Heat dissipation module and projection device

Abstract

A heat dissipation module is adapted to dissipate heat from a heat source. The heat dissipation module includes an air flow generator, a heat dissipation base plate, a heat dissipation member, a baffle and a heat pipe. The heat dissipation base plate is connected to the heat source. The heat pipe is connected between the heat dissipation base plate and the heat dissipation member for transferring heat energy from the heat source to the heat dissipation member. The heat dissipation member includes a body portion and a plurality of first fins. The plurality of first fins are arranged around an outer periphery of the body portion. The plurality of first fins and the body portion form a receiving space. The air flow generator has an axis of rotation and is received in the receiving space and connected to the body portion. The baffle is connected to the plurality of first fins and has an opening aligned with an air inlet surface of the air flow generator. The opening is located on the axis of rotation. In a reference plane perpendicular to the axis of rotation, a projection of each of the plurality of first fins at least partially does not overlap a projection of the air flow generator. A projection of the baffle overlaps a plurality of projections of the plurality of first fins. A projection device is also provided. Thus, a better heat dissipation effect is achieved.

Description

Technical Field

[0001] This invention relates to a heat dissipation module, and more particularly to a projection device using this heat dissipation module. Background Technology

[0002] With the advancement of technology, the size of projection devices has gradually shrunk, and even portable projection devices have been developed. However, due to the different appearance designs of projection devices, it is necessary to consider whether the heat dissipation module in the projection device can conduct heat well, and also to pay attention to whether the heat dissipation module will cause noise problems.

[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 known technologies that are not known to those skilled in the art. The content disclosed in the "Background Art" paragraph does not mean that the content or the problems to be solved by one or more embodiments of this invention were known or recognized by those skilled in the art before this application was filed. Summary of the Invention

[0004] This invention provides a heat dissipation module that has good heat dissipation effect and low noise.

[0005] The present invention provides a projection device including the above-mentioned heat dissipation module.

[0006] Other objects and advantages of the present invention can be further understood from the technical features disclosed herein.

[0007] To achieve one, some, or all of the above-mentioned objectives, or other objectives, an embodiment of the present invention provides a heat dissipation module suitable for dissipating heat from a heat source. The heat dissipation module includes an airflow generator, a heat dissipation substrate, a heat sink, a baffle, and a heat pipe. The heat dissipation substrate is connected to the heat source. The heat pipe connects the heat dissipation substrate and the heat sink to transfer thermal energy from the heat dissipation substrate to the heat sink. The heat sink includes a body and a plurality of first fins. The plurality of first fins surround the outer periphery of the body and form an accommodating space with the body. The airflow generator has a rotation axis and is housed within the accommodating space and connected to the body. The baffle is connected to the plurality of first fins and has an opening aligned with the air inlet surface of the airflow generator. The opening is located on the rotation axis, and on a reference plane perpendicular to the rotation axis, the orthographic projection of each of the plurality of first fins does not at least partially overlap with the orthographic projection of the airflow generator.

[0008] To achieve one, some, or all of the above-mentioned objectives, or other objectives, an embodiment of the present invention provides a projection device, including a housing, a light source module, an optical engine module, a projection lens, and the aforementioned heat dissipation module. The heat dissipation module, light source module, optical engine module, and projection lens are disposed within the housing. The housing has opposing first and second cover plates and a cylindrical portion connecting the first and second cover plates, the cylindrical portion having an air inlet adjacent to the first cover plate and an air outlet adjacent to the second cover plate. The light source module provides an illumination beam. The optical engine module is disposed in the transmission path of the illumination beam, and includes an optical valve for converting the illumination beam into an image beam. The projection lens is located in the transmission path of the image beam from the optical valve, for projecting the image beam out of the projection device.

[0009] Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. In the projection device of the present invention, the heat dissipation module is adapted to dissipate heat from the heat source. For example, ambient air outside the housing of the projection device can flow into the housing through the air inlet, enter the air inlet surface of the airflow generator through the opening of the baffle, and then enter the multiple airflow channels of the heat sink through the airflow generator, and flow out of the housing through the air outlet to achieve a better heat dissipation effect.

[0010] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below, and detailed descriptions are provided in conjunction with the accompanying drawings. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of a projection device according to an embodiment of the present invention.

[0012] Figure 2A yes Figure 1 A three-dimensional schematic diagram of the projection device.

[0013] Figure 2B yes Figure 1 A top view of the projection device.

