U.S. patent application number 15/729678 was filed with the patent office on 2019-04-11 for light combining module.
This patent application is currently assigned to Young Optics Inc.. The applicant listed for this patent is Young Optics Inc.. Invention is credited to Yu-Chen Chang, Yi-Hsueh Chen, Chi-Chui Yun.
Application Number | 20190107772 15/729678 |
Document ID | / |
Family ID | 65993173 |
Filed Date | 2019-04-11 |
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United States Patent
Application |
20190107772 |
Kind Code |
A1 |
Chang; Yu-Chen ; et
al. |
April 11, 2019 |
LIGHT COMBINING MODULE
Abstract
A light combining module includes a first light source, a second
light source, a first dichroic mirror, and a first alignment
structure. The first light source is used to output a first light.
The second light source is used to output a second light. The first
dichroic mirror is disposed on a transmission path of the first
light and the second light, wherein the first light is incident on
the second light source via the first dichroic mirror. The first
alignment structure adjusts the position of the second light
source.
Inventors: |
Chang; Yu-Chen; (Hsinchu,
TW) ; Yun; Chi-Chui; (Hsinchu, TW) ; Chen;
Yi-Hsueh; (Hsinchu, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Young Optics Inc. |
Hsinchu |
|
TW |
|
|
Assignee: |
Young Optics Inc.
Hsinchu
TW
|
Family ID: |
65993173 |
Appl. No.: |
15/729678 |
Filed: |
October 11, 2017 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G02B 27/141 20130101;
G03B 21/2046 20130101; G02B 27/102 20130101; G02B 27/145 20130101;
G03B 21/208 20130101; G03B 21/204 20130101; G03B 21/2066 20130101;
G03B 21/2013 20130101 |
International
Class: |
G03B 21/20 20060101
G03B021/20; G02B 27/14 20060101 G02B027/14 |
Claims
1. A light combining module, comprising: a first light source used
to output a first light; a second light source used to output a
second light; a first dichroic mirror disposed on a transmission
path of the first light and the second light, wherein the first
light is incident on the second light source via the first dichroic
mirror; and a first alignment structure adjusting a position of the
second light source.
2. The light combining module as recited in claim 1, wherein the
first light source comprises a blue light emitting diode disposed
on a first light source module, and the second light source
comprises a blue light emitting diode covered with an excitable
green fluorescent layer and disposed on a second light source
module.
3. The light combining module as recited in claim 2, wherein the
second light source module further comprises a collimating
lens.
4. The light combining module as recited in claim 3, wherein the
second light source module satisfies one of the following
conditions: (1) the second light source module is disposed on the
first alignment structure; and (2) the light combining module
further comprises a heat sink disposed on the first alignment
structure, and the second light source module is disposed on the
heat sink.
5. The light combining module as recited in claim 2, wherein the
first alignment structure comprises a plurality of first elastic
components and a first fastening component, the plurality of first
elastic components are positioned in a first direction, and the
first fastening component leans against the plurality of first
elastic components, so that the second light source module is moved
in the first direction.
6. The light combining module as recited in claim 5, wherein the
first alignment structure further comprises a plurality of second
elastic components and a second fastening component, the plurality
of second elastic components are positioned in a second direction,
and the second fastening component leans against the plurality of
second elastic components, so that the second light source module
is moved in the second direction that is different from the first
direction.
7. A light combining module, comprising: a first light source
module used to output a first blue light; a second light source
module used to output a green light; a third light source module
used to output a second blue light; a fourth light source module
used to output a red light; a first dichroic mirror disposed on a
transmission path of the first blue light, the second blue light,
and the green light, wherein the first blue light is incident on
the second light source module via the first dichroic mirror; a
second dichroic mirror disposed on a transmission path of the red
light, the second blue light, and the green light; and a first
alignment structure used to change a position where the first blue
light is incident on the second light source module.
8. The light combining module as recited in claim 7, wherein the
second light source module further comprises a collimating
lens.
9. The light combining module as recited in claim 8, wherein the
second light source module satisfies one of the following
conditions: (1) the second light source module is disposed on the
first alignment structure; and (2) the light combining module
further comprises a heat sink disposed on the first alignment
structure, and the second light source module is disposed on the
heat sink.
