Projection device

Abstract

The invention provides a projection device which comprises a machine shell, a projection lens, a first light source module, a first heat dissipation module and a first fan. An upper cover and a lower cover of the casing are respectively connected with a front cover, a rear cover, a first side cover and a second side cover to form an accommodating space. The lower cover has a first air inlet. The first side cover is provided with a second air inlet. The second side cover is provided with an air outlet. The projection lens has a setting direction to divide the accommodating space into a first area and a second area. The first air inlet and the second air inlet are located in the first area. The air outlet is located in the second area. The first heat dissipation module comprises a base part, at least one first heat pipe and a plurality of heat dissipation fins. The at least one first heat pipe is perpendicular to the base portion, and the plurality of heat dissipation fins are parallel to the base portion. The air outlet face of the first fan faces the upper cover, and the air inlet face faces the lower cover. The included angle between the normal extending direction of the air inlet face and the first air inlet ranges from 30 degrees to 150 degrees. The projection device provided by the invention can have a better heat dissipation effect.

Description

Technical Field

[0001] This invention relates to an optical device, and more particularly to a projection device. Background Technology

[0002] Generally, ultra-short-throw projectors have a light divergence angle (or cone angle) on the top cover, located along the path of the image beam from the projection lens. Because of this divergence angle, the fan cannot be placed downstream of the heatsink fins (i.e., the heatsink fins are located between the air inlet and the fan). The fan must be moved outside this divergence angle to meet cooling requirements. However, this configuration limits the size and position of the fan, and moving the fan outward generates more noise, thus affecting the projector's cooling performance and noise levels. Furthermore, the divergence angle limits the length of the heatsink fins, potentially leading to insufficient heatsink volume and further impacting the projector's cooling efficiency. Additionally, as the brightness and heat of the projector increase, the only solutions are to increase the size of the heatsink fins or the fan speed, resulting in an increase in the projector's size or noise level.

[0003] The "Background Art" paragraph is only used to help understand the content of this invention. Therefore, the content disclosed in the "Background Art" paragraph may include some prior art that is not known to those skilled in the art. The content disclosed in the "Background Art" paragraph does not mean that the content or the problem to be solved by one or more embodiments of this invention was known or recognized by those skilled in the art before this application was filed. Summary of the Invention

[0004] The present invention provides a projection device that has a better heat dissipation effect.

[0005] Other objects and advantages of the present invention can be further understood from the technical features disclosed herein.

[0006] To achieve one or more of the above-mentioned objectives or other objectives, an embodiment of the present invention provides a projection device, including a housing, a projection lens, a first light source module, a first heat dissipation module, and a first fan. The housing includes a front cover and a rear cover opposite to each other, a first side cover and a second side cover opposite to each other, and an upper cover and a lower cover opposite to each other. The first side cover and the second side cover are respectively connected to the front cover and the rear cover. The upper cover and the lower cover connect the front cover, the rear cover, the first side cover, and the second side cover to form an accommodating space. The lower cover has a first air inlet, and the first side cover has a second air inlet and an air outlet. The projection lens is disposed within the housing. The projection lens has an orientation to divide the accommodating space into a first region and a second region. The first air inlet and the second air inlet are located in the first region, and the air outlet is located in the second region. The first light source module, the first heat dissipation module, and the first fan are located within the first region. The first light source module is connected to the first heat dissipation module, and the first heat dissipation module is located between the first air inlet and the first fan. The first heat dissipation module includes a base, at least one first heat pipe, and multiple heat dissipation fins. The base is connected to the first light source module. At least one first heat pipe is perpendicular to the base, and multiple heat dissipation fins are parallel to the base. The first fan has an exhaust surface and an intake surface. The exhaust surface faces the upper cover, while the intake surface faces the lower cover, and the angle between the normal extension direction of the intake surface and the first air inlet is between 30 degrees and 150 degrees.