[0014] Figure 3A This is a schematic diagram of a heat dissipation module according to an embodiment of the present invention.

[0015] Figure 3B yes Figure 3A A disassembled side view of the heat dissipation module.

[0016] Figure 4 and Figure 5 yes Figure 3A The 3D diagram showing the disassembled components of the heat dissipation module is omitted.

[0017] Figure 6 yes Figure 3A A cross-sectional view of the heat dissipation module.

[0018] Figure 7 yes Figure 3A The heat dissipation module is shown in a front view diagram with some components omitted.

[0019] Figure 8A This is a schematic diagram of a heat dissipation module according to another embodiment of the present invention.

[0020] Figure 8B yes Figure 8A A schematic diagram of the heat dissipation module from another perspective.

[0021] Figure 9A This is a schematic diagram of a heat dissipation module according to another embodiment of the present invention.

[0022] Figure 9B yes Figure 9A A schematic diagram of the heat dissipation module from another perspective.

[0023] Figure 9C yes Figure 9A A front view of the heat dissipation module.

[0024] Figure 10 This is a schematic diagram of a heat dissipation module according to another embodiment of the present invention.

[0025] Figure 11 This is a schematic diagram of a heat dissipation module according to another embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures

[0027] 50: Projection device

[0028] 51: Casing

[0029] 511: First cover plate

[0030] 512: Second cover plate

[0031] 513: Cylindrical part

[0032] 5131: First shell component

[0033] 5132: Second shell

[0034] 52: Light Source Module

[0035] 53: Optomechanical Module

[0036] 531: Light valve

[0037] 54: Projection lens

[0038] 100, 100B, 100C, 100D, 100E: Heat dissipation modules

[0039] 110, 110C, 110D: Airflow generator

[0040] 1101, 1101C: Air inlet side

[0041] 1102: Vent

[0042] 111: Backplate

[0043] 120: Heat dissipation substrate

[0044] 130, 130C, 130E: Heatsink

[0045] 131, 131C, 131D, 131E: Main body part

[0046] 132, 132C, 1321C, 1322C, 132E: First fin

[0047] 13: End

[0048] 132a: Extension

[0049] 133E: Third fin

[0050] 140, 140B, 140C: Baffle

[0051] 141, 141C: Open

[0052] 142B: Second fin

[0053] 150: Heat pipe

[0054] A1: Air Inlet

[0055] A2: Air vent

[0056] A3: Light outlet

[0057] C1: Storage space

[0058] D1, D2: Length

[0059] E1, E2, E3: Light-emitting elements

[0060] F1: Fan Blade

[0061] F11: First End

[0062] F12: Second end

[0063] G1: Spacing

[0064] H1: First opening

[0065] H2: Second opening

[0066] I1: Air inlet direction

[0067] I2: Airflow direction

[0068] K1, K2: Diameter

[0069] L: Rotation axis

[0070] LB: Illumination beam

[0071] LI: Image Beam

[0072] M1: Reference Extension Line

[0073] M2, M3, M3': Extension lines

[0074] P1, P1': Airflow channels

[0075] Q1: Spacing

[0076] R1: Rotation direction

[0077] S1, S1': Through holes

[0078] X, Y, Z: Direction

[0079] α: Angle

[0080] θ, β: included angle. Detailed Implementation

[0081] 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 accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the present invention.

[0082] Figure 1 This is a schematic diagram of a projection device according to an embodiment of the present invention. Figure 2A yes Figure 1 A three-dimensional schematic diagram of the projection device. Figure 2B yes Figure 1 A top view of the projection device. It should be noted that... Figure 2A and Figure 2B The X, Y, and Z directions are marked to show the configuration relationship of the components in the drawing. The X, Y, and Z directions intersect each other perpendicularly, but are not limited to this. Figures 1 to 2B Some irrelevant structures will be omitted to facilitate the display and identification of the components to be described.

[0083] Please refer to Figures 1 to 2BThe projector 50 of this embodiment includes a housing 51, a light source module 52, an optical engine module 53, and a projection lens 54. The light source module 52 provides an illumination beam LB. The optical engine module 53 is disposed in the transmission path of the illumination beam LB and includes an optical valve 531 for converting the illumination beam LB into an image beam LI. The projection lens 54 is located in the transmission path of the image beam LI from the optical valve 531 and projects the image beam LI from the projector 50 onto a projection target (not shown), such as a screen or wall.