10. The light combining module as recited in claim 7, wherein the
second light source module further comprises a collimating lens,
and the first alignment structure is replaced by a second alignment
structure, wherein the second alignment structure comprises a base,
a bottom surface of the base has a sliding slot, and the first
dichroic mirror or the collimating lens has a locking member
slidably disposed inside the sliding slot.
11. The light combining module as recited in claim 10, wherein the
second alignment structure further comprises an upper cover, a top
surface of the upper cover has a position-limiting slot, and the
first dichroic mirror or the collimating lens has a
position-limiting member that protrudes above the position-limiting
slot of the upper cover.
12. The light combining module as recited in claim 7, wherein the
first alignment structure comprises a plurality of first elastic
components and a first fastening component, the plurality of first
elastic components are positioned in a first direction, and the
first fastening component leans against the plurality of first
elastic components, so that the second light source module is moved
in the first direction.
13. The light combining module as recited in claim 12, wherein the
first alignment structure further comprises a plurality of second
elastic components and a second fastening component, the plurality
of second elastic components are positioned in a second direction,
and the second fastening component leans against the plurality of
second elastic components, so that the second light source module
is moved in the second direction that is different from the first
direction.
14. The light combining module as recited in claim 7, wherein each
of the first light source module and the third light source module
is a blue light emitting diode, the second light source is a blue
light emitting diode covered with an excitable green fluorescent
layer, and the fourth light source module is a red light emitting
diode.
15. The light combining module as recited in claim 14, wherein the
second light source module further comprises a collimating
lens.
16. The light combining module as recited in claim 15, wherein the
second light source module satisfies one of the following
conditions: (1) the second light source module is disposed on the
first alignment structure; and (2) the light combining module
further comprises a heat sink disposed on the first alignment
structure, and the second light source module is disposed on the
heat sink.
17. The light combining module as recited in claim 14, wherein the
second light source module further comprises a collimating lens,
and the first alignment structure is replaced by a second alignment
structure, wherein the second alignment structure comprises a base,
a bottom surface of the base has a sliding slot, and the first
dichroic mirror or the collimating lens has a locking member
slidably disposed inside the sliding slot.
18. The light combining module as recited in claim 17, wherein the
second alignment structure further comprises an upper cover, a top
surface of the upper cover has a position-limiting slot, and the
first dichroic mirror or the collimating lens has a
position-limiting member that protrudes above the position-limiting
slot of the upper cover.
19. The light combining module as recited in claim 14, wherein the
first alignment structure comprises a plurality of first elastic
components and a first fastening component, the plurality of first
elastic components are positioned in a first direction, and the
first fastening component leans against the plurality of first
elastic components, so that the second light source module is moved
in the first direction.
20. The light combining module as recited in claim 19, wherein the
first alignment structure further comprises a plurality of second
elastic components and a second fastening component, the plurality
of second elastic components are positioned in a second direction,
and the second fastening component leans against the plurality of
second elastic components, so that the second light source module
is moved in the second direction that is different from the first
direction.
Description
BACKGROUND OF THE INVENTION
Field of the Invention
[0001] The invention relates to a light combining module and
particularly relates to a light combining module that has an
alignment structure.
Description of Related Art
[0002] In conventional projection modules, a projection light is
mostly generated by using a red light emitting diode (LED), a blue
LED, and a green LED. The brightness of the image projected by the
projection module depends on the brightness of the light output
from the light source module thereof. Consequently, how to further
effectively excite the green LED has become an urgent issue that
needs to be addressed in this field.
SUMMARY OF THE INVENTION
[0003] The embodiments of the invention provide a light combining
module that uses an alignment structure to adjust the position of a
light source module, the position of a dichroic mirror, or the
position of a collimating lens so as to enhance brightness
performance of the light combining module. The light combining
module thus provides higher brightness and good image quality
applicable to a projector.
[0004] In an embodiment of the invention, a light combining module
includes a first light source, a second light source, a first
dichroic mirror, and a first alignment structure. The first light
source is used to output a first light. The second light source is
used to output a second light. The first dichroic mirror is
disposed on a transmission path of the first light and the second
light, wherein the first light is incident on the second light
source via the first dichroic mirror. The first alignment structure
adjusts the position of the second light source.
