Ultra-short-focus projection lens and laser projection equipment

Abstract

The embodiment of the invention belongs to the display technology, and provides an ultra-short-focus projection lens and laser projection equipment, and the ultra-short-focus projection lens comprises a lens seat; the lens assembly is arranged on the lens base and is used for carrying out imaging on an incident image light beam; the reflection unit is arranged on the mirror base, the reflection unit comprises a reflection mirror with a reflection surface, and the reflection surface is used for reflecting an imaging light beam emitted by the lens assembly to a set position; the reflection unit further comprises a heat dissipation channel and a heat dissipation medium arranged in the heat dissipation channel. The problem of thermal deformation of the reflector can be improved.

Description

Technical Field

[0001] Embodiments of the present application relate to display technology. In particular, it relates to an ultra-short throw projection lens and a laser projection device. Background Art

[0002] With the rapid development of projection technology, ultra-short throw projection technology has received extensive attention due to its advantage of being able to project a large image within a short distance.

[0003] An ultra-short throw projection device includes a laser light source, an optical engine, an ultra-short throw lens, and a projection screen. The laser light source is used to provide a laser beam to the optical engine. The optical engine is used to modulate the laser beam emitted by the laser light source and obtain an image beam directed to the ultra-short throw lens. The ultra-short throw lens is used to image the image beam, and a reflector within the ultra-short throw lens can reflect the image beam to the projection screen for imaging.

[0004] Since the laser energy is relatively high, when the reflector reflects the image beam, it will absorb part of the energy of the image beam, causing the temperature of the reflector to rise, resulting in deformation of the reflector due to heat, a change in the focal depth of the reflector, and a poor display effect of the projection image on the projection screen. Summary of the Invention

[0005] Embodiments of the present application provide an ultra-short throw projection lens and a laser projection device, which can improve the problem of heat-induced deformation of the reflector, and the laser projection device has a better projection display effect.

[0006] In a first aspect, embodiments of the present application provide an ultra-short throw projection lens, including:

[0007] A lens mount;

[0008] A lens assembly disposed on the lens mount for imaging an incident image beam;

[0009] And a reflection unit disposed on the lens mount. The reflection unit includes a reflector having a reflective surface, and the reflective surface is used to reflect the imaging beam emitted by the lens assembly to a set position;

[0010] The reflection unit further includes a heat dissipation channel and a heat dissipation medium disposed inside the heat dissipation channel, or the reflection unit further has a non-metallic heat conduction structure, and the thermal conductivity of the non-metallic heat conduction structure is greater than or equal to 1.4 W / (m·K).

[0011] In this way, by providing a non-metallic heat conduction structure on the reflection unit or by providing a heat dissipation medium inside the reflection unit, the heat conduction performance of the reflection unit can be improved, and the phenomenon of excessive heat concentration in the reflection unit can be improved. Therefore, the problem of poor projection display effect caused by heat-induced deformation of the reflector can be improved.

[0012] In some embodiments of the present application, the reflection unit further includes a heat-conducting pipe fitting, which is disposed on the side of the mirror facing away from the reflective surface, and the heat-conducting pipe fitting forms a heat dissipation channel for accommodating the heat dissipation medium. In this way, by reasonably designing the path of the heat-conducting pipe fitting to make the path of the heat dissipation channel conform to the heat distribution on the mirror, the temperature of the mirror can be reduced. In addition, the heat-conducting pipe fitting and the heat dissipation medium can be pre-assembled into a component and then assembled with the mirror, which can improve the assembly efficiency of the reflection unit.

[0013] In some embodiments of the present application, a receiving portion is defined on the side of the mirror facing away from the reflective surface, and the heat-conducting pipe fitting is disposed inside the receiving portion. In this way, by disposing the heat-conducting pipe fitting inside the receiving portion, the heat exchange area between the heat-conducting pipe fitting and the mirror can be increased, which helps to improve the heat dissipation capacity of the mirror. In addition, the volume of the reflection unit can be reduced, which helps to miniaturize the reflection unit.

[0014] In some embodiments of the present application, a heat-conducting medium is filled between the mirror and the heat-conducting pipe fitting. In this way, the heat conductivity between the heat-conducting pipe fitting and the mirror can be improved, which helps to further improve the heat dissipation capacity of the mirror.

[0015] In some embodiments of the present application, the inner wall of the heat-conducting pipe fitting is provided with microstructures. In this way, the heat exchange area between the heat-conducting pipe fitting and the heat dissipation medium can be increased, so that the heat conduction speed of the heat-conducting pipe fitting can be increased, and further the heat dissipation capacity of the heat-conducting pipe fitting can be improved.

[0016] In some embodiments of the present application, the heat-conducting pipe fitting includes a pipe body and a graphene heat dissipation film attached to the inner wall of the pipe body. In this way, the heat transfer between the heat dissipation medium and the heat-conducting pipe fitting can be improved, which helps to further improve the heat dissipation capacity of the heat-conducting pipe fitting.

[0017] In some embodiments of the present application, the mirror includes a heat-conducting covering member and a lens body having the reflective surface, and the covering member is disposed on the side of the lens body facing away from the reflective surface and encloses the heat dissipation channel for accommodating the heat dissipation medium with the lens body. In this way, on the premise of forming the heat dissipation channel for accommodating the heat dissipation medium, the heat transfer path can be further shortened and the thermal resistance can be reduced, which helps to further improve the heat dissipation capacity of the mirror.

[0018] In some embodiments of the present application, the reflection unit further includes a micro pump, which is used to drive the heat dissipation medium to circulate inside the heat dissipation channel. In this way, by driving the heat dissipation medium to circulate inside the heat dissipation channel by the micro pump, the flow rate of the heat dissipation medium can be increased, which helps to further improve the heat dissipation effect. In addition, the heat dissipation medium can be timely returned to ensure that the heat generated by the mirror is timely taken away by the heat dissipation medium.

