d2, d3, d4 is Gaa.
[0116] One difference between the third embodiment and the first
embodiment is that the central thickness of lens T2 of the second
lens element 320 and the central thickness of lens T3 of the third
lens element 330 are different. In this regard, the sum of all air
gaps Gaa from the first lens element 310 to the fifth lens element
350 may be different. Further, the aperture stop 300 of the present
embodiment may be positioned between the first lens element 310 and
the second lens element 320, which may be different from the
position of the aperture stop 100 in front of the first lens
element 110 in the first embodiment.
[0117] As illustrated in FIG. 13, it is clear that the optical
imaging lens of the present embodiment may achieve great
characteristics in longitudinal spherical aberration (a),
astigmatism in the sagittal direction (b), astigmatism in the
tangential direction (c), or distortion aberration (d). Therefore,
according to above illustration, the optical imaging lens of the
present embodiment indeed achieve great optical performance, and
the length of the optical imaging lens is effectively
shortened.
[0118] Reference is now made to FIGS. 14-17. FIG. 14 illustrates an
example cross-sectional view of an optical imaging lens having five
lens elements of the optical imaging lens according to a fourth
example embodiment. FIG. 15 shows an example table of optical data
of each lens element of the optical imaging lens according to the
fourth example embodiment. FIG. 16 shows an example table of
aspherical data of the optical imaging lens according to the fourth
example embodiment. FIG. 17 shows example charts of longitudinal
spherical aberration and other kinds of optical aberrations of the
optical imaging lens according to the fourth example
embodiment.
[0119] As shown in FIG. 14, the optical imaging lens of the present
embodiment, in an order from an object side A1 to an image side A2,
comprises an aperture stop 400 positioned at the object side of a
first lens element 410, the first lens element 410, a second lens
element 420, a third lens element 430, a fourth lens element 440,
and a fifth lens element 450. Both of a filtering unit 460 and an
image plane 470 of an image sensor may be positioned at the image
side A2 of the optical imaging lens. Here an example embodiment of
filtering unit 460 is an IR cut filter, which may be positioned
between the image-side curved surface 452 of the fifth lens element
450 and the image plane 470 to filter out light with specific
wavelength from the light passing optical imaging lens. For
example, IR light may be filtered out, and this will prohibit the
IR light which is not seen by human eyes from producing an image on
image plane 470.
[0120] Please refer to FIG. 15 for the optical characteristics of
each lens elements in the optical imaging lens of the present
embodiment, wherein The values of T2, T3, T2/Gaa and T3/Gaa
are:
[0121] T2=0.45000 (mm), satisfying equations (1), (1');
[0122] T2/Gaa=0.39001, satisfying equations (2), (2');
[0123] T3=0.36920 (mm), satisfying equations (3), (3');
[0124] T3/Gaa=0.31998, satisfying equations (4), (4');
[0125] wherein the distance from the object side of the first lens
element to the image side of the fifth lens element is 3.71940
(mm), and the length of the optical imaging lens is shortened.
[0126] Example embodiments of the lens elements of the optical
imaging lens may comprise the following example embodiments:
[0127] The first lens element 410 may have positive refractive
power, which may be constructed by plastic material, and may
comprise a convex object-side curved surface 411 and a concave
image-side curved surface 412. The convex surface 411 and the
concave surface 412 may both be aspherical surfaces defined by the
aspherical formula. Please refer to FIG. 16 for values of the
aspherical parameters.
[0128] The second lens element 420 may have negative refractive
power, which may be constructed by plastic material, and may
comprise an object-side curved surface 421, which has a convex
portion 4211 in a vicinity of the optical axis and a concave
portion 4212 in a vicinity of a periphery of the second lens
element 420, and a concave image-side curved surface 422. The
curved surface 421 and concave surface 422 may both be aspherical
surfaces defined by the aspherical formula. Please refer to FIG. 16
for values of the aspherical parameters.