[0005] In an embodiment of the invention, a light combining module
includes a first light source module, a second light source module,
a third light source module, a fourth light source module, a first
dichroic mirror, a second dichroic mirror, and a first alignment
structure. The first light source module is used to output a first
blue light. The second light source module is used to output a
green light. The third light source module is used to output a
second blue light. The fourth light source module is used to output
a red light. The first dichroic mirror is disposed on a
transmission path of the first blue light, the second blue light,
and the green light, wherein the first blue light is incident on
the second light source module via the first dichroic mirror. The
second dichroic mirror is disposed on a transmission path of the
red light, the second blue light, and the green light. The first
alignment structure is used to change a position where the first
blue light is incident on the second light source module.
[0006] Based on the above, in the embodiments of the invention,
since the light combining module is provided with the alignment
structure, the position of the light source, the position of the
dichroic mirror, or the position of the collimating lens may thus
be adjusted by such design of the alignment structure so as to
change the position where the light is incident on the light source
module, thereby achieving better excitation efficiency. In brief,
the light combining module in the embodiments of the invention may
produce higher brightness and good image quality applicable to a
projector.
[0007] To make the aforementioned and other features and advantages
of the invention more comprehensible, several embodiments
accompanied with drawings are described in detail as follows.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] The accompanying drawings are included to provide a further
understanding of the invention, and are incorporated in and
constitute a part of this specification. The drawings illustrate
exemplary embodiments of the invention and, together with the
description, serve to explain the principles of the invention.
[0009] FIG. 1 is a schematic view of a light combining module
according to an embodiment of the invention.
[0010] FIG. 2A is a schematic view of an alignment structure
according to an embodiment of the invention.
[0011] FIG. 2B is a schematic view illustrating a fastening
component of the alignment structure of FIG. 2A fastened in a Y
direction.
[0012] FIG. 2C is a schematic view illustrating the alignment
structure of FIG. 2A assembled with the light source module of FIG.
1.
[0013] FIG. 2D is a schematic view illustrating the alignment
structure of FIG. 2A assembled with the light source module and
collimating lens of FIG. 1.
[0014] FIG. 2E is a schematic view illustrating the alignment
structure of FIG. 2A assembled with a heat wink and with the light
source module and collimating lens of FIG. 1.
[0015] FIG. 3A is a schematic three-dimensional exploded view of an
alignment structure and the dichroic mirror and collimating lens of
FIG. 1 according to another embodiment of the invention.
[0016] FIG. 3B is a schematic top view of FIG. 3A.
[0017] FIG. 4A is a schematic three-dimensional exploded view of an
alignment structure and the dichroic mirror and collimating lens of
FIG. 1 according to another embodiment of the invention.
[0018] FIG. 4B is a schematic top view of FIG. 4A.
[0019] FIGS. 4C to 4D are schematic views illustrating the
alignment structure of FIG. 4A adjusting the position of the
dichroic mirror.
DESCRIPTION OF THE EMBODIMENTS
[0020] FIG. 1 is a schematic view of a light combining module
according to an embodiment of the invention. FIG. 2A is a schematic
view of an alignment structure according to an embodiment of the
invention. FIG. 2B is a schematic view illustrating a fastening
component of the alignment structure of FIG. 2A fastened in a Y
direction. FIG. 2C is a schematic view illustrating the alignment
structure of FIG. 2A assembled with the light source module of FIG.
1. FIG. 2D is a schematic view illustrating the alignment structure
of FIG. 2A assembled with the light source module and collimating
lens of FIG. 1. FIG. 2E is a schematic view illustrating the
alignment structure of FIG. 2A assembled with a heat wink and with
the light source module and collimating lens of FIG. 1.
[0021] With reference to FIG. 1 and FIG. 2A simultaneously, in this
embodiment, a light combining module 10 includes a plurality of
light source modules 120, 140, 160, and 180, a plurality of
dichroic mirrors 220 and 240, a plurality of collimating lenses
320, 340, 360, 380, and 390, and an alignment structure 520. The
light combining module 10 is, for example, applied to a projector,
a home theater, a rear projection screen, or a lighting fixture,
and the number of the light source modules 120, 140, 160, and 180
is embodied as four, but the invention is not limited thereto.
Specifically, in this embodiment, the light source module 120 is,
for example, a red LED that is used to output a red light 122; the
light source module 140 is, for example, a blue LED that is used to
output a blue light 142; the light source module 160 is, for
example, a blue LED that is covered with an excitable green
fluorescent layer and is used to output a green light 162; and the
light source module 180 is, for example, a blue LED that is used to
output a blue light 182. Herein, the light source modules 120, 140,
160, and 180 use LEDs as light sources, but in other embodiments, a
laser diode or a mercury lamp may also be used as a light source,
which still falls within the protective scope of the embodiments of
the invention.