[0019] In some embodiments of the present application, the mirror has a first temperature region and a second temperature region, the optical power density corresponding to the first temperature region is greater than that of the second temperature region, and the projection of the heat dissipation channel on the reflecting surface covers at least a part of the first temperature region.

[0020] Since the optical power density corresponding to the first temperature region is greater than that of the second temperature region, the temperature of the first temperature region is greater than that of the second temperature region, and then the temperatures of different regions of the mirror are different. Therefore, by controlling the direction of the heat dissipation channel, the heat dissipation medium can exchange heat with different regions of the mirror, so that the temperature of each part of the mirror is within a reasonable range, thereby avoiding excessive energy concentration at one or more places of the mirror, and further avoiding changes in the surface shape of the mirror.

[0021] In some embodiments of the present application, the heat dissipation medium is a phase change medium or the heat dissipation medium includes nano-scale heat-conducting particles and a heat-conducting fluid. In this way, by using the phase change medium as the heat dissipation medium or the heat dissipation medium composed of nano-scale heat-conducting particles and a heat-conducting fluid, the heat generated by the mirror can be taken away in time, so that the temperature of the mirror is within a reasonable range, and the problem of deformation of the mirror due to heat can be improved.

[0022] A second aspect of the embodiments of the present application provides an ultra-short focal length projection lens, including a lens mount, a lens assembly, and a reflection unit. The reflection unit and the lens assembly are respectively arranged on the lens mount. The reflection unit includes a mirror, the mirror has a heat dissipation channel and a heat-conducting medium arranged inside the heat dissipation channel, or the mirror has a non-metallic part, and the thermal conductivity of the non-metallic part is greater than or equal to 1.4 W / (m·K).

[0023] In this way, by providing a non-metallic heat-conducting structure on the mirror or by providing a heat dissipation medium inside the reflection unit, the heat conduction performance of the mirror can be improved, and the phenomenon of excessive heat concentration in the reflection unit can be improved, so that the problem of poor projection display effect caused by heat deformation of the mirror can be improved.

[0024] A third aspect of the embodiments of the present application provides a laser projection device, including a laser light source, an optical engine, and the ultra-short focal length projection lens according to any one of the first aspect or the second aspect. The optical engine is configured to generate an image beam according to the laser beam provided by the laser light source and project the image beam onto the ultra-short focal length projection lens.

[0025] In this way, since the ultra-short focal length projection lens in the above first aspect or second aspect has good resolution ability, the laser projection device can have a good projection display effect. Description of the Drawings

[0026] To more clearly illustrate the embodiments of the present application or the implementation manners in related technologies, the following will briefly introduce the drawings required for the description of the embodiments or related technologies. Obviously, the drawings below are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0027] Figure 1 Schematic structural diagram of a laser projection device provided by an embodiment of the present application;

[0028] Figure 2 For Figure 1 exploded schematic diagram of the ultra-short throw projection lens in

[0029] Figure 3 For Figure 1 internal structural schematic diagram of the ultra-short throw projection lens in

[0030] Figure 4 Schematic structural diagram of the first reflection unit provided by an embodiment of the present application;

[0031] Figure 5 For Figure 4 schematic diagram of the cross-sectional view angle of the reflection unit in

[0032] Figure 6 For Figure 5 schematic diagram of the heat-conducting pipe fitting arranged in the accommodating part in

[0033] Figure 7 For Figure 4 schematic diagram of the light energy distribution of the reflecting mirror in

[0034] Figure 8 Schematic structural diagram of the second reflection unit provided by an embodiment of the present application;

[0035] Figure 9 Schematic structural diagram of the third reflection unit provided by an embodiment of the present application;

[0036] Figure 10 Schematic structural diagram of the fourth reflection unit provided by an embodiment of the present application;

[0037] Figure 11 For Figure 10 exploded schematic diagram of the reflection unit in

[0038] Figure 12 For Figure 11 schematic diagram of the structure of the lens body in

[0039] Figure 13 Schematic structural diagram of the fourth reflection unit provided by an embodiment of the present application.

[0040] Description of the reference numerals in the drawings:

[0041] 10. Ultra-short focal length projection lens; 20. Laser light source; 30. Optical engine; 40. Laser projection device;

[0042] 100. Lens holder; 200. Lens assembly; 300. Reflection unit;

[0043] 310. Reflecting mirror; 311. Lens body; 3111. Constituent part; 312. Covering member;

[0044] 320. Heat dissipation channel;

[0045] 330. Heat conduction pipe fitting; 331. First pipe section; 332. Second pipe section;

[0046] 400. Accommodating part;

[0047] 500. Micro pump;

[0048] 600. Non-metallic heat conduction structure;

[0049] A. First temperature region; B. Second temperature region; M. Reflective surface. Detailed implementation manners

[0050] To make the objectives, implementation manners and advantages of the present application clearer, the following will clearly and completely describe the exemplary implementation manners of the present application with reference to the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only a part of the embodiments of the present application, rather than all of the embodiments.

[0051] It should be noted that the brief description of the terms in the present application is only for the convenience of understanding the subsequent described implementation manners, rather than intending to limit the implementation manners of the present application. Unless otherwise specified, these terms should be understood according to their ordinary and common meanings.

[0052] In addition, the terms "include" and "have" and any variations thereof are intended to cover but not exclusively include. For example, a product or device including a series of components does not necessarily have to be limited to those components clearly listed, but may include other components not clearly listed or inherent to these products or devices.

[0053] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0054] The terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0055] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0056] Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0057] In the related art, when the projection device is working, the reflector will absorb part of the energy of the image beam, resulting in an increase in the temperature of the reflector. Moreover, as the temperature of the reflector increases, the reflector will expand and deform, and then a temperature drift phenomenon occurs. That is to say, after the reflector deforms, the focusing position of the reflector changes, thereby resulting in a poor display effect of the projection device. And the smaller the focal depth of the lens, the greater the influence of the reflector deformation on the display effect.

