A laser projection device
By using a heat dissipation structure combining rigid and flexible thermally conductive transparent layers with compression springs in a laser projection device, the heat dissipation problem of Fresnel lenses and LCD screens is solved, achieving efficient heat management and improving the stability and lifespan of optical components.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CAS LASER
- Filing Date
- 2025-07-08
- Publication Date
- 2026-06-12
AI Technical Summary
In existing laser projection devices, the Fresnel lenses and LCD screens have poor heat dissipation, which leads to increased temperature of optical components, affecting image quality and lifespan.
A heat conduction path is constructed by combining rigid and flexible thermally conductive transparent layers with compression springs, and combined with active cooling by a fan, to ensure uniform heat transfer and rapid heat dissipation.
It significantly reduces the temperature of optical components, avoids thermal deformation and optical parameter drift, extends service life, improves image quality, and reduces maintenance costs.
Smart Images
Figure CN224354706U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of projection technology, and in particular to a laser projection device. Background Technology
[0002] With the continuous development of display technology, laser projection devices have been widely used in the display field due to their high brightness, high contrast, and rich colors. However, in existing technologies, laser projection devices typically use Fresnel lenses for light homogenization, modulate the light through an LCD screen, and finally project the image onto the screen using a projection lens. While this optical system can achieve high-quality image projection, it faces a key problem in practical applications: poor heat dissipation.
[0003] Because laser light sources have high energy density, they generate a significant amount of heat during operation. In projection devices, the laser light is homogenized by a Fresnel lens, resulting in a more uniform energy distribution. However, this also leads to a more concentrated distribution of heat on the surface of optical components. Furthermore, the LCD screen absorbs some laser energy and converts it into heat when modulating light. If this heat cannot dissipate in time, it will cause the temperature of the optical components to rise, thus affecting their optical performance. For example, Fresnel lenses and LCD screens may experience thermal deformation and optical parameter drift at high temperatures, ultimately leading to a decrease in optical image quality, such as image blurring and color distortion. In addition, excessively high temperatures may shorten the lifespan of optical components and increase equipment maintenance costs.
[0004] Therefore, how to effectively solve the problem of poor heat dissipation of Fresnel lenses and LCD screens in existing laser projection devices, so as to improve optical imaging quality and equipment reliability, has become an urgent technical challenge in this field. Utility Model Content
[0005] In order to solve the above-mentioned problems of the prior art, the present invention provides a laser projection device.
[0006] To achieve the above objectives, the main technical solutions adopted by this utility model include:
[0007] A laser projection device includes a housing; within the housing, a laser source, a lens, a light rod, a reflector, a first Fresnel lens, an LCD screen, a second Fresnel lens, and a projection lens are sequentially arranged along an optical path; the first Fresnel lens, the LCD screen, and the second Fresnel lens are arranged parallel to each other; a first rigid thermally conductive transparent layer is connected to the first Fresnel lens; and a second rigid thermally conductive transparent layer is connected to the second Fresnel lens.
[0008] In one embodiment of this utility model, a bracket is fixedly connected inside the housing; the first rigid thermally conductive transparent layer is fixedly connected to the bracket; the second rigid thermally conductive transparent layer is fixedly connected to the bracket; and the LCD screen is fixedly connected to the housing.
[0009] In one embodiment of this utility model, the end face of the first Fresnel lens away from the LCD screen is a first plane; the first rigid thermally conductive transparent layer is connected to the first plane; the end face of the second Fresnel lens away from the LCD screen is a second plane; and the second rigid thermally conductive transparent layer is connected to the second plane.
[0010] In one embodiment of this utility model, a first flexible thermally conductive transparent layer is provided on the side of the LCD screen near the first Fresnel lens; a second flexible thermally conductive transparent layer is provided on the side of the LCD screen near the second Fresnel lens; a plurality of first compression springs are provided between the first rigid thermally conductive transparent layer and the first flexible thermally conductive transparent layer; and a plurality of second compression springs are provided between the second rigid thermally conductive transparent layer and the second flexible thermally conductive transparent layer.
[0011] In one embodiment of this utility model, a fan is fixedly connected to the bracket above the first rigid thermally conductive transparent layer; the first rigid thermally conductive transparent layer is provided with a first through hole opposite to the fan; the first flexible thermally conductive transparent layer is provided with a second through hole opposite to the first through hole; the second flexible thermally conductive transparent layer is provided with a third through hole opposite to the second through hole; the second rigid thermally conductive transparent layer is provided with a fourth through hole opposite to the third through hole; the first through hole and the second through hole are positioned opposite to the hollowed-out area in the middle of the first compression spring; the third through hole and the fourth through hole are positioned opposite to the hollowed-out area in the middle of the second compression spring.
