U.S. patent application number 16/278725 was filed with the patent office on 2019-10-24 for projection apparatus.
This patent application is currently assigned to Coretronic Corporation. The applicant listed for this patent is Coretronic Corporation. Invention is credited to Jhih-Hao Chen, Yi-Cheng Hou, Shih-Yao Li.
Application Number | 20190324356 16/278725 |
Document ID | / |
Family ID | 65297679 |
Filed Date | 2019-10-24 |
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United States Patent
Application |
20190324356 |
Kind Code |
A1 |
Chen; Jhih-Hao ; et
al. |
October 24, 2019 |
PROJECTION APPARATUS
Abstract
A projection apparatus includes a casing, a light source module,
an optical engine module, a heat dissipation module and a
projection lens. The casing has multiple air inlets and an air
outlet. The light source module is disposed in the casing, and is
configured to provide an illumination beam, wherein the light
source module includes multiple light sources. The optical engine
module is disposed in the casing, and is located on a transmission
path of the illumination beam, and is configured to convert the
illumination beam into an image beam. The heat dissipation module
is disposed in the casing, and is connected to the light sources,
where the heat dissipation module includes multiple heat sinks
located close to the air inlets, respectively. The projection lens
is disposed in the casing, and is connected to the optical engine
module, and is configured to project the image beam out of the
casing.
Inventors: |
Chen; Jhih-Hao; (Hsin-Chu,
TW) ; Li; Shih-Yao; (Hsin-Chu, TW) ; Hou;
Yi-Cheng; (Hsin-Chu, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Coretronic Corporation |
Hsin-Chu |
|
TW |
|
|
Assignee: |
Coretronic Corporation
Hsin-Chu
TW
|
Family ID: |
65297679 |
Appl. No.: |
16/278725 |
Filed: |
February 19, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G03B 21/2033 20130101;
H04N 9/3144 20130101; G03B 21/2013 20130101; G03B 21/16
20130101 |
International
Class: |
G03B 21/16 20060101
G03B021/16; G03B 21/20 20060101 G03B021/20 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 20, 2018 |
CN |
201820566386.6 |
Claims
1. A projection apparatus, comprising: a casing, having a plurality
of air inlets and an air outlet; a light source module, disposed in
the casing, and configured to provide an illumination beam, wherein
the light source module comprises a plurality of light sources; an
optical engine module, disposed in the casing, and located on a
transmission path of the illumination beam, and configured to
convert the illumination beam into an image beam; a heat
dissipation module, disposed in the casing, and connected to the
plurality of light sources, wherein the heat dissipation module
comprises a plurality of heat sinks, and the plurality of heat
sinks are located close to the plurality of air inlets,
respectively; and a projection lens, disposed in the casing,
connected to the optical engine module, and configured to project
the image beam out of the casing.
2. The projection apparatus as claimed in claim 1, wherein air
inflow directions of the plurality of air inlets are all
perpendicular to an air outflow direction of the air outlet.
3. The projection apparatus as claimed in claim 1, wherein the
casing comprises a first sidewall and a second sidewall opposite to
each other, and a third sidewall and a fourth sidewall opposite to
each other and connected to the first sidewall and the second
sidewall, the plurality of air inlets at least comprise a first air
inlet, a second air inlet and a third air inlet, wherein the first
air inlet is disposed on the first sidewall, the second air inlet
and the third air inlet are separated from each other and disposed
on the second sidewall, and the air outlet is disposed on the
fourth sidewall.
4. The projection apparatus as claimed in claim 3, wherein the
plurality of light sources at least comprise a first light source,
a second light source and a third light source, and the heat
dissipation module further comprises a first heat pipe and a second
heat pipe, the plurality of heat sinks at least comprise a first
heat sink, a second heat sink and a third heat sink, the first heat
sink is connected to the third light source through the first heat
pipe, the second heat sink is connected to the first light source
through the second heat pipe, and the third heat sink is directly
connected to the second light source.
5. The projection apparatus as claimed in claim 4, wherein the
first hat sink is located close to the first air inlet, the second
heat sink is located close to the second air inlet, and the third
heat sink is located close to the third air inlet.
