Laser beam combining module and laser scanning projection product

Abstract

The utility model discloses a laser beam combining module and a laser scanning projection product, and the laser beam combining module comprises a beam combining mirror seat which comprises a plurality of light source installation surfaces; the laser light sources are respectively arranged on the light source mounting surfaces on different sides of the beam combiner base; the beam combiner is arranged in the beam combiner base and is used for combining the light rays emitted by the plurality of laser light sources into combined laser beams emitted towards a target direction; and the heat dissipation device is arranged on the outer side of the beam combiner base and comprises a part in heat conduction connection with each laser light source and a part in heat conduction connection with the beam combiner base. The heat dissipation device can timely conduct heat of the laser light sources to the outer side of the beam combining mirror base to be dissipated, so that the arrangement compactness of the laser light sources is not limited by the heat productivity of the light sources any more, the overall structure of the laser beam combining module is more compact, and the combined light beam power can be effectively improved.

Description

Technical Field

[0001] The present application relates to the field of projection display technology, and in particular to a laser beam combining module and a laser scanning projection product. Background Art

[0002] Laser beam combining can improve beam quality, increase output power, and improve power density, and can meet the needs of many applications that require high output power and power density of the beam.

[0003] However, in the known laser beam combining technology, the spacing between the multiple laser light emitting units that need to be combined needs to take into account the influence of heat generation and cannot be too close, which may cause gaps in the final output combined beam and also sacrifice some power density. Utility Model Content

[0004] In order to solve the existing technical problems, the present application provides a laser beam combining module and a laser scanning projection product with a compact overall structure and improved combined beam power.

[0005] In a first aspect of an embodiment of the present application, a laser beam combining module is provided, comprising:

[0006] A beam combining mirror seat, comprising a plurality of light source mounting surfaces;

[0007] Laser light sources are disposed on the light source mounting surfaces on different sides of the beam combining mirror seat;

[0008] A beam combiner, disposed in the beam combining mirror seat, for combining the light emitted by the plurality of laser light sources into a combined laser beam emitted in a target direction;

[0009] The heat dissipation device is arranged on the outer side of the beam combining mirror seat, and comprises a part connected to each of the laser light sources by thermal conduction and a part connected to the beam combining mirror seat by thermal conduction.

[0010] In a second aspect, a laser scanning projection product is provided, comprising the laser beam combining module described in any embodiment of the present application;

[0011] A galvanometer scanning assembly, comprising a first galvanometer and a second galvanometer arranged at a set angle to the first galvanometer, wherein the first galvanometer uses the combined laser beam as incident light, performs scanning in a first dimension direction and reflects the combined laser beam toward the second galvanometer, and the second galvanometer uses the combined laser beam reflected by the first galvanometer as incident light, performs scanning in a second dimension direction and reflects the combined laser beam and emits it in the direction of a target projection surface;

[0012] The beam expansion component is arranged on the outgoing light path of the second galvanometer, and is used to expand the outgoing light of the galvanometer scanning component by a preset multiple to form the target projection surface.

[0013] In the above embodiment, the beam combining mirror seat is provided with a light source mounting surface for respectively assembling a plurality of laser light sources, and the beam combiner is arranged in the beam combining mirror seat. The relative spacing between the plurality of laser light sources can be preset through the light source mounting surface, and the laser direction of each laser light source incident on the beam combiner can be preset. The heat dissipation device includes a portion thermally connected to each laser light source and a portion thermally connected to the beam combining mirror seat, which can timely conduct the heat of each laser light source to the outside of the beam combining mirror seat for dissipation, so that the arrangement density of each laser light source is no longer limited by the influence of the heat generated by the light source, so that the overall structure of the laser beam combining module is more compact and the combined light beam power can be effectively improved.

[0014] In the above embodiments, the laser scanning projection product and the corresponding laser beam combining module embodiments belong to the same concept, and thus have the same technical effects as the corresponding laser beam combining module embodiments, which will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the structure in which a laser beam combining module is installed on a primary mirror mount in one embodiment.

[0016] Figure 2 Schematic diagram of the structure of the laser beam combining module and the primary mirror mount in a disassembled state in one embodiment.

[0017] Figure 3 FIG. 4 is a schematic diagram of a laser beam combining module from another angle in an embodiment.