[0084] The light valve 531 is, for example, a reflective light modulator such as a liquid crystal on silicon panel (LCoSpanel) or a digital micromirror device (DMD). In some embodiments, the light valve 531 can also be a transmissive light modulator such as a transparent liquid crystal panel, an electro-optic modulator, a magneto-optic modulator, or an acousto-optic modulator (AOM). This invention does not limit the type or form of the light valve 531. The detailed steps and implementation of the method by which the light valve 531 converts the illumination beam LB into the image beam LI are sufficiently taught, suggested, and illustrated by knowledge of the art and therefore will not be elaborated further. In different embodiments, the number of light valves 531 can be designed to be one to three, and this invention is not limited thereto.

[0085] The projection lens 54 may include, for example, a combination of one or more optical lenses with refractive power, such as various combinations of non-planar lenses including biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plano-convex lenses, and plano-concave lenses. In some embodiments, the projection lens 54 may also include planar optical lenses that project the image beam L1 from the light valve 531 onto the projection target. The present invention does not limit the type or form of the projection lens 54.

[0086] Specifically, the housing 51 has a first cover plate 511, a second cover plate 512, and a cylindrical portion 513 connecting the first cover plate 511 and the second cover plate 512. The first cover plate 511 is provided with a light outlet A3, and the image beam L1 from the projection lens 54 is projected from the light outlet A3 of the first cover plate 511 to the outside of the projection device 50.

[0087] The light source module 52, the optical engine module 53, and at least a portion of the projection lens 54 are disposed within the housing 51. In this embodiment, the projection lens 54 is entirely disposed within the housing 51. The cylindrical portion 513 has a cylindrical appearance and is assembled from a first housing member 5131 and a second housing member 5132, for example, two housing members together forming a hollow cylinder. In other embodiments, a single housing member can also form a hollow cylinder. The cylindrical portion 513 has an air inlet A1 adjacent to the first cover plate 511 and an air outlet A2 adjacent to the second cover plate 512. The air inlet A1 includes a plurality of first openings H1 surrounding the first cover plate 511, and the air outlet A2 includes a plurality of second openings H2 surrounding the second cover plate 512, for allowing ambient air to flow in through the plurality of first openings H1 of the air inlet A1 and flow out through the plurality of second openings H2 of the air outlet A2.

[0088] In this embodiment, the projection device 50 further includes a heat dissipation module 100, which is disposed within the housing 51. The heat dissipation module 100 is adapted to dissipate heat from a heat source. The heat source may be, for example, the light-emitting elements E1, E2, and E3 of the light source module 52, wherein each light-emitting element E1, E2, and E3 is, for example, at least one light-emitting diode or at least one laser diode, used to provide a light beam of at least one color, but the invention is not limited thereto. In other embodiments, the light source module 52 may, for example, be configured with only one light-emitting element. The heat source may also be the light valve 531 of the optomechanical module 53.

[0089] Generally, miniature projectors are limited in their fan selection; due to the fan bezel, only smaller fans can be used for the same diameter, thus increasing noise. The projection device of this invention can solve the above problems.

[0090] Figure 3A This is a schematic diagram of a heat dissipation module according to an embodiment of the present invention. Figure 3B yes Figure 3A A disassembled side view of the heat dissipation module. Figure 4 and Figure 5 yes Figure 3A The 3D diagram showing the disassembled components of the heat dissipation module is omitted. Figure 6 yes Figure 3A A cross-sectional view of the heat dissipation module. It should be noted that... Figures 3A to 6 The X, Y, and Z directions are marked to show the configuration relationship of the components in the drawing. The X, Y, and Z directions intersect each other perpendicularly, but are not limited to this. Figures 3A to 6 Some irrelevant structures will be omitted to facilitate the display and identification of the components to be described.

[0091] Please refer to Figure 3AIn this embodiment, the heat dissipation module 100 includes an airflow generator 110, a heat dissipation substrate 120, a heat sink 130, a baffle 140, and a heat pipe 150. In this embodiment, the airflow generator 110 is, for example, a frameless blower. In this embodiment, the heat dissipation substrate 120 is a substrate made of metal, the baffle 140 is a plate made of metal, and metal materials have temperature uniformity and thermal conductivity effects. The heat sink 130 is a heat dissipation fin, but the invention is not limited to these. In other embodiments, the heat dissipation substrate 120 and the baffle 140 may also be made of other materials with high thermal conductivity.