6. The projection apparatus as claimed in claim 5, wherein in the
optical engine module, a transmission path of a sub-illumination
beam of the third light source is shorter than a transmission path
of a sub-illumination beam of the first light source.
7. The projection apparatus as claimed in claim 5, wherein the
plurality of light sources further comprise an auxiliary excitation
light source, the plurality of heat sinks further comprise a fourth
heat sink, the fourth heat sink is directly connected to the
auxiliary excitation light source, and the second heat sink is
located between the second air inlet and the fourth heat sink.
8. The projection apparatus as claimed in claim 4, wherein the
second heat sink is located close to the first air inlet, the first
heat sink is located close to the second air inlet, and the third
heat sink is located close to the third air inlet.
9. The projection apparatus as claimed in claim 8, wherein in the
optical engine module, a transmission path of a sub-illumination
beam of the first light source is shorter than a transmission path
of a sub-illumination beam of the third light source.
10. The projection apparatus as claimed in claim 3, wherein the
plurality of air inlets further comprise a fourth air inlet
corresponding to the projection lens, wherein the fourth air inlet
and the first air inlet are separated from each other and disposed
on the first sidewall.
11. The projection apparatus as claimed in claim 10, further
comprising: a fan, disposed in the casing, and located close to the
fourth air inlet, wherein the fan is located between the projection
lens and the fourth air inlet.
12. The projection apparatus as claimed in claim 3, wherein the
casing further has a lens opening corresponding to the projection
lens and disposed on the third sidewall.
13. The projection apparatus as claimed in claim 1, further
comprising: a plurality of fans, disposed in the casing, and
located between the heat dissipation module and the air outlet.
14. The projection apparatus as claimed in claim 4, wherein the
first light source, the second light source and the third light
source are a red light-emitting diode, a blue light-emitting diode
and a green light source.
15. The projection apparatus as claimed in claim 4, wherein the
first light source, the second light source and the third light
source are a red light-emitting diode, a blue light-emitting diode
and a green light-emitting diode.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims the priority benefit of China
application serial no. 201820566386.6, filed on Apr. 20, 2018. The
entirety of the above-mentioned patent application is hereby
incorporated by reference herein and made a part of this
specification.
BACKGROUND OF THE INVENTION
Field of the Invention
[0002] The invention relates to an electronic apparatus, and
particularly relates to a projection apparatus.
Description of Related Art
[0003] In an existing projection apparatus, air inlets are
respectively configured at a front end of a left side and a back
end of a right side of a casing, and air outlets are respectively
configured at a right end of a front side and a left end of a back
side of the casing. A heat sink of a red light-emitting diode (LED)
is disposed corresponding to the air inlet of the back end of the
right side, and a heat sink of a green LED is disposed
corresponding to the air outlet of the right end of the front side.
When a cooling airflow enters the casing, the cooling airflow first
flows through the heat sink of the red LED, and then flows through
the heat sink of the green LED. Since the red LED and the green LED
are more affected by efficiency of a temperature change, a
brightness of the red LED is decreased by 7.9% when a temperature
thereof is increased by 10.degree. C.; and a brightness of the
green LED is decreased by 3% when a temperature thereof is
increased by 10.degree. C. Therefore, although the green LED is not
so obvious in brightness attenuation in case of temperature
increase, an overall light-emitting efficiency thereof is
ineffective under a same heat dissipation performance.
[0004] Moreover, since a heat sink of a blue LED is located between
an optical engine module and an electromagnetic shielding casing
covering a power supply, and is not located close to the air inlets
and the air outlets and is located at a dead zone of a flow field
where the cooling airflow does not pass there through at all, heat
produced by the blue LED cannot be exhausted, which results in over
temperature of the whole projection apparatus. Moreover, in order
to improve a brightness of the projection apparatus, it is known
that the projection apparatus increases airflow of a fan by
increasing rotating speed of a fan, so as to decrease the
temperature of the LEDs. However, the above method may cause
increase of a noise value of the whole projection apparatus, which
may lead to a poor usage experience of consumers.
