U.S. patent application number 15/810043 was filed with the patent office on 2019-05-16 for optical wheel.
The applicant listed for this patent is Taiwan color optics, Inc.. Invention is credited to YUNG-PENG CHANG, CHIH-FENG WANG.
Application Number | 20190146207 15/810043 |
Document ID | / |
Family ID | 66433224 |
Filed Date | 2019-05-16 |
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United States Patent
Application |
20190146207 |
Kind Code |
A1 |
WANG; CHIH-FENG ; et
al. |
May 16, 2019 |
OPTICAL WHEEL
Abstract
The instant disclosure provides an optical wheel including a
rotary light-transmittable substrate, an optical microstructure
layer and an optical coating layer. The rotary light-transmittable
substrate has a first surface and a second surface opposite to the
first surface, and rotates around a central axis. The optical
microstructure is disposed on the first surface or the second
surface. The optical coating layer is disposed on the optical
microstructure. At least a laser incident light beam is projected
onto the first surface or the second surface of the rotary
light-transmittable substrate for forming a laser emission light
beam emitted from the second surface.
Inventors: |
WANG; CHIH-FENG; (Taichung
City, TW) ; CHANG; YUNG-PENG; (Kaohsiung City,
TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Taiwan color optics, Inc. |
Taichung City |
|
TW |
|
|
Family ID: |
66433224 |
Appl. No.: |
15/810043 |
Filed: |
November 11, 2017 |
Current U.S.
Class: |
359/524 |
Current CPC
Class: |
G02B 5/0294 20130101;
G03B 21/208 20130101; H04N 9/3114 20130101; H04N 9/3161 20130101;
G02B 26/008 20130101; G03B 33/10 20130101; G02B 27/0905 20130101;
G03B 21/2033 20130101; G02B 27/48 20130101 |
International
Class: |
G02B 26/00 20060101
G02B026/00; G02B 27/09 20060101 G02B027/09; H04N 9/31 20060101
H04N009/31 |
Claims
1. An optical wheel, comprising: a rotary light-transmittable
substrate having a first surface and a second surface opposite to
the first surface; an optical microstructure layer disposed on the
first surface or the second surface, wherein the optical
microstructure layer and the rotary light-transmittable substrate
are made of the same material and a roughness of the optical
microstructure layer ranges from 0.01 to 1 .mu.m; and an optical
coating layer disposed on the optical microstructure layer; wherein
at least one laser incident light beam is projected onto the first
surface or the second surface of the rotary light-transmittable
substrate and passes through the optical microstructure layer for
forming at least one laser emission light beam emitted from the
second surface.
2. The optical wheel according to claim 1, wherein the optical
wheel comprises a plurality of laser incident light beams projected
onto the first surface or the second surface of the rotary
light-transmittable substrate for forming a plurality of laser
emission light beams emitted from the second surface.
3. The optical wheel according to claim 2, wherein the plurality of
laser incident light beams include a laser incident light beam
having a wavelength ranging from 450 to 495 nanometers, a laser
incident light beam having a wavelength ranging from 495 to 570
nanometers and a laser incident light beam having a wavelength
ranging from 620 to 750 nanometers.
4. The optical wheel according to claim 2, wherein all of the
plurality of laser incident light beams are projected onto the
first surface of the rotary light-transmittable substrate for
forming the plurality of laser emission light beams emitted from
the second surface.
5. The optical wheel according to claim 2, wherein all of the
plurality of laser incident light beams are projected onto the
second surface of the rotary light-transmittable substrate for
forming the plurality of laser emission light beams emitted from
the second surface.
6. The optical wheel according to claim 2, wherein one of the laser
incident light beams is projected onto the first surface of the
rotary light-transmittable substrate for forming one of the
plurality of laser emission light beams emitted from the second
surface, and another one of the laser incident light beams is
projected onto the second surface of the rotary light-transmittable
substrate for forming another one of the plurality of laser
emission light beams emitted from the second surface.
7. (canceled)
8. (canceled)
9. The optical wheel according to claim 1, wherein the optical
microstructure layer is disposed on the first surface and the
second surface.
Description
BACKGROUND
1. Technical Field
[0001] The instant disclosure relates to an optical wheel, and in
particular, to an optical wheel suitable for a projector.