[0058] In view of this, the embodiments of this application provide an ultra-short throw projection lens and a laser projection device. By providing a non-metallic heat conduction structure on the reflection unit of the ultra-short throw projection lens or providing a heat dissipation channel inside the reflection unit and a heat dissipation medium located inside the heat dissipation channel, the heat conduction performance of the reflector can be improved, the heat conduction amount between the reflector and the air can be increased, and the purpose of reducing the temperature of the reflector can be achieved. In addition, it is also possible to avoid the excessive concentration of heat at a certain position of the reflector, and improve the problem of poor projection display effect caused by the heat deformation of the reflector.

[0059] Figure 1 It is a schematic structural diagram of a laser projection device provided by an embodiment of this application.

[0060] See Figure 1As shown in the figure, the laser projection device 40 provided by the embodiment of the present application includes a laser light source 20, an optical engine 30, and an ultra-short-throw projection lens 10. Among them, the laser light source 20 is used to emit a laser beam. The optical engine 30 is used to generate an image beam according to the laser beam provided by the laser light source 20, and project the image beam onto the ultra-short-throw projection lens 10 for imaging. The ultra-short-throw projection lens 10 is used to project the imaging to a set position.

[0061] In some implementation manners, the laser projection device 40 may further include a projection screen (not shown in the figure), and the ultra-short-throw projection lens 10 may project an image onto the projection screen to realize the display of the picture.

[0062] Figure 2 For Figure 1 the exploded schematic diagram of the ultra-short-throw projection lens in Figure 3 For Figure 1 the internal structure schematic diagram of the ultra-short-throw projection lens in

[0063] Referring to Figure 2 and Figure 3 As shown in the figure, the ultra-short-throw projection lens 10 provided by the embodiment of the present application includes a lens mount 100, a lens assembly 200, and a reflection unit 300. Among them, the lens assembly 200 and the reflection unit 300 are respectively arranged on the lens mount 100. The lens assembly 200 is used to image the incident image beam. Specifically, the lens assembly 200 is used to process the image beam emitted by the optical engine 30 and generate an imaging beam that shoots towards the reflection unit 300. The reflection unit 300 is used to reflect the imaging beam generated by the lens assembly 200 to a set position, for example, reflect the imaging beam generated by the lens assembly 200 to a projection screen (not shown in the figure).

[0064] For the specific structure of the lens mount 100, no specific limitation is made here. In some implementation manners, referring to Figure 2 and Figure 3 As shown in the figure, the lens mount 100 may be a shell-like structure, and the lens assembly 200 and the reflection unit 300 may be arranged inside the lens mount 100. In this way, the lens assembly 200 and the reflection unit 300 can be protected by the lens mount 100.

[0065] For the specific material of the lens mount 100, no limitation is made here. In some implementation manners, the lens mount 100 may be plastic, which helps to reduce the weight of the lens mount 100. In addition, it can also reduce the cost of the lens mount 100.

[0066] For the requirements such as the number, type, and arrangement method of the lenses constituting the lens assembly 200, no specific limitation is made here. Among them, the lens assembly 200 only needs to meet the requirement of being able to process the influence beam emitted by the optical engine 30 into an imaging beam that shoots out of the reflection unit 300.

[0067] Figure 4 The structural schematic diagram of the first reflection unit provided by the embodiment of the present application Figure 5 is Figure 4 a schematic diagram of the sectional view angle of the reflection unit in Figure 6 is Figure 5 a schematic diagram of the heat-conducting pipe fitting arranged in the accommodating part in

[0068] Referring to Figure 5 as shown, the reflection unit 300 may include a reflector 310 having a reflecting surface M, and the reflecting surface M can reflect the imaging light beam emitted by the lens assembly 200 to a set position

[0069] In some implementation manners, the reflecting surface M is the concave surface of the reflector 310, which can not only reflect the imaging light beam to the set position, but also play a role in magnifying the image projected to the set position

[0070] There is no limitation on the type of the reflector 310 here. In some implementation manners, the reflector 310 may be an injection-molded lens, and the injection-molded lens can be manufactured by an injection molding method, which can reduce the manufacturing cost of the reflector 310. In addition, the material of the injection-molded lens is usually optical plastic, which can further reduce the manufacturing cost of the reflector 310. In addition, the injection-molded lens can also have good anti-deformation ability at a relatively small thickness. In other implementation manners, the reflector 310 may also be a glass lens, and the glass lens has good anti-deformation ability. In the embodiment of the present application, the reflector 310 is taken as an injection-molded lens for illustration

[0071] In order to further improve the reflectivity of the reflection unit 300 to the imaging light beam, in some possible implementation manners, the reflection unit 300 may further include a film layer (not shown in the figure) for reflecting the imaging light beam, and the film layer may be a metal film or a non-metal film. It should be noted that when the film layer exists, the reflecting surface M can be understood as the surface of the film layer facing the lens assembly 200

[0072] In order to improve the problem that the projection display effect of the reflector 310 is poor due to heat deformation, the reflection unit 300 further includes a heat dissipation channel 320 (as Figure 6 shown) and a heat dissipation medium (not shown in the figure) arranged inside the heat dissipation channel 320. During the process of the reflection unit 300 reflecting the imaging light beam, the heat dissipation medium exchanges heat with the reflector 310, and can absorb the heat on the reflector 310 and transfer it to the air

[0073] Correspondingly, by arranging a heat dissipation medium inside the reflection unit 300 to exchange heat with the mirror 310, the heat conduction performance of the mirror 310 can be improved, the heat on the mirror 310 can be taken away in time, the phenomenon of excessive heat concentration on the mirror 310 can be improved, and the problem of poor projection display effect caused by thermal deformation of the mirror 310 can be improved.

[0074] There is no limitation on the specific type of the heat dissipation medium here. In some implementation manners, the heat dissipation medium can be a phase change medium. By absorbing the heat on the mirror 310 and undergoing a phase change, the heat on the mirror 310 can be transferred to the air in time, so that the temperature of the mirror 310 is within a reasonable range, the heat dissipation capacity of the mirror 310 can be improved, and the problem of thermal deformation of the mirror 310 can be improved.