[0005] The information disclosed in this Background section is only
for enhancement of understanding of the background of the described
technology and therefore it may contain information that does not
form the prior art that is already known to a person of ordinary
skill in the art. Further, the information disclosed in the
Background section does not mean that one or more problems to be
resolved by one or more embodiments of the invention were
acknowledged by a person of ordinary skill in the art.
SUMMARY OF THE INVENTION
[0006] The invention is directed to a projection apparatus, which
has a good heat dissipation effect.
[0007] Other objects and advantages of the invention can be further
illustrated by the technical features broadly embodied and
described as follows.
[0008] In order to achieve one or a portion of or all of the
objects or other objects, an embodiment of the invention provides a
projection apparatus including a casing, a light source module, an
optical engine module, a heat dissipation module and a projection
lens. The casing has a plurality of air inlets and an air outlet.
The light source module is disposed in the casing, and is
configured to provide an illumination beam, wherein the light
source module includes a plurality of light sources. The optical
engine module is disposed in the casing, and is located on a
transmission path of the illumination beam, and is configured to
convert the illumination beam into an image beam. The heat
dissipation module is disposed in the casing, and is connected to
the light sources, wherein the heat dissipation module includes a
plurality of heat sinks, and the heat sinks are located close to
the air inlets, respectively. The projection lens is disposed in
the casing, and is connected to the optical engine module, and is
configured to project the image beam out of the casing.
[0009] Based on the above description, the embodiment of the
invention has at least one of following advantages or effects. In
the design of projection apparatus of the invention, the heat
dissipation module is connected to the light sources, and the heat
sinks of the heat dissipation module are located close to the air
inlets, respectively. Therefore, when a cooling airflow enters the
casing through the air inlets, the cooling airflow is adapted to
directly cool down the heat sinks, so as to achieve an effect of
decreasing a temperature in internal of the projection apparatus.
In brief, the projection apparatus of the invention have good heat
dissipation effect.
[0010] Other objectives, features and advantages of the invention
will be further understood from the further technological features
disclosed by the embodiments of the invention wherein there are
shown and described preferred embodiments of this invention, simply
by way of illustration of modes best suited to carry out the
invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] 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
embodiments of the invention and, together with the description,
serve to explain the principles of the invention.
[0012] FIG. 1 is a schematic diagram of a projection apparatus
according to an embodiment of the invention.
[0013] FIG. 2 is a schematic diagram of another projection
apparatus according to an embodiment of the invention.
[0014] FIG. 3 is a schematic diagram of another projection
apparatus according to an embodiment of the invention.
[0015] FIG. 4 is a schematic diagram of another projection
apparatus according to an embodiment of the invention.
[0016] FIG. 5 is a partial schematic diagram of a third light
source and an auxiliary excitation light source.
DESCRIPTION OF EMBODIMENTS
[0017] In the following detailed description of the preferred
embodiments, reference is made to the accompanying drawings which
form a part hereof, and in which are shown by way of illustration
specific embodiments in which the invention may be practiced. In
this regard, directional terminology, such as "top," "bottom,"
"left," "right," "front," "back," etc., is used with reference to
the orientation of the Figure(s) being described. A size of
openings of air inlets and air outlets mentioned in the invention
is only schematic in the figures, and is not used for representing
a range of the openings. As such, the directional terminology is
used for purposes of illustration and is in no way limiting. It is
to be understood that other embodiments may be utilized and
structural changes may be made without departing from the scope of
the invention. Also, it is to be understood that the phraseology
and terminology used herein are for the purpose of description and
should not be regarded as limiting. The use of "including",
"comprising", or "having" and variations thereof herein is meant to
encompass the items listed thereafter and equivalents thereof as
well as additional items. Unless limited otherwise, the terms
"connected", "coupled", and "mounted" and variations thereof herein
are used broadly and encompass direct and indirect connections,
couplings, and mountings. Similarly, the terms "facing," "faces"
and variations thereof herein are used broadly and encompass direct
and indirect facing, and "adjacent to" and variations thereof
herein are used broadly and encompass directly and indirectly
"adjacent to". Therefore, the description of "A" component facing
"B" component herein may contain the situations that "A" component
directly faces "B" component or one or more additional components
are between "A" component and "B" component. Also, the description
of "A" component "adjacent to" "B" component herein may contain the
situations that "A" component is directly "adjacent to" "B"
component or one or more additional components are between "A"
component and "B" component. Accordingly, the drawings and
descriptions will be regarded as illustrative in nature and not as
restrictive.