[0022] As shown in FIG. 1, in this embodiment, the collimating
lenses 320, 340, 360, and 380 are disposed between the light source
modules 120, 140, 160, and 180 and the dichroic mirrors 220 and
240. Specifically, the collimating lens 320 is disposed between the
light source module 120 and the dichroic mirror 220, and is located
on a transmission path of the red light 122. The collimating lens
340 is disposed between the light source module 140 and the
dichroic mirror 240, and is located on a transmission path of the
blue light 142. The collimating lens 360 is disposed between the
light source module 160 and the dichroic mirror 240, and is located
on a transmission path of the green light 162. The collimating lens
380 is disposed between the light source module 180 and the
dichroic mirror 240, and is located on a transmission path of the
blue light 182. In addition, the collimating lens 390 is disposed
between the dichroic mirror 220 and the dichroic mirror 240, and is
located on the transmission paths of the blue light 142 and the
green light 162.
[0023] Furthermore, with reference to FIG. 1 again, in this
embodiment, the dichroic mirror 220 is disposed on the transmission
paths of the red light 122, the blue light 142, and the green light
162, and the dichroic mirror 240 is disposed on the transmission
paths of the blue light 182, the blue light 142, and the green
light 162. In detail, the dichroic mirror 240 may reflect the blue
light 182 to the light source module 160 so as to excite the light
source module 160 to output the green light 162, and the dichroic
mirror 240 may also reflect the blue light 142 to the dichroic
mirror 220. The output green light 162 may pass through the
dichroic mirror 240. The dichroic mirror 220 may be used to combine
the red light 122, the blue light 142, and the green light 162 that
is emitted by the dichroic mirror 240, so that the light combining
module 10 of this embodiment may emit a white light.
[0024] In particular, in the light source module 160 that adopts
the blue LED covered with the excitable green fluorescent layer as
the light source, the green fluorescent layer, in addition to being
excited by the blue LED underneath, may also reflect the blue light
182 output by the light source module 180 to the light source
module 160 via the dichroic mirror 240, thereby exciting the green
fluorescent layer and causing the light source module 160 to output
a stronger green light 162. As a result, the light combining module
10 provides enhanced brightness and improved image quality
applicable to a projector.
[0025] With reference to FIG. 2A, in this embodiment, the alignment
structure 520 includes a plurality of first elastic components 522,
a plurality of second elastic components 524, and a fastening
component 526. The first elastic components 522 are positioned in a
first direction X, the second elastic components 524 are positioned
in a second direction Y, and the first direction X is perpendicular
to the second direction Y. The fastening component 526 may lean
against the first elastic components 522 to elastically deform the
first elastic components 522 so that the alignment structure 520 is
moved in the first direction X. Alternatively, with reference to
FIG. 2B, the fastening component 526 may lean against the second
elastic components 524 to elastically deform the second elastic
components 524 so that the alignment structure 520 is moved in the
second direction Y. In one embodiment, the first elastic components
522 and the second elastic components 524 may be springs or plate
springs, for example, and the fastening component 526 may be a
screw or a bolt, for example, but the embodiments of the invention
are not limited thereto.
[0026] As shown in FIG. 2C, in this embodiment, the light source
module 160 may be assembled with the alignment structure 520. Or,
as shown in FIG. 2D, the collimating lens 360 is disposed on the
light source module 160, and the light source module 160 is
assembled with the alignment structure 520. Or, as shown in FIG.
2E, the light combining module 10 further includes a heat sink 620,
wherein the heat sink 620 is disposed on the alignment structure
520, and the light source module 160 is disposed on the heat sink
620. Thus, the heat sink 620 is disposed between the light source
module 160 and the alignment structure 520, the collimating lens
360 is disposed on the light source module 160, and the light
source module 160 is disposed on the alignment structure 520. When
a deviation occurs in the predetermined position where the dichroic
mirror 240 reflects the blue light 182 to the light source module
160 (i.e. the blue light 182 is not projected to the predetermined
position of the light source module 160), excitation efficiency
loss of the light source module 160 then follows as a result. At
this time, the position of the light source module 160 may be
adjusted by using the alignment structure 520, such as by causing
the fastening component 526 of the alignment structure 520 to lean
against the first elastic components 522 to elastically deform the
first elastic components 522, so that the light source module 160
is moved in the first direction X; or by causing the fastening
component 526 of the alignment structure 520 to lean against the
second elastic components 524 to elastically deform the second
elastic components 524, so that the light source module 160 is
moved in the second direction Y. Ultimately, the blue light 182 is
incident on the predetermined position of the light source module
160 to ensure that the excitation efficiency loss of the light
source module 160 is not too much.