[0129] The third lens element 430 may have positive refractive
power, which may be constructed by plastic material, and may
comprise an object-side curved surface 431, which has a convex
portion 4311 in a vicinity of the optical axis and a concave
portion 4312 in a vicinity of a periphery of the third lens element
430, and an image-side curved surface 432, which has a concave
portion 4321 in a vicinity of the optical axis and a convex portion
4322 in a vicinity of a periphery of the third lens element 430.
The curved surface 431, 432 may both be aspherical surfaces defined
by the aspherical formula. Please refer to FIG. 16 for values of
the aspherical parameters.
[0130] The fourth lens element 440 may have positive refractive
power, which may be constructed by plastic material, and may
comprise a concave object-side curved surface 441 and a convex
image-side curved surface 442. The concave surface 441 and convex
surface 442 may both be aspherical surfaces defined by the
aspherical formula. Please refer to FIG. 16 for values of the
aspherical parameters.
[0131] The fifth lens element 450 may have negative refractive
power, which may be constructed by plastic material, and may
comprise an object-side curved surface 451, which has a convex
portion 4511 in a vicinity of the optical axis and a convex portion
4512 in a vicinity of a periphery of the fifth lens element 450,
and an image-side curved surface 452, which has a concave portion
4521 in a vicinity of the optical axis and a convex portion 4522 in
a vicinity of a periphery of the fifth lens element 450. The curved
surface 451, 452 may both be gull wing surfaces of aspherical
surfaces defined by the aspherical formula. Please refer to FIG. 16
for values of the aspherical parameters.
[0132] In the present embodiment, for comparison, similar to the
first embodiment, air gaps may exist between the lens elements 410,
420, 430, 440, 450, the filtering unit 460, and the image plane 470
of the image sensor. Please refer to the positions of the air gaps
d1, d2, d3, d4, d5, d6 marked in the first embodiment, wherein the
sum of the air gaps d1, d2, d3, d4 is Gaa.
[0133] One difference between the fourth embodiment and the first
embodiment is that the central thickness of lens T2 of the second
lens element 420 and the central thickness of lens T3 of the third
lens element 430 may be different. In this regard, the sum of all
air gaps Gaa from the first lens element 410 to the fifth lens
element 450 may be different.
[0134] As illustrated in FIG. 17, it is clear that the optical
imaging lens of the present embodiment may achieve great
characteristics in longitudinal spherical aberration (a),
astigmatism in the sagittal direction (b), astigmatism in the
tangential direction (c), or distortion aberration (d). Therefore,
according to above illustration, the optical imaging lens of the
present embodiment indeed achieves great optical performance, and
the length of the optical imaging lens is effectively
shortened.
[0135] Reference is now made to FIGS. 18-21. FIG. 18 illustrates an
example cross-sectional view of an optical imaging lens having five
lens elements of the optical imaging lens according to a fifth
embodiment. FIG. 19 shows an example table of optical data of each
lens element of the optical imaging lens according to the fifth
example embodiment. FIG. 20 shows an example table of aspherical
data of the optical imaging lens according to the fifth example
embodiment. FIG. 21 shows example charts of longitudinal spherical
aberration and other kinds of optical aberrations of the optical
imaging lens according to the fifth example embodiment.
[0136] As shown in FIG. 18, the optical imaging lens of the present
embodiment, in an order from an object side A1 to an image side A2,
comprises an aperture stop 500 positioned between the object side
and a first lens element 510, the first lens element 510, a second
lens element 520, a third lens element 530, a fourth lens element
540, and a fifth lens element 550. Both of a filtering unit 560 and
an image plane 570 of an image sensor may be positioned at the
image side A2 of the optical imaging lens. Here an example
embodiment of filtering unit 560 is an IR cut filter, which may be
positioned between the image-side curved surface 552 of the fifth
lens element 550 and the image plane 570 to filter out light with
specific wavelength from the light passing optical imaging lens.
For example, IR light may be filtered out, and this will prohibit
the IR light which is not seen by human eyes from producing an
image on image plane 570.