[0075] Specifically, the phase change medium in the heat dissipation channel 320 can be heated at the heat source end until a phase change occurs, and then a heat convection is formed in the heat dissipation channel 320. After cooling at the heat dissipation end, it flows back to the heat source end, and so on, to achieve the purpose of accelerating heat transfer, so that the heat on the mirror 310 can be transferred to the air in time. Among them, the phase change medium absorbs the heat on the mirror 310 at the heat source end, and the phase change medium transfers the heat to the air at the heat dissipation end.

[0076] The phase change medium can be a thermal conductive gel, water, mineral oil, fluorinated liquid, solid-liquid phase change material, solid-solid phase change material, etc. Exemplarily, when the phase change medium is water, water absorbs the heat on the mirror 310 at the heat source end and changes from a liquid state to a gaseous state, and then exchanges heat with the air at the heat dissipation end and condenses into liquid water and flows back to the heat source end, taking away the heat on the mirror 310 reciprocally.

[0077] In some other implementation manners, the heat dissipation medium can also include nano-scale heat conductive particles and a heat conductive fluid. In this way, by mixing the nano-scale heat conductive particles and the heat conductive fluid, the heat dissipation medium can have a high heat conductivity coefficient, the heat generated by the mirror 310 can be taken away in time, so that the temperature of the mirror 310 is within a reasonable range, and the problem of thermal deformation of the mirror 310 can be improved. Among them, the nano-scale heat conductive particles can be nano-scale metal particles, nano-scale metal oxide particles, etc., and there is no specific limitation here.

[0078] By adding nano-scale heat-conducting particles to the heat-conducting fluid, the structure of the heat-conducting fluid can be changed, the energy transfer process inside the heat-conducting fluid can be enhanced, and the thermal conductivity coefficient can be increased. In addition, due to the small-size effect of the nano-scale heat-conducting particles, there is a micro-convection phenomenon between the nano-scale heat-conducting particles and the heat-conducting fluid. This micro-convection enhances the energy transfer process between the nano-scale heat-conducting particles and the heat-conducting fluid, increasing the thermal conductivity coefficient of the heat dissipation medium. Therefore, after the nano-scale heat-conducting particles and the heat-conducting fluid are mixed, the heat dissipation medium can have a high thermal conductivity coefficient, improving the heat dissipation ability of the mirror 310.

[0079] The number of the heat dissipation channels 320 can be one or more. Among them, when the number of the heat dissipation channels 320 is multiple, the shapes of the multiple heat dissipation channels 320 can be the same, or partially the same, or different. In addition, when the number of the heat dissipation channels 320 is multiple, the multiple heat dissipation channels 320 can be non-connected, or partially connected, or connected.

[0080] The light power densities corresponding to different positions of the mirror 310 are different, resulting in different temperatures at different positions of the mirror 310. Therefore, the mirror 310 can be regionally divided according to the light power density (heat) to determine how to lay out the heat dissipation channels 320. In other words, the specific shape and orientation of the heat dissipation channels 320 can be determined according to the heat distribution of the mirror 310, and no specific restrictions are made here.

[0081] Figure 7 For Figure 4 is a schematic diagram of the light energy distribution of the mirror in Figure 7 It refers to a schematic diagram of the light energy distribution on the mirror 310 when the mirror 310 reflects and forms an imaging beam.

[0082] In some possible implementation manners, as Figure 7 shown, the mirror 310 can have a first temperature region A and a second temperature region B. Among them, the light power density corresponding to the first temperature region A is greater than that of the second temperature region B. Correspondingly, the heat absorbed by the first temperature region A is greater than that of the second temperature region B, making the temperature of the first temperature region A higher than that of the second temperature region B. The projection of the heat dissipation channel 320 on the reflective surface M covers at least part of the first temperature region A, so that the heat dissipation medium can dissipate heat from the first temperature region A, keeping the temperature of the first temperature region A within a reasonable range to prevent excessive heat concentration in the first temperature region A from causing excessive deformation of the surface shape of the mirror 310.

[0083] Among them, the first temperature region A can also be called the high-temperature region or the high-energy region, and the second temperature region B can also be called the low-temperature region or the low-energy region.

[0084] The number of the first temperature regions A can be one or more. For example, Figure 7 as shown, the number of the first temperature regions A is two, located at the lower left and lower right of the mirror 310 respectively. In some implementation manners, the number of the first temperature regions A can also be more than two.

[0085] When the number of the first temperature regions A is more than one, the optical power densities corresponding to the multiple first temperature regions A can be the same, or can be different, or can be partially the same and partially different. Among them, it is only required that the optical power density corresponding to any one of the first temperature regions A is greater than the optical power density corresponding to the second temperature region B.

[0086] When the number of the first temperature regions A is more than one, the areas corresponding to the multiple first temperature regions A can be the same, or can be partially the same, or can be different.

[0087] The number of the second temperature regions B can be one or more. For example, Figure 7 as shown, the number of the second temperature regions B is two, located at the upper left and upper right of the mirror 310 respectively. In some implementation manners, the number of the second temperature regions B can also be more than two.

[0088] When the number of the second temperature regions B is more than one, the optical power densities corresponding to the multiple second temperature regions B can be the same, or can be different, or can be partially the same and partially different. Among them, it is only required that the optical power density corresponding to any one of the second temperature regions B is greater than the optical power density corresponding to the second temperature region B.

[0089] When the number of the second temperature regions B is more than one, the areas corresponding to the multiple second temperature regions B can be the same, or can be partially the same, or can be different.

[0090] Regarding the covering relationship between the heat dissipation channel 320, the first temperature region A and the second temperature region B, it can be determined according to the heat dissipation requirement. In some implementation manners, the projection of the heat dissipation channel 320 on the reflective surface M can cover part of the first temperature region A. In some other implementation manners, the projection of the heat dissipation channel 320 on the reflective surface M can also cover the entire first temperature region A. In yet another implementation manner, the projection of the heat dissipation channel 320 on the reflective surface M can also cover part of the first temperature region A and part of the second temperature region B. In another implementation manner, the projection of the heat dissipation channel 320 on the reflective surface M can also cover the entire first temperature region A and the entire second temperature region B.