[0012] In one embodiment of this utility model, the first through hole is located on the outer periphery of the first Fresnel lens; the second and third through holes are located on the outer periphery of the LCD screen; the fourth through hole is located on the outer periphery of the second Fresnel lens; one end of the first compression spring is fixedly connected to the first rigid thermally conductive transparent layer, and the other end is fixedly connected to the first flexible thermally conductive transparent layer; one end of the second compression spring is fixedly connected to the second rigid thermally conductive transparent layer, and the other end is fixedly connected to the second flexible thermally conductive transparent layer.
[0013] In one embodiment of this utility model, both the first rigid thermally conductive transparent layer and the second rigid thermally conductive transparent layer are thermally conductive transparent ceramics.
[0014] In one embodiment of this utility model, both the first flexible thermally conductive transparent layer and the second flexible thermally conductive transparent layer are transparent thermally conductive silicone sheets.
[0015] In one embodiment of this utility model, an annular rigid heat-conducting block is fixedly connected to the outer periphery of the LCD screen; the annular rigid heat-conducting block is sandwiched between the first flexible heat-conducting transparent layer and the second flexible heat-conducting transparent layer; the annular rigid heat-conducting block is fixedly connected to the housing.
[0016] In one embodiment of the present invention, the annular rigid heat-conducting block is provided with a flow guide hole that simultaneously communicates with the second through hole and the third through hole.
[0017] The beneficial effects of this invention are as follows: Through innovative heat dissipation structure design, it effectively solves the problem of poor heat dissipation performance of Fresnel lenses and LCD screens in existing technologies. This invention cleverly sets up a rigid thermally conductive transparent layer around key optical components, constructing an efficient heat conduction path. This rigid thermally conductive transparent layer provides stable support and rapidly conducts heat. The aforementioned rigid thermally conductive transparent layer structure not only significantly reduces the operating temperature of the optical components, avoiding problems such as thermal deformation and optical parameter drift caused by high temperatures, but also extends the service life of the components and reduces maintenance costs due to high-temperature damage.
[0018] By setting a flexible thermally conductive transparent layer to fit tightly against the component surface, heat is ensured to be transferred evenly; the setting of the compression spring is beneficial for the flexible thermally conductive transparent layer to expand and recover when it returns to normal temperature after being heated. Attached Figure Description
[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the structure of this utility model;
[0021] Figure 2 This is a schematic diagram of the LCD screen and the annular rigid heat-conducting block of this utility model.
[0022] Explanation of reference numerals in the attached figures:
[0023] 1. Laser source; 2. Lens; 3. Light bar; 4. Reflector; 5. First rigid thermally conductive transparent layer; 6. First Fresnel lens; 7. First flexible thermally conductive transparent layer; 8. LCD screen; 81. Annular rigid thermally conductive block; 82. Guide hole; 9. Second flexible thermally conductive transparent layer; 10. Second Fresnel lens; 11. Second rigid thermally conductive transparent layer; 12. Projection lens; 13. Support; 14. Housing; 15. First compression spring; 16. Second compression spring; 17. Fan; 18. First through hole; 19. Second through hole; 20. Third through hole; 21. Fourth through hole. Detailed Implementation
[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0025] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0027] Example:
[0028] like Figure 1 As shown, a laser projection device is characterized by: including a housing 14; within the housing 14, a laser light source 1, a lens 2, a light rod 3, a reflector 4, a first Fresnel lens 6, an LCD screen 8, a second Fresnel lens 10, and a projection lens 12 are sequentially arranged along the optical path; the first Fresnel lens 6, the LCD screen 8, and the second Fresnel lens 10 are arranged parallel to each other; a first rigid thermally conductive transparent layer 5 is connected to the first Fresnel lens 6; a second rigid thermally conductive transparent layer 11 is connected to the second Fresnel lens 10; it should be understood that the laser light source 1, the lens 2, the light rod 3, and the reflector 4 are fixedly installed within the housing 14, and can be fixedly connected using a support frame commonly used in the art; or the housing 14 itself is provided with sheet metal or limiting components for limiting related parts; in some embodiments, the lens 2 can also be fixed using photocurable adhesive.