[0018] Figure 4 Schematic diagram of the structure of the laser beam combining module and the primary mirror mount of the optical system in another embodiment in an assembled state.

[0019] Figure 5 for Figure 4 Schematic diagram of the structure of the second heat conducting block.

[0020] Figure 6 Schematic diagram of the structure of the laser beam combining module and the primary mirror mount of the optical system in an assembled state in another embodiment.

[0021] Figure 7 for Figure 6 Schematic diagram of the structure of the integral heat conduction block.

[0022] Figure 8 Schematic diagram of the optical path of a laser beam combining module in one embodiment.

[0023] Fig. 9 FIG. 4 is a schematic diagram of the optical path of a laser beam combining module in another embodiment.

[0024] Fig.10 FIG. 4 is a schematic diagram of the optical path of a laser beam combining module in another embodiment.

[0025] Fig.11 The figure is a schematic diagram of the optical path for realizing wavelength beam combining by using a separate dichroic mirror and a polarization beam combiner in one embodiment.

[0026] Fig.12 Schematic diagram of the structure of a laser scanning projection product in one embodiment.

[0027] Fig.13 for Fig.12 Exploded schematic diagram of the laser scanning projection product shown.

[0028] Component Symbols:

[0029] 10 laser beam combining module, 11 laser light source, 112 laser seat, 12 beam combiner, 13 beam combining mirror seat, 131 connector end, 132 connecting column, 15 first heat conducting block, 16 second heat conducting block, 161 heat sink, 18 overall heat conducting block, 181 heat conducting part, 182 heat dissipation part, 20 galvanometer scanning assembly, 21 first galvanometer, 22 second galvanometer, 23 main mirror seat, 30 beam expansion assembly, 32 negative lens, 40 housing, 41 main housing, 42 wiring channel, 43 side panel, 45 light outlet, 47 circuit board, 471 plug-in connector DETAILED DESCRIPTION

[0030] The technical solution of the utility model is further elaborated in detail below in conjunction with the accompanying drawings and specific embodiments of the specification.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the implementation of the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0032] In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0033] It should be noted that in the following description, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0034] In the following description, the expression "some embodiments" is involved, which describes a subset of all possible embodiments. It should be noted that "some embodiments" may be the same subset or different subsets of all possible embodiments, and may be combined with each other without conflict.

[0035] In the following description, the terms "first, second, third" are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It is understandable that "first, second, third" can be interchanged with a specific order or sequence where permitted, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0036] Please refer to Figures 1 to 3 , a laser beam combining module 10 provided in one embodiment of the present application, includes a beam combining mirror seat 13, including multiple light source mounting surfaces; laser light sources 11, which are arranged on the light source mounting surfaces on different sides of the beam combining mirror seat 13; a beam combiner 12, which is arranged in the beam combining mirror seat 13 and is used to combine the light emitted by the multiple laser light sources 11 into a combined laser beam emitted in a target direction; a heat dissipation device, which is arranged on the outer side of the beam combining mirror seat 13, including a part that is thermally connected to each laser light source 11 and a part that is thermally connected to the beam combining mirror seat 13.

[0037] Among them, the beam combiner 12 can be a lens assembly including an inclined light combining surface, and the light combining surface can be provided with a semi-transparent and semi-reflective film for transmitting and reflecting the light incident from the laser light sources 11 on different sides. The reflected light can overlap with the transmitted light and be emitted along the same optical path, thereby realizing the beam combining of the incident light from the laser light sources 11 on different sides and achieving a higher brightness combined laser.

[0038] In the above embodiment, the beam combiner seat 13 is provided with a light source mounting surface for respectively assembling a plurality of laser light sources 11, and the beam combiner 12 is arranged in the beam combiner seat 13. The relative spacing between the plurality of laser light sources 11 can be preset through the light source mounting surface, and the laser direction of each laser light source 11 incident on the beam combiner 12 can be preset. The heat dissipation device includes a portion thermally connected to each laser light source 11 and a portion thermally connected to the beam combiner seat 13, which can timely conduct the heat of each laser light source 11 to the outside of the beam combiner seat 13 for dissipation, so that the arrangement density of each laser light source 11 is no longer limited by the influence of the heat generated by the light source, so that the overall structure of the laser beam combining module 10 is more compact and the combined light beam power can be effectively improved.