[0091] Therefore, the heat dissipation channel 320 may be arranged in the area corresponding to the first temperature area A to dissipate heat for the first temperature area A, or the heat dissipation channel 320 may be arranged in the area corresponding to the first temperature area A and the second temperature area B to dissipate heat for both the first temperature area A and the second temperature area B. In this way, the deformation of the reflector 310 can be controlled within a reasonable range to avoid affecting the display effect.

[0092] In some implementations, when the heat dissipation channels 320 corresponding to the first temperature region A and the second temperature region B are connected, the heat dissipation medium in the heat dissipation channel 320 corresponding to the first temperature region A can move to the heat dissipation channel 320 corresponding to the second temperature region B after absorbing heat. In this way, the heat dissipation speed of the heat dissipation medium can be further accelerated, which helps to balance the heat.

[0093] In some other implementations, when the first temperature region A and the second temperature region B both correspond to the heat dissipation channels 320 , the heat dissipation channels 320 corresponding to the first temperature region A and the second temperature region B may also be disconnected.

[0094] In order to further improve the heat dissipation speed of the first temperature region A, in some implementations, the first temperature region A may correspond to a long arc-shaped heat dissipation channel 320 with fewer inflection points, which can improve the heat dissipation speed.

[0095] In order to improve the heat dissipation speed of the second temperature region B, in some implementations, the second temperature region B may correspond to a heat dissipation channel 320 with more inflection points, which may improve uniformity and heat dissipation speed.

[0096] In order to construct the heat dissipation channel 320 for accommodating the heat dissipation medium, in some possible implementations, such as Figures 4 to 6 As shown, the reflection unit 300 may further include a heat-conducting pipe 330, which is disposed on a side of the reflector 310 away from the reflective surface M, and the heat-conducting pipe 330 forms a heat dissipation channel 320 for accommodating a heat dissipation medium. In the process of the reflection unit 300 reflecting the imaging light beam, the heat dissipation medium may exchange heat with the reflector 310 through the heat-conducting pipe 330, and exchange heat with the air through the heat-conducting pipe 330, so as to transfer the heat on the reflector 310 to the air, and the heat conduction performance of the heat in the reflector 310 may be improved.

[0097] Through the heat conduction pipe fitting 330, the heat dissipation medium can conduct the heat of the mirror 310 to the air, so as to prevent the heat of one or more positions of the mirror 310 from being too concentrated and causing excessive deformation of the surface shape of the mirror 310. In addition, by reasonably designing the direction of the heat conduction pipe fitting 330, the direction of the heat dissipation channel 320 can be made to conform to the heat distribution on the mirror 310, which can reduce the temperature of the mirror 310. In addition, the heat conduction pipe fitting 330 and the heat dissipation medium can be pre-assembled into a component and then assembled with the mirror 310, which can improve the assembly efficiency of the reflection unit 300.

[0098] There is no limit to the specific number of the heat conduction pipe fittings 330. Exemplarily, as Figure 4 shown, the number of the heat conduction pipe fittings 330 is eight. Of course, the number of the heat conduction pipe fittings 330 can also be more or less than eight.

[0099] Of course, when there are multiple heat conduction pipe fittings 330, the structures or shapes of the multiple heat conduction pipe fittings 330 can be the same, or can be different, or can be partially the same and partially different.

[0100] As Figure 4 shown, the first temperature region A corresponds to four heat conduction pipe fittings 330. Of course, the number of the heat conduction pipe fittings 330 corresponding to the first temperature region A can also be more or less than four.

[0101] As Figure 4 shown, the second temperature region B corresponds to four heat conduction pipe fittings 330. Of course, the number of the heat conduction pipe fittings 330 corresponding to the second temperature region B can also be more or less than four.

[0102] As Figure 4 shown, a part of the heat conduction pipe fitting 330 corresponds to the first temperature region A and the other part corresponds to the second temperature region B. Of course, the heat conduction pipe fittings 330 corresponding to the first temperature region A and the second temperature region B can also be not connected.

[0103] The shape of the heat conduction pipe fitting 330 can be determined according to the direction of the heat dissipation channel 320 or according to the heat distribution on the mirror 310. In some implementation manners, as Figure 4 shown, the heat conduction pipe fitting 330 can include a long arc-shaped first pipe section 331 and a second pipe section 332 with multiple corners. The first pipe section 331 corresponds to the first temperature region A, and the second pipe section 332 corresponds to the second temperature region B. Since the first pipe section 331 is long arc-shaped, the inflection points of the heat dissipation channel 320 formed by the first pipe section 331 are few. Since the second pipe section 332 has multiple corners, the heat dissipation channel 320 formed by the second pipe section 332 has multiple inflection points.

[0104] In some other implementation manners, the heat conduction pipe fitting 330 can also be a long arc-shaped pipe structure, asFigure 8 As shown in the figure. Among them, Figure 8 This is a schematic structural diagram of the second reflection unit provided by the embodiment of the present application.

[0105] In order to improve the heat conduction effect of the heat conduction pipe fitting 330, the heat conduction pipe fitting 330 can be made of a high heat conduction material. Among them, the high heat conduction material can be a metal material, a non-metal material, or a mixed heat conduction material composed of a metal material and a non-metal material. For example, the heat conduction pipe fitting 330 can be made of copper.

[0106] Regarding the specific structure of the heat conduction pipe fitting 330, no limitation is made here. In some implementation manners, the heat conduction pipe fitting 330 can be a heat pipe. In this way, on the premise of improving the heat dissipation ability of the mirror 310, the cost of the heat conduction pipe fitting 330 can be reduced.

[0107] In some other implementation manners, the inner wall of the heat conduction pipe fitting 330 can also be provided with microstructures (not shown in the figure). By providing microstructures on the inner wall of the heat conduction pipe fitting 330, the heat exchange area between the heat conduction pipe fitting 330 and the heat dissipation medium can be increased, thereby the heat conduction speed of the heat conduction pipe fitting 330 can be increased, and further the heat dissipation ability of the heat conduction pipe fitting 330 can be improved.

