Heat dissipation device and projection module

Abstract

Embodiments of the present application provide a heat dissipation device and a projection module. The heat dissipation device is used to cool down a light engine of the projection module. The heat dissipation device includes a housing, a heat dissipation member, a shielding member, and a fixing member. The housing has a receiving space for receiving the light engine. The heat dissipation member has a first part in thermal contact with the housing and a second part spaced apart from the housing by a gap, the gap being communicated with the receiving space, and heat generated by the light engine is conducted through the first part of the heat dissipation member and the housing. The shielding member covers the housing, the second part, and the gap. The fixing member sequentially passes through the shielding member and the second part of the heat dissipation member, and is then fixed to the housing to fix the shielding member and the heat dissipation member to one side of the housing.

Description

Technical Field

[0001] This invention relates to a heat dissipation device and a projection module, and more particularly to a heat dissipation device and a projection module for cooling the optical engine of a projection module. Background Technology

[0002] Generally, during operation, an optical engine throws a waste beam onto its housing to darken the projected light. However, this relatively increased internal temperature causes thermal expansion, potentially leading to displacement of optical components. Furthermore, traditional heat dissipation devices, consisting of heat shields mounted on the optical engine housing, absorb the waste heat from the discarded beam. These devices are installed externally to the housing or clamped into openings within it, and are thermally insulated from the housing to prevent heat transfer back into the housing. However, because the heat dissipation device is not in direct thermal contact with the housing, its cooling efficiency cannot be effectively improved. Summary of the Invention

[0003] Therefore, the purpose of this invention is to provide a heat dissipation device and a projection module to improve the heat dissipation efficiency of the projection module.

[0004] An embodiment of the present invention provides a heat dissipation device, the heat dissipation device comprising:

[0005] The housing has an accommodating space for accommodating the optical engine;

[0006] The heat sink has a first portion that is in thermal contact with the housing and a second portion that is spaced apart from the housing by a gap, the gap being in communication with the accommodating space, and the heat generated by the optomechanical device is conducted through the first portion of the heat sink and the housing;

[0007] The shielding element covers the housing, the second portion, and the gap; and

[0008] The fastener passes sequentially through the second part of the shielding member and the heat dissipation member, and is then fixed to the housing to secure the shielding member and the heat dissipation member to one side of the housing.

[0009] Preferably, the shielding element is sheet-shaped.

[0010] Preferably, the shielding element is a rubber sheet or a polyester film.

[0011] Preferably, the fastener is a locking device, a riveting device, or a snap-fit ​​device.

[0012] Preferably, the first part of the heat sink corresponds to the opening of the shielding member, the second part includes a perforation, and the fixing member passes through the perforation and is fixed to the housing.

[0013] More preferably, the second portion of the heat sink is arranged around the first portion, the housing has a sidewall portion, and the second portion is loosely fitted with the sidewall portion and separated by the gap.

[0014] More preferably, the second part does not overlap with the sidewall portion in the vertical projection direction of the second part.

[0015] More preferably, the shielding member is attached to the same side of the second part and the side wall portion.

[0016] Preferably, the first portion shields the discarded beam projected by the optical engine to absorb the heat generated by the discarded beam.

[0017] An embodiment of the present invention further provides a projection module, comprising:

[0018] Optical engine, used to generate light beams;

[0019] A light valve, located downstream of the optical path of the optical engine, is used to convert the light beam into an image beam and a discard beam; and

[0020] The aforementioned heat dissipation device houses the optical engine within the housing of the heat dissipation device.

[0021] Compared with the prior art, the embodiments of the present invention provide a heat dissipation device and a projection module, wherein the heat dissipation device is used to cool the optical engine of the projection module. The heat dissipation device includes: a housing, a heat sink, a shielding member, and a fixing member. The housing has an accommodating space for accommodating the optical engine. The heat sink has a first portion that is in thermal contact with the housing and a second portion that is spaced apart from the housing by a gap, the gap communicating with the accommodating space, and the heat generated by the optical engine is conducted through the first portion of the heat sink and the housing. The shielding member covers the housing, the second portion, and the gap. The fixing member sequentially passes through the shielding member and the second portion of the heat sink, thereby fixing it to the housing, for securing the shielding member and the heat sink to one side of the housing. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a projection module according to an embodiment of the present invention.

