Projection light machine and projection equipment

Abstract

The utility model relates to a projection light machine and projection equipment. The projection light machine comprises a shell, an optical assembly, a heat dissipation structure and a first fan. The optical assembly comprises a light path propagation assembly and a lens module, the light path propagation assembly comprises a reflector located in the containing cavity, the reflector is provided with a first end and a second end which are opposite to each other, and the distance between the reflector and the lens module in the first direction is gradually increased from the first end to the second end; the heat dissipation structure comprises a first heat dissipation piece, the first heat dissipation piece comprises a heat absorption part and a heat dissipation part, the heat absorption part is arranged in the containing cavity and located on the side, away from the lens module, of the reflector, and the heat dissipation part is located outside the containing cavity and arranged on the side, away from the lens module, of the shell; the heat absorption part comprises a plurality of first fins arranged at intervals in the second direction. The first fin comprises a first sub-fin close to the first end and a second sub-fin close to the second end, and the projection area of the first fin in the second direction has a gradually decreasing change trend from the first sub-fin to the second sub-fin.

Description

Technical Field

[0001] This application relates to the field of projection equipment technology, and in particular to a projection optical engine and projection equipment. Background Technology

[0002] A projector is an electronic device that converts image or video signals into visual images and projects them through a lens system. It is now widely used in presentations and home theaters. Different projectors use different imaging technologies, among which the most common are single-panel LCD projectors that use liquid crystal display technology for imaging.

[0003] A projector mainly consists of an optical engine, an imaging system, and a control system. The optical engine is the core of the entire projector, including the light source, LCD screen, and optical path components. Early optical engines used an open design, which inevitably allowed dust from the air to enter the optical path during heat dissipation, resulting in poor projection quality and a shortened projector lifespan. In contrast, a fully sealed optical engine features a closed and independent optical path structure, significantly enhancing dust resistance.

[0004] To address the heat dissipation issue of the LCD screen after the optical engine is sealed, current fully sealed optical engines typically employ an internal turbine fan for internal cooling, along with heat exchangers and other heat dissipation structures. However, the heat dissipation effect of current fully sealed optical engines is limited, significantly restricting the brightness and power of the engine. Utility Model Content

[0005] Therefore, it is necessary to provide a projection optical engine and projection device that can improve the heat dissipation and cooling effect of the optical engine, thereby significantly increasing the power and brightness of the projection optical engine.

[0006] An embodiment of the first aspect of this application provides a projection optical engine, including a housing, optical components, a heat dissipation structure, and a first fan. The housing has a receiving cavity. The optical components include a light path propagation assembly and a lens module. The light path propagation assembly includes a mirror located within the receiving cavity. The lens module is disposed through a side wall of the housing. The mirror has a first end and a second end facing each other. The first end faces the lens module, and the distance between the mirror and the lens module gradually increases from the first end to the second end in a first direction. The heat dissipation structure includes a first heat sink, which includes a heat absorption part and a heat dissipation part. The heat absorption part is disposed... The heat dissipation part is located outside the housing and on the side of the housing away from the lens module, within the housing cavity and on the side of the housing away from the lens module. The heat absorption part includes a plurality of first fins spaced apart along a second direction, the second direction being perpendicular to and coplanar with the first direction. The first fins include a first sub-fin near the first end and a second sub-fin near the second end. From the first sub-fin to the second sub-fin, the projected area of ​​the first fin in the second direction has a gradually decreasing trend. A first fan is disposed within the housing cavity. The first fan has a first air inlet end facing the heat absorption part.

[0007] In one embodiment, the first heat sink further includes a base plate, and the heat absorption part and the heat dissipation part are connected through the base plate; the heat dissipation part includes a plurality of second fins spaced apart along a third direction on the surface of the base plate, the first fins and the second fins are respectively located on both sides of the base plate in a first direction, and the first direction, the second direction and the third direction are arranged perpendicular to each other.

[0008] In one embodiment, the second fin includes a body portion and an extension portion, wherein the orthographic projection of the body portion on the plane of the base plate at least partially overlaps with the orthographic projection of the heat-absorbing portion on the plane of the base plate, and the orthographic projection of the extension portion on the plane of the base plate is located outside the orthographic projection of the heat-absorbing portion on the plane of the base plate.

[0009] In one embodiment, the first heat sink further includes a first heat conductor, which includes a first heat conductor, a second heat conductor, and a third heat conductor connected in sequence. The first heat conductor passes through the body portion of the plurality of second fins along the arrangement direction of the second fins, and the third heat conductor passes through the extended portion of the plurality of second fins along the arrangement direction of the second fins. The second heat conductor connects the first heat conductor and the third heat conductor.

[0010] In one embodiment, the base plate is connected to the first fin and / or the second fin by welding or integral extrusion molding.

[0011] In one embodiment, the optical component further includes a light source, and the heat dissipation structure further includes a second heat sink for dissipating heat from the light source. The second heat sink includes a plurality of third fins spaced apart along a first direction or a third direction, with the first direction, the second direction, and the third direction being perpendicular to each other.