[0108] Regarding the specific structure of the microstructures, no limitation is made here. Exemplarily, the microstructures can include a plurality of columnar parts (not shown in the figure). In addition, the microstructures can be regular microstructures or irregular microstructures, and no limitation is made here.

[0109] In still some other implementation manners, the heat conduction pipe fitting 330 can also include a pipe body (not shown in the figure) and a graphene heat dissipation film attached to the inner wall of the pipe body (not shown in the figure). By utilizing the high heat conduction property of the graphene heat dissipation film, the heat transfer property between the heat dissipation medium and the heat conduction pipe fitting 330 can be increased, which helps to further improve the heat dissipation ability of the heat conduction pipe fitting 330.

[0110] Among them, the graphene heat dissipation film can be composed of one or more layers of graphene layers.

[0111] Among them, the pipe body can be made of a metal material, a non-metal material, or a mixed material composed of a metal material and a non-metal material, and no specific limitation is made here.

[0112] In order to further improve the heat conduction property between the heat conduction pipe fitting 330 and the mirror 310, in some implementation manners, a heat conduction medium (not shown in the figure) can also be filled between the mirror 310 and the heat conduction pipe fitting 330. In this way, the heat conduction property between the heat conduction pipe fitting 330 and the mirror 310 can be increased, which helps to further improve the heat dissipation ability of the mirror 310.

[0113] Among them, the heat-conducting medium can be heat-conducting silicone grease, heat-conducting silica gel, etc. In addition, the heat-conducting medium can be in the shape of a sheet, paste, etc.

[0114] In order to increase the heat exchange area between the mirror 310 and the heat-conducting pipe fitting 330, in some possible implementation manners, such as Figure 6 As shown, a receiving portion 400 can be formed on the side of the mirror 310 facing away from the reflecting surface M, and the heat-conducting pipe fitting 330 is disposed inside the receiving portion 400.

[0115] By disposing the heat-conducting pipe fitting 330 inside the receiving portion 400, the heat exchange area between the heat-conducting pipe fitting 330 and the mirror 310 can be increased, which helps to improve the heat dissipation capacity of the mirror 310. In addition, the volume of the reflection unit 300 can also be reduced, which helps to miniaturize the reflection unit 300.

[0116] Combined with Figure 6 it can be seen that the receiving portion 400 is a groove formed on the side of the mirror 310 facing away from the reflecting surface M, and the shape of the groove matches the shape of the heat-conducting pipe fitting 330.

[0117] When the mirror 310 is an injection-molded lens, in some implementation manners, the heat-conducting pipe fitting 330 can also be disposed inside the mirror 310 (not shown in the figure), which can also improve the heat transfer performance of the mirror 310 and can also improve the heat dissipation capacity of the mirror 310.

[0118] In order to fixedly connect the heat-conducting pipe fitting 330 and the mirror 310, in some implementation manners, the heat-conducting pipe fitting 330 can be fixedly connected to the mirror 310 by bonding. In some other implementation manners, the heat-conducting pipe fitting 330 can also be embedded inside the receiving portion 400, so that the outer wall of the heat-conducting pipe fitting 330 abuts against the inner wall of the receiving portion 400, and the heat-conducting pipe fitting 330 and the mirror 310 can be fixedly connected. In some other implementation manners, the reflection unit 300 can further include a fixing member, and the fixing member covers the heat-conducting pipe fitting 330 and is fixedly connected to the mirror 310 to fixedly connect the mirror 310 and the heat-conducting pipe fitting 330.

[0119] Figure 9 This is a schematic structural diagram of the third reflection unit provided by the embodiment of the present application.

[0120] Figure 9 Compared with Figure 4The difference lies in that the shapes and quantities of the heat-conducting pipe fittings 330 are different, and the reflection unit 300 further includes a micropump. Among them, the micropump 500 is used to drive the heat dissipation medium to circulate inside the heat dissipation channel 320. In this way, by driving the heat dissipation medium to circulate inside the heat dissipation channel 320 through the micropump 500, the flow rate of the heat dissipation medium can be increased, which helps to further improve the heat dissipation effect. In addition, the heat dissipation medium can be made to flow back in time to ensure that the heat generated by the mirror 310 is taken away by the heat dissipation medium in time.

[0121] See Figure 9 As shown, the number of the heat-conducting pipe fittings 330 is two. Of course, the number of the heat-conducting pipe fittings 330 can also be more or less than two. In addition, the two heat-conducting pipe fittings 330 are symmetrically arranged. Of course, the two heat-conducting pipe fittings 330 can also be asymmetrically arranged.

[0122] Such as Figure 9 As shown, the shapes of the two heat-conducting pipe fittings 330 are the same. Of course, the shapes of the two heat-conducting pipe fittings 330 can also be different. Therefore, when the number of the heat-conducting pipe fittings 330 is multiple, the shapes of the multiple heat-conducting pipe fittings 330 can be the same, or can be different, or can be partially the same.

[0123] Regarding the shape of the corresponding heat-conducting pipe fitting 330, there is no limitation here. Exemplarily, the heat-conducting pipe fitting 330 can be a continuously bent wavy shape, as Figure 9 shown. Of course, the shape of the heat-conducting pipe fitting 330 can also be similar to the shape of the heat-conducting pipe fitting 330 in Figure 4 or Figure 8 .

[0124] Combined with Figure 7 , and see Figure 9 shown, a part of the heat-conducting pipe fitting 330 corresponds to the first temperature region A, and another part corresponds to the second temperature region B. Of course, the heat-conducting pipe fitting 330 can also correspond to the first temperature region A.

[0125] Such as Figure 9 shown, the number of the micropumps 500 is two. The micropumps 500 are arranged between the two heat-conducting pipe fittings 330. The first ends of the two heat-conducting pipe fittings 330 are connected by one micropump 500, and the second ends of the two heat-conducting pipe fittings 330 are connected by the other micropump 500. Through the two micropumps 500, the heat dissipation medium can be made to circulate in the two heat-conducting pipe fittings 330, and heat balance can be achieved.