[0029] In one embodiment of this invention, the laser beam emitted from the laser source 1 is converged by the lens 2 and then enters the light bar 3. The light bar 3 homogenizes the incoming beam. The beam emitted from the light bar 3 is reflected by the reflector 4 and then enters the first Fresnel lens 6, the LCD screen 8, and the second Fresnel lens 10. The beam is further homogenized by the combined use of the two Fresnel lenses. The LCD screen 8 modulates the beam into image light, and finally, the beam is transmitted through the projection lens 12. The two mutually distant surfaces of the aforementioned two Fresnel lenses are planes, and the two mutually close surfaces are lens surfaces. In one embodiment, the reflector 4 can be as follows: Figure 1 The center is set to a 45° tilt, thereby reducing the volume of the housing 14.
[0030] In one embodiment of the present invention, a bracket 13 is fixedly connected inside the housing 14; the first rigid thermally conductive transparent layer 5 is fixedly connected to the bracket 13; the second rigid thermally conductive transparent layer 11 is fixedly connected to the bracket 13; and the LCD screen 8 is fixedly connected to the housing 14.
[0031] In one embodiment of this utility model, the end face of the first Fresnel lens 6 away from the LCD screen 8 is a first plane; the first rigid thermally conductive transparent layer 5 is connected to the first plane; the end face of the second Fresnel lens 10 away from the LCD screen 8 is a second plane; the second rigid thermally conductive transparent layer 11 is connected to the second plane; the thickness of the first rigid thermally conductive transparent layer 5 is not an innovation of this utility model. Generally, the thickness of the first rigid thermally conductive transparent layer 5 does not exceed the thickness of the corresponding cooled optical element. For example, the thickness of the first rigid thermally conductive transparent layer 5 is less than the thickness of the first Fresnel lens 6; in one embodiment, the thickness of the first rigid thermally conductive transparent layer 5 can be adjusted according to the actual heat dissipation effect; in one embodiment, the thickness of the second rigid thermally conductive transparent layer 11 is less than the thickness of the second Fresnel lens 10; in one embodiment, the thickness of the second rigid thermally conductive transparent layer 11 can be adjusted according to the actual heat dissipation effect.
[0032] In one embodiment of this utility model, a first flexible thermally conductive transparent layer 7 is provided on the side of the LCD screen 8 near the first Fresnel lens 6; a second flexible thermally conductive transparent layer 9 is provided on the side of the LCD screen 8 near the second Fresnel lens 10; a plurality of first compression springs 15 are provided between the first rigid thermally conductive transparent layer 5 and the first flexible thermally conductive transparent layer 7; and a plurality of second compression springs 16 are provided between the second rigid thermally conductive transparent layer 11 and the second flexible thermally conductive transparent layer 9. By setting a first rigid thermally conductive transparent layer 5 on the upper surface of the first Fresnel lens 6, a first flexible thermally conductive transparent layer 7 and a second flexible thermally conductive transparent layer 9 on the upper and lower surfaces of the LCD screen 8, and a second rigid thermally conductive transparent layer 11 on the lower surface of the second Fresnel lens 10, an efficient heat conduction path is constructed. The rigid thermally conductive transparent layer provides stable support and conducts heat quickly, while the flexible thermally conductive transparent layer is closely attached to the surface of the component to ensure uniform heat transfer. The above-mentioned structure of rigid and flexible thermally conductive transparent layers not only significantly reduces the operating temperature of the optical component and avoids problems such as thermal deformation and optical parameter drift caused by high temperature, but also extends the service life of the component and reduces maintenance costs caused by high temperature damage.
[0033] Meanwhile, instead of two rigid thermally conductive transparent layers, two flexible thermally conductive transparent layers are set on both sides of the LCD screen 8. The purpose of this is that if rigid thermally conductive transparent layers were set on both sides of the LCD screen 8, the LCD screen 8 would be easily damaged when it expands due to heat. The setting of two flexible thermally conductive transparent layers is conducive to heat conduction and improves the heat conduction effect. At the same time, the setting of rigid thermally conductive transparent layers can play an effective supporting role, preventing excessive displacement of optical components and affecting image quality. The overall structure of the rigid thermally conductive transparent layers, flexible thermally conductive transparent layers and springs further improves the thermal conductivity of optical components, ensures the projection quality of the laser projection device, and extends the service life of components.
[0034] In one embodiment of this invention, one end of the first compression spring 15 is fixedly connected to the first rigid thermally conductive transparent layer 5, and the other end is fixedly connected to the first flexible thermally conductive transparent layer 7; one end of the second compression spring 16 is fixedly connected to the second rigid thermally conductive transparent layer 11, and the other end is fixedly connected to the second flexible thermally conductive transparent layer 9. In one embodiment, both the first compression spring 15 and the second compression spring 16 are located outside the optical path, thus not affecting the propagation of the light beam.