2. Description of Related Art
[0002] One of the characteristics of a projector is that a fixed
screen is not required, and hence, the size of an image displayed
by the projector is not limited. As long as a plane for projecting
images is presented, the projector can project an image with a
large size. Therefore, projectors are widely used in many
applications such as conference venues, meeting rooms or home
theaters.
[0003] However, the images projected by the projectors in the
existing art include color speckles which reduce the image quality
of the image.
[0004] Accordingly, there is a need for providing an optical wheel
which can perform light mixing of lasers having different
wavelengths and eliminate the speckles for overcoming the above
problems.
SUMMARY
[0005] The main object of the instant disclosure is to provide an
optical wheel for overcoming the above technical problems.
[0006] An embodiment of the instant disclosure provides an optical
wheel including a rotary light-transmittable substrate, an optical
microstructure layer and an optical coating layer. The rotary
light-transmittable substrate has a first surface and a second
surface opposite to the first surface. The optical microstructure
layer is disposed on the first surface or the second surface. The
optical coating layer is disposed on the optical microstructure
layer. At least one laser incident light beam is projected onto the
first surface or the second surface of the rotary
light-transmittable substrate for forming a laser emission light
beam emitted from the second surface.
[0007] The advantage of the instant disclosure is that the optical
wheel provided by the embodiments of the instant disclosure can
achieve the object of laser light mixing and speckles elimination
by the technical feature of "the optical microstructure layer is
disposed on the first surface or the second surface of the rotary
light-transmittable substrate".
[0008] In order to further understand the techniques, means and
effects of the instant disclosure, the following detailed
descriptions and appended drawings are hereby referred to, such
that, and through which, the purposes, features and aspects of the
instant disclosure can be thoroughly and concretely appreciated;
however, the appended drawings are merely provided for reference
and illustration, without any intention to be used for limiting the
instant disclosure.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The accompanying drawings are included to provide a further
understanding of the instant disclosure, and are incorporated in
and constitute a part of this specification. The drawings
illustrate exemplary embodiments of the instant disclosure and,
together with the description, serve to explain the principles of
the instant disclosure.
[0010] FIG. 1 is a three-dimensional exploded schematic view of an
optical wheel of the first embodiment of the instant disclosure and
a rotation unit;
[0011] FIG. 2 is a three-dimensional assembly schematic view of the
optical wheel of the first embodiment of the instant disclosure and
the rotation unit;
[0012] FIG. 3 is a top schematic view of the optical wheel of the
first embodiment of the instant disclosure;
[0013] FIG. 4 is a side sectional schematic view of the optical
wheel of the first embodiment of the instant disclosure;
[0014] FIG. 5 is a partial sectional enlarged schematic view of the
optical wheel of the first embodiment of the instant
disclosure;
[0015] FIG. 6 is a schematic view of one of the laser light paths
of the optical wheel of the first embodiment of the instant
disclosure;
[0016] FIG. 7 is a schematic view of another laser light paths of
the optical wheel of the first embodiment of the instant
disclosure;
[0017] FIG. 8 is a schematic view of yet another laser light paths
of the optical wheel of the first embodiment of the instant
disclosure;
[0018] FIG. 9 is a schematic view of one of the laser light paths
of the optical wheel of the second embodiment of the instant
disclosure;
[0019] FIG. 10 is a schematic view of another laser light paths of
the optical wheel of the second embodiment of the instant
disclosure;
[0020] FIG. 11 is a schematic view of yet another laser light paths
of the optical wheel of the second embodiment of the instant
disclosure;
[0021] FIG. 12 is a partial enlarged view of a side sectional
schematic view of an optical wheel of the third embodiment of the
instant disclosure; and
[0022] FIG. 13 is a partial enlarged view of a side sectional
schematic view of an optical wheel of the fourth embodiment of the
instant disclosure.
DESCRIPTION OF THE EXEMPLARY EMBODIMENTS
[0023] Reference will now be made in detail to the exemplary
embodiments of the instant disclosure, examples of which are
illustrated in the accompanying drawings. Wherever possible, the
same reference numbers are used in the drawings and the description
to refer to the same or like parts.