[0012] In one embodiment, the second heat sink further includes a second heat conductor and a third heat conductor. The third heat conductor is connected to the light source. The second heat conductor includes a fourth heat conductor, a fifth heat conductor, and a sixth heat conductor connected in sequence. The fourth heat conductor is connected to the surface of the third heat conductor facing away from the light source. The sixth heat conductor is disposed in a plurality of third fins along the arrangement direction of the third fins. The fifth heat conductor is connected to the fourth heat conductor and the sixth heat conductor.

[0013] In one embodiment, the optical path propagation assembly further includes a focusing rod located outside the receiving cavity. The focusing rod is positioned between the light source and the reflector in the second direction. Along the direction away from the light source, the cross-sectional area of ​​the focusing rod in the second direction has a gradually increasing trend. A plurality of third fins are arranged at intervals along the third direction and are all located on one side of the focusing rod in the first direction. The third fins have a third end and a fourth end located on both sides in the second direction. The third end faces the light source. From the third end to the fourth end, the cross-sectional area of ​​the third fins in the second direction has a gradually decreasing trend.

[0014] In one embodiment, the projection optical engine further includes a second fan having a second air inlet and a second air outlet arranged along a second direction, the second air inlet facing the second heat sink and the second air outlet facing away from the second heat sink; or, the second air inlet facing away from the second heat sink and the second air outlet facing the second heat sink.

[0015] An embodiment of the second aspect of this application provides a projection device, including a projection optical engine as described in any of the first aspect embodiments above.

[0016] The projection optical engine provided in this application uses a first fan to circulate and agitate the air inside the housing, causing the heat carried in the air to be absorbed by the heat-absorbing part, thereby cooling the air inside the housing. Positioning the heat-absorbing part and the first fan on the side of the reflector away from the lens module increases the volume of the heat-absorbing part, improves the heat dissipation efficiency of the projection optical engine, and allows airflow to pass through the space near the lens module on the side of the reflector. Simultaneously, the first air inlet of the first fan faces the heat-absorbing part, allowing as much of the circulating air inside the housing as possible to pass through the heat-absorbing part, further improving the heat dissipation effect and efficiency of the projection optical engine. Furthermore, by including multiple spaced-apart first fins in the heat-absorbing part, the air inside the housing flows through the gaps between adjacent first fins and exchanges heat with the fins, increasing the contact area between the heat-absorbing part and the air, and improving the heat absorption effect of the heat-absorbing part. On the other hand, the reflector is tilted relative to the lens module inside the housing, and from the first end to the second end of the reflector, the reflector gradually moves away from the lens module in the second direction. Similarly, from the first end to the second end of the reflector, multiple first fins are arranged at intervals, and the projected area of ​​the first fins in the second direction gradually decreases, matching the tilted reflector. This fully utilizes the space on the side of the reflector away from the lens module, significantly increasing the contact area between the first fins and the air inside the housing, further improving the heat dissipation effect and efficiency of the projection optical engine. Furthermore, the shape of the first fins is adapted to the reflector design, which can reduce the height of the projection optical engine, making the overall shape of the projection optical engine flatter. Therefore, this application can significantly improve the heat dissipation effect and efficiency of the projection optical engine, thereby allowing for a substantial increase in the power and brightness of the projection optical engine by increasing its power. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a projection optical engine according to some embodiments of this application.

[0019] Figure 2 An example is shown. Figure 1 A cross-sectional view of the projection optical engine from the AA perspective.

[0020] Figure 3 An example is shown. Figure 2 A schematic diagram of the structure of the first heat sink component.

[0021] Figure 4A schematic diagram of the structure of the first heat sink is shown as another example.

[0022] Figure 5 A schematic diagram of another example of a projection optical engine is shown.

[0023] Figure 6 An example is shown. Figure 5 A schematic diagram of the structure of the first heat sink component.

[0024] Figure 7 A schematic diagram of another example of a projection optical engine is shown.

[0025] Figure 8 An example is shown. Figure 7 A schematic diagram of the structure of the second heat sink.

[0026] Figure label:

[0027] 10. Projection optical engine;

[0028] 100. Shell; 110. Receiving cavity;

[0029] 200. Optical components; 210. Lens module; 220. Mirror; 221. First end; 222. Second end; 230. Front Fresnel lens; 240. Heat-insulating glass; 250. LCD screen; 260. Rear Fresnel lens; 270. Focusing rod; 280. Light source;

[0030] 300. Heat dissipation structure; 310. First heat dissipation component; 311. Heat absorption section; 3111. First fin; 3112. First sub-fin; 3113. Second sub-fin; 312. Heat dissipation section; 3121. Second fin; 3122. Body section; 3123. Extension section; 313. Base plate; 314. First heat conduction component; 3141. First heat conduction section; 3142. Second heat conduction section; 3143. Third heat conduction section; 320. Second heat dissipation component; 321. Third fin; 3211. Third end; 3212. Fourth end; 322. Second heat conduction component; 3221. Fourth heat conduction section; 3222. Fifth heat conduction section; 3223. Sixth heat conduction section; 323. Third heat conduction component;