[0035] In one embodiment of this utility model, a fan 17 is fixedly connected to the bracket 13 above the first rigid thermally conductive transparent layer 5; the first rigid thermally conductive transparent layer 5 is provided with a first through hole 18 opposite to the fan 17; the first flexible thermally conductive transparent layer 7 is provided with a second through hole 19 opposite to the first through hole 18; the second flexible thermally conductive transparent layer 9 is provided with a third through hole 20 opposite to the second through hole 19; the second rigid thermally conductive transparent layer 11 is provided with a fourth through hole 21 opposite to the third through hole 20; the first through hole 18 and the second through hole 19 are positioned opposite to the hollowed-out area in the middle of the first compression spring 15; the third through hole 20 and the fourth through hole 21 are positioned opposite to the hollowed-out area in the middle of the second compression spring 16. Active heat dissipation is achieved through fan 17. The airflow from fan 17 can carry away heat through the first through hole 18, the second through hole 19, the third through hole 20, and the fourth through hole 21. Since the first through hole 18, the second through hole 19, the third through hole 20, and the fourth through hole 21 are interconnected, the number of fans 17 can be reduced. In one embodiment, the number of the first through hole 18, the second through hole 19, the third through hole 20, and the fourth through hole 21 can be several, that is, one or more, which can be appropriately adjusted according to the structural strength and heat dissipation requirements of the relevant components.
[0036] This invention uses a fan 17 to blow airflow towards the first rigid thermally conductive transparent layer 5, while simultaneously allowing airflow through the first through-hole 18 to the first flexible thermally conductive transparent layer 7, through the second through-hole 19 to the second flexible thermally conductive transparent layer 9, through the third through-hole 20 to the second rigid thermally conductive transparent layer 11, and out through the fourth through-hole 21. This further ensures the heat dissipation effect of the optical components. In the aforementioned airflow, heat dissipation is also provided for the two Fresnel lenses and the sides of the LCD screen 8. It should be noted that the fan 17 and the through-holes are all located outside the effective optical path, and the impact of the airflow on the optical path should be minimized as much as possible when installing the fan 17.
[0037] In one embodiment of this utility model, the first through hole 18 is located on the outer periphery of the first Fresnel lens 6; the second through hole 19 and the third through hole 20 are located on the outer periphery of the LCD screen 8; and the fourth through hole 21 is located on the outer periphery of the second Fresnel lens 10, thereby reducing the impact on the optical path.
[0038] In one embodiment of this utility model, the first rigid thermally conductive transparent layer 5 and the second rigid thermally conductive transparent layer 11 are both thermally conductive transparent ceramics.
[0039] In one embodiment of this utility model, the first flexible thermally conductive transparent layer 7 and the second flexible thermally conductive transparent layer 9 are both transparent thermally conductive silicone sheets.
[0040] This invention does not limit the material selection for rigid thermally conductive transparent layers and flexible thermally conductive transparent layers, as long as the support, thermal conductivity and light transmittance of the rigid thermally conductive transparent layer are guaranteed, and the deformability, thermal conductivity and light transmittance of the flexible thermally conductive transparent layer are guaranteed.
[0041] In one embodiment of this utility model, an annular rigid heat-conducting block 81 is fixedly connected to the outer periphery of the LCD screen 8; the annular rigid heat-conducting block 81 is sandwiched between the first flexible thermally conductive transparent layer 7 and the second flexible thermally conductive transparent layer 9; the annular rigid heat-conducting block 81 is fixedly connected to the housing 14. Figure 2 As shown, the upper and lower ends of the annular rigid heat-conducting block 81 are fixedly connected to the housing 14, and the left and right sides are fixedly connected to the housing 14. Figure 1 The second through holes 19 and the third through holes 20 on the left and right sides of the LCD screen 8 are fitted together; the annular rigid heat-conducting block 81 is used to fix the LCD screen 8 and provide rigid support; the annular rigid heat-conducting block 81 can also be used to support the first flexible thermally conductive transparent layer 7 and the second flexible thermally conductive transparent layer 9 located on the upper and lower sides of the annular rigid heat-conducting block 81. In one embodiment, the annular rigid heat-conducting block 81 can be a metal part.