[0018] FIG. 1 is a schematic diagram of a projection apparatus
according to an embodiment of the invention. Referring to FIG. 1,
in the embodiment, the projection apparatus 100a includes a casing
110, a light source module 120, an optical engine module 130, a
heat dissipation module 140 and a projection lens 150. The casing
110 has a plurality of air inlets E and an air outlet T, wherein
air inflow directions D of the air inlets E are all perpendicular
to an air outflow direction Z of the air outlet T. The light source
module 120 is disposed in the casing 110, and is configured to
provide an illumination beam L1, wherein the light source module
120 includes a plurality of light sources S. The optical engine
module 130 is disposed in the casing 110, and is located on a
transmission path of the illumination beam L1, and is configured to
convert the illumination beam L1 into an image beam L2. The heat
dissipation module 140 is disposed in the casing 110, and is
connected to the light sources S, wherein the heat dissipation
module 140 includes a plurality of heat sinks H, and the heat sinks
H are located close to the air inlets E, respectively. For example,
when the cooling airflow enters the casing 110 through the air
inlets E, the cooling airflow first contacts the heat sinks H,
though the invention is not limited thereto, and in other
embodiments, other heat dissipation devices (for example, fans) may
be disposed between the air inlets E and the heat sinks H according
to different heat dissipation designs. The projection lens 150 is
disposed in the casing 110, and is connected to the optical engine
module 130, and is configured to project the image beam L2 out of
the casing 110.
[0019] In detail, the casing 110 of the embodiment includes a first
sidewall 111 and a second sidewall 113 opposite to each other, and
a third sidewall 115 and a fourth sidewall 117 opposite to each
other and connected to the first sidewall 111 and the second
sidewall 113. The air inlets E at least include a first air inlet
112, a second air inlet 114 and a third air inlet 116, wherein the
first air inlet 112 is disposed on the first sidewall 111, the
second air inlet 114 and the third air inlet 116 are separated from
each other and disposed on the second sidewall 113, and the air
outlet T is disposed on the fourth sidewall 117, and the third
sidewall 115 is not configured with an air inlet or air outlet. An
air inflow direction D1 of the first air inlet 112 and an air
inflow direction D2 of the second air inlet 114 and the third air
inlet 116 are all perpendicular to the air outflow direction Z of
the air outlet T. The air inflow direction D1 of the first air
inlet 112 is opposite to the air inflow direction D2 of the second
air inlet 114 and the third air inlet 116.
[0020] Moreover, the light sources S of the light source module 120
of the embodiment are, for example, solid-state illumination
sources, for example, light-emitting diodes (LEDs) or laser diodes.
The light sources S at least include a first light source 122, a
second light source 124 and a third light source 126. For example,
the first light source 122 is a red LED, the second light source
124 is a blue LED and the third light source 126 is a light source
emitting a green light beam, which are described in detail later.
In other embodiments, the first light source 122, the second light
source 124 and the third light source 126 may be placed differently
according to the heat dissipation design. The heat dissipation
module 140 further includes a first heat pipe 141 and a second heat
pipe 143. The heat sinks H at least include a first heat sink 142,
a second heat sink 144 and a third heat sink 146. The first heat
sink 142 is connected to the third light source 126 through the
first heat pipe 141. The second heat sink 144 is connected to the
first light source 122 through the second heat pipe 143. The third
heat sink 146 is directly connected to the second light source 124.
Particularly, the first heat sink 142 of the embodiment is located
close to the first air inlet 112, the second heat sink 144 is
located close to the second air inlet 114, and the third heat sink
146 is located close to the third air inlet 116. Since the heat
dissipation module 140 is connected to the light sources S, and the
heat sinks H of the heat dissipation module 140 are located close
to the air inlets E respectively, when a cooling airflow enters the
casing 110 through the air inlets E, the cooling airflow may
directly cool down the heat sinks H, so as to achieve an effect of
decreasing an internal temperature of the projection apparatus
100a. In brief, the projection apparatus 100a of the embodiment may
have a good heat dissipation effect.