[0092] Under the above configuration, the heat dissipation module 100 uses a frameless blower as an airflow generator 110 to achieve the heat dissipation effect, which allows for more flexible system configuration, increases fan blade size, and reduces noise.

[0093] In one embodiment, Figure 3A The heat dissipation module 100 is suitable for application Figure 2A The projection device 50 of this embodiment can reduce noise by 2 dB(A) and maintain the component temperature within an appropriate range compared to known projection devices, but the present invention is not limited thereto.

[0094] In detail, the heat dissipation substrate 120 is configured to be connected to a heat source. In this embodiment, the heat source is, for example, the light-emitting element of the light source module 52. The heat dissipation substrate 120 is connected to the heat source by a thermal interface material (TIM). The thermal interface material (TIM) is, for example, thermal grease or thermal pad, but the present invention is not limited thereto.

[0095] Please refer to Figure 2B and Figure 3A In this embodiment, the heat dissipation substrate 120 is located between the projection lens 54 and the baffle 140. The heat sink 130 is disposed adjacent to the second cover plate 512. The heat pipe 150 is connected between the heat dissipation substrate 120 and the heat sink 130 to transfer heat energy from the heat dissipation substrate 120 to the heat sink 130. The heat dissipation substrate 120 is disposed close to the first cover plate 511, and the airflow generator 110 is close to the second cover plate 512 and located between the baffle 140 and the second cover plate 512.

[0096] For more details, please refer to Figures 3A to 4In this embodiment, the heat sink 130 includes a body portion 131 and a plurality of first fins 132. The first fins 132 are disposed around the outer periphery of the body portion 131. Specifically, the first fins 132 extend from the body portion 131 to the circumferential direction of the airflow generator 110, and the first fins 132 and the body portion 131 form an accommodating space C1. The airflow generator 110 has a rotating shaft located on a rotation axis L, for example parallel to the Y-axis. The first fins 132 radiate outwards from the rotation axis L, surrounding the airflow generator 110. Each first fin 132 has two opposite ends (not labeled). One end of each first fin 132 is connected to the body portion 131, and the other end extends away from the body portion 131. The other end of each first fin 132 has an extension 132a extending in a direction parallel to the rotation axis L (positive Y-axis direction), thus forming the receiving space C1 with the body portion 131. The airflow generator 110 is housed within the receiving space C1 and connected to the body portion 131. A baffle 140 is connected to the extension 132a of each first fin 132, and the connection method is, for example, locking, welding, or adhesive, etc., but the invention is not limited to these methods. The baffle 140 is annular and has an opening 141, which aligns with the air inlet surface 1101 of the airflow generator 110. In one embodiment, please refer to... Figure 2A The first fin 132 is located between the baffle 140 and the second cover plate 512.

[0097] In this embodiment, the opening 141 is circular and located on the rotation axis L. On a reference plane perpendicular to the rotation axis L (e.g., the XZ plane), the orthographic projections of the plurality of first fins 132 onto the reference plane partially overlap with the orthographic projection of the airflow generator 110 onto the reference plane. The orthographic projection of the baffle 140 onto the reference plane overlaps with a portion of the orthographic projection of each of the first fins 132 onto the reference plane. The orthographic projection of the airflow generator 110 onto the reference plane does not overlap with the orthographic projection of the extension 132a of each of the first fins 132 onto the reference plane. That is, on the reference plane perpendicular to the rotation axis L, at least a portion (e.g., the extension 132a) of the orthographic projection of each of the plurality of first fins 132 does not overlap with the orthographic projection of the airflow generator 110.

[0098] In detail, in this embodiment, each of the plurality of first fins 132 is arranged perpendicular to the axis of rotation L. The plurality of first fins 132 are spaced apart from each other along the circumferential direction of the body portion 131 to form a plurality of airflow channels P1. Any two adjacent plurality of first fins 132 are separated by one of the plurality of airflow channels P1. In this embodiment, the airflow generated by the airflow generator 110 enters the air inlet surface 1101 of the airflow generator 110 through the opening 141 of the baffle 140, and then enters the plurality of airflow channels P1 of the heat sink 130 from the airflow generator 110. The airflow direction I1 of the air inlet surface of the airflow generator 110 (refer to...) Figure 2B ) and the air outlet direction I2 (reference) from the airflow channel P1 Figure 2B The included angle is approximately 90°, but the present invention is not limited thereto.