[0137] Please refer to FIG. 19 for the optical characteristics of
each lens elements in the optical imaging lens of the present
embodiment, wherein The values of T2, T3, T2/Gaa and T3/Gaa
are:
[0138] T2=0.29660 (mm), satisfying equations (1), (1');
[0139] T2/Gaa=0.29001, satisfying equations (2), (2');
[0140] T3=0.45000 (mm), satisfying equations (3), (3');
[0141] T3/Gaa=0.44001, satisfying equations (4), (4');
[0142] wherein the distance from the object side of the first lens
element to the image side of the fifth lens element is 3.70690
(mm), and the length of the optical imaging lens is shortened.
[0143] Example embodiments of the lens elements of the optical
imaging lens may comprise the following example embodiments:
[0144] The first lens element 510 may have positive refractive
power, which may be constructed by plastic material, and may
comprise a convex object-side curved surface 511 and a concave
image-side curved surface 512. The convex surface 511 and concave
surface 512 may both be aspherical surfaces defined by the
aspherical formula. Please refer to FIG. 20 for values of the
aspherical parameters.
[0145] The second lens element 520 may have negative refractive
power, which may be constructed by plastic material, and may
comprise an object-side curved surface 521, which has 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,
and a concave image-side curved surface 522. The curved surface 521
and concave surface 522 may both be aspherical surfaces defined by
the aspherical formula. Please refer to FIG. 20 for values of the
aspherical parameters.
[0146] The third lens element 530 may have positive refractive
power, which may be constructed by plastic material, and may
comprise an object-side curved surface 531, which has a concave
portion 5311 in a vicinity of the optical axis and a concave
portion 5312 in a vicinity of a periphery of the third lens element
530, and an image-side curved surface 532, which has a convex
portion 5321 in a vicinity of the optical axis and a convex portion
5322 in a vicinity of a periphery of the third lens element 530.
The curved surface 531, 532 may both be aspherical surfaces defined
by the aspherical formula. Please refer to FIG. 20 for values of
the aspherical parameters.
[0147] The fourth lens element 540 may have positive refractive
power, which may be constructed by plastic material, and may
comprise a concave object-side curved surface 541 and a convex
image-side curved surface 542. The concave surface 541 and convex
surface 542 may both be aspherical surfaces defined by the
aspherical formula. Please refer to FIG. 20 for values of the
aspherical parameters.
[0148] The fifth lens element 550 may have negative refractive
power, which may be constructed by plastic material, and may
comprise an object-side curved surface 551, which has a convex
portion 5511 in a vicinity of the optical axis and a convex portion
5512 in a vicinity of a periphery of the fifth lens element 550,
and an image-side curved surface 552, which has a concave portion
5521 in a vicinity of the optical axis and a convex portion 5522 in
a vicinity of a periphery of the fifth lens element 550. The curved
surfaces 551, 552 may both be gull wing surfaces of aspherical
surfaces defined by the aspherical formula. Please refer to FIG. 20
for values of the aspherical parameters.
[0149] In the present embodiment, for comparison, similar to the
first embodiment, air gaps may exist between the lens elements 510,
520, 530, 540, 550, the filtering unit 560, and the image plane 570
of the image sensor. Please refer to the positions of the air gaps
d1, d2, d3, d4, d5, d6 marked in the first embodiment, wherein the
sum of the air gaps d1, d2, d3, d4 is Gaa.
[0150] One difference between the fifth embodiment and the first
embodiment is that the central thickness of lens T2 of the second
lens element 520 and the central thickness of lens T3 of the third
lens element 530 may be different. Therefore, the sum of all air
gaps Gaa from the first lens element 510 to the fifth lens element
550 may be different.
[0151] As illustrated in FIG. 21, it is clear that the optical
imaging lens of the present embodiment may show great
characteristics in longitudinal spherical aberration (a),
astigmatism in the sagittal direction (b), astigmatism in the
tangential direction (c), or distortion aberration (d). Therefore,
according to above illustration, the optical imaging lens of the
present embodiment indeed achieves great optical performance, and
the length of the optical imaging lens is effectively
shortened.