[0021] In order to improve an optical effect of the projection
apparatus 100a, the light sources S of the embodiment further
include an auxiliary excitation light source 128, wherein the
auxiliary excitation light source 128 is, for example, a blue LED
or a blue laser diode, which is used for providing a light beam of
a blue light spectrum. The heat sinks H further include a fourth
heat sink 148. The fourth heat sink 148 is directly connected to
the auxiliary excitation light source 128, and in the air inflow
direction D2 of the second air inlet 114, the second heat sink 144
is located between the second air inlet 114 and the fourth heat
sink 148. Since the auxiliary excitation light source 128 may
withstand a higher operating temperature, it may be still in a
proper heat conduction state although it is located behind the
second heat sink 144 (i.e. located at a downstream of the cooling
airflow). At least 3% of green light brightness is enhanced by
configuring the auxiliary excitation light source 128, such that
the brightness of the whole projection apparatus 100a is increased,
which is described in detail later.
[0022] It should be noted that in the embodiment, the numbers of
the light sources S and the heat sinks H are, for example,
respectively four, though the embodiment is not limited thereto. In
other embodiment that is not shown, the numbers of the light
sources and the heat sinks may be increased or decreased according
to an actual deign requirement.
[0023] Moreover, the light source module 120 of the embodiment
includes a plurality of light combining elements (not shown), for
example, a dichroic mirror, a lens, etc., which are used for
combining sub-illumination beams emitted by the first light source
122, the second light source 124, the third light source 126 and
the auxiliary excitation light source 128 to form the illumination
beam L1. The illumination beam L1 provided by the light source
module 120 is converted by a light valve (not shown) in the optical
engine module 130 to form an image beam L2. The light valve is a
light modulating element, and the light modulating element is, for
example, a reflective or transmissive spatial light modulator,
wherein the reflective spatial light modulator is, for example, a
reflective Liquid Crystal on Silicon (LCOS) or a Digital
Micro-mirror Device (DMD), etc.; and the transmissive spatial light
modulator is, for example, a transparent liquid crystal panel. The
projection lens 150 is located on a transmission path of the image
beam L2, and is configured to project the image beam L2 out of the
casing 110. Herein, in the optical engine module 130, a
transmission path of the sub-illumination beam L11 of the third
light source 126 is shorter than a transmission path of the
sub-illumination beam L12 of the first light source 122. Namely,
the third light source 126 is located closer to the optical engine
module 130 compared to the first light source 122. As shown in FIG.
1, a length of the first heat pipe 141 of the heat dissipation
module 140 is longer than a length of the second heat pipe 143 of
the heat dissipation module 140, so that heating the optical engine
module 130 and the projection lens 150 is avoided by controlling
the length of the heat pipe connected to the third light source
126. In this way, a situation of image defocus due to a temperature
change of the projection lens 150 is mitigated.
[0024] Moreover, the casing 110 of the embodiment further has a
lens opening N corresponding to the projection lens 150 and
disposed on the third sidewall 115. Namely, the lens opening N and
the air outlet T are opposite to each other. Moreover, the
projection apparatus 100a of the embodiment further includes a
plurality of fans 160, for example, axial fans, which are disposed
in the casing 110 and located between the heat dissipation module
140 and the air outlet T, and are configured to exhaust the heat in
the casing 110.
[0025] In brief, in the design of the projection apparatus 100a of
the embodiment, the heat dissipation module 140 is connected to the
light sources S, and the heat sinks H of the heat dissipation
module 140 are respectively located close to the air inlets E.
Therefore, when the cooling airflow enters the casing 110 through
the air inlets E, the cooling airflow may directly cool down the
heat sinks H, i.e. cools down the first light source 122, the
second light source 124 and the third light source 126 first. Since
the first light source 122 is, for example, a red LED and the third
light source 126 is, for example, a green light source used for
producing a light beam of a green light spectrum, it is easy to be
affected by temperature to cause decrease of lighting efficiency
(brightness), so as to achieve the effect of decreasing the
temperature inside the projection apparatus 100a. Compared to the
conventional technique of increasing the airflow of the fan by
increasing the rotating speed of the fan to decrease the
temperature of the light source, the projection apparatus 100a of
the embodiment may have better heat dissipation effect without
increasing noise, and the light sources S may be controlled to an
operating temperature corresponding to higher optical efficiency
(brightness).