[0099] Please refer to Figure 5 In this embodiment, the airflow generator 110 includes a back plate 111 and a fan blade portion (not labeled). The back plate 111 is located on the rotation axis L and connected to the main body portion 131, so that the airflow generator 110 is fixed to the heat sink 130. Furthermore, the back plate 111 is located on the side of the airflow generator 110 away from the air inlet surface 1101, that is, the airflow generated by the airflow generator 110 will not reach the back plate 111 before passing the fan blade portion from the air inlet surface 1101.

[0100] Please refer to Figure 6 In this embodiment, the baffle 140 and the fan blades of the airflow generator 110 have a distance G1 in a direction parallel to the axis of rotation L (e.g., the positive Y-axis direction or the negative Y-axis direction). For example, the distance G1 is less than 0.3 mm to prevent airflow from flowing out of the air outlet 1102 of the airflow generator 110 and then flowing back. In one embodiment, the baffle 140 is very close to the airflow generator 110, but does not contact it, to avoid interference from the baffle 140 when the fan blades of the airflow generator 110 rotate.

[0101] Please refer to Figure 2B In this embodiment, the second opening H2 (air outlet A2) of the cylindrical portion 513 corresponds to multiple airflow channels P1. Specifically, ambient air outside the housing 51 flows into the housing 51 through the first opening H1 (air inlet A1), enters the air inlet surface 1101 of the airflow generator 110 through the opening 141 of the baffle 140, and then enters the multiple airflow channels P1 of the heat sink 130 through the airflow generator 110, and flows out of the housing 51 through the air outlet A2.

[0102] In this embodiment, the heat dissipation substrate 120 includes a first plate 121 and a second plate 122 connected together, with an included angle α of 90° between the first plate 121 and the second plate 122. However, the invention is not limited to this. In this embodiment, on a reference plane perpendicular to the aforementioned axis of rotation L (e.g., the XZ plane), the orthographic projection of the heat source (e.g., the light-emitting elements E1, E2, and E3 of the light source module 52) disposed on the heat dissipation substrate 120 is superimposed on the orthographic projection of the airflow generator 110. That is, the heat source disposed on the heat dissipation substrate 120 is actually located on the path between the airflow entering the housing 51 from the air inlet A1 and the airflow generator 110 of the heat dissipation module 100, thus achieving partial heat dissipation due to the airflow.

[0103] Figure 7 yes Figure 3A The front view diagram of some components of the heat dissipation module is omitted. It should be noted that... Figure 7 The X, Y, and Z directions are marked to show the arrangement of components in the drawing. These directions are perpendicular to each other, but not limited to this. Please refer to [reference needed]. Figure 7 In this embodiment, on a reference plane perpendicular to the aforementioned axis of rotation L (e.g., the XZ plane), the orthographic projection of the opening 141 overlaps with and is smaller than the orthographic projection of the airflow generator 110. In other words, the radius K1 of the opening 141 is smaller than the radius K2 of the airflow generator 110, but the present invention is not limited thereto.

[0104] Other embodiments will be listed below for illustration. It must be noted that the following embodiments use the component reference numerals and some content from the foregoing embodiments, with the same reference numerals representing the same or similar components, and descriptions of identical technical content omitted. For explanations of the omitted parts, please refer to the foregoing embodiments; these will not be repeated in the following embodiments.

[0105] Figure 8A This is a schematic diagram of a heat dissipation module according to another embodiment of the present invention. Figure 8B yes Figure 8A A schematic diagram of the heat dissipation module from another perspective. Please refer to... Figure 8A and Figure 8B In this embodiment, the heat dissipation module 100B and Figure 3A The heat dissipation module 100 is slightly different, mainly in that the baffle 140B includes multiple second fins 142B, which are arranged at intervals and are respectively located in multiple airflow channels P1.

[0106] In this way, the second fin 142B of the baffle 140B and the first fin 132 of the heat sink 130 are staggered, making the fins denser and increasing the heat dissipation area. The advantage of this design is that it can improve the difference in spacing between adjacent first fins 132 near and far from the center.

[0107] In this embodiment, the second fin 142B extends from the baffle 140B toward the body 131 of the heat sink 130 along an extending direction (negative Y-axis direction), parallel to the rotation axis L. In this extending direction, the length D2 of the second fin 142B of the baffle 140B is less than the length D1 of the first fin 132 of the heat sink 130. The second fins 142B are arranged at intervals, for example, perpendicular to the rotation axis L. This design of the second fins 142B increases the heat dissipation area.