[0126] In the above content, the heat dissipation channel 320 is formed by the heat-conducting pipe fitting 330. However, the heat-conducting pipe fitting 330 can also be removed and the heat dissipation channel 320 for accommodating the heat dissipation medium can be formed by using the mirror 310.

[0127] Figure 10This is a schematic diagram of the structure of a fourth reflection unit provided in an embodiment of the present application. Figure 11 for Figure 10 Exploded diagram of the reflection unit in Figure 12 for Figure 11 Schematic diagram of the structure of the lens body.

[0128] Figure 10 and Figure 4 The difference is that the heat conducting pipe 330 is removed and the heat dissipation channel 320 is formed by the reflector 310. Specifically, see Figure 11 As shown, the reflector 310 may include a heat-conducting cover 312 and a lens body 311 having a reflective surface M. The cover 312 is disposed on a side of the lens body 311 away from the reflective surface M and forms a heat dissipation channel 320 for accommodating a heat dissipation medium with the lens body 311. In this way, under the premise of forming the heat dissipation channel 320 for accommodating a heat dissipation medium, the heat transfer path can be further shortened and the thermal resistance can be reduced, which helps to further improve the heat dissipation capacity of the reflector 310.

[0129] There is no limitation on the specific material of the cover 312. In some implementations, the cover 312 may be a polyester substrate (PET film) or a coating such as copper foil.

[0130] In order to improve the fluidity of the heat dissipation medium in the heat dissipation channel 320, in some implementations, the reflection unit 300 may also include a micropump 500 (not shown in the figure), which is arranged inside the reflector 310 and can drive the heat dissipation medium to circulate in the heat dissipation channel 320.

[0131] The heat dissipation channel 320 formed by the cover 312 and the lens body 311 may be one or more, and is not specifically limited here. For example, the cover 312 and the lens body 311 form a plurality of heat dissipation channels 320 arranged side by side, and any two heat dissipation channels 320 are connected.

[0132] There is no limitation on how to enclose the heat dissipation channel 320. In some implementations, such as Figure 12 As shown, a component 3111 may be provided on the side of the lens body 311 facing away from the reflective surface M, and the component 3111 and the cover 312 may enclose a heat dissipation channel 320. In other implementations, the component 3111 may also be provided on the cover 312, and in this case, the surface of the lens body 311 facing away from the reflective surface M and the component 3111 enclose a heat dissipation channel 320.

[0133] Combination Figure 11 and Figure 12It can be seen that a groove for accommodating the constituting portion 3111 is formed on the side of the lens body 311 facing away from the reflecting surface M. The inner wall of the groove, the constituting portion 3111, and the covering member 312 together enclose a plurality of heat dissipation channels 320.

[0134] As Figure 11 shown, the shape of the heat dissipation channel 320 is strip-shaped. Of course, the shape of the heat dissipation channel 320 can also be other shapes, such as similar to Figure 4 the shape of the heat conduction pipe fitting 330 in Figure 9 or the shape of the heat conduction pipe fitting 330 in

[0135] The embodiment of the present application further provides an ultra-short focal length projection lens 10, which includes a lens mount 100, a lens assembly 200, and a reflection unit 300. Among them, the reflection unit 300 and the lens assembly 200 are respectively arranged on the lens mount 100. The lens assembly 200 is used to process the image light beam emitted by the optical engine 30 and generate an imaging light beam directed to the reflection unit 300. The reflection unit 300 is used to reflect the imaging light beam generated by the lens assembly 200 to a set position. The reflection unit 300 includes a reflecting mirror 310, and the reflecting mirror 310 has heat dissipation channels 320 and a heat conduction medium disposed inside the heat dissipation channels 320.

[0136] During the process of the reflection unit 300 reflecting the imaging light beam, the heat conduction medium exchanges heat with the reflecting mirror 310, and can absorb the heat on the reflecting mirror 310 and transfer it to the air. In this way, by providing a heat conduction medium inside the reflection unit 300, the heat conduction performance of the reflecting mirror 310 can be improved, and the phenomenon of excessive heat concentration on the reflecting mirror 310 can be improved. Therefore, the problem that the projection display effect is poor due to the thermal deformation of the reflecting mirror 310 can be improved.

[0137] Among them, the heat conduction medium can be a phase change medium or the heat conduction medium can include nano-scale heat conduction particles and a heat conduction fluid.

[0138] Figure 13 It is a schematic structural diagram of the fourth reflection unit provided by the embodiment of the present application.

[0139] The embodiment of the present application further provides an ultra-short focal length projection lens 10, which includes a lens mount 100, a lens assembly 200, and a reflection unit 300. Among them, the reflection unit 300 and the lens assembly 200 are respectively arranged on the lens mount 100. The lens assembly 200 is used to process the image light beam emitted by the optical engine 30 and generate an imaging light beam directed to the reflection unit 300. The reflection unit 300 is used to reflect the imaging light beam generated by the lens assembly 200 to a set position. The reflection unit 300 includes a reflecting mirror 310 having a reflecting surface M, and the reflecting surface M can reflect the imaging light beam emitted by the lens assembly 200 to a set position. In order to improve the heat conduction of the reflecting mirror 310, as Figure 13As shown, the reflecting unit 300 further has a non-metallic heat-conducting structure 600, and the heat conductivity of the non-metallic heat-conducting structure 600 is greater than or equal to 1.4 W / (m·K). Here, W / (m·K) is watt per (meter·kelvin).

[0140] In this way, due to the good heat-conducting performance of the non-metallic heat-conducting structure 600, the conduction performance of high heat in the mirror 310 can be improved, so as to prevent heat from being too concentrated at one or more positions of the mirror 310. At the same time, the heat exchange amount between the mirror 310 and the air can be increased. Therefore, by improving the conduction performance of heat in the mirror 310 through the non-metallic heat-conducting structure 600, the heat dissipation capacity of the mirror 310 can be improved, and the surface shape of the mirror 310 can be controlled within a reasonable range to ensure good projection display effect.