First Embodiment
[0024] Reference is made to FIG. 1 to FIG. 3. The first embodiment
of the instant disclosure provides an optical wheel Q for a
projecting device (not shown). The optical wheel Q can be driven by
a rotation unit D (such as a motor) to rotate around a central axis
C. Therefore, one or a plurality of laser incident light beam(s)
can be projected onto the optical wheel Q, and the optical
microstructure layer M disposed on the optical wheel Q (as shown in
FIG. 4 to FIG. 7) can eliminate the color speckles generated by the
laser incident light beam(s).
[0025] Reference is made to FIG. 4 and FIG. 5. It should be noted
that in order to illustrate the relationship between the rotary
light-transmittable substrate 1, the optical microstructure layer M
and the optical coating layer 2, these figures are not depicted in
actual proportion. Specifically, the optical wheel Q includes a
rotary light-transmittable substrate 1, an optical microstructure
layer M and an optical coating layer 2. The rotary
light-transmittable substrate 1 has a body 11, a first surface 12
(an upper surface) on the rotary light-transmittable substrate 1
and a second surface 13 (a lower surface) on the rotary
light-transmittable substrate 1 and opposite to the first surface
12. The rotary light-transmittable substrate 1 is capable of
rotating around a central axis C. In addition, the rotary
light-transmittable substrate 1 can be made of light-transparent
materials such as glass materials. The glass materials can be a
silicate-based, a phosphate-based, a borate-based or a
tellurate-based glass material. It should be noted that in order to
maintain the balance of the rotary light-transmittable substrate 1
while rotating, the rotary light-transmittable substrate 1 is
substantially a flat disc with the shape of a right-circle.
However, the instant disclosure is not limited thereto.
[0026] As shown in FIG. 5, the optical microstructure layer M can
be disposed on the first surface 12 or the second surface 13 and at
least cover 10% to 100% of the surface area of the first surface 12
or 10% to 100% of the surface area of the second surface 13. In the
embodiment shown in FIG. 5, the optical coating layer 2 of the
optical microstructure layer M is disposed on the first surface 12
of the rotary light-transmittable substrate 1. However, the instant
disclosure is not limited thereto. It should be noted that the
optical microstructure layer M can have a surface with projections,
an uneven surface, a recessed surface, a surface with particulates
or a matte surface by grinding, casting, printing, etching,
sandblasting, matting or mold pressing processes. However, the
instant disclosure is not limited thereto. In other words, the
optical microstructure layer M produced by grinding, casting,
printing, etching, sandblasting, matting or mold pressing processes
has a material same as that of the rotary light-transmittable
substrate 1. In addition, in order to achieve a better
speckles-eliminating performance, the optical microstructure layer
M has a roughness ranging from 0.01 micrometer (.mu.m) to 1
micrometer.
[0027] As shown in FIG. 5, the optical coating layer 2 is disposed
on the optical microstructure layer M and at least covers 10% to
100% of the surface area of the first surface 12 or 10% to 100% of
the surface area of the second surface 13. It should be noted that
the optical coating layer 2 can have a single-layer, a double-layer
or a multi-layer structure. In addition, the optical coating layer
2 can be an anti-reflection coating or a high-reflection coating.
Therefore, the one or plurality of laser incident light beam(s)
projected onto the optical wheel Q can pass through the optical
wheel Q by the optical coating layer 2 or be reflected by the
optical wheel Q through the optical coating layer 2. It should be
noted that although the optical microstructure layer M in the first
embodiment shown in FIG. 5 is disposed on the first surface 12 of
the rotary light-transmittable substrate 1 and the optical coating
layer 2 is disposed on the optical microstructure layer M, the
optical microstructure layer M and the optical coating layer 2 in
other embodiments can be disposed on the second surface 13 of the
rotary light-transmittable substrate 1.
[0028] Specifically, one or a plurality of laser incident light
beam(s) can be projected onto the first surface 12 or the second
surface 13 of the rotary light-transmittable substrate 1 for
forming one or a plurality of laser emission light beam(s) emitted
from the second surface 13. In other words, when the optical wheel
Q includes a plurality of laser incident light beams, the laser
incident light beams can form the plurality of laser emission light
beams emitted from the second surface by projecting onto one of the
first surface 12 and the second surface 13. The laser incident
light beam emitted from the second surface 13 can be generated no
matter the laser incident light beams are projected on the first
surface 12 or the second surface 13, i.e., the projecting direction
of the laser incident light beams are the same and these laser
incident light beams are projected from the same surface.