[0023] Figure 2 for Figure 1 An exploded view of the heat dissipation device.

[0024] Figure 3 for Figure 1 A schematic diagram of the AA cross-section of the projection module.

[0025] Figure 4 for Figure 3 The enlarged view corresponding to part B in the image. Detailed Implementation

[0026] To provide a further understanding of the purpose, structure, features, and functions of the present invention, detailed descriptions are provided below with reference to specific embodiments.

[0027] Certain terms are used in the specification and claims to refer to specific elements. It will be understood by those skilled in the art that manufacturers may use different names to refer to the same element. This specification and claims do not distinguish elements by differences in name, but rather by differences in function. The term "comprising" throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to".

[0028] The ordinal numbers used in the instruction manual, such as "first," "second," and "third," are used to modify components. They do not imply or represent any previous ordinal number of the component, nor do they represent the order of one component with another component, or the order of manufacturing methods. The use of these ordinal numbers is only to make it clear that a component with a certain name can be distinguished from another component with the same name.

[0029] Please refer to Figures 1 to 4 , Figure 1 A schematic diagram of a projection module 100 according to an embodiment of the present invention is shown. Figure 2 Draw Figure 1 An exploded view of the heat dissipation device 108 in the diagram. Figure 3 Draw Figure 1 A schematic diagram of the AA section of the projection module 100. Figure 4 Draw Figure 3 The enlarged view corresponding to part B in the image.

[0030] The projection module 100 may include an optical engine 101, an optical valve 102, and a heat dissipation device 108. The optical engine 101 is adapted to generate a light beam. The optical valve 102 is located downstream of the optical path of the optical engine 101 and can convert the light beam into a first beam (i.e., an image beam) and a second beam (i.e., a discard beam). In other words, the light beam generated by the optical engine 101 forms the image beam when the reflector is open by the optical valve 102, and forms the discard beam when the reflector is closed by the optical valve 102. That is, the discard beam is an unavoidable byproduct of the scheme of modulating the light beam using the optical valve 102. A prism assembly (not shown) is located downstream of the optical path of the optical valve 102 and can receive the image beam and the discard beam. The heat dissipation device 108 is located downstream of the optical path of the prism assembly to block the discard beam from the prism assembly. In this way, the heat dissipation device 108, which is exposed to the discarded beam, can conduct heat through its heat sink 120 to effectively reduce the temperature inside the optical engine 101, thereby reducing or preventing thermal drift in the projection module 100. In addition, the heat dissipation device 108 not only reduces the temperature inside the optical engine 101, but the shielding member 130 covering the heat sink 120 also has a dustproof function.

[0031] Reference Figure 2 The heat dissipation device 108 is used to cool the optical engine 101. The heat dissipation device 108 includes a housing 110, a heat sink 120, a shielding member 130, and a fixing member 140. The number of fixing members 140 may include, but is not limited to, four. The fixing members 140 are used to fix the shielding member 130 and the heat sink 120 to one side of the housing 110, such as... Figure 1 As shown. In one embodiment, the fastener 140 is, for example, a locking device such as a screw; however, the fastener 140 may also be a riveting or snap-fit ​​device such as a rivet or a tenon, and the invention is not limited thereto.

[0032] The housing 110 has an internal accommodating space 111 for accommodating the optical engine 101. The optical engine 101 can also be referred to as an optical engine. Furthermore, the light valve 102 is a spatial light modulator, such as a digital micro-mirror device (DMD). However, in other embodiments, the light valve 102 can also be a liquid-crystal-on-silicon panel (LCOS panel), a transmissive liquid crystal panel, or other suitable light valve 102 module; this invention is not limited thereto.