[0152] Reference is now made to FIGS. 22-25. FIG. 22 illustrates an
example cross-sectional view of an optical imaging lens having five
lens elements of the optical imaging lens according to a sixth
example embodiment. FIG. 23 shows an example table of optical data
of each lens element of the optical imaging lens according to the
sixth example embodiment. FIG. 24 shows an example table of
aspherical data of the optical imaging lens according to the sixth
example embodiment. FIG. 25(a) shows the longitudinal spherical
aberration, FIGS. 25(b) and 25(c) show the respective astigmatic
field curves in the sagittal and tangential direction, and FIG.
25(d) shows the distortion according to the sixth example
embodiment.
[0153] As shown in FIG. 22, the optical imaging lens of the present
embodiment, in an order from an object side A1 to an image side A2,
comprises an aperture stop 600 positioned between the object side
and a first lens element 610, the first lens element 610, a second
lens element 620, a third lens element 630, a fourth lens element
640, and a fifth lens element 650. Both of a filtering unit 660 and
an image plane 670 of an image sensor may be positioned at the
image side A2 of the optical imaging lens. Here an example
embodiment of filtering unit 660 may be an IR cut filter, which may
be positioned between the image-side curved surface 652 of the
fifth lens element 650 and the image plane 670 to filter out light
with specific wavelength from the light passing optical imaging
lens. For example, IR light may be filtered out, and this may
prohibit the IR light which is not seen by human eyes from
producing an image on image plane 670.
[0154] Please refer to FIG. 23 for the optical characteristics of
each lens elements in the optical imaging lens of the present
embodiment, wherein The values of T2, T3, T2/Gaa and T3/Gaa
are:
[0155] T2=0.36250 (mm), satisfying equations (1), (1');
[0156] T2/Gaa=0.29000, satisfying equations (2), (2');
[0157] T3=0.55000 (mm), satisfying equations (3), (3');
[0158] T3/Gaa=0.44000, satisfying equations (4), (4');
[0159] wherein the distance from the object side of the first lens
element to the image side of the fifth lens element is 3.84120
(mm), and the length of the optical imaging lens is shortened.
[0160] Example embodiments of the lens elements of the optical
imaging lens may comprise the following example embodiments:
[0161] The first lens element 610 may have positive refractive
power, which may be constructed by plastic material, and may
comprise a convex object-side curved surface 611 and a concave
image-side curved surface 612. The convex surface 611 and 612 may
both be aspherical surfaces defined by the aspherical formula.
Please refer to FIG. 24 for values of the aspherical
parameters.
[0162] The second lens element 620 may have negative refractive
power, which may be constructed by plastic material, and may be an
object-side curved surface 621, which has a convex portion 6211 in
a vicinity of the optical axis and a convex portion 6212 in a
vicinity of a periphery of the second lens element 620, and a
concave image-side curved surface 622. The curved surface 621 and
concave surface 622 may both be aspherical surfaces defined by the
aspherical formula. Please refer to FIG. 24 for values of the
aspherical parameters.
[0163] The third lens element 630 may have negative refractive
power, which may be constructed by plastic material, and may
comprise an object-side curved surface 631, which has a concave
portion 6311 in a vicinity of the optical axis and a concave
portion 6312 in a vicinity of a periphery of the third lens element
630, and an image-side curved surface 632, which has a concave
portion 6321 in a vicinity of the optical axis and a convex portion
6322 in a vicinity of a periphery of the third lens element 630.
The curved surface 631, 632 may both be aspherical surfaces defined
by the aspherical formula. Please refer to FIG. 24 for values of
the aspherical parameters.
[0164] The fourth lens element 640 may have positive refractive
power, which may be constructed by plastic material, and may
comprise a concave object-side curved surface 641 and a convex
image-side curved surface 642. The concave surface 641 and convex
surface 642 may both be aspherical surfaces defined by the
aspherical formula. Please refer to FIG. 24 for values of the
aspherical parameters.