[0031] 400. First fan;

[0032] 500. Second fan;

[0033] 600, power supply board;

[0034] x, first direction; y, second direction; z, third direction; S1, internal circulation air duct; S2, system circulation air duct. Detailed Implementation

[0035] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0036] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0037] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0041] Currently, most projector products on the market use relatively small heat sinks for cooling the optical engine, limiting its ability to circulate heat. This prevents the internal heat from dissipating quickly, resulting in the optical components operating at high temperatures and significantly restricting the engine's maximum power and brightness. Furthermore, in current projector optical engines, the space between the lens and the LCD screen is not part of a circulating cooling airflow. If the internal seal is not tight or moisture is present, fogging can easily occur on the lens or reflector surface when the projector is turned on in a humid environment, leading to a blurry projected image.

[0042] Based on this, embodiments of this application provide a projection optical engine and projection device that can improve the heat dissipation and cooling effect of the optical engine, thereby significantly increasing the power and brightness of the projection optical engine.

[0043] The projection optical engine and projection device provided in the embodiments of this application will be described below with reference to the accompanying drawings. It should be noted that in the drawings, the x-direction is the first direction, the y-direction is the second direction, and the z-direction is the third direction. In the drawings, for ease of drawing, the dimensions are not necessarily proportional to the actual dimensions.

[0044] Please refer to Figures 1 to 3 , Figure 1 This is a schematic diagram of the structure of a projection optical engine according to some embodiments of this application. Figure 2 An example is shown. Figure 1 A cross-sectional view of the projection optical engine from the AA perspective. Figure 3 An example is shown. Figure 2The diagram shows the structure of the first heat sink. The small arrows in the diagram represent the direction of airflow.

[0045] like Figures 1 to 3 As shown, this application provides a projection optical engine 10, including a housing 100, an optical assembly 200, a heat dissipation structure 300, and a first fan 400. The housing 100 has a receiving cavity 110. The optical assembly 200 includes a light path propagation component and a lens module 210. The light path propagation component includes a reflector 220 located within the receiving cavity 110, and the lens module 210 passes through the side wall of the housing 100. The reflector 220 has a first end 221 and a second end 222 facing each other, with the first end 221 facing the lens module 210. From the first end 221 to the second end 222, the distance between the reflector 220 and the lens module 210 gradually increases in a first direction (x direction in the figure). The heat dissipation structure 300 includes a first heat dissipation component 310, which includes a heat absorption portion 311 and a heat dissipation portion 312. The heat absorption portion 311 is disposed within the receiving cavity 110 and is located on the side of the reflector 220 opposite to the lens module 210. The heat dissipation portion 312 is located outside the receiving cavity 110 and is disposed on the side of the housing 100 opposite to the lens module 210. The heat absorption portion 311 includes a plurality of first fins 3111 spaced apart along a second direction (y-direction in the figure), where the second direction y is perpendicular to and coplanar with the first direction x. The first fins 3111 include a first sub-fin 3112 near the first end 221 and a second sub-fin 3113 near the second end 222. From the first sub-fin 3112 to the second sub-fin 3113, the projected area of ​​the first fins 3111 in the second direction y gradually decreases. The first fan 400 is disposed in the receiving cavity 110. The first fan 400 has a first air inlet end, which faces the heat absorption part 311.

[0046] As can be seen from the above-described structure of the projection optical engine 10, light can be adjusted by the optical path propagation component and finally projected onto the image through the lens module 210. The projection optical engine generates heat during operation, causing the temperature inside the housing 100 to rise. The housing 100 has a receiving cavity 110, within which the reflector 220 of the optical path propagation component is located. High temperatures inside the housing 100 may damage the optical path propagation component, affecting the brightness and power output of the projection optical engine 10. The receiving cavity 110 of the housing 100 also houses a first fan 400 and a heat-absorbing part 311 of the first heat sink 310. Specifically, under the agitation of the first fan 400, the air inside the housing 100 can circulate. When the air flows through the heat-absorbing part 311, the heat carried in the air can be absorbed by the heat-absorbing part 311, achieving cooling of the air inside the housing 100. This reduces the temperature of the optical path propagation component inside the housing 100, providing a suitable operating environment for the optical path propagation component within the housing 100. Since the space on the side of the reflector 220 away from the lens module 210 is relatively large, the heat absorption part 311 is set on the side of the reflector 220 away from the lens module 210. By increasing the volume of the heat absorption part 311, the contact area between the heat absorption part 311 and the air inside the housing 100 can be increased, thereby improving the heat dissipation efficiency of the projection optical engine 10.

[0047] When the first fan 400 agitates the air inside the housing 100, the airflow can flow through the space near the lens module 210 on the side of the reflector 220. When the projection engine 10 is not sealed properly or contains moisture, and is turned on in a humid environment, the water mist on the surface of the lens module 210 and the reflector 220 can be carried away by the circulating airflow in time. This solves the problem of fogging on the surface of the lens module 210 and the reflector 220, which leads to unclear projection images. This further improves the heat dissipation efficiency of the projection engine 10 while improving the projection quality.