[0033] The heat sink 120 has a first portion 122 that is in thermal contact with the housing 110 and a second portion 124 that is spaced apart from the housing 110 by a gap G. The heat sink 120 performs the main heat dissipation function, while the housing 110 helps the heat sink 120 disperse some of the heat and reduces or prevents the heat from being transferred back to the optomechanical 101 in its accommodating space 111. The first portion 122 may be located at the center of the heat sink 120, and the second portion 124 may be located at the periphery of the heat sink 120. However, the invention is not limited thereto; in another embodiment, the first portion 122 may be located at the edge of the heat sink 120, not necessarily at the center. The first portion 122 is used to absorb the heat generated by the discarded beam projected by the optomechanical 101.

[0034] Reference Figure 2 The second portion 124 of the heat sink 120 is arranged around the first portion 122. The housing 110 has a side wall portion 114, and the second portion 124 is loosely fitted with the side wall portion 114 and separated by a gap G (see reference). Figure 4 The sidewall portion 114 is located, for example, on the surrounding structure of the receiving space 111 surrounding the housing 110.

[0035] Reference Figure 2 The shielding member 130, for example, has an opening 132 for displaying a portion of the heat sink 120. The shape of the opening 132 may include, but is not limited to, a quadrilateral. Figure 2 As shown, the first portion 122 of the heat sink 120 corresponds to the opening 132 of the shielding member 130, so that the first portion 122 of the heat sink 120 is exposed in the opening 132 of the shielding member 130. The first portion 122 of the heat sink 120 can be used to shield the discarded beam and absorb the heat generated from the discarded beam. The heat sink 120 conducts heat to the outside air, for example, by thermal radiation or thermal convection, to achieve the effect of cooling the optical engine 101.

[0036] like Figure 2 As shown, the structure around the accommodating space 111 of the housing 110 is provided with a plurality of screw holes 112. The number of screw holes 112 is unlimited. The position of the screw holes 112 is opposite to the position of the fasteners 140, so that each fastener 140 can pass through the opening 131 of the shielding member 130 and the through hole 121 of the heat dissipation member 120, and then be locked in the corresponding screw hole 112 and fixed on the housing 110.

[0037] In addition, refer to Figure 2The housing 110, located around the accommodating space 111, is also provided with a plurality of positioning posts 113, the number of which is unlimited. The surrounding portion of the heat sink 120 is provided with a plurality of positioning holes 123, the number of which is unlimited. The positions of the positioning holes 123 are opposite to the positions of the positioning posts 113, so that each positioning post 113 can pass through the corresponding positioning hole 123 to keep the position of the heat sink 120 and the housing 110 fixed.

[0038] The portion of the heat sink 120 that contacts the screw hole 112 of the housing 110 can also be regarded as part of the thermal contact with the housing 110, so that the heat absorbed by the heat sink 120 can be conducted to the housing 110 through the surrounding portion, and then the housing 110 conducts the heat to the outside air by means of thermal radiation or thermal convection, so as to further achieve the effect of cooling the optical engine 101.

[0039] Additionally, refer to Figure 2 The sidewall portion 114 of the housing 110 is adjacent to the periphery of the screw hole 112, and the periphery of the through portion 121 of the heat sink 120 may be a second portion 124. The edge surface 124a of this second portion 124 is disposed opposite to the inner surface of the sidewall portion 114 and separated by a gap G (see Figure 4 This edge surface 124a is not in direct contact with the housing 110; therefore, the edge surface 124a of the second part 124 is separated from the housing 110 by a gap G.

[0040] Viewed from a top-down perspective, the second portion 124 of the heat sink 120 and the sidewall portion 114 do not overlap in the vertical projection direction of the second portion 124. The shielding member 130 can be attached to the same side of the second portion 124 and the sidewall portion 114 by adhesive, and the shielding member 130 extends horizontally along the side of the housing 110 in a sheet-like shape. In other words, the outer surface of the second portion 124 is flush with the outer surface of the sidewall portion 114, so that the shielding member 130 can be flatly attached to the second portion 124 and the sidewall portion 114.