[0165] The fifth lens element 650 may have negative refractive
power, which may be constructed by plastic material, and may
comprise an object-side curved surface 651, which has a convex
portion 6511 in a vicinity of the optical axis and a convex portion
6512 in a vicinity of a periphery of the fifth lens element 650,
and an image-side curved surface 652, which has a concave portion
6521 in a vicinity of the optical axis and a convex portion 6522 in
a vicinity of a periphery of the fifth lens element 650. The curved
surface 651, 652 may both be gull wing surfaces of aspherical
surfaces defined by the aspherical formula. Please refer to FIG. 24
for values of the aspherical parameters.
[0166] In the present embodiment, for comparison, similar to the
first embodiment, air gaps may exist between the lens elements 610,
620, 630, 640, 650, the filtering unit 660, and the image plane 670
of the image sensor. Please refer to the positions of the air gaps
d1, d2, d3, d4, d5, d6 marked in the first embodiment, wherein the
sum of the air gaps d1, d2, d3, d4 is Gaa.
[0167] One difference between the sixth embodiment and the first
embodiment is that the central thickness of lens T2 of the second
lens element 620 and the central thickness of lens T3 of the third
lens element 630 may be different. In this regard, the sum of all
air gaps Gaa from the first lens element 610 to the fifth lens
element 650 may be different.
[0168] As illustrated in FIG. 25, it is clear that the optical
imaging lens of the present embodiment may show great
characteristics in longitudinal spherical aberration (a),
astigmatism in the sagittal direction (b), astigmatism in the
tangential direction (c), or distortion aberration (d). Therefore,
according to above illustration, the optical imaging lens of the
present embodiment indeed achieves great optical performance, and
the length of the optical imaging lens is effectively
shortened.
[0169] Reference is now made to FIGS. 26-29. FIG. 26 illustrates an
example cross-sectional view of an optical imaging lens having five
lens elements of the optical imaging lens according to a seventh
example embodiment. FIG. 27 shows an example table of optical data
of each lens element of the optical imaging lens according to the
seventh example embodiment. FIG. 28 shows an example table of
aspherical data of the optical imaging lens according to the
seventh example embodiment. FIG. 29 shows example charts of
longitudinal spherical aberration and other kinds of optical
aberrations of the optical imaging lens according to the seventh
example embodiment.
[0170] As shown in FIG. 26, the optical imaging lens of the present
embodiment, in an order from an object side A1 to an image side A2,
comprises an aperture stop 700 positioned between the object side
and a first lens element 710, the first lens element 710, a second
lens element 720, a third lens element 730, a fourth lens element
740, and a fifth lens element 750. Both of a filtering unit 760 and
an image plane 770 of an image sensor may be positioned at the
image side A2 of the optical imaging lens. Here an example
embodiment of filtering unit 760 may comprise an IR cut filter,
which is positioned between the image-side curved surface 752 of
the fifth lens element 750 and the image plane 770 to filter out
light with specific wavelength from the light passing optical
imaging lens. For example, IR light is filtered out, and this may
prohibit the IR light which is not seen by human eyes from
producing an image on image plane 770.
[0171] Please refer to FIG. 27 for the optical characteristics of
each lens elements in the optical imaging lens of the present
embodiment, wherein The values of T2, T3, T2/Gaa and T3/Gaa
are:
[0172] T2=0.21999 (mm), satisfying equations (1), (1');
[0173] T2/Gaa=0.28974, satisfying equations (2), (2');
[0174] T3=0.26816 (mm), satisfying equations (3), (3');
[0175] T3/Gaa=0.35319, satisfying equations (4), (4');
[0176] wherein the distance from the object side of the first lens
element to the image side of the fifth lens element is 3.59439
(mm), and the length of the optical imaging lens is shortened.