[0048] Furthermore, the first fan 400 is located on the same side of the reflector 220 and the heat absorption part 311 in the third direction (z direction in the figure), with the first direction x, the second direction y, and the third direction z intersecting in pairs. In this embodiment, the first fan 400 does not encroach on the space on the side of the reflector 220 away from the lens module 210, and this space can be entirely used to arrange the heat absorption part 311, thereby increasing the area of ​​the heat absorption part 311 and improving the heat dissipation effect of the first heat sink 310. Secondly, the arrangement of the first fan 400 on the side of the reflector 220 in the third direction z can also reduce the size of the projection optical engine 10 in the first direction x and the second direction y, making the overall shape of the projection optical engine 10 more flat. The first air inlet of the first fan 400 faces the heat absorption section 311, allowing as much of the circulating air inside the housing 100 as possible to pass through the heat absorption section 311. The heat absorption section 311 can then fully contact the air inside the housing 100 to absorb the heat carried by the air. After the heat in the air is absorbed by the heat absorption section 311, the cool air can continue to circulate within the housing 100 due to the disturbance caused by the first fan 400, further improving the heat dissipation effect and efficiency of the projection optical engine 10. Furthermore, by including multiple spaced-apart first fins 3111 in the heat absorption section 3111, the air inside the housing 100 flows through the gaps between adjacent first fins 3111 and exchanges heat with them, increasing the contact area between the heat absorption section 311 and the air, and improving the heat absorption effect of the heat absorption section 311.

[0049] On the other hand, the reflector 220 is tilted relative to the lens module 210 inside the housing 100, and from the first end 221 to the second end 222 of the reflector 220, the reflector 220 gradually moves away from the lens module 210 in the second direction y. Similarly, from the first end 221 to the second end 222 of the reflector 220, a plurality of first fins 3111 are arranged at intervals, and the projected area of ​​the plurality of first fins 3111 in the second direction y has a gradually decreasing trend, which matches the tilted reflector 220, making full use of the space on the side of the reflector 220 away from the lens module 210, greatly increasing the contact area between the first fins 3111 and the air inside the housing 100, and further improving the heat dissipation effect and heat dissipation efficiency of the projection optical engine 10. Moreover, the shape of the first fins 3111 is adapted to the design of the reflector, which can reduce the height of the projection optical engine 10, making the overall shape of the projection optical engine 10 flatter. Therefore, this application can significantly improve the heat dissipation and cooling effect and heat dissipation efficiency of the projection optical engine 10, thereby greatly increasing the power and brightness of the projection optical engine 10 by increasing the power.

[0050] Furthermore, the heat-absorbing part 311 is provided with a plurality of first fins 3111 on the side of the first sub-fin 3112 facing away from the second sub-fin 3113, and the projected area of ​​the first fins 3111 on the side of the first sub-fin 3112 facing away from the second sub-fin 3113 in the second direction y is equal to that of the first sub-fin 3112. Of course, this is only an example and is not a specific limitation. In other embodiments, in order to adapt to the inner contour of the housing 100, the projected area of ​​the first fins 3111 on the side of the first sub-fin 3112 facing away from the second sub-fin 3113 in the second direction y can also gradually decrease or gradually increase, etc.

[0051] As one possible implementation, the optical path propagation component includes multiple optical path propagation structures arranged along the second direction y, with some of the optical path propagation structures located within the receiving cavity 110.

[0052] Specifically, the optical path propagation components may include a front Fresnel lens 230, a heat-insulating glass 240, a liquid crystal screen 250, a rear Fresnel lens 260, and a reflector 220 arranged within the housing cavity 110 along the second direction x. These optical path propagation structures form an internal circulation air duct S1 with the housing 100. The first fan 400 also includes a first air outlet. Air flowing through the heat absorption section 311 enters the first air inlet of the first fan 400 and is discharged from the first air outlet. It passes through the cavities between the front Fresnel lens 230 and the heat-insulating glass 240, between the heat-insulating glass 240 and the liquid crystal screen 250, and between the liquid crystal screen 250 and the rear Fresnel lens 260. Then it enters the cavity between the rear Fresnel lens 260 and the reflector 220, carrying away the heat inside the housing 100. After that, it enters the heat absorption section 311 for cooling. The cooled air then enters the first air inlet of the first fan 400, realizing air circulation.

[0053] The primary function of the front Fresnel lens 230 is to collimate and shape the incident light. A polarizing film is attached to the heat-insulating glass 240, allowing polarized light suitable for liquid crystal control to pass through for imaging, while reflecting unusable light. The liquid crystal screen 250 can be considered a light valve device, controlling the amount of different colors of light passing through according to input signals to achieve the desired image. The primary function of the rear Fresnel lens 260 is to converge the light emitted from the liquid crystal screen 250. The reflector 220 reflects the light emitted from the rear Fresnel lens 260 back to the lens module 210.