[0027] Certainly, the structure/form of the alignment structure and
the adjustable components of the alignment structure are not
restricted by the embodiments of the invention. With reference to
FIGS. 3A to 3B and FIGS. 4A to 4D, two embodiments are provided in
the following to respectively illustrate different structural types
of the alignment structure and the adjustable components of the
alignment structure.
[0028] FIG. 3A is a schematic three-dimensional exploded view of an
alignment structure and the dichroic mirror and collimating lens of
FIG. 1 according to another embodiment of the invention. FIG. 3B is
a schematic top view of FIG. 3A. With reference to FIG. 3A and FIG.
3B simultaneously, in this embodiment, an alignment structure 540
includes an upper cover 640 and a base 660. A top surface 640a of
the upper cover 640 includes a position-limiting slot 642, and a
bottom surface 660a of the base 660 includes a sliding slot 662. A
collimating lens 360 is disposed inside the alignment structure
540, and the collimating lens 360 has a position-limiting member
362 and a locking member 364. The position-limiting member 362
protrudes above the position-limiting slot 642 of the upper cover
640, and the locking member 364 is slidably disposed inside the
sliding slot 662, so that there is a relative motion between the
collimating lens 360 and a light source module 160. As shown in
FIG. 3B, the relative motion includes moving, rotating, or moving
plus rotating.
[0029] As shown in FIG. 3B, when a deviation occurs in the
predetermined position where a dichroic mirror 240 reflects a blue
light 182 to the light source module 160 (i.e. the blue light 182
is not projected to the predetermined position of the light source
module 160 but is, for example, projected somewhere away from the
predetermined position of the light source module 160), the
position of the collimating lens 360 may then be adjusted by using
the alignment structure 540; for example, by applying a force to
the position-limiting member 362 of the collimating lens 360 that
protrudes above the position-limiting slot 642 of the upper cover
640, so that the collimating lens 360 may engage in moving,
rotating, or moving plus rotating in the position-limiting slot 642
of the upper cover 640 and in the sliding slot 662 of the base 660,
thereby causing a relative motion between the collimating lens 360
and the light source module 160. In this way, the blue light 182 is
projected to the predetermined position of the light source module
160 to ensure that the excitation efficiency loss of the light
source module 160 is not too much.
[0030] FIG. 4A is a schematic three-dimensional exploded view of an
alignment structure and the dichroic mirror and collimating lens of
FIG. 1 according to another embodiment of the invention. FIG. 4B is
a schematic top view of FIG. 4A. FIGS. 4C to 4D are schematic views
illustrating the alignment structure of FIG. 4A adjusting the
position of the dichroic mirror.
[0031] With reference to FIG. 4A to 4B simultaneously, an alignment
structure 560 of this embodiment is similar to the alignment
structure 540 of FIGS. 3A to 3B. The main difference between the
two alignment structures lies in that herein a top surface 640a of
an upper cover 640 includes a position-limiting slot 644, and a
bottom surface 660a of a base 660 includes a sliding slot 664. A
dichroic mirror 240 is disposed inside the alignment structure 560,
and the dichroic mirror 240 has a position-limiting member 242 and
a locking member 244. The position-limiting member 242 protrudes
above the position-limiting slot 644 of the upper cover 640, and
the locking member 244 is slidably disposed inside the sliding slot
664, so that there is a relative motion between the dichroic mirror
240 and a light source module 160. Here the relative motion
includes moving (please refer to FIG. 4C), rotating (please refer
to FIG. 4D), or moving plus rotating (please refer to FIG. 4B).
[0032] In brief, in this embodiment, since the light combining
module 10 is designed to include the alignment structure 520 (or
the alignment structure 540, or the alignment structure 560), the
light combining module 10, by using the alignment structure 520 (or
the alignment structure 540, or the alignment structure 560), may
adjust the position of the light source module 160, the position of
the dichroic mirror 240, or the position of the collimating lens
360 to ensure that the predetermined position where the blue light
182 is reflected to the light source module 160 is not deviated too
much, thereby achieving better excitation efficiency.