[0007] Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. In the design of the projection device of the present invention, the lower cover of the casing has a first air inlet, wherein the first light source module is connected to the first heat dissipation module, and the first heat dissipation module is located between the first air inlet and the first fan. That is, the first fan is located downstream of the airflow of the first heat dissipation module and between the first heat dissipation module and the upper cover, rather than at the side cover, which can improve the heat dissipation efficiency of the first heat dissipation module for the first light source module, and the sound generated by the first fan is less likely to be transmitted from the side cover, which can effectively reduce noise. Furthermore, the first heat pipe of the first heat dissipation module is perpendicular to the base, and the heat dissipation fins are parallel to the base. Therefore, compared with the bent heat pipes connected to the base in the prior art, the first heat dissipation module of the embodiments of the present invention does not need to consider the space occupied by the bent heat pipes, which can effectively increase the heat dissipation area of ​​the heat dissipation fins and increase the space utilization rate within the accommodating space. Furthermore, the exhaust surface and intake surface of the first fan face the upper cover and lower cover respectively, and the angle between the normal extension direction of the fan's intake surface and the first air inlet is between 30 degrees and 150 degrees. In other words, the first fan is not vertically positioned parallel to the side cover within the accommodating space, but rather lies horizontally / obliquely within the accommodating space. In short, the projection device of this invention has better heat dissipation, effectively reduces noise, and improves the space utilization of the projection device. Attached Figure Description

[0008] Figure 1A This is a top view schematic diagram of a projection device according to an embodiment of the present invention.

[0009] Figure 1B yes Figure 1A A front view diagram.

[0010] Figure 1C yes Figure 1A A side view diagram.

[0011] Figure 1D yes Figure 1A A schematic diagram of the first heat dissipation module in the projection device.

[0012] Figure 2 This is a front view schematic diagram of a projection device according to another embodiment of the present invention.

[0013] Figure 3 This is a schematic diagram of a first heat dissipation module according to another embodiment of the present invention.

[0014] List of reference numerals

[0015] 100a, 100b: Projection device

[0016] 110: Chassis

[0017] 111: Front Cover

[0018] 112: Back cover

[0019] 113: First side cover

[0020] 114: Second side cover

[0021] 115: Top Cover

[0022] 116: Bottom Cover

[0023] 117: Light department

[0024] 120: Projection lens

[0025] 125: Light valve

[0026] 127: Heat dissipation module

[0027] 129: Heat pipe

[0028] 130: First Light Source Module

[0029] 135: Optical Path Guidance Module

[0030] 137, 138, 139: System fans

[0031] 140a, 140b: First heat dissipation module

[0032] 141, 141': First surface

[0033] 142, 142': Base

[0034] 143, 143': Second surface

[0035] 144: First heat pipe

[0036] 146: Heat dissipation fins

[0037] 148: Auxiliary fins

[0038] 150a, 150b: First fan

[0039] 151, 151': Air outlet

[0040] 153, 153': Inlet side

[0041] 155: Driver circuit board

[0042] 161, 163, 165, 167, 169: Air guide plates

[0043] 170: Second Light Source Module

[0044] 175, 177: Speakers

[0045] 180: Second heat dissipation module

[0046] 182: Second heat pipe

[0047] 184: Heat dissipation fin assembly

[0048] 190: Second Fan

[0049] A, A': Angle

[0050] B: Extension direction

[0051] D, D': Direction of normal extension

[0052] E1: First air inlet

[0053] E2, E21, E22: Second air inlet

[0054] E3: Air outlet

[0055] L: Set direction

[0056] S: Storage space

[0057] S1: First Area

[0058] S2: Second Area

[0059] X: Optical axis. Detailed Implementation

[0060] The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front, or back, are merely for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the present invention.

[0061] Figure 1A This is a top view schematic diagram of a projection device according to an embodiment of the present invention. Figure 1B yes Figure 1A A front view diagram. Figure 1C yes Figure 1A A side view diagram. Figure 1D yes Figure 1A A schematic diagram of the first heat dissipation module in the projection device. It should be noted that, for clarity, Figure 1B Some components, such as speaker 175, are omitted from the drawing.