[0042] In one embodiment of the present invention, the annular rigid heat-conducting block 81 is provided with a flow guide hole 82 that communicates with both the second through hole 19 and the third through hole 20; multiple flow guide holes 82 may be provided.
[0043] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. A laser projection device, characterized in that: The system includes a housing (14); inside the housing (14), a laser source (1), a lens (2), a light bar (3), a reflector (4), a first Fresnel lens (6), an LCD screen (8), a second Fresnel lens (10), and a projection lens (12) are arranged sequentially along the optical path; the first Fresnel lens (6), the LCD screen (8), and the second Fresnel lens (10) are arranged parallel to each other; a first rigid thermally conductive transparent layer (5) is connected to the first Fresnel lens (6); a second rigid thermally conductive transparent layer (11) is connected to the second Fresnel lens (10).
2. The laser projection device according to claim 1, characterized in that: A bracket (13) is fixedly connected inside the housing (14); the first rigid thermally conductive transparent layer (5) is fixedly connected to the bracket (13); the second rigid thermally conductive transparent layer (11) is fixedly connected to the bracket (13); and the LCD screen (8) is fixedly connected to the housing (14).
3. A laser projection device according to claim 2, characterized in that: The end face of the first Fresnel lens (6) away from the LCD screen (8) is a first plane; the first rigid thermally conductive transparent layer (5) is connected to the first plane; the end face of the second Fresnel lens (10) away from the LCD screen (8) is a second plane; the second rigid thermally conductive transparent layer (11) is connected to the second plane.
4. A laser projection device according to claim 3, characterized in that: The LCD screen (8) has a first flexible thermally conductive transparent layer (7) on the side near the first Fresnel lens (6); the LCD screen (8) has a second flexible thermally conductive transparent layer (9) on the side near the second Fresnel lens (10); a plurality of first compression springs (15) are provided between the first rigid thermally conductive transparent layer (5) and the first flexible thermally conductive transparent layer (7); a plurality of second compression springs (16) are provided between the second rigid thermally conductive transparent layer (11) and the second flexible thermally conductive transparent layer (9).
5. A laser projection device according to claim 4, characterized in that: A fan (17) is fixedly connected to the bracket (13) above the first rigid thermally conductive transparent layer (5); the first rigid thermally conductive transparent layer (5) is provided with a first through hole (18) opposite to the fan (17); the first flexible thermally conductive transparent layer (7) is provided with a second through hole (19) opposite to the first through hole (18); the second flexible thermally conductive transparent layer (9) is provided with a third through hole (20) opposite to the second through hole (19); the second rigid thermally conductive transparent layer (11) is provided with a fourth through hole (21) opposite to the third through hole (20); the first through hole (18) and the second through hole (19) are positioned opposite to the hollow area in the middle of the first compression spring (15); the third through hole (20) and the fourth through hole (21) are positioned opposite to the hollow area in the middle of the second compression spring (16).
6. A laser projection device according to claim 5, characterized in that: The first through hole (18) is located on the outer periphery of the first Fresnel lens (6); the second through hole (19) and the third through hole (20) are located on the outer periphery of the LCD screen (8); the fourth through hole (21) is located on the outer periphery of the second Fresnel lens (10); one end of the first compression spring (15) is fixedly connected to the first rigid thermally conductive transparent layer (5), and the other end is fixedly connected to the first flexible thermally conductive transparent layer (7); one end of the second compression spring (16) is fixedly connected to the second rigid thermally conductive transparent layer (11), and the other end is fixedly connected to the second flexible thermally conductive transparent layer (9).
7. A laser projection device according to any one of claims 1-6, characterized in that: Both the first rigid thermally conductive transparent layer (5) and the second rigid thermally conductive transparent layer (11) are thermally conductive transparent ceramics.
8. A laser projection device according to any one of claims 4-6, characterized in that: Both the first flexible thermally conductive transparent layer (7) and the second flexible thermally conductive transparent layer (9) are transparent thermally conductive silicone sheets.
9. A laser projection device according to any one of claims 5-6, characterized in that: An annular rigid heat-conducting block (81) is fixedly connected to the outer periphery of the LCD screen (8); the annular rigid heat-conducting block (81) is held by the first flexible heat-conducting transparent layer (7) and the second flexible heat-conducting transparent layer (9); the annular rigid heat-conducting block (81) is fixedly connected to the shell (14).
10. A laser projection device according to claim 9, characterized in that: The annular rigid heat-conducting block (81) is provided with a flow guide hole (82) that communicates with both the second through hole (19) and the third through hole (20).