[0108] Figure 9A This is a schematic diagram of a heat dissipation module according to another embodiment of the present invention. Figure 9B yes Figure 9A A schematic diagram of the heat dissipation module from another perspective. Figure 9C yes Figure 9A A front view of the heat dissipation module. Please refer to... Figures 9A to 9C In this embodiment, the airflow generator 110C of the heat dissipation module 100C includes a plurality of fan blades F1, which are arranged around a rotation axis L. The fan blade portion is adapted to rotate about the rotation axis L along a rotation direction R1, and each of the plurality of fan blades F1 is inclined in a direction opposite to the rotation direction R1. That is, the plurality of fan blades F1 of the airflow generator 110C are backward-curved fan blades, but are not limited thereto.

[0109] In this embodiment, on a reference plane perpendicular to the axis of rotation L, the orthographic projection of the airflow generator 110C is completely located within the orthographic projection of the body portion 131C. In other words, the orthographic projection of the airflow generator 110C does not overlap with the orthographic projections of the plurality of first fins 132C.

[0110] Please refer to Figure 9C In this embodiment, a plurality of first fins 132C are arranged around the airflow generator 110C, and each of the plurality of first fins 132C does not pass through the rotation axis L in the direction of extension from near the rotation axis L away from the rotation axis L. The advantage of this design is that it can effectively reduce the flow resistance of the active airflow generator 110C, reduce the pressure at the tip of the first fins 132C, improve high-frequency whistling noise and overall noise, and increase the airflow rate.

[0111] In this embodiment, multiple first fins 132C are arranged at intervals along the circumferential direction of the body portion 131C to form multiple airflow channels P1'. Any two adjacent multiple first fins 132C are connected by one of the multiple airflow channels P1', and the airflow generated by the airflow generator 110C can flow out through the multiple airflow channels P1'.

[0112] In this embodiment, each of the plurality of first fins 132C has an end 13 near the axis of rotation L. A reference extension line M1 passes through the end 13 and the axis of rotation L. The reference extension line M1 and the first fin 132C corresponding to the end 13 have an angle θ, which is greater than 0 degrees and less than 90 degrees. In other words, Figure 9C The multiple first fins 132C are not radial structures formed with the axis of rotation L as the center.

[0113] In this embodiment, each of the plurality of fan blades F1 has a fan blade orthographic projection on a reference plane perpendicular to the rotation axis L. The fan blade orthographic projection has a first end F11 near the rotation axis L and a second end F12 away from the rotation axis L. The first end F11 and the second end F12 of the fan blade orthographic projection are connected by a straight line. The extension line M2 of the straight line of the fan blade orthographic projection has an angle β between it and the two extension lines M3, M3' of the two orthographic projections of two of the plurality of first fins 132C on the reference plane. The angle β is between 80° and 100°. Two of the plurality of first fins 132C are, for example, first fins 1321C and 1322C, but are not limited thereto. It should be further noted that the shape of the fan blade F1 can be flat or non-flat. Non-flat shapes include, for example, curved surfaces. The advantage of this design is that the large spacing between adjacent first fins 132C can effectively reduce the flow resistance of the active airflow generator 110C to improve performance, reduce turbulence generation and reduce noise, and at the same time reduce the impedance of the heat sink 130C to increase the flow rate generated by the active cooling module 100C.

[0114] In this embodiment, each of the plurality of fan blades F1 has a distance Q1 between its end F12, which is away from the axis of rotation L, and each of the plurality of adjacent heat dissipation fins 132C. The distance Q1 is greater than or equal to 5 mm, but is not limited thereto. The advantage of this design is that when the included angle θ is close to 90°, the radial airflow can generate an airflow channel P1' along the airflow at each position, and the distance between the fan blades F1 and the first fins 132C can be reduced to achieve better space utilization.

[0115] Figure 10 This is a schematic diagram of a heat dissipation module according to another embodiment of the present invention. Please refer to it. Figure 10 In this embodiment, the heat dissipation module 100D and Figure 9A The heat dissipation module 100C is slightly different, mainly in that: the body part 131D has two through holes S1, which are aligned with the air inlet surface of the airflow generator 110D. The air inlet surface can be referred to as Figure 9A The air inlet surface 1101C. The area of ​​the two through holes S1 is smaller than the area of ​​the baffle opening, which can be referenced. Figure 9A The baffle 140C has an opening 141C. The two through holes S1 can be used as air inlets to improve heat dissipation.