[0041] In one embodiment, the gap G communicates with the accommodating space 111. (Refer to...) Figure 2 and Figure 4 The shielding member 130 covers the housing 110, the second part 124, and the gap G. The fixing member 140 can sequentially pass through the opening 131 of the shielding member 130 and the through-hole 121 of the second part 124 of the heat dissipation member 120, and then be locked onto the housing 110 by the screw hole 112, so as to prevent dust from entering the accommodating space 111 through the gap G.

[0042] The shielding member 130 is, for example, a sheet. The shielding member 130 is, for example, a rubber sheet or a polyester film (e.g., a PET film). In addition to preventing dust, the shielding member 130 also has a light-blocking effect, preventing light leakage from the edges of the housing 110. The projection module 100 of the present invention, through the aforementioned heat dissipation device 108, avoids the problem of poor heat dissipation efficiency caused by traditional heat dissipation devices that use heat insulation sheets mounted on the optical engine housing. In contrast, the heat dissipation member 120 of this embodiment is in thermal contact with the housing 110, thus effectively improving heat dissipation efficiency.

[0043] In summary, the embodiments of the present invention provide a heat dissipation device and a projection module, wherein the heat dissipation device is used to cool the optical engine of the projection module. The heat dissipation device includes: a housing, a heat sink, a shielding member, and a fixing member. The housing has an accommodating space for accommodating the optical engine. The heat sink has a first portion that is in thermal contact with the housing and a second portion that is spaced apart from the housing by a gap, the gap communicating with the accommodating space. Heat generated by the optical engine is conducted through the first portion of the heat sink and the housing. The shielding member covers the housing, the second portion, and the gap. The fixing member sequentially passes through the shielding member and the second portion of the heat sink, thereby fixing it to the housing, thereby securing the shielding member and the heat sink to one side of the housing.

[0044] The present invention has been described in the above-described embodiments; however, these embodiments are merely examples for implementing the present invention. It must be noted that the disclosed embodiments do not limit the scope of the present invention. Conversely, any modifications and refinements made without departing from the spirit and scope of the present invention are within the scope of patent protection of the present invention.

Claims

1. A heat dissipation device for cooling the optical engine of a projection module, characterized in that, The heat dissipation device includes: The housing has an accommodating space for accommodating the optical engine; The heat sink has a first portion that is in thermal contact with the housing and a second portion that is spaced apart from the housing by a gap, the gap being in communication with the accommodating space, and the heat generated by the optomechanical device is conducted through the first portion of the heat sink and the housing; The shielding element covers the housing, the second portion, and the gap; and The fastener passes sequentially through the second part of the shielding member and the heat dissipation member, and is then fixed to the housing to secure the shielding member and the heat dissipation member to one side of the housing.

2. The heat dissipation device as described in claim 1, characterized in that, The shielding element is sheet-shaped.

3. The heat dissipation device as described in claim 1, characterized in that, The shielding element is a rubber sheet or a polyester film.

4. The heat dissipation device as described in claim 1, characterized in that, The fastener is a locking device, a riveting device, or a snap-fit ​​device.

5. The heat dissipation device as described in claim 1, characterized in that, The first part of the heat sink corresponds to the opening of the shielding member, the second part includes a perforation, and the fastener passes through the perforation and is fixed to the housing.

6. The heat dissipation device as described in claim 5, characterized in that, The second part of the heat sink is arranged around the first part, the housing has a side wall portion, and the second part is loosely fitted with the side wall portion and separated by the gap.

7. The heat dissipation device as described in claim 6, characterized in that, The second part does not overlap with the sidewall part in the vertical projection direction of the second part.

8. The heat dissipation device as described in claim 6, characterized in that, The shielding element is attached to the same side of the second part and the side wall.

9. The heat dissipation device as described in claim 1, characterized in that, The first part shields the discarded beam projected by the optical engine in order to absorb the heat generated by the discarded beam.

10. A projection module, characterized in that, include: Optical engine, used to generate light beams; An optical valve, located downstream of the optical path of the optical engine, is used to convert the beam into an image beam and a discard beam; as well as As in any one of claims 1 to 9, the optical engine is housed in the housing space of the heat dissipation device.

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