Specifically, the optical coating layer 2 can decide whether the
laser incident light beams pass through the optical wheel Q or are
reflected by the optical wheel Q.
[0029] As shown in FIG. 6, the laser incident light beams are
projected onto the first surface 12. However, in other embodiments,
the laser incident light beams can be projected onto the second
surface 13. In addition, in the first embodiment of the instant
disclosure, at least one of the laser incident light beams is
preferably a blue laser incident light beam having a wavelength
ranging from 450 nanometers to 495 nanometers. It should be noted
that the following descriptions are provided as an example in which
the plurality of laser incident light beams are projected on the
optical wheel Q. In the embodiment shown in FIG. 6, the plurality
of laser light beams are projected onto the first surface 12 of the
rotary light-transmittable substrate 1 for forming a plurality of
laser emission light beams emitted from the second surface 13. In
addition, the plurality of laser incident light beams can further
include a laser incident light beam having a wavelength ranging
from 495 nm to 570 nm and a laser incident light beam having a
wavelength ranging from 620 nm to 750 nm. In other words, the
plurality of laser incident light beams can include a blue laser
incident light beam, a green laser incident light beam and a red
laser incident light beam.
[0030] As shown in FIG. 6, the plurality of laser incident light
beams can include a first laser incident light beam L1, a second
laser incident light beam L2 and a third laser incident light beam
L3. For example, the first laser incident light beam L1 is
projected onto the first surface 12 of the rotary
light-transmittable substrate 1 for forming a first laser emission
light beam R1 emitted from the second surface 13. The second laser
incident light beam L2 is projected onto the first surface 12 of
the rotary light-transmittable substrate 1 for forming a second
laser emission light beam R2 emitted from the second surface 13.
The third laser incident light beam L3 is projected onto the first
surface 12 of the rotary light-transmittable substrate 1 for
forming a third laser emission light beam R3 emitted from the
second surface 13. In other words, the first surface 12 is the
incident surface of the optical wheel Q and the second surface 13
is the outputting (emitting) surface of the optical wheel Q. It
should be noted that in other embodiments, the first laser incident
light beam L1, the second laser incident light beam L2 and the
third laser incident light beam L3 can be projected onto the second
surface 13 of the rotary light-transmittable substrate 1 for
forming the first laser emission light beam R1, the second laser
emission light beam R2 and the third laser emission light beam R3
emitted from the second surface 13. In addition, for example, the
first laser incident light beam L1 has a wavelength ranging from
450 to 495 nm, the second laser incident light beam L2 has a
wavelength ranging from 495 to 570 nm, and the third laser incident
light beam L3 has a wavelength ranging from 620 to 750 nm. However,
the instant disclosure is not limited thereto.
[0031] In the embodiment shown in FIG. 6, the optical coating layer
2 can be an anti-reflection film and the plurality of laser
incident light beams (the first laser incident light beam L1, the
second laser incident light beam L2 and the third laser incident
light beam L3) are projected onto the first surface 12 of the
rotary light-transmittable substrate 1 for forming the plurality of
emission light beams (the first laser emission light beam R1, the
second laser emission light beam R2 and the third laser emission
light beam R3) emitted from the second surface 13 respectively.
Therefore, the first laser incident light beam L1, the second laser
incident light beam L2 and the third laser incident light beam L3
can pass through the optical coating layer 2, the optical
microstructure layer M, the first surface 12 of the rotary
light-transmittable substrate 1, the body 11 of the rotary
light-transmittable substrate 1 and the second surface 13 of the
rotary light-transmittable substrate 1 sequentially and form the
first laser emission light beam R1, the second laser emission light
beam R2 and the third laser emission light beam R3 emitted from the
second surface 13. It should be noted that in the instant
embodiment, in order to increase the light-mixing and
speckles-eliminating effects of the first laser incident light beam
L1, the second laser incident light beam L2 and the third laser
incident light beam L3 after passing the optical wheel Q, the
optical microstructure layer M has a roughness ranging from 0.01 to
1 .mu.m, and the optical coating layer 2 has a reflectivity ranging
from 1.2 to 1.9.