[0141] There is no limitation on the specific structure of the non-metallic heat-conducting structure 600 here. Among them, the non-metallic heat-conducting structure 600 can be a mesh structure (as Figure 13 shown) or a plate-like structure, etc.

[0142] Such as Figure 13 shown, the non-metallic heat-conducting structure 600 can be arranged outside the mirror 310. In some implementation manners, the non-metallic heat-conducting structure 600 can also be arranged inside the mirror 310.

[0143] There is no limitation on the specific material of the non-metallic heat-conducting structure 600 here. Among them, it is only necessary to meet the requirement that the heat conductivity is greater than or equal to 1.4 W / (m·K). For example, the non-metallic heat-conducting structure 600 can be carbon fiber or graphene.

[0144] In some implementation manners, the projection of the non-metallic heat-conducting structure 600 on the reflecting surface can cover at least part of the first temperature region A. In some other implementation manners, the projection of the non-metallic heat-conducting structure 600 on the reflecting surface can cover at least part of the first temperature region A and at least part of the second temperature region B.

[0145] The application embodiment also provides an ultra-short focus projection lens 10, which includes a lens mount 100, a lens assembly 200 and a reflecting unit 300. Among them, the reflecting unit 300 and the lens assembly 200 are respectively arranged on the lens mount 100. The lens assembly 200 is used for processing the image light beam emitted by the optical engine 30 and generating an imaging light beam that is incident on the reflecting unit 300. The reflecting unit 300 is used for reflecting the imaging light beam generated by the lens assembly 200 to a set position. The reflecting unit 300 includes a mirror 310, and the mirror 310 has a non-metallic part, and the heat conductivity of the non-metallic part is greater than or equal to 1.4 W / (m×K).

[0146] Since the non-metallic part has good heat conduction performance, it can improve the heat conduction performance of high heat in the mirror 310, so as to prevent heat from concentrating too much at one or more positions of the mirror 310. At the same time, it can increase the heat exchange amount between the mirror 310 and the air. Therefore, by improving the heat conduction performance of the non-metallic part in the mirror 310, the heat dissipation ability of the mirror 310 can be improved, and the surface shape of the mirror 310 can be controlled within a reasonable range to ensure good projection display effect.

[0147] Among them, there is no restriction on the specific structure of the non-metallic part. Among them, the non-metallic part can be a mesh structure (as Figure 13 shown) or a plate-like structure, etc.

[0148] There is no restriction on the specific material of the non-metallic part. Among them, it is only necessary for the non-metallic part to meet the requirement that the thermal conductivity is greater than or equal to 1.4 W / (m·K). For example, the non-metallic part can be carbon fiber or graphene.

[0149] Among them, the non-metallic part can be arranged inside or outside the mirror 310, and there is no specific restriction here.

[0150] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0151] For the sake of convenience of explanation, the above description has been made in combination with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. According to the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, so that those skilled in the art can better use the embodiments and various different modified embodiments suitable for specific use considerations.

Claims

1. A ultra-short focus projection lens, characterized in that, include: Mirror mount; A lens assembly, the lens assembly being disposed on the lens holder and used for imaging an incident image beam; and a reflection unit, the reflection unit being arranged on the mirror seat, the reflection unit comprising a reflection mirror having a reflection surface, the reflection surface being used to reflect the imaging light beam emitted by the lens assembly to a set position; The reflection unit further includes a heat dissipation channel and a heat dissipation medium arranged inside the heat dissipation channel.

2. The ultra-short focus projection lens according to claim 1, wherein The reflection unit further comprises a heat-conducting pipe, which is arranged on a side of the reflector away from the reflective surface, and forms a heat-dissipating channel for accommodating the heat-dissipating medium.

3. The ultra-short focus projection lens according to claim 2, characterized in that, A receiving portion is provided on a side of the reflector away from the reflective surface, and the heat-conducting pipe is arranged inside the receiving portion; and / or, A heat-conducting medium is filled between the reflector and the heat-conducting pipe.

4. The ultra-short focus projection lens according to claim 2, wherein The inner wall of the heat-conducting pipe is provided with a microstructure; or, The heat-conducting pipe comprises a pipe body and a graphene heat-dissipating film attached to the inner wall of the pipe body.

5. The ultra-short focus projection lens according to claim 1, wherein The reflector comprises a heat-conducting cover and a lens body having the reflective surface. The cover is arranged on a side of the lens body away from the reflective surface and forms with the lens body the heat dissipation channel for accommodating the heat dissipation medium.

6. The ultra-short focus projection lens according to claim 1, wherein, The reflection unit further includes a micro pump, and the micro pump is used to drive the heat dissipation medium to circulate inside the heat dissipation channel.

7. The ultra-short focus projection lens according to any one of claims 1 to 6, characterized in that, The reflector has a first temperature region and a second temperature region, the optical power density corresponding to the first temperature region is greater than the optical power density of the second temperature region, and the projection of the heat dissipation channel on the reflective surface covers at least part of the first temperature region.

8. The ultra-short focus projection lens according to any one of claims 1 to 6, characterized in that, The heat dissipation medium is a phase change medium or the heat dissipation medium includes nano-scale heat-conducting particles and heat-conducting fluid.

9. A ultra-short focus projection lens, characterized in that, The invention comprises a mirror seat, a lens assembly and a reflection unit. The reflection unit and the lens assembly are respectively arranged on the mirror seat. The reflection unit comprises a reflection mirror. The reflection mirror has a heat dissipation channel and a heat conducting medium arranged inside the heat dissipation channel.

10. A laser projection device, characterized in that, It comprises a laser light source, an optical machine and an ultra-short-throw projection lens as described in any one of claims 1 to 9, wherein the optical machine is used to generate an image beam according to the laser beam provided by the laser light source, and project the image beam to the ultra-short-throw projection lens.

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