[0062] Please also refer to Figure 1A , Figure 1B , Figure 1C as well as Figure 1DIn this embodiment, the projection device 100a includes a housing 110, a projection lens 120, a first light source module 130, a first heat dissipation module 140a, and a first fan 150a. The housing 110 includes a front cover 111 and a rear cover 112 opposite to each other, a first side cover 113 and a second side cover 114 opposite to each other, and an upper cover 115 and a lower cover 116 opposite to each other. The first side cover 113 and the second side cover 114 are respectively connected to the front cover 111 and the rear cover 112. The upper cover 115 and the lower cover 116 connect the front cover 111, the rear cover 112, the first side cover 113, and the second side cover 114 to form an accommodating space S. The lower cover 116 has a first air inlet E1, while the first side cover 113 has a second air inlet E2, and the second side cover 114 has an air outlet E3. The projection lens 120 is disposed within the housing 110. The projection lens 120 has a setting direction L to divide the accommodating space S into a first region S1 and a second region S2. A first air inlet E1 and a second air inlet E2 are located in the first region S1, while an air outlet E3 is located in the second region S2. A first light source module 130, a first heat dissipation module 140a, and a first fan 150a are located within the first region S1. The first light source module 130 is connected to the first heat dissipation module 140a, which is located between the first air inlet E1 and the first fan 150a. The first heat dissipation module 140a includes a base 142, at least one first heat pipe (four first heat pipes 144 are schematically shown), and a plurality of heat dissipation fins 146. The base 142 is connected to the first light source module 130. The first heat pipes 144 are perpendicular to the base 142, and the plurality of heat dissipation fins 146 are parallel to the base 142. The first fan 150a has an air outlet surface 151 and an air inlet surface 153. The air outlet 151 faces the upper cover 115, while the air inlet 153 faces the lower cover 116, and the angle A between the normal extension direction D of the air inlet 153 and the first air inlet E1 is between 30 degrees and 150 degrees.

[0063] In detail, in this embodiment, the housing 110 may be made of materials such as aluminum, plastic, or resin (e.g., white polycarbonate, white polysiloxane), but is not limited to these. The upper cover 115 of the housing 110 has a light-emitting portion 117, which is located on the transmission path of the image beam from the projection lens 120. Here, the light-emitting portion 117 is, for example, a light divergence angle (or Cone angle), which is set to avoid blocking the image beam from the projection lens 120. Please also refer to... Figure 1B as well as Figure 1CIn this embodiment, the airflow direction of the first air inlet E1 is different from that of the second air inlet E2, wherein the airflow direction of the first air inlet E1 can be perpendicular to the airflow direction of the second air inlet E2. Preferably, the ratio of the area of ​​the second air inlet E2 to the area of ​​the first air inlet E1 can be, for example, between 0.5 and 1. That is, the area of ​​the second air inlet E2 can be less than or equal to the area of ​​the first air inlet E1. The smaller area of ​​the second air inlet E2 can reduce the noise generated when the fan is running, which is then transmitted outside the casing 110 through the second air inlet E2, thereby reducing noise and improving the user experience of the projection device 100a. In this embodiment, the projection device 100a improves the heat dissipation effect by using the first air inlet E1 that enters from the lower cover 116 and the second air inlet E2 that enters from the first side cover 113.

[0064] In this embodiment, the number of second air inlets E2 can be one or more. For example, the number of second air inlets E2 is specifically two, namely second air inlet E21 and second air inlet E22. Second air inlet E21 corresponds to the first heat dissipation module 140a and is used to dissipate heat from the first light source module 130. Second air inlet E22 corresponds to other heat dissipation modules (e.g., the second heat dissipation module 180) and is used to dissipate heat from other heat-generating components (e.g., the second light source module 170). In this embodiment, the area of ​​second air inlet E21 is, for example, less than or equal to the area of ​​first air inlet E1, and the ratio of the area of ​​second air inlet E21 to the area of ​​first air inlet E1 can be, for example, between 0.5 and 1.

[0065] Furthermore, the projection lens 120 in this embodiment is specifically a short-throw projection lens, wherein the throw ratio (TR) of the projection lens 120 is, for example, less than 0.3, and the aforementioned throw ratio is the projection distance / projection screen width. Figure 1A As shown, in this embodiment, the projection lens 120 is located between the first side cover 113 and the second side cover 114 of the housing 110. That is, the optical axis X of the projection lens 120 is located, for example, in the middle of the housing 110, so the first region S1 and the second region S2 can be approximately the same size.