[0177] Example embodiments of the lens elements of the optical
imaging lens may comprise the following example embodiments:
[0178] The first lens element 710 may have positive refractive
power, which may be constructed by plastic material, and may
comprise a convex object-side curved surface 711 and a concave
image-side curved surface 712. The surfaces 711 and 712 may both be
aspherical surfaces defined by the aspherical formula. Please refer
to FIG. 28 for values of the aspherical parameters.
[0179] The second lens element 720 may have negative refractive
power, which may be constructed by plastic material, and may
comprise an object-side curved surface 721, which has a convex
portion 7211 in a vicinity of the optical axis and a convex portion
7212 in a vicinity of a periphery of the second lens element 720,
and a concave image-side curved surface 722. The curved surface 721
and concave surface 722 may both be aspherical surfaces defined by
the aspherical formula. Please refer to FIG. 28 for values of the
aspherical parameters.
[0180] The third lens element 730 may have negative refractive
power, which may be constructed by plastic material, and may
comprise an object-side curved surface 731, which has a concave
portion 7311 in a vicinity of the optical axis and a concave
portion 7312 in a vicinity of a periphery of the third lens element
730, and an image-side curved surface 732, which has a convex
portion 7321 in a vicinity of the optical axis and a convex portion
7322 in a vicinity of a periphery of the third lens element 730.
The curved surfaces 731, 732 may both be aspherical surfaces
defined by the aspherical formula. Please refer to FIG. 28 for
values of the aspherical parameters.
[0181] The fourth lens element 740 may have positive refractive
power, which may be constructed by plastic material, and may
comprise a concave object-side curved surface 741 and a convex
image-side curved surface 742. The concave surface 741 and convex
surface 742 may both be aspherical surfaces defined by the
aspherical formula. Please refer to FIG. 28 for values of the
aspherical parameters.
[0182] The fifth lens element 750 may have negative refractive
power, which may be constructed by plastic material, and may
comprise an object-side curved surface 751, which has a convex
portion 7511 in a vicinity of the optical axis and a convex portion
7512 in a vicinity of a periphery of the fifth lens element 750,
and an image-side curved surface 752, which has a concave portion
7521 in a vicinity of the optical axis and a convex portion 7522 in
a vicinity of a periphery of the fifth lens element 750. The curved
surfaces 751, 752 may both be gull wing surfaces of aspherical
surfaces defined by the aspherical formula. Please refer to FIG. 28
for values of the aspherical parameters.
[0183] In the present embodiment, for comparison, similar to the
first embodiment, air gaps may exist between the lens elements 710,
720, 730, 740, 750, the filtering unit 760, and the image plane 770
of the image sensor. Please refer to the positions of the air gaps
d1, d2, d3, d4, d5, d6 marked in the first embodiment, wherein the
sum of the air gaps d1, d2, d3, d4 is Gaa.
[0184] One difference between the seventh embodiment and the first
embodiment is the central thickness of lens T2 of the second lens
element 720 and the central thickness of lens T3 of the third lens
element 730 may be different. In this regard, the sum of all air
gaps Gaa from the first lens element 710 to the fifth lens element
750 may be different.
[0185] As illustrated in FIG. 29, it is clear that the optical
imaging lens of the present embodiment may show great
characteristics in longitudinal spherical aberration (a),
astigmatism in the sagittal direction (b), astigmatism in the
tangential direction (c), or distortion aberration (d). Therefore,
according to above illustration, the optical imaging lens of the
present embodiment indeed achieves great optical performance, and
the length of the optical imaging lens is effectively
shortened.
[0186] Please refer to FIG. 30, which shows the values of T2, T3,
T2/Gaa and T3/Gaa of all seven embodiments. As shown, this table
provides a clear illustration that the optical imaging lens of
example embodiments indeed satisfies the equations (1), (2), (3),
(4), (1'), (2'), (3'), and (4').