[0039] In some embodiments, the beam combiner seat 13 includes a joint end 131 and a plurality of connecting posts 132 extending vertically outward from the joint end 131, two adjacent connecting posts 132 define a light source installation surface, and a mounting port for installing the corresponding laser light source 11 is formed between the corresponding connecting posts 132. The joint end 131 is in the shape of a rectangular plate, and the plurality of connecting posts 132 are respectively located at the corners of the joint end 131, so that the overall outer contour of the beam combiner seat 13 is roughly in the shape of a rectangular parallelepiped. In this way, the plane where the two adjacent connecting posts 132 are located can be regarded as the light source installation surface.

[0040] Optionally, one side of the connector end 131 is an assembly surface, which is used to assemble the laser beam combining module 10 to the target position, such as assembling the laser beam combining module 10 to the main mirror mount 23 of a laser scanning projection product that uses the laser beam combining module 10. The side corresponding to the assembly surface can also be set as a connecting wall extending vertically outward from the connector end 131, and the connecting column 132 is only formed at two corner positions on the side opposite to the connecting wall. In this way, installation ports for assembling the laser light source 11 are defined between adjacent connecting columns 132 and between each connecting column 132 and the connecting wall. It should be noted that a through hole is provided on the connecting wall for emitting the combined laser beam, and the parts of the connecting wall on the opposite sides of the through hole can be regarded as the connecting columns 132 located at the corner positions of the connector end 131.

[0041] In some embodiments, each laser light source 11 includes a laser seat 112, and the size of the laser seat 112 corresponds to the mounting opening. The size of the mounting opening on each light source mounting surface corresponds to the size of the laser seat 112 of the corresponding laser light source 11, so that the laser seat 112 can be embedded in the corresponding mounting opening and installed on the corresponding side of the beam combiner seat 13. The laser can be installed in the corresponding laser seat 112 as a light source. By assembling the laser seat 112 and the beam combiner seat 13, the position and direction of the laser can be limited, which is equivalent to pre-designing the relative position between the light emitted by each laser and the beam combiner 12 stored in the beam combiner seat 13, so as to ensure the accuracy of the optical path for combining the light of the multiple laser light sources 11.

[0042] Optionally, the heat dissipation device includes a first heat conductive block 15 which is arranged one by one corresponding to each laser light source 11, and the first heat conductive block 15 includes a heat conductive surface which is respectively attached to the end surface of the laser seat 112 and a heat conductive surface which is attached to the surface of the beam combining mirror seat 13. Each laser seat 112 is provided with a first heat conductive block 15 on the end surface close to the joint end 131, so as to fully utilize the idle space between the laser beam combining module 10 and the main mirror seat 23 after the two are assembled to achieve the purpose of heat dissipation. In this embodiment, the first heat conductive block 15 is L-shaped. The L-shaped first heat conductive block 15 can reduce weight and material cost while providing large contact areas with the laser seat 112 and the beam combining mirror seat 13 respectively, and both the heat conductive area and the heat dissipation area can be increased, thereby improving the heat dissipation effect of the laser.

[0043] Optionally, the end of the beam combining mirror seat 13 opposite to the joint end 131 is an open end, and the heat dissipation device also includes a second heat conducting block 16 plugged into the open end. The second heat conducting block 16 includes a heat sink body and a plug-in portion protruding from one side of the heat sink body, the plug-in portion protruding into the beam combining mirror seat 13 through the open end and its end face is attached to each laser seat 112. Among them, the second heat conducting block 16 includes a plug-in portion that matches the shape of the open end of the beam combining mirror seat 13, and can be assembled by engaging the plug-in portion with the open end. The main body of the second heat conducting block 16 is a rectangular heat sink block design, which transfers the heat of the laser beam combining module 10 to the main mirror seat 23 while also having good heat dissipation capacity, thereby improving the heat dissipation effect on the laser. It should be noted that the heat sink body of the second heat conducting block 16 can use the space on one side of the open end of the beam combining mirror seat 13 to increase its size, which can further improve the heat dissipation capacity of the heat dissipation device for the floating heat of multiple laser light sources 11.

[0044] Optionally, the heat dissipation device further includes another second heat conducting block 16 disposed at the joint end 131, and each second heat conducting block 16 includes a heat conducting surface attached to the surface of the beam combining mirror seat 13 and a heat conducting surface attached to the surface of the primary mirror seat 23. The second heat conducting blocks 16 are respectively installed at opposite ends of the beam combining mirror seat 13, so as to further improve the heat dissipation performance of the laser beam combining module 10.