[0066] Please refer to this again. Figure 1AIn this embodiment, the projection device 100a further includes a light valve 125 and a heat dissipation module 127. The light valve 125 is disposed within the housing 110 and located between the rear cover 112 and the projection lens 120. The heat dissipation module 127 is disposed within the housing 110 and located in the first region S1. The heat dissipation module 127 is connected to the light valve 125 and is used to dissipate heat from the light valve 125. In one embodiment, the light valve 125 is, for example, a digital micromirror device (DMD), which is composed of tens of thousands of micromirrors that can automatically flip and adjust to the corresponding reflection angle, thereby reflecting the image beam to the projection lens 120. In one embodiment, the light valve 125 may also be a transmissive spatial light modulator, such as a transparent liquid crystal panel. The present invention does not limit the type or form of the light valve 125.

[0067] The first light source module 130 of this embodiment may include at least one light-emitting element for providing an illumination beam. For example, the first light source module 130 may include a plurality of laser diodes, light-emitting diodes, or combinations thereof arranged in an array, or may be other suitable solid-state illumination sources. In one embodiment, the light-emitting elements may include red light-emitting units, blue light-emitting units, green light-emitting units, or combinations thereof, which may emit red light, blue light, green light, or combinations thereof, respectively, to form an illumination beam. The projection lens 120 may include a combination of one or more optical lenses with refractive power, such as various combinations of non-planar lenses such as biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plano-convex lenses, or plano-concave lenses. In one embodiment, the projection lens 120 may include planar optical lenses and may project the image beam from the light valve 125 out of the projection device 100a by reflection or transmission.

[0068] In this embodiment, the projection device 100a further includes a light path guiding module 135, disposed within the housing 110. The first light source module 130 provides an illumination beam, while the light path guiding module 135 is disposed on the transmission path of the illumination beam to transmit the illumination beam to the light valve 125. In one embodiment, the light path guiding module 135 may include a lens, a reflector, or a combination thereof, for reflecting, refracting, or converging the light beam. For example, the lens may be a convex lens, a concave lens, a concave-convex lens, or a lens with a surface having multiple refractive powers, or a combination of the above lenses, but is not limited thereto.

[0069] Please refer to the following at the same time: Figure 1A and Figure 1B In this embodiment, the first air inlet E1 located on the lower cover 116 can be aligned with the first heat dissipation module 140a, which can improve heat dissipation efficiency. In one embodiment, the orthographic projection of the first heat dissipation module 140a on the lower cover 116 at least partially overlaps with the first air inlet E1. The area of ​​the first air inlet E1 can be, for example, equal to the area of ​​the air inlet surface 153 of the first fan 150a. On a reference plane parallel to the front cover 111, the first fan 150a is located between the light emitting part 117 and the first heat dissipation module 140a. The first light source module 130 is connected to the first heat dissipation module 140a, and the first heat dissipation module 140a is located between the first air inlet E1 and the first fan 150a. That is, the first fan 150a is located downstream of the first heat dissipation module 140a and between the first heat dissipation module 140a and the top cover 115, and in a non-side cover (first side cover 113) location. This improves the heat dissipation efficiency of the first heat dissipation module 140a for the first light source module 130, and the sound generated by the first fan 150a is less likely to be transmitted through the first side cover 113, effectively reducing noise. Compared to the prior art which requires two fans to dissipate heat from the light source module, the projection device 100a of this embodiment only uses the first fan 150a to dissipate heat from the light source module 130. The projection device 100a of this embodiment can reduce the number of fans used and reduce the power consumption of the projection device 100a. In addition, as Figure 1B As shown, the angle A between the normal extension direction D of the air inlet surface 153 of the first fan 150a and the first air inlet E1 is between 30 degrees and 150 degrees, for example, 90 degrees. That is, the first fan 150a lies horizontally in the first region S1 in a manner parallel to the upper cover 115 and the lower cover 116. In this embodiment, the first fan 150a may be, for example, an axial fan or a blower fan.