[0116] Figure 11 This is a schematic diagram of a heat dissipation module according to another embodiment of the present invention. Please refer to it. Figure 11 In this embodiment, the heat dissipation module 100E and Figure 10 The heat dissipation module 100D is slightly different, mainly in that the heat sink 130E includes multiple third fins 133E, which are disposed in two through holes S1', and both ends of each third fin 133E are connected to the main body 131E. The first fin 132E, the third fin 133E and the main body 131E have a similar structure. Figure 4 The accommodating space C1 is used to accommodate the airflow generator 110D.

[0117] In summary, the embodiments of the present invention have at least one of the following advantages or effects. In the projection device of the present invention, the heat dissipation module is suitable for dissipating heat from the heat source. For example, ambient air outside the housing of the projection device can flow into the housing through the air inlet, enter the air inlet surface of the airflow generator through the opening of the baffle, and then enter the multiple airflow channels of the heat sink through the airflow generator, and flow out of the housing through the air outlet to achieve a better heat dissipation effect. In addition, the heat dissipation module uses a frameless airflow generator to achieve the heat dissipation effect, which allows for more flexible system configuration, increases the fan blade size, and reduces noise. Furthermore, the baffle is very close to the airflow generator to prevent the airflow from flowing out of the airflow generator and then flowing back.

[0118] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All simple equivalent changes and modifications made in accordance with the claims and specification of the present invention are still within the scope of the patent coverage of the present invention. 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 are only used to assist in patent document retrieval and are not intended to limit the scope of the invention. Furthermore, 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 heat dissipation module suitable for dissipating heat from a heat source, the heat dissipation module comprising an airflow generator, a heat dissipation substrate, a heat sink, a baffle, and a heat pipe; wherein The heat dissipation substrate is connected to the heat source; The heat pipe is connected between the heat dissipation substrate and the heat dissipation component, and is used to transfer the heat energy of the heat source from the heat dissipation substrate to the heat dissipation component. The heat sink includes a body and a plurality of first fins, the plurality of first fins being disposed around the outer periphery of the body and the plurality of first fins and the body forming an accommodating space; The airflow generator has a rotating axis and is housed within the accommodating space and connected to the main body; and The baffle is connected to the plurality of first fins and has an opening aligned with the air inlet surface of the airflow generator, wherein The opening is located on the axis of rotation, on a reference plane perpendicular to the axis of rotation. The orthographic projection of each of the plurality of first fins does not at least partially overlap with the orthographic projection of the airflow generator. The orthographic projection of the baffle overlaps with the plurality of orthographic projections of the plurality of first fins. The airflow generator includes a back plate and a fan blade section. The baffle and the fan blade of the airflow generator are spaced apart on the axis of rotation. The back plate is located on the axis of rotation and connected to the body of the heat sink, and the back plate is located on the side of the airflow generator away from the air inlet surface. The opening of the baffle is configured to allow airflow to enter the air inlet surface of the airflow generator, and the airflow is introduced by the airflow generator into the multiple airflow channels between the plurality of first fins.

2. The heat dissipation module as described in claim 1, characterized in that, On the reference plane perpendicular to the axis of rotation, the orthographic projections of the openings overlap and are smaller than the orthographic projection of the airflow generator.

3. The heat dissipation module as described in claim 1, characterized in that, Each of the plurality of first fins is configured perpendicular to the axis of rotation, and the plurality of first fins are spaced apart from each other along the circumferential direction of the body to form the plurality of airflow channels, with one of the plurality of airflow channels between any two adjacent plurality of first fins.

4. The heat dissipation module as described in claim 3, characterized in that, The baffle includes a plurality of second fins, which are spaced apart from each other and respectively located in the plurality of airflow channels.

5. The heat dissipation module as described in claim 4, characterized in that, Each of the plurality of second fins extends from the baffle toward the body portion of the heat sink along an extending direction parallel to the axis of rotation, wherein the length of each of the plurality of second fins is less than the length of each of the plurality of first fins in the extending direction.

6. The heat dissipation module as described in claim 1, characterized in that, The spacing is less than 0.3 mm.

7. The heat dissipation module as described in claim 1, characterized in that, The airflow generator is a frameless blower.

8. The heat dissipation module as described in claim 1, characterized in that, On the reference plane perpendicular to the axis of rotation, the orthographic projection of the heat source disposed on the heat dissipation substrate overlaps with the orthographic projection of the airflow generator.