[0045] Among them, the laser seat 112 is provided with a mounting port that matches the shape of the corresponding laser, and thermal conductive silicon or graphene can be coated between the laser and the laser seat 112 to conduct the heat of the laser to the laser seat 112 well. The material of the first heat-conducting block 15 may include but is not limited to copper, brass, aluminum alloy, etc. The first heat-conducting block 15 has a heat-conducting surface that is respectively in contact with the laser seat 112 and the beam-combining mirror seat 13, and the heat-conducting surface can be coated with thermal conductive silicon or graphene to better conduct the heat of the laser to the beam-combining mirror seat 13. The material of the second heat-conducting block 16 includes but is not limited to copper, brass, aluminum alloy, etc. The second heat-conducting block 16 has a heat-conducting surface that is respectively in contact with the beam-combining mirror seat 13 and the main mirror seat 23. Similarly, the heat-conducting surface of the second heat-conducting block 16 can be coated with thermal conductive silicon or graphene to better conduct the heat of the beam-combining mirror seat 13 and the laser to the main mirror seat 23. In this way, the overall heat dissipation effect of the laser beam combining module 10 can be improved.

[0046] It should be noted that the first heat conducting block 15 and the second heat conducting block 16 are provided with heat conducting surfaces in contact with the laser light source, the beam combining mirror seat 13 and the primary mirror seat 23 to respectively conduct the heat of each laser light source to the beam combining mirror seat 13 and the primary mirror seat 23, and the implementation scheme is not limited to the methods in the above-mentioned embodiments. For example, the second heat conducting block 16 may be machined with some grooves on the surface, or the plug-in portion of the second heat conducting block may be formed into different shapes, or the first heat conducting block 15 and the second heat conducting block 16 may be formed into an integral structural member. In some embodiments, please refer to Figure 4 and Figure 5 The outer side of the second heat conducting block 16 is provided with a plurality of heat dissipating fins 161 which are spaced apart from each other and parallel to each other, and an air flow channel is formed between adjacent heat dissipating fins, so as to increase the heat dissipation area of ​​the second heat conducting block 16. In other embodiments, please refer to Figure 6 and Figure 7The first heat-conducting block 15 and the second heat-conducting block 16 form an integral heat-conducting block 18, which includes a heat-conducting portion 181 and a heat-dissipating portion 182. The two integral heat-conducting blocks 18 are respectively arranged at the joint end 131 and the open end of the beam-combining mirror seat 13. The heat-conducting portion 181 of the integral heat-conducting block 18 installed at the joint end 131 is inserted into the mounting port on the top surface of the beam-combining mirror seat 13, and the partial surface on the side away from the heat-dissipating portion 182 is connected to each laser seat 112 by thermal conduction. The heat-conducting portion 181 of the other integral heat-conducting block 18 is inserted into the bottom of the open end of the beam-combining mirror seat 13. The heat-dissipating portion 182 is formed with a plurality of mutually spaced and parallel heat-dissipating fins on the side away from the heat-conducting portion 181, and an air flow channel is formed between adjacent heat-dissipating fins, which can increase the heat-dissipating area of ​​the integral heat-conducting block 18. The design of the integral heat-conducting block 18 reduces the joint surface in the heat-conducting path from the laser seat 112 to the primary mirror seat 23, which can reduce thermal resistance and improve heat-dissipating efficiency.

[0047] Among them, the laser light source 11 can be one of the following: the laser light source 11 includes an S-light polarized light source and a P-light polarized light source respectively arranged on different sides of the beam combiner 12; the laser light source 11 includes a first P-light polarized light source, a second P-light polarized light source and a half-wave plate located between the second P-light polarized light source and the beam combiner 12 respectively arranged on different sides of the beam combiner 12; the laser light source 11 includes a red laser source, a green laser source and a blue laser source respectively arranged on different sides of the beam combiner 12. Optionally, before the laser light source 11 emits a laser beam and is incident on the beam combiner 12, it also includes collimating the laser beam so that the slow axis divergence rate of a single laser beam can match the fast axis divergence rate. In an optional example, each of the laser light sources 11 is configured as a light source device with a collimating lens integrated therein. In another optional example, the laser beam combining module 10 also includes a collimating lens arranged in the optical path of each laser light source 11 incident on the beam combiner 12. The laser beam combining module 10 may adopt a beam combining polarization solution or a color beam combining solution, both of which may achieve the purpose of combining multiple laser light sources 11 to enhance brightness, and this application does not impose any limitation on this.