[0070] Furthermore, in this embodiment, the first heat dissipation module 140a is specifically designed as a three-dimensional vapor chamber (3DVC) heat dissipation module. Please also refer to... Figure 1A as well as Figure 1DThe base 142 of the first heat dissipation module 140a may be flat, having a first surface 141 and a second surface 143 opposite to each other. The first light source module 130 is connected to the first surface 141 of the base 142, while the first heat pipe 144 is directly and perpendicularly connected to the second surface 143 of the base 142, and the heat dissipation fins 146 are parallel to the base 142. The extension direction B of the first heat pipe 144 of the first heat dissipation module 140a is parallel to the optical axis X of the projection lens 120. That is, the heat dissipation fins 146 are parallel to the front cover 111 and the rear cover 112 (i.e., horizontally oriented), and the first heat pipe 144 is parallel to the optical axis X, which is beneficial for the heat dissipation fins 146 to have the largest frontal surface area. In other words, the design of the first heat dissipation module 140a in this embodiment avoids the space required by the bent heat pipe connected to the base in the prior art (i.e., the bent and flattened part of the heat pipe requires additional accommodation space). That is, there is no need to consider the space required by the bent heat pipe, thereby increasing the heat dissipation area of ​​the heat dissipation fins 146 (compared to the heat dissipation module of the prior art, the heat dissipation module 140a of this embodiment increases the heat dissipation area by about 32%), thereby achieving better heat dissipation efficiency in a limited space.

[0071] In one embodiment, the base 142 of the first heat dissipation module 140a and the first heat pipe 144 can be integrally formed, which can effectively reduce welding thermal resistance. In one embodiment, the material of the first heat dissipation module 140a can be a metal material with a thermal conductivity greater than 90 W / (mK), such as aluminum, copper, or stainless steel. In one embodiment, the base 142 of the first heat dissipation module 140a can also be a flat cavity (2-D vapor chamber), but is not limited thereto.

[0072] Furthermore, to improve heat dissipation efficiency, the projection device 100a in this embodiment may further include an air guide plate (first air guide plate) 161, disposed between the first air inlet E1 and the first heat dissipation module 140a, so that the airflow direction is from the first air inlet E1, the first heat dissipation module 140a to the first fan 150a, wherein the air guide plate 161 can prevent air backflow. The projection device 100a may further include an air guide plate (second air guide plate) 163, disposed between the second air inlet E2 (E21) and the first heat dissipation module 140a, and connecting the second air inlet E21 and the frame sidewall of the first fan 150a, for guiding cold air to the first heat dissipation module 140a. The projection device 100a may further include an air guide plate (third air guide plate) 165, disposed between the first heat dissipation module 140a and the first fan 150a, which can ensure that cold air directly cools the two air inlet surfaces (i.e., parallel to the X direction) of the first heat dissipation module 140a that are opposite to each other. In one embodiment, simulation experiments show that the design of the lower cover 116 having a first air inlet E1 and the first side cover 113 having a second air inlet E2 can effectively reduce the air inlet temperature and increase the airflow. In one embodiment, sound-absorbing cotton can also be attached to the air guide plates 161, 163, and 165 to absorb wind shearing noise, which can effectively reduce the noise generated when the fan is running.

[0073] Please refer to this again. Figure 1A and Figure 1B In this embodiment, the projection device 100a further includes a second light source module 170, a second heat dissipation module 180, and a second fan 190, located within the first region S1. The second heat dissipation module 180 and the second fan 190 can dissipate heat from the second light source module 170. The second light source module 170 may include at least one light-emitting element, which can be used to provide an illumination beam. For example, the second light source module 170 may include a plurality of laser diodes, light-emitting diodes, or combinations thereof arranged in an array, or may be other suitable solid-state illumination sources. In one embodiment, the light-emitting elements may include red light-emitting units, blue light-emitting units, green light-emitting units, or combinations thereof, which can respectively emit red light, blue light, green light, or combinations thereof to form an illumination beam.