[0033] It should be noted that the light combining module 10 that
is taken as an example in the foregoing embodiments includes the
four light source modules 120, 140, 160, and 180, the two dichroic
mirrors 220 and 240, the five collimating lenses 320, 340, 360,
380, and 390, and the one alignment structure 520 (or the alignment
structure 540, or the alignment structure 560). However, in other
embodiments, if the excitation efficiency of the phosphor layer of
the light source module provided by the light combining module
needs to be enhanced, the light combining module at least should
have two light source modules, such as the light source modules 160
and 180, one dichroic mirror, such as the dichroic mirror 240, the
two collimating lenses 360 and 380, and the one alignment structure
520 (or the alignment structure 540, or the alignment structure
560). In this way, the light combining module may produce effects
of higher brightness and good image quality applicable to a
projector, just like the light combining module as described in the
embodiments of the invention.
[0034] [Tolerance Analysis]
[0035] In the following, a tolerance analysis is performed on a
first type LED and a second type LED to evaluate the degree of
excitation efficiency loss when a deviation occurs in the position
where the blue light 182 is projected to the light source module
160. Then, since position deviation may happen simultaneously to
the minor axis and the major axis of the collimating lens 360, the
position deviation amount of the minor axis and the position
deviation amount of the major axis are listed respectively to
evaluate how the amounts affect the effective excitation area and
the excitation efficiency loss, as shown in Table 1 and Table 2.
Herein Table 1 shows evaluation results of the first type LED, and
Table 2 shows evaluation results of the second type LED.
TABLE-US-00001 TABLE 1 light position effective excitation area
excitation efficiency loss deviation minor axis major axis minor
axis major axis amount (mm) deviation deviation deviation deviation
0 3.90 3.90 0% 0% 0.18 3.43 3.63 -12% -7% 0.118 3.59 3.72 -8% -5%
0.092 3.66 3.76 -6% -4% 0.077 3.70 3.78 -5% -3% 0.051 3.77 3.82 -3%
-2%
TABLE-US-00002 TABLE 2 light position effective excitation area
excitation efficiency loss deviation minor axis major axis minor
axis major axis amount (mm) deviation deviation deviation deviation
0 1.92 1.92 0% 0% 0.18 1.64 1.70 -15% -12% 0.118 1.74 1.78 -10% -8%
0.092 1.78 1.81 -7% -6% 0.077 1.80 1.83 -6% -5% 0.051 1.84 1.86 -4%
-3%
[0036] In light of the evaluation results of Table 1 and Table 2,
position deviations in the different directions (i.e. the minor
axis or the major axis) of the collimating lens 360 result in
different excitation efficiency losses. Since the effective
excitation area of the second type LED is smaller than the
effective excitation area of the first type LED, the excitation
efficiency loss of the second type LED is more obvious if the
position deviation amounts are the same. If the position of the
light source module 160, the position of the dichroic mirror 240,
or the position of the collimating lens 360 is adjusted by using
the alignment structure 520 (or the alignment structure 540, or the
alignment structure 560) to ensure that no deviation occurs in the
predetermined position where the blue light 182 is reflected to the
light source module 160 (i.e. the position deviation amount is 0
mm), then the cumulative tolerance may be significantly reduced, so
that the effective excitation area is increased and the problem of
excitation efficiency loss is solved.
[0037] In summary, in the embodiments of the invention, since the
light combining module is provided with the alignment structure,
the position of the light source module, the position of the
dichroic mirror, or the position of the collimating lens may then
be adjusted by the design of the alignment structure so as to
change the position where the dichroic mirror reflects the light to
the light source module, thereby achieving better excitation
efficiency. In brief, the light combining module in the embodiments
of the invention may produce higher brightness and good image
quality applicable to a projector.
[0038] Although the embodiments are already disclosed as above,
these embodiments should not be construed as limitations on the
scope of the invention. It will be apparent to those skilled in the
art that various modifications and variations can be made to the
disclosed embodiments without departing from the scope or spirit of
this invention. In view of the foregoing, it is intended that the
invention covers modifications and variations provided that they
fall within the scope of the following claims and their
equivalents.
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