9. The heat dissipation module as described in claim 1, characterized in that, The fan blade portion of the airflow generator includes a plurality of fan blades arranged around the axis of rotation. The fan blade portion is adapted to rotate in a rotation direction with the axis of rotation as the center, and each of the plurality of fan blades is inclined in a direction opposite to the rotation direction.

10. The heat dissipation module as described in claim 9, characterized in that, The plurality of first fins are arranged around the airflow generator, and each of the plurality of first fins does not pass through the axis of rotation in an extension direction from near the axis of rotation toward away from the axis of rotation.

11. The heat dissipation module as described in claim 9, characterized in that, Each of the plurality of first fins has an end near the axis of rotation, a reference extension line passing through the end and the axis of rotation, and the reference extension line having an angle greater than 0 degrees and less than 90 degrees with the first fin corresponding to the end.

12. The heat dissipation module as described in claim 9, characterized in that, Each of the plurality of fan blades has a blade orthographic projection on the reference plane perpendicular to the axis of rotation. The blade orthographic projection has a first end near the axis of rotation and a second end away from the axis of rotation. A straight line is formed between the first end and the second end of the blade orthographic projection. The extension of this straight line intersects only two of the two extension lines of the two orthographic projections of the plurality of first fins on the reference plane at an angle of between 80 degrees. Up to 100 The included angle.

13. The heat dissipation module as described in claim 9, characterized in that, Each of the plurality of fan blades has a spacing between its end away from the axis of rotation and each of the plurality of adjacent first fins, the spacing being greater than or equal to 5 millimeters.

14. The heat dissipation module as described in claim 10, characterized in that, The plurality of first fins are arranged at intervals along the circumferential direction of the body to form a plurality of airflow channels, and one of the plurality of airflow channels is located between any two adjacent plurality of first fins.

15. The heat dissipation module as described in claim 1, characterized in that, On the reference plane perpendicular to the axis of rotation, the orthographic projection of the airflow generator lies entirely within the orthographic projection of the main body.

16. The heat dissipation module as described in claim 15, characterized in that, The main body has two through holes aligned with the air inlet surface of the airflow generator, and the area of ​​the two through holes is smaller than the area of ​​the opening.

17. The heat dissipation module as described in claim 16, characterized in that, The heat sink includes a plurality of third fins disposed in the two through holes, and the plurality of first fins, the third fins and the body portion constitute the accommodating space.

18. A projection device, comprising a housing, a light source module, an optical engine module, a projection lens, and a heat dissipation module as described in any one of claims 1 to 17, wherein... The heat dissipation module, the light source module, the optical engine module, and the projection lens are disposed within the housing; The housing has a first cover plate, a second cover plate, and a cylindrical portion connected between the first cover plate and the second cover plate. The cylindrical portion has an air inlet adjacent to the first cover plate and an air outlet adjacent to the second cover plate. The light source module is used to provide an illumination beam; The optomechanical module is configured along the transmission path of the illumination beam, and the optomechanical module includes an optical valve for converting the illumination beam into an image beam; and The projection lens is located on the transmission path of the image beam from the light valve, and is used to project the image beam out of the projection device.

19. The projection device as claimed in claim 18, characterized in that, The heat dissipation substrate is configured to be connected to the light source module, and the heat dissipation substrate is located between the projection lens and the baffle.

20. The projection device as claimed in claim 18, characterized in that, The heat dissipation substrate is close to the first cover plate, and the airflow generator is close to the second cover plate. Ambient air from outside the housing flows into the housing through the air inlet and enters the air inlet surface of the airflow generator through the opening of the baffle. Then, it enters the plurality of airflow channels of the heat dissipation component through the airflow generator and flows out of the housing through the air outlet.

21. The projection device as claimed in claim 18, characterized in that, The first cover plate is provided with a light outlet, and the image beam is projected from the light outlet of the first cover plate to the outside of the projection device.

22. The projection device as claimed in claim 18, characterized in that, The air inlet includes a plurality of first openings surrounding the first cover plate, and the air outlet includes a plurality of second openings surrounding the second cover plate, the plurality of second openings corresponding to the plurality of airflow channels.

23. The projection device as claimed in claim 18, characterized in that, The heat sink is disposed adjacent to the second cover plate, and the plurality of first fins are located between the baffle and the second cover plate.

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