[0074] Furthermore, the second heat dissipation module 180 in this embodiment includes at least one second heat pipe (a plurality of second heat pipes 182 are schematically shown) and a heat dissipation fin assembly 184 connecting the second heat pipes 182. The second light source module 170 is connected to the second heat pipes 182, and the second fan 190 is located between the heat dissipation fin assembly 184 and the second light source module 170. In one embodiment, the extension direction (Z direction) of the second heat pipes 182 may be the same as the extension direction (Z direction) of the first heat pipes 144. The arrangement direction (Y direction) of the plurality of second heat pipes 182 may be perpendicular to the arrangement direction (X direction) of the plurality of first heat pipes 144. The fin arrangement direction (Y direction) of the heat dissipation fin assembly 184 of the second heat dissipation module 180 may be perpendicular to the arrangement direction (X direction) of the plurality of heat dissipation fins 146 of the first heat dissipation module 140a. The configuration direction (parallel to the YZ plane) of the second fan 190 may be perpendicular to the configuration direction (parallel to the XZ plane) of the first fan 150a. To improve heat dissipation efficiency, the projection device 100a may also include an air guide plate 167 (fourth air guide plate), disposed between the second fan 190 and the second heat dissipation module 180. Cold air enters from the second air inlet E2 (E22) to cool the second light source module 170. Hot air can be drawn out by the system fans 138 and 139 located next to the second side cover 114 and discharged from the air outlet E3. The air guide plate 167 is provided in the path of the airflow through the second heat dissipation module 180 and the second fan 190, allowing the airflow to flow directly through the second heat dissipation module 180 for heat dissipation, thus avoiding airflow bypass. The second fan 190 and the system fans 138 and 139 may be, for example, axial fans or blowers.

[0075] Furthermore, the projection device 100a in this embodiment also includes a system fan 137, which is disposed inside the housing 110 and located between the light path guiding module 135 and the heat dissipation fin assembly 128 of the heat dissipation module 127. The heat dissipation fin assembly 128 is connected to a heat pipe 129, which can be connected to the base of the light valve 125 for heat dissipation of the light valve 125. In one embodiment, the system fan 137 may be, for example, an axial fan or a blower fan. To improve the heat dissipation effect, the projection device 100a may also include an air guide plate (fifth air guide plate) 169, which is disposed between the heat dissipation fin assembly 128 of the heat dissipation module 127 and the system fan 137. This allows cold air entering the housing 110 from the air inlet (not shown in the figure) on the rear cover 112 to be directly guided by the air guide plate 169 (without flowing through other heat-generating components) and drawn out by the system fan 137 to cool the heat dissipation fin assembly 128, thereby achieving a better heat dissipation effect.

[0076] Furthermore, the projection device 100a in this embodiment also includes a drive circuit board 155, disposed between the first heat dissipation module 140a and the top cover 115, which optimizes the space utilization of the projection device 100a. In one embodiment, the drive circuit board 155 may be, for example, a driver board for a light-emitting element or a printed circuit board (PCB), used to drive the first light source module 130 and the second light source module 170. Additionally, the projection device 100a may also include two speakers 175 and 177, disposed within the housing 110, and respectively located in the first region S1 and the second region S2. The two speakers 175 and 177 are disposed adjacent to the front cover 111, and the projection lens 120 is located between the two speakers 175 and 177.

[0077] In short, this embodiment utilizes the available space below the light-emitting portion 117 of the upper cover 115 to alter the internal airflow field of the projection device 100a, thereby reducing the size of the projection device 100a and effectively lowering the noise generated during fan operation. The first heat dissipation module 140a is, for example, designed as a three-dimensional uniform temperature heat dissipation module, which effectively reduces the volume of the heat dissipation module (by approximately 17% compared to existing heat dissipation modules), improving the space utilization of the projection device 100a and reducing its weight. Furthermore, because the first fan 150a is offset from the first side cover 113 and positioned inside the accommodating space S (between the first heat dissipation module 140a and the upper cover 115), the noise of the projection device 100a is reduced.

[0078] Other embodiments will be listed below for illustration. It must be noted that the following embodiments use the component designations and some content from the foregoing embodiments, employing the same designations to represent the same or similar components, and omitting descriptions of identical technical content. For explanations of the omitted parts, please refer to the foregoing embodiments; these will not be repeated in the following embodiments.