[0026] It should be noted that reference numbers of the components
and a part of contents of the aforementioned embodiment are also
used in the following embodiment, wherein the same reference
numbers denote the same or like components, and descriptions of the
same technical contents are omitted. The aforementioned embodiment
may be referred for descriptions of the omitted parts, and detailed
descriptions thereof are not repeated in the following
embodiment.
[0027] FIG. 2 is a schematic diagram of another projection
apparatus according to an embodiment of the invention. Referring to
FIG. 1 and FIG. 2, the projection apparatus 100b of the embodiment
is similar to the projection apparatus 100a of FIG. 1, and a
difference there between is that positions of the first light
source 122 and the second heat sink 144 of the embodiment are
exchanged with positions of the third light source 126 and the
first heat sink 142. In detail, the second heat sink 144 is located
close to the first air inlet 112, the first heat sink 142 is
located close to the second air inlet 114, and the third heat sink
146 is located close to the third air inlet 116. In the optical
engine module 130, a transmission path of the sub-illumination beam
L12 of the first light source 122 is shorter than a transmission
path of the sub-illumination beam L11 of the third light source
126. Namely, the first light source 122 is located closer to the
optical engine module 130 compared to the third light source 126.
Since heat energy escaped from the first light source 122 is
relatively less, the airflow blowing the optical engine module 130
may decrease the temperature of the optical engine module 130 by at
least 3.degree. C. under the above configuration. Furthermore,
another difference between the projection apparatus 100b of the
embodiment and the projection apparatus 100a of FIG. 1 is that the
third light source 126 of the embodiment is, for example, a green
LED, and it is unnecessary to use the auxiliary excitation light
source 128 and the fourth heat sink 148, so as to decrease heat
accumulation inside the casing 110.
[0028] FIG. 3 is a schematic diagram of another projection
apparatus according to an embodiment of the invention. Referring to
FIG. 1 and FIG. 3, the projection apparatus 100c of the embodiment
is similar to the projection apparatus 100a of FIG. 1, and a
difference there between is that the air inlet E' of the casing
110' of the embodiment further includes a fourth air inlet 118
corresponding to the projection lens 150. The fourth air inlet 118
and the first air inlet 112 are separated from each other and
disposed on the first sidewall 111. Moreover, the projection
apparatus 100c of the embodiment further includes a fan 170
disposed inside the casing 110' and located close to the fourth air
inlet 118, wherein the fan 170 is located between the projection
lens 150 and the fourth air inlet 118, and is configured to cool
down the projection lens 150 to avoid the situation of defocus due
to over temperature of the projection lens 150.
[0029] FIG. 4 is a schematic diagram of another projection
apparatus according to an embodiment of the invention. Referring to
FIG. 1 and FIG. 4, the projection apparatus 100d of the embodiment
is similar to the projection apparatus 100a of FIG. 1, and a
difference there between is that the third light source 126 of the
embodiment is, for example, a green LED, and it is unnecessary to
use the auxiliary excitation light source 128 and the fourth heat
sink 148, so as to decrease heat accumulation inside the casing
110.
[0030] FIG. 5 is a partial schematic diagram of a third light
source and an auxiliary excitation light source. Referring to FIG.