[0048] In some embodiments, the laser beam combining module 10 adopts a monochromatic light beam combining polarization solution, see Figure 8 In an optional specific example, the beam combiner 12 is a light combining lens assembly including an inclined light combining surface, the S light polarized light source and the P light polarized light source are respectively arranged on both sides of the light combining lens assembly, and the light combining surface transmits the P light and reflects the S light, and the S light is emitted after being reflected and coincides with the P light to achieve the combination of the P light and the S light to obtain higher brightness. At this time, the P light and the S light are two orthogonal ellipses that overlap, which can be applied to the application scenario requirements that need to fit to form a perfect circular projection surface. Please refer to Fig. 9In another optional specific example, a P-light polarized light source and a P-light polarized light source are respectively arranged on both sides of the light-combining lens assembly through a half-wave plate. The half-wave plate converts the P-light into S-light and reaches the light-combining surface. The light-combining surface transmits the P-light and reflects the S-light. After the S-light is reflected, it coincides with the P-light and is emitted along the same optical path as the P-light, thereby realizing the combination of the P-light and the S-light to obtain higher brightness. At this time, the P-light and the S-light are two overlapping ellipses, which is conducive to obtaining better beam quality.

[0049] In other embodiments, the laser beam combining module 10 adopts a color beam combining solution, and a red laser source, a green laser source, and a blue laser source are respectively arranged on three sides of the beam combiner 12. Fig.10 , R\G\B represent red, green, and blue respectively. Lasers of the same color use polarization beam combining, and lasers of different colors are then combined by cubic wavelength through the dichroic mirror in the middle. The dichroic mirror and polarization beam combiner 12 can be discrete devices or integrated prisms through optical bonding. Please refer to Fig.11 By using a discrete long-wavelength dichroic mirror (long wavelength transmission, short wavelength reflection) to achieve wavelength combination, high-brightness color display can be achieved.

[0050] See also Fig.12 On the other hand, the embodiments of the present application further provide a laser scanning projection product, including the laser beam combining module 10 of any of the aforementioned embodiments; a galvanometer scanning assembly 20, including a first galvanometer 21 and a second galvanometer 22 inclined at a set angle to the first galvanometer 21, the first galvanometer 21 uses the combined laser as incident light, performs scanning in a first dimension direction and reflects the combined laser to the second galvanometer 22, the second galvanometer 22 uses the combined laser reflected by the first galvanometer 21 as incident light, performs scanning in a second dimension direction and reflects the combined laser to emit in the direction of a target projection surface; a beam expansion assembly 30, arranged on the output light path of the second galvanometer 22, for expanding the output light of the galvanometer scanning assembly 20 by a preset multiple to form a target projection surface.

[0051] Among them, the first galvanometer 21 and the second galvanometer 22 are tilted at a set angle, which can be determined by the direction of the combined laser emitted by the laser beam combining module 10 and the direction of the output light path that needs to be emitted after final reflection by the second galvanometer 22. Specifically, the incident surface of the first galvanometer 21 faces the output direction of the combined laser, and the incident surface of the second galvanometer 22 faces the first galvanometer 21 to perform a first-dimensional direction scan and reflect the output direction of the combined laser after reflection, and the second galvanometer 22 performs a second-dimensional direction scan according to the combined laser reflected by the first galvanometer 21 and finally reflects the combined laser toward the beam expansion component 30, which is expanded and amplified by the beam expansion component 30 and then emitted toward the projection surface. In this way, the relative positions and angle relationships among the laser beam combining module 10, the first galvanometer 21, the second galvanometer 22 and the beam expansion component 30 can be adjusted based on the formation of this light path.