[0054] As one possible implementation, the first heat sink 310 also includes a base plate 313, through which the heat absorption part 311 and the heat dissipation part 312 are connected. The heat dissipation part 312 includes a plurality of second fins 3121 spaced apart on the surface of the base plate 313 along a third direction (z direction in the figure). The first fins 3111 and the second fins 3121 are respectively located on both sides of the base plate 313 in the first direction x, and the first direction x, the second direction y and the third direction z are arranged to intersect each other.

[0055] Based on this, the heat absorbed by the heat-absorbing part 311 located in the housing cavity 110 can be transferred through the bottom plate 313 to the heat dissipation part 312 located outside the housing 100, and carried away by the cold air outside the housing 100. This allows the heat-absorbing part 311 to continuously absorb the heat carried by the air inside the housing 100 and continuously dissipate heat inside the housing 100. The air inside the housing 100 can be cooled down in time when it flows through the heat-absorbing part 311, and then enter the first fan 400 for circulation. This further improves the heat dissipation effect and efficiency of the projection optical engine 10, and at the same time makes the arrangement of the heat-absorbing part 311 and the heat dissipation part 312 inside the housing 100 more diverse. Furthermore, since the arrangement direction of the first fin 3111 in the heat absorption section 311 and the arrangement direction of the second fin 3121 in the heat dissipation section 312 are different, the airflow direction through the heat absorption section 311 and the heat dissipation section 312 is also different. Compared with the scheme where the arrangement direction of the first fin 3111 and the second fin 3121 is the same, in this embodiment, since the airflow direction inside and outside the housing 100 is different, the probability of resonance occurring in the heat absorption section 311 and the heat dissipation section 312 when air flows through is reduced, thereby reducing the noise and vibration generated by the projector shutdown 10 during operation.

[0056] As one possible implementation, such as Figure 3 As shown, both the first fin 3111 and the second fin 3121 are directly connected to the base plate 313. Based on this, the heat absorbed by the heat-absorbing part 311 can be directly transferred through the base plate 313 to the heat dissipation part 312 located outside the housing 100, and carried away by the cold air outside the housing 100. This allows the heat-absorbing part 311 to continuously absorb the heat carried by the air inside the housing 100, continuously dissipating heat inside the housing 100. The air inside the housing 100 can be cooled down in time when flowing through the heat-absorbing part 311, and then enter the first fan 400 for circulation, further improving the heat dissipation effect and efficiency of the projection optical engine.

[0057] For example, the materials of the first fin 3111, the second fin 3121 and the base plate 313 can be at least one or more of metals such as silver, copper, aluminum, tungsten, and platinum, or alloys such as brass; for example, the materials of the first fin 3111, the second fin 3121 and the base plate 313 can be aluminum. This is only an example and is not a specific limitation.

[0058] In some examples, the first fin 3111 can adopt a thin fin structure to further increase the heat exchange area of ​​the heat absorption part 311, thereby further improving the heat dissipation effect and heat dissipation efficiency of the projection optical engine.

[0059] In some examples, the heat exchange area of ​​the heat-absorbing part 311 can be further increased by increasing the number of first fins 3111 and / or reducing the spacing between two adjacent first fins 3111 in their arrangement direction, thereby further improving the heat dissipation effect and heat dissipation efficiency of the projection optical engine.

[0060] In some examples, the second fin 3121 may also adopt a thin fin structure to further increase the heat exchange area of ​​the heat dissipation part 312, thereby further improving the heat dissipation effect and heat dissipation efficiency of the projection optical engine.

[0061] In some examples, the heat exchange area of ​​the heat dissipation part 312 can be further increased by increasing the number of second fins 3121 and / or reducing the spacing between two adjacent second fins 3121 in their arrangement direction, thereby further improving the heat dissipation effect and heat dissipation efficiency of the projection optical engine.

[0062] In some examples, the number of first fins 3111 can be greater than the number of second fins 3122, and / or, along the arrangement direction of the first fins 3111, the thickness of the first fins 3111 can be less than the thickness of the second fins 3121 in their arrangement direction, and / or, along the arrangement direction of the first fins 3111, the spacing between two adjacent first fins 3111 can be less than the spacing between two adjacent second fins 3121 in their arrangement direction, further increasing the heat exchange area of ​​the heat-absorbing part 311, thereby further improving the heat dissipation effect and heat dissipation efficiency of the projection optical engine.

[0063] In some examples, the orthographic projection of the heat-absorbing part 311 on the base plate 313 overlaps with the orthographic projection of the heat-dissipating part 312 on the base plate 313, that is, the coverage area of ​​the heat-absorbing part 311 in the first direction x and the coverage area of ​​the heat-dissipating part 312 in the first direction x are equal.

[0064] In some examples, a heat-conducting plate and thermally conductive adhesive can be provided between the first fin 3111 and the base plate 313 for connection, and / or, a heat-conducting plate and thermally conductive adhesive can also be provided between the second fin 3121 and the base plate 313 for connection. The heat-conducting plate and thermally conductive adhesive are used to improve the thermal conductivity between the base plate 313 and the fins.