[0079] Figure 2 This is a front view schematic diagram of a projection device according to another embodiment of the present invention. Please also refer to... Figure 1B as well as Figure 2The projection device 100b in this embodiment is similar to the projection device 100a described above, except that the main difference lies in the following: In this embodiment, the first fan 150b has an exhaust surface 151' and an intake surface 153', wherein the exhaust surface 151' faces the upper cover 115, and the intake surface 153' faces the lower cover 116, and the angle A' between the normal extension direction D' of the intake surface 153' and the first air inlet E1 is between 30 degrees and 150 degrees, for example, between 30 degrees and 89 degrees. That is to say, the first fan 150b is placed at an angle relative to the upper cover 115 and the lower cover 116, i.e., it is placed horizontally, not horizontally parallel to the upper cover 115 and the lower cover 116. The first fan 150b is placed, for example, tilted towards the second side cover 114, so that the exhaust surface 151' of the first fan 150b can tilt towards the air outlet E3 on the second side cover 114, thereby achieving a better heat dissipation effect.

[0080] Figure 3 This is a schematic diagram of a first heat dissipation module according to another embodiment of the present invention. Please also refer to... Figure 1D as well as Figure 3 The first heat dissipation module 140b in this embodiment is similar to the first heat dissipation module 140a described above, except that the main difference is that in this embodiment, the base 142' of the first heat dissipation module 140b has a first surface 141' and a second surface 143' facing each other, wherein the first surface 141' is connected to the first light source module 130. The first heat dissipation module 140b also includes a plurality of auxiliary fins 148 disposed on the second surface 143', wherein the plurality of auxiliary fins 148 are perpendicular to the base 142'. That is to say, in this embodiment, in addition to having heat dissipation fins 146 parallel to the base 142', the first heat dissipation module 140b also has auxiliary fins 148 perpendicular to the base 142', thereby increasing the heat dissipation area.

[0081] In summary, the embodiments of the present invention have at least one of the following advantages or effects. In the design of the projection device of the present invention, the lower cover of the casing has a first air inlet, wherein the first light source module is connected to the first heat dissipation module, and the first heat dissipation module is located between the first air inlet and the first fan. That is, the first fan is located downstream of the airflow of the first heat dissipation module and between the first heat dissipation module and the upper cover, rather than at the side cover, which can improve the heat dissipation efficiency of the first heat dissipation module for the first light source module, and the sound generated by the first fan is less likely to be transmitted from the side cover, which can effectively reduce noise. Furthermore, the first heat pipe of the first heat dissipation module is perpendicular to the base, and the heat dissipation fins are parallel to the base. Therefore, compared with the bent heat pipes connected to the base in the prior art, the first heat dissipation module of the embodiments of the present invention does not need to consider the space occupied by the bent heat pipes, which can effectively increase the heat dissipation area of ​​the heat dissipation fins and increase the space utilization rate within the accommodating space. Furthermore, the exhaust surface and intake surface of the first fan face the upper cover and lower cover respectively, and the angle between the normal extension direction of the fan's intake surface and the first air inlet is between 30 degrees and 150 degrees. In other words, the first fan is not vertically positioned parallel to the side cover within the accommodating space, but rather lies horizontally / obliquely within the accommodating space. In short, the projection device of this invention has better heat dissipation, effectively reduces noise, and improves the space utilization of the projection device.

[0082] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. Any simple equivalent changes and modifications made in accordance with the claims and specification of the present invention are still within the scope of this patent. Furthermore, no embodiment or claim of the present invention needs to achieve all the objectives, advantages, or features disclosed in the present invention. In addition, the abstract and title of the invention are only used to assist in patent document retrieval and are not intended to limit the scope of the invention. Moreover, the terms "first," "second," etc., mentioned in this specification or claims are only used to name elements or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit of the number of elements.