[0032] Reference is made to FIG. 7. In the embodiment shown in FIG.
7, the plurality of laser incident light beams (the first laser
incident light beam L1, the second laser incident light beam L2 and
the third laser incident light beam L3) are projected onto the
second surface 13 of the rotary light-transmittable substrate 1 for
forming a plurality of laser emission light beams (the first laser
emission light beam R1 the second laser emission light beam R2 and
the third laser emission light beam R3) emitted from the second
surface 13. In addition, the optical coating layer 2 can be a high
reflectance film, and the plurality of laser incident light beams
can be reflected from the second surface 13 under the consideration
of the overall structure design of the projector. In other words,
the plurality of laser incident light beams can pass through the
second surface 13 of the rotary light-transmittable substrate 1,
the body 11 of the rotary light-transmittable substrate 1, the
first surface 12 of the rotary light-transmittable substrate 1, the
optical microstructure layer M and the optical coating layer 2
sequentially and be reflected by the optical coating layer 2 for
emitting from the second surface 13 of the rotary
light-transmittable substrate 1. It should be noted that in the
present embodiment, in order to increase the light-mixing and
speckles-eliminating effects of the first laser incident light beam
L1, the second laser incident light beam L2 and the third laser
incident light beam L3 after passing the optical wheel Q, the
optical microstructure layer M has a roughness ranging from 0.01 to
1 .mu.m, and the optical coating layer 2 has a reflectivity ranging
from 1.2 to 1.9.
[0033] Reference is made to FIG. 8. In the embodiment shown in FIG.
8, one of the laser incident light beams is projected onto the
first surface 12 of the rotary light-transmittable substrate 1 for
forming one of the laser emission light beams emitted from the
second surface 13. Another one of the laser incident light beams is
projected onto the second surface 13 of the rotary
light-transmittable substrate 1 for forming another one of the
laser emission light beams emitted from the second surface 13. In
other words, based on the material selection of the optical coating
layer 2, a part of the laser incident light beams can pass through
the second surface 13 and be emitted away from the second surface
13, and another part of the laser incident light beam can be
reflected by the second surface 13 and travel away from the second
surface 13.
[0034] Specifically, as shown in FIG. 8, the second laser incident
light beam L2 and the third laser incident light beam L3 can pass
through the optical coating layer 2, the optical microstructure
layer M, the first surface 12 of the rotary light-transmittable
substrate 1, the body 11 of the rotary light-transmittable
substrate 1 and the second surface 13 of the rotary
light-transmittable substrate 1 sequentially for forming the second
laser emission light beam R2 and the third laser emission light
beam R3 emitted from the second surface 13. The first laser
incident light beam L1 can project onto the second surface 13 of
the rotary light-transmittable substrate 1 and pass through the
body 11 of the rotary light-transmittable substrate 1, the first
surface 12 of the rotary light-transmittable substrate 1, the
optical microstructure layer M and the optical coating layer 2
sequentially, then be reflected by the optical coating layer 2 and
emit from the second surface 13 of the rotary light-transmittable
substrate 1. In other words, the optical coating layer 2 has a
transmittance which enables the second laser incident light beam L2
and the third laser incident light beam L3 to transmit, and a
reflectivity for reflecting the first laser incident light beam
L1.
Second Embodiment
[0035] Reference is made to FIG. 9. Comparing FIG. 9 to FIG. 6, the
main difference between the optical wheel Q of the second
embodiment and the optical wheel Q of the first embodiment is that
the optical wheel Q of the second embodiment has an optical
microstructure layer M and an optical coating layer 2 disposed on
the second surface 13 of the rotary light-transmittable substrate
1. It should be noted that the structural features of the optical
wheel Q provided in the second embodiment are similar to that of
the first embodiment and are not reiterated herein. The projecting
paths of the plurality of laser incident light beams are described
in detail below.