[0065] In some examples, both the first fin 3111 and the second fin 3121 are connected to the base plate 313 by welding.

[0066] Please refer to Figure 4 , Figure 4 A schematic diagram of the structure of the first heat sink is shown as another example.

[0067] As one possible implementation, such as Figure 4 As shown, the base plate 313 and the first fin 3111 and / or the second fin 3121 are integrally extruded.

[0068] Specifically, in one embodiment, the first fin 3111 and the base plate 313 are integrally extruded, which reduces manufacturing costs. However, due to manufacturing process limitations, the first fin 3111 cannot be made very thin and dense, so the heat absorption efficiency of the heat-absorbing part 311 is relatively low. After the first fin 3111 and the base plate 313 are extruded, the second fin 3121 is still connected to the surface of the base plate 313 opposite to the first fin 3111 by welding.

[0069] Similarly, the second fin 3121 can also be integrally extruded with the base plate 313, and then the first fin 3111 can be connected to the base plate 313 by welding. Alternatively, the first fin 3111, the second fin 3121 and the base plate 313 can be integrally extruded.

[0070] Please refer to Figure 5 and Figure 6 , Figure 5 A schematic diagram of another example of a projection optical engine is shown. Figure 6 An example is shown. Figure 5 A schematic diagram of the structure of the first heat sink component.

[0071] As one possible implementation, such as Figure 5 and Figure 6 As shown, the second fin 3121 includes a body portion 3122 and an extended portion 3123. The orthographic projection of the body portion 3122 on the plane of the base plate 313 at least partially overlaps with the orthographic projection of the heat-absorbing portion 311 on the plane of the base plate 313. The orthographic projection of the extended portion 3123 on the plane of the base plate 313 is located outside the orthographic projection of the heat-absorbing portion 311 on the plane of the base plate 313. By extending the second fin 3121, the contact area between the second fin 3121 and the air can be further increased, thereby improving the heat exchange efficiency between the second fin 3121 and the air outside the casing 100.

[0072] In some examples, the first heat sink 310 further includes a first heat conductor 314, which includes a first heat conductor 3141, a second heat conductor 3142, and a third heat conductor 3143 connected in sequence. The first heat conductor 3141 passes through the body portion 3122 of the plurality of second fins 3121 along the arrangement direction of the second fins 3121. The third heat conductor 3143 passes through the extended portion 3123 of the plurality of second fins 3121 along the arrangement direction of the second fins 3121. The second heat conductor 3142 connects the first heat conductor 3141 and the third heat conductor 3143.

[0073] For example, the first heat-conducting element 314 can be a heat pipe with a high thermal conductivity, which can efficiently conduct the heat of the main body 3122 to the extended part 3123, further improving the heat dissipation effect and efficiency of the projection optical engine 10. Based on this, the first heat-conducting part 3141, the second heat-conducting part 3142, and the third heat-conducting part 3143 are connected, and the first heat-conducting part 3141 transfers the heat of the main body 3122 to the extended part 3123 through the second heat-conducting part 3142 and the third heat-conducting part 3143, realizing efficient heat conduction of the main body 3122 and the extended part 3123, further improving the heat dissipation effect and efficiency of the projection optical engine 10.

[0074] For example, the body portion 3122 of the same second fin 3121 is directly connected to the extension portion 3123.

[0075] For example, the body portion 3122 and the extension portion 3123 of the same second fin 3121 are spaced apart along the second direction y, and the gap formed between the extension portion 3123 and the body portion 3122 can be used to place the bolts that fix the first heat sink 310 to the housing 100.

[0076] For example, the first heat sink 310 may include a plurality of first heat conductors 314, and the heat absorbed by the main body 3121 may be conducted to the extended part 3123 through the plurality of first heat conductors 314; the number and arrangement of the first heat conductors 314 may be adjusted according to actual production, and this application embodiment does not limit this.

[0077] Please refer to Figures 1 to 8 , Figure 7 A schematic diagram of another example of a projection optical engine is shown. Figure 8 An example is shown. Figure 7 A schematic diagram of the structure of the second heat sink.

[0078] As one possible implementation, such as Figures 1 to 8 As shown, the optical component 200 also includes a light source 280, and the heat dissipation structure 300 also includes a second heat dissipation component 320 for dissipating heat from the light source 280. The second heat dissipation component 320 includes a plurality of third fins 321 arranged at intervals along a first direction x or a third direction z.

[0079] In some examples, the second heat sink 320 further includes a second heat conductor 322 and a third heat conductor 323, with the third heat conductor 323 connected to the light source 280. The second heat conductor 322 includes a fourth heat conductor 3221, a fifth heat conductor 3222, and a sixth heat conductor 3223 connected in sequence. The fourth heat conductor 3221 is connected to the surface of the third heat conductor 323 on the side opposite to the light source 280, the sixth heat conductor 3223 is disposed through multiple third fins 321 along the arrangement direction of the third fins 321, and the fifth heat conductor 3222 connects the fourth heat conductor 3221 and the sixth heat conductor 3223.