[0187] Reference is now made to FIGS. 31-32. FIG. 31 illustrates an
example structural view of an example embodiment of mobile device
1. FIG. 32 shows an example enlarged view of the example embodiment
of mobile device 1 of FIG. 31. An example of the mobile device 1
may be a mobile phone, but the type of the mobile device 1 should
not be limited to such. As shown, the mobile device 1 may comprise
a housing 10 and an optical imaging lens assembly 20 positioned in
the housing 10. The housing 10 protects the optical imaging lens
assembly 20 therein, and is not limited to any shape or material.
The optical imaging lens assembly 20 may comprise a lens barrel 21,
an optical imaging lens 22, a module housing unit 23, and an image
sensor 171 which is positioned at an image side of the optical
imaging lens 22. In example embodiments, any optical imaging lens
may be used as the optical imaging lens 22, such as any optical
imaging lens disclosed in the aforesaid embodiments or other
optical imaging lens according to example embodiments. However, for
clearly illustrating the present embodiment, the optical imaging
lens of the first embodiment will be used as the optical imaging
lens 22. When using other optical imaging lens 22, the structure of
the filtering unit 160 may be omitted. Furthermore, the housing 10,
the lens barrel 21, and/or the module housing unit 23 may be
integrated into a single component or assembled by multiple
components. Furthermore, the image sensor 171 used in the present
embodiment is directly attached on the substrate 172 in the form of
a chip on board (COB) package, and such package is different from
traditional chip scale packages (CSP) since it does not require a
cover glass. That is, no cover glass is required before the image
sensor 171 in the optical imaging lens 22. It should be noted,
however, that example embodiments are not limited to this package
type. The optical imaging lens with refractive power as a whole
comprises five lens elements 110, 120, 130, 140, 150 positioned in
the lens barrel 21, wherein an air gap may exist between any two
adjacent lens elements. The module housing unit 23 is provided for
positioning the optical imaging lens 22 thereon, and preferably
comprises an image sensor base 233 and an auto focus module 234.
The image sensor base 233 may be fixed on the substrate 172, and
the auto focus module 234 may comprise a lens seat 2341 for
positioning the optical imaging lens 22. The lens seat 2341 may be
capable of moving back and forth along the optical axis to control
the focusing of the optical imaging lens 22. For example, according
to the distance of the object, the optical imaging lens 22 may be
moved back and forth until the image focuses on the image plane 170
of the image sensor 171. Because the length of the optical imaging
lens 22 is merely 3.75436 (mm), the size of the mobile device 1 may
be quite small with good optical characters. Therefore, the present
embodiment meets the demand of smaller sized product design and the
request of the market.
[0188] Reference is now made to FIG. 33, which shows a structural
view of an example embodiment of mobile device 2. Here the housing
is not shown, and only the optical imaging lens assembly 20 is
shown. As shown, one difference between the mobile device 2 and the
mobile device 1 may be the structure of the module housing unit 24.
The module housing unit 24 may comprise an image sensor base 243
and an auto focus module 244, which may comprise a voice coil motor
(VCM) comprising a lens seat 2441, a magnet 2442 and a coil 2443.
With the magnetic force produced by the magnet 2442 and the coil
2443, the VCM may move the lens seat 2441 slightly to move the lens
seat 2441 back and forth along an optical axis to focus the optical
imaging lens 22. Because the length of the optical imaging lens 22
may be shortened, the mobile device 2 may be designed with a
smaller size and meanwhile good optical performance is still
provided. Therefore, the present embodiment meets the demand of
small sized product design and the request of the market.
[0189] According to above illustration, it is clear that the mobile
device and the optical imaging lens thereof in example embodiments,
through controlling ratio of at least one central thickness of lens
to a sum of all air gaps along the optical axis between five lens
elements in a predetermined range, and incorporated with detail
structure and/or reflection power of the lens elements, the lengths
of the optical imaging lens is effectively shortened and meanwhile
good optical characters are still provided.
[0190] While various embodiments in accordance with the disclosed
principles have been described above, it should be understood that
they have been 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.
[0191] 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.
* * * * *