[0036] As shown in FIG. 9, for example, the optical coating layer 2
can be an anti-reflection film. Therefore, the plurality of laser
incident light beams (the first laser incident light beam L1, the
second laser incident light beam L2, and the third laser incident
light beam L3) can sequentially pass through the second surface 13
of the rotary light-transmittable substrate 1, the body 11 of the
rotary light-transmittable substrate 1, the first surface 12 of the
rotary light-transmittable substrate 1, the optical microstructure
layer M and the optical coating layer 2 for forming the plurality
of laser emission light beams emitted from the second surface 13
(the first laser emission light beam R1, the second laser emission
light beam R2 and the third laser emission light beam R3). It
should be noted that in the present embodiment, in order to
increase the light-mixing and speckles-eliminating effects of the
first laser incident light beam L1, the second laser incident light
beam L2 and the third laser incident light beam L3 after passing
the optical wheel Q, the optical microstructure layer M has a
roughness ranging from 0.01 to 1 .mu.m, and the optical coating
layer 2 has a reflectivity ranging from 1.2 to 1.9.
[0037] Reference is made to FIG. 10. For example, the optical
coating layer 2 is a high reflectance film, and hence, the
plurality of laser incident light beams (the first laser incident
light beam L1, the second laser incident light beam L2 and the
third laser incident light beam L3) can be reflected by the optical
coating layer 2 and emit from the second surface 13 of the rotary
light-transmittable substrate 1 for forming the plurality of laser
emission light beams (the first laser emission light beam R1, the
second laser emission light beam R2 and the third laser emission
light beam R3).
[0038] Reference is made to FIG. 11. In the embodiment shown in
FIG. 11, the optical coating layer 2 can have a transmittance which
enables the second laser incident light beam L2 and the third laser
incident light beam L3 to pass through, and a reflectivity which
enables the optical coating layer 2 to reflect the first laser
incident light beam L1. Therefore, the second laser incident light
beam L2 and the third laser incident light beam L3 can pass through
the first surface 12 of the rotary light-transmittable substrate 1,
the body 11 of the rotary light-transmittable substrate 1, the
second surface 13 of the rotary light-transmittable substrate 1,
the optical microstructure layer M and the optical coating layer 2
sequentially for forming the second laser emission light beam R2
and the third laser emission light beam R3 emitted from the second
surface 13. In addition, the first laser incident light beam L1 can
be projected onto the optical coating layer 2 and reflected by the
optical coating layer 2, then emit from the second surface 13 of
the rotary light-transmittable substrate 1.
Third Embodiment
[0039] Reference is made to FIG. 12. Comparing FIG. 12 and FIG. 5,
the main difference between the optical wheel Q provided by the
third embodiment and the optical wheel Q provided by the first
embodiment is that the optical wheel Q provided by the third
embodiment further includes an optical coating layer 2 disposed on
the second surface 13 of the rotary light-transmittable substrate
1. Therefore, the light-mixing effect of the plurality of laser
incident light beams can be changed.
[0040] In addition, it should be noted that the projecting paths of
the plurality of laser incident light beams related to the optical
coating layer 2 of the third embodiment are similar to that
described in the first and second embodiments, and are not
reiterated herein.
Fourth Embodiment
[0041] Reference is made to FIG. 13. Comparing FIG. 13 to FIG. 5,
the main difference between the optical wheel Q provided by the
fourth embodiment and the optical wheel Q provided by the first
embodiment is that the optical wheel Q of the fourth embodiment
further includes an optical microstructure layer M disposed on the
second surface 13 of the rotary light-transmittable substrate 1 and
an optical coating layer 2 disposed on the optical microstructure
layer M. Therefore, the optical microstructure layer M disposed on
the second surface 13 of the rotary light-transmittable substrate 1
and the optical coating layer 2 disposed on the optical
microstructure layer M can further change the light-mixing effect
of the plurality of laser incident light beams.
[0042] In addition, it should be noted that the projecting paths of
the plurality of laser incident light beams related to the optical
coating layer 2 of the fourth embodiment are similar to that
described in the first and second embodiments, and are not
reiterated herein.
[0043] In summary, the advantage of the instant disclosure is that
the use of "the optical microstructure layer M" of the optical
wheel Q provided by the embodiments of the instant disclosure can
achieve the effect of light-mixing and eliminate the speckles.
[0044] The above-mentioned descriptions represent merely the
exemplary embodiment of the present disclosure, without any
intention to limit the scope of the instant disclosure thereto.
Various equivalent changes, alterations or modifications based on
the claims of the instant disclosure are all consequently viewed as
being embraced by the scope of the instant disclosure.
* * * * *