[0080] For example, the light source 280 can be an LED (light-emitting diode) light source. This is only an example and is not a specific limitation.

[0081] For example, the third heat-conducting element 323 can be a heat-conducting plate, and the second heat-conducting element 322 can be a heat-conducting pipe. The heat-conducting pipe has a high thermal conductivity, which can efficiently conduct the heat of the third heat-conducting element 323 to the third fin 321, and then transfer it to the air through the third fin 321, so as to realize the heat dissipation of the light source 280 by the second heat dissipation element 320.

[0082] In some examples, the projection engine 10 further includes a second fan 500 having a second air inlet and a second air outlet arranged along a second direction y. The second air inlet faces the second heat sink 320, and the second air outlet faces away from the second heat sink 320; or, the second air inlet faces away from the second heat sink 320, and the second air outlet faces the second heat sink 320.

[0083] Based on this, such as Figure 1 , Figure 5 and Figure 7 As shown, a system circulation duct S2 for external airflow is also formed outside the housing 100 of the projection engine 10. A second fan 500 drives air to flow from one side in the second direction y to the other side. (Refer to the attached diagram.) Figure 1 , Figure 5 and Figure 7 From the perspective shown, the second fan 500 draws air from the right side of the projector 10 into the system circulation duct S2 and blows it out from the left side of the projector 10. As the cold air flows through the system circulation duct S2, it first passes through the heat dissipation unit 312, carrying away heat from the first heat dissipation component 310, then passes through the second heat dissipation component 320, carrying away heat from the second heat dissipation component 320. Finally, the air, having absorbed heat, leaves the system circulation duct S2 from the left side of the projector 10, thus achieving air circulation. Further, as... Figure 1 and Figure 5As shown, the second fan 500 is located between the second heat sink 320 and the heat sink 312, with the second air inlet facing the heat sink 312 and the second air outlet facing the second heat sink 320. At this time, external cold air can enter from the side of the heat sink 312 away from the second heat sink 320, flow through the second fins 3121, and carry away the heat conducted to the second fins 3121, cooling them down. Then, it enters the second air inlet of the second fan 500 and is blown from the second air outlet of the second fan 500 toward the second heat sink 320 to cool the third fins 321, and blows the hot air out of the housing 100. Therefore, when the projection optical engine 10 is working, the external cold air can dissipate heat from the heat dissipation unit 312 and the second heat dissipation component 320, thereby cooling the interior of the housing 100 of the projection optical engine 10 and the light source 280, further improving the heat dissipation effect and cooling efficiency of the projection optical engine 10. This allows the operating temperature of the light source 280 and the optical components 200 inside the projection optical engine 10 to be maintained within a suitable range. Consequently, the brightness of the projection optical engine 10 can be significantly increased by increasing the power, thus improving the projection quality.

[0084] For example, such as Figure 7 As shown, the second air inlet faces the second heat sink 320, and the heat sink 312 is located on the side of the third fin 321 away from the second fan 500. Both the heat sink 312 and the third fin 321 are located at the second air inlet of the second fan 500. After external cold air flows through the second fin 3121 and the third fin 321, it enters the second air inlet of the second fan 500 and is then blown out from the second air outlet of the second fan 500, thereby achieving heat dissipation for the second fin 3121 and the third fin 321.

[0085] In some examples, such as Figure 1 , Figure 5 and Figure 7 As shown, the projection optical engine 10 may also include a power board 600, which is used to supply power to the various components in the projection optical engine 10. The power board 600 is located outside the housing 100 and on the side of the heat dissipation part 312 away from the heat absorption part 311. When air flows through the second fin 3121 and carries away the heat on the second fin 3121, it also flows through the surface of the power board 600 and carries away the heat of the power board 600, thus cooling the power board 600.

[0086] As one possible implementation, the optical path propagation assembly also includes a focusing rod 270 located outside the receiving cavity 110. The focusing rod 270 is positioned between the light source 280 and the reflector 220 in the second direction y. Along the direction away from the light source 280, the cross-sectional area of ​​the focusing rod 270 in the second direction y gradually increases. The main function of the focusing rod 270 is to collimate the light emitted from the light source 280. After passing through the focusing rod 270, the light enters the front Fresnel lens 230. Furthermore, the front Fresnel lens 230 can collimate and shape the light emitted from the focusing rod 270.

[0087] For example, such as Figure 7 and Figure 8 As shown, multiple third fins 321 are arranged at intervals along the third direction z and are all located on one side of the focusing rod 270 in the first direction x. Each third fin 321 has a third end 3211 and a fourth end 3212 located on both sides of the second direction y, with the third end 3211 facing the light source 280. From the third end 3211 to the fourth end 3212, the cross-sectional area of ​​the third fin 321 in the second direction y gradually decreases. This design allows the shape of the third fin 321 to adapt to the shape of the focusing rod 270, increasing the heat dissipation area of ​​the third fin 321 while reducing the height of the second heat sink 320, thereby reducing the overall height of the projection optical engine 10 and making the overall shape of the projection optical engine 10 more flat.