1, FIG. 3 and FIG. 5, the third light source 126 and the auxiliary
excitation light source 128 of the embodiment are respectively
connected to the first heat pipe 141 and the fourth heat sink 148,
and the light source module 120 further includes a dichroic mirror
121, wherein the dichroic mirror 121 is located between the third
light source 126 and the auxiliary excitation light source 128. In
the embodiment, the third light source 126 is, for example, a green
light source, and the third light source 126 includes a wavelength
conversion element PW and a light-emitting chip CP, wherein the
light-emitting chip CP of the third light source 126 is used for
producing an excitation beam L4, and the excitation beam L4 is a
light beam of a blue light spectrum; the wavelength conversion
element PW is used for converting the excitation beam L4 (blue
light) emitted by the light-emitting chip CP into the
sub-illumination beam L11 (green light) for transmitting to the
dichroic mirror 121, and the dichroic mirror 121 reflects the
sub-illumination beam L11 (green light) to a direction toward the
optical engine module 130. Moreover, the dichroic mirror 121 is
pervious to the sub-illumination beam L12 (red light) emitted by
the first light source 122 and the light beam (blue light) emitted
by the second light source 124. Since the third light source 126
and the auxiliary excitation light source 128 are disposed opposite
to each other, the excitation beam L3 (blue light) emitted by the
auxiliary excitation light source 128 may successfully pass through
the dichroic mirror 121 to reach the wavelength conversion element
PW of the third light source 126, and the wavelength conversion
element PW converts the excitation beam L3 (blue light) into the
sub-illumination beam L11 (green light) for transmitting to the
dichroic mirror 121. Through the aforementioned configuration of
the third light source 126 and the auxiliary excitation light
source 128, the green light brightness may be increased by at least
3%, such that the overall brightness of the projection apparatus
100a is enhanced.
[0031] In summary, the embodiments of the invention have at least
one of the following advantages or effects. In the design of
projection apparatus of the invention, the heat dissipation module
is connected to the light sources, and the heat sinks of the heat
dissipation module are located close to the air inlets,
respectively. Therefore, when a cooling airflow enters the casing
through the air inlets, the cooling airflow is adapted to directly
cool down the heat sinks, so as to achieve an effect of decreasing
a temperature in internal of the projection apparatus. Compared to
the conventional technique of increasing the airflow of the fan by
increasing the rotating speed of the fan to decrease the
temperature of the light source, the projection apparatus of the
invention may have better heat dissipation effect without
increasing noise, and the light sources may be controlled to an
operating temperature corresponding to higher optical
efficiency.
[0032] The foregoing description of the preferred embodiments of
the invention has been presented for purposes of illustration and
description. It is not intended to be exhaustive or to limit the
invention to the precise form or to exemplary embodiments
disclosed. Accordingly, the foregoing description should be
regarded as illustrative rather than restrictive. Obviously, many
modifications and variations will be apparent to practitioners
skilled in this art. The embodiments are chosen and described in
order to best explain the principles of the invention and its best
mode practical application, thereby to enable persons skilled in
the art to understand the invention for various embodiments and
with various modifications as are suited to the particular use or
implementation contemplated. It is intended that the scope of the
invention be defined by the claims appended hereto and their
equivalents in which all terms are meant in their broadest
reasonable sense unless otherwise indicated. Therefore, the term
"the invention", "the present invention" or the like does not
necessarily limit the claim scope to a specific embodiment, and the
reference to particularly preferred exemplary embodiments of the
invention does not imply a limitation on the invention, and no such
limitation is to be inferred. The invention is limited only by the
spirit and scope of the appended claims. Moreover, these claims may
refer to use "first", "second", etc. following with noun or
element. Such terms should be understood as a nomenclature and
should not be construed as giving the limitation on the number of
the elements modified by such nomenclature unless specific number
has been given. The abstract of the disclosure is provided to
comply with the rules requiring an abstract, which will allow a
searcher to quickly ascertain the subject matter of the technical
disclosure of any patent issued from this disclosure. It is
submitted with the understanding that it will not be used to
interpret or limit the scope or meaning of the claims. Any
advantages and benefits described may not apply to all embodiments
of the invention. It should be appreciated that variations may be
made in the embodiments described by persons skilled in the art
without departing from the scope of the invention as defined by the
following claims. Moreover, no element and component in the
disclosure is intended to be dedicated to the public regardless of
whether the element or component is explicitly recited in the
following claims.
[0033] Finally, it will be apparent to those skilled in the art
that various modifications and variations can be made to the
structure of the disclosure without departing from the scope or
spirit of the disclosure. In view of the foregoing, it is intended
that the disclosure cover modifications and variations of this
disclosure provided they fall within the scope of the following
claims and their equivalents.
* * * * *