Claims

1. A projection device, characterized by The projection device comprises a housing, a projection lens, a first light source module, a first heat dissipation module and a first fan, wherein: The housing comprises a front cover and a rear cover opposite to each other, a first side cover and a second side cover opposite to each other, and an upper cover and a lower cover opposite to each other, the first side cover and the second side cover are connected to the front cover and the rear cover respectively, the upper cover and the lower cover are connected to the front cover, the rear cover, the first side cover and the second side cover respectively to form a containing space, the lower cover has a first air inlet, the first side cover has a second air inlet, and the second side cover has an air outlet; The projection lens is arranged in the housing, and the projection lens has a setting direction to divide the containing space into a first area and a second area, the first air inlet and the second air inlet are located in the first area, and the air outlet is located in the second area; The first light source module, the first heat dissipation module and the first fan are located in the first area, wherein the first light source module is connected to the first heat dissipation module, and the first heat dissipation module is located between the first air inlet and the first fan; The first heat dissipation module comprises a base, at least one first heat pipe and a plurality of heat dissipation fins, the base is connected to the first light source module, the at least one first heat pipe is perpendicular to the base, and the plurality of heat dissipation fins are parallel to the base; and The first fan has an air outlet surface and an air inlet surface, the air outlet surface faces the upper cover, the air inlet surface faces the lower cover, and the angle between the normal line extension direction of the air inlet surface and the first air inlet is between 30 degrees and 150 degrees.

2. The projection apparatus according to claim 1, wherein The ratio of the area of the second air inlet to the area of the first air inlet is between 0.5 and 1.

3. The projection apparatus according to claim 1, wherein The projection device further comprises: An air deflector arranged between the first air inlet and the first heat dissipation module.

4. The projection apparatus according to claim 1, wherein The projection device further comprises: An air deflector arranged between the second air inlet and the first heat dissipation module.

5. The projection apparatus according to claim 1, wherein The projection device further comprises: An air deflector arranged between the first heat dissipation module and the first fan.

6. The projection apparatus according to claim 1, wherein The projection device further comprises: A second light source module, a second heat dissipation module and a second fan located in the first area, the second heat dissipation module comprises at least one second heat pipe and a heat dissipation fin group connected to the second heat pipe, the second light source module is connected to the at least one second heat pipe, and the second fan is located between the heat dissipation fin group and the second light source module.

7. The projection apparatus according to claim 6, wherein The projection device further comprises: An air deflector arranged between the second fan and the second heat dissipation module.

8. The projection apparatus according to claim 1, wherein The projection device further comprises a light valve and a heat dissipation module, The light valve is arranged in the housing and located between the rear cover and the projection lens; and The heat dissipation module is arranged in the housing and located in the first area, and the heat dissipation module is connected to the light valve.

9. The projection apparatus according to claim 8, wherein, The projection device further comprises: A light path guiding module arranged in the housing, the first light source module is used to provide an illumination light beam, and the light path guiding module is arranged on the transmission path of the illumination light beam to transmit the illumination light beam to the light valve.

10. The projection apparatus according to claim 9, wherein, The projection device further comprises: a system fan disposed in the casing and located between the light path guiding module and the heat dissipation fin group of the heat dissipation module.

11. The projection apparatus according to claim 10, wherein, The projection device further comprises: a baffle disposed between the heat dissipation fin group of the heat dissipation module and the system fan.

12. The projection apparatus according to claim 1, wherein The extension direction of the at least one first heat pipe of the first heat dissipation module is parallel to the optical axis of the projection lens.

13. The projection apparatus according to claim 1, wherein The base of the first heat dissipation module is integrally formed with the at least one first heat pipe.

14. The projection apparatus according to claim 1, wherein The base of the first heat dissipation module has a first surface and a second surface opposite to each other, the first surface is connected to the first light source module, and the first heat dissipation module further comprises a plurality of auxiliary fins disposed on the second surface.

15. The projection apparatus according to claim 14, wherein, The plurality of auxiliary fins are perpendicular to the base.

16. The projection apparatus of claim 1, wherein The projection device further comprises a driving circuit board disposed between the first heat dissipation module and the upper cover.

17. The projection apparatus of claim 1, wherein The projection device further comprises: two speakers disposed in the casing and located in the first region and the second region respectively, the two speakers are disposed adjacent to the front cover, and the projection lens is located between the two speakers.

18. The projection apparatus of claim 1, wherein The projection lens is an ultra-short focus projection lens.

19. The projection apparatus of claim 1, wherein The upper cover has a light output portion, the light output portion is located on the transmission path of the image light beam from the projection lens, and on a reference plane parallel to the lower cover, the first fan is located between the light output portion and the first heat dissipation module.

20. The projection apparatus of claim 1, wherein The projection lens is located between the first side cover and the second side cover of the casing.

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