[0088] The second aspect of this application also provides a projection device, including the projection optical engine 10 of any of the first aspect embodiments described above. Since the projection device provided by the second aspect of this application includes the projection optical engine 10 of any of the above embodiments, it possesses the beneficial effects of the projection optical engine 10 of any of the above embodiments, which will not be elaborated further here.

[0089] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0090] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A projection optical engine, characterized in that, include: A housing having a receiving cavity inside; An optical component, comprising an optical path propagation component and a lens module, wherein the optical path propagation component includes a reflector located within the receiving cavity, and the lens module is disposed through the side wall of the housing, the reflector having a first end and a second end opposite to each other, the first end facing the lens module, and the distance between the reflector and the lens module gradually increasing in a first direction from the first end to the second end; A heat dissipation structure includes a first heat dissipation component, which includes a heat-absorbing portion and a heat-dissipating portion. The heat-absorbing portion is disposed within the receiving cavity and located on the side of the reflector away from the lens module. The heat-dissipating portion is located outside the receiving cavity and disposed on the side of the housing away from the lens module. The heat-absorbing portion includes a plurality of first fins spaced apart along a second direction, which is perpendicular to and coplanar with the first direction. Each first fin includes a first sub-fin near the first end and a second sub-fin near the second end. From the first sub-fin to the second sub-fin, the projected area of ​​the first fin in the second direction gradually decreases. A first fan is disposed within the receiving cavity; the first fan has a first air inlet end, which faces the heat absorption section.

2. The projection optical engine according to claim 1, characterized in that, The first heat sink further includes a base plate, and the heat absorption part and the heat dissipation part are connected through the base plate; The heat dissipation section includes a plurality of second fins spaced apart along a third direction on the surface of the base plate. The first fins and the second fins are respectively located on both sides of the base plate in the first direction, and the first direction, the second direction and the third direction are arranged perpendicular to each other.

3. The projection optical engine according to claim 2, characterized in that, The second fin includes a body portion and an extended portion. The orthographic projection of the body portion on the plane of the base plate at least partially overlaps with the orthographic projection of the heat-absorbing portion on the plane of the base plate. The orthographic projection of the extended portion on the plane of the base plate is located outside the orthographic projection of the heat-absorbing portion on the plane of the base plate.

4. The projection optical engine according to claim 3, characterized in that, The first heat sink further includes a first heat conductor, which includes a first heat conductor, a second heat conductor, and a third heat conductor connected in sequence. The first heat conductor passes through the body portion of the plurality of second fins along the arrangement direction of the second fins, and the third heat conductor passes through the extended portion of the plurality of second fins along the arrangement direction of the second fins. The second heat conductor connects the first heat conductor and the third heat conductor.

5. The projection optical engine according to claim 2, characterized in that, The base plate is connected to the first fin and / or the second fin by welding or integral extrusion molding.

6. The projection optical engine according to claim 1, characterized in that, The optical component also includes a light source, and the heat dissipation structure also includes a second heat dissipation component for dissipating heat from the light source. The second heat dissipation component includes a plurality of third fins arranged at intervals along the first direction or a third direction, wherein the first direction, the second direction and the third direction are arranged perpendicular to each other.

7. The projection optical engine according to claim 6, characterized in that, The second heat sink further includes a second heat-conducting element and a third heat-conducting element. The third heat-conducting element is connected to the light source. The second heat-conducting element includes a fourth heat-conducting part, a fifth heat-conducting part, and a sixth heat-conducting part connected in sequence. The fourth heat-conducting part is connected to the surface of the third heat-conducting element on the side away from the light source. The sixth heat-conducting part is disposed in multiple third fins along the arrangement direction of the third fins. The fifth heat-conducting part is connected to the fourth heat-conducting part and the sixth heat-conducting part.

8. The projection optical engine according to claim 6, characterized in that, The optical path propagation assembly also includes a focusing rod located outside the receiving cavity. The focusing rod is located between the light source and the reflector in the second direction. Along the direction away from the light source, the cross-sectional area of ​​the focusing rod in the second direction has a gradually increasing trend. The plurality of third fins are arranged at intervals along the third direction and are all located on one side of the focusing rod in the first direction. The third fins have a third end and a fourth end located on both sides in the second direction. The third end faces the light source. From the third end to the fourth end, the cross-sectional area of ​​the third fins in the second direction has a gradually decreasing trend.

9. The projection optical engine according to claim 6, characterized in that, The projection optical engine further includes a second fan, which has a second air inlet and a second air outlet arranged along the second direction. The second air inlet faces the second heat sink, and the second air outlet faces away from the second heat sink; or, the second air inlet faces away from the second heat sink, and the second air outlet faces the second heat sink.

10. A projection device, characterized in that, Includes the projection optical engine as described in any one of claims 1 to 9.

Images