[0052] In the above embodiment, the laser scanning projection product includes a laser beam combining module 10, a galvanometer scanning assembly 20 and a beam expansion assembly 30. The laser beam combining module 10 includes a beam combiner 12 for combining light emitted by multiple laser light sources 11 to form a combined laser beam. The combined laser beam is incident on the galvanometer scanning assembly 20, and sequentially passes through the first galvanometer 21, the second galvanometer 22 and the beam expansion assembly 30. The first galvanometer 21 and the second galvanometer 22 are used to respectively implement first-dimensional scanning and second-dimensional scanning. By controlling the laser light source 11 and the galvanometer, any customized image dynamic display and flexible adjustment of the resolution can be achieved. The beam expansion assembly 30 is used to achieve a preset multiple of the scanned image to obtain a projection image with a large field of view. In this way, by combining multiple laser light sources 11, combining two-dimensional galvanometer scanning and the multiple of the angle expansion, the problem of mutual constraints between illumination and projection area, and between projection distance and projection area can be solved, and the projection purpose of high brightness and large field of view can be achieved under the premise of compact overall structure, small size and low cost.

[0053] In some embodiments, please refer to Fig.12 and Fig.13The laser scanning projection product also includes a housing 40 that integrates the laser beam combining module 10, the galvanometer scanning assembly 20, and the beam expanding assembly 30. The housing 40 includes a main housing 41 and a side panel 43 that is detachably connected to the main housing 41; the main housing 41 and the side panel 43 together define a storage space that accommodates the laser beam combining module 10, the vibration scanning assembly, and the beam expanding assembly 30; a light outlet 45 is provided on the side of the main housing 41 at a position corresponding to the beam expanding assembly 30. The main housing 41 is a hollow rectangle, and the side panel 43 and the main housing 41 can be connected by a known detachable connection structure such as a fixing, a snap, etc., so that the side panel 43 can be quickly disassembled when needed to provide an opening for inspection of the components located in the main housing 41. The light outlet 45 is the final outlet of the optical path of the laser scanning projection product. The beam expansion assembly 30 includes a positive lens (not shown) and a negative lens 32 arranged in sequence on the final output optical path of the laser scanning projection product. Therefore, the position and size of the light outlet 45 can be set according to the negative lens 32 in the beam expansion assembly 30. In this embodiment, the outer contour of the positive lens is rectangular, and the outer contour of the negative lens 32 is circular. The shape and size of the light outlet 45 are the same as those of the negative lens 32. When the laser scanning projection product is installed in the main shell 41, the negative lens 32 is embedded in the light outlet 45, and its outer side is kept flush with the outer surface of the main shell 41.

[0054] Optionally, the laser scanning projection product further includes a circuit board 47 stored in the storage space and arranged near the side panel 43, and the bottom surface of the main housing 41 is provided with a wiring channel 42 for the wire to pass through at a position corresponding to the circuit board 47. The circuit board 47 is arranged on one side of the main housing 41 near the side panel 43, which saves space, is convenient for assembly, and can be easily repaired by removing the side panel 43. The electric control circuits and components of each component in the laser scanning projection product can be integrated on the circuit board 47. In this embodiment, the circuit control board of each laser light source 11 of the laser beam combining module 10, the drive circuit control board of each galvanometer in the galvanometer scanning assembly 20, and the control circuit in the beam expansion assembly 30 to eliminate the distortion generated during the angle expansion lens expansion process are all integrated on the circuit board 47. The circuit board 47 can be connected to the electric control system outside the main housing 41, such as the FPGA motherboard with more powerful computing power, by passing the wire through the wiring channel 42. It is understandable that a plug-in connector 471 may be provided at a position on the circuit board 47 corresponding to the wiring channel 42, so that the external wiring of the laser scanning projection product can be more simple and convenient to operate.

[0055] It should be noted that the laser scanning projection product referred to in the embodiments of the present application can be various portable projection products that require small size, high brightness, and large field of view, including but not limited to vehicle-mounted head-up reality (HUD), various portable projectors, holographic imaging helmets, AR glasses, etc., without limitation here.

[0056] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A laser beam combining module, It is characterized in that include: A beam combining mirror seat, comprising a plurality of light source mounting surfaces; Laser light sources are arranged on the light source mounting surfaces on different sides of the beam combining mirror seat, and each of the laser light sources includes a laser seat; A beam combiner, disposed in the beam combining mirror seat, for combining the light emitted by the plurality of laser light sources into a combined laser beam emitted in a target direction; A heat dissipation device is arranged on the outside of the beam-combining mirror seat, including a part thermally connected to each of the laser light sources and a part thermally connected to the beam-combining mirror seat, wherein the heat dissipation device includes a first heat-conducting block arranged one-to-one corresponding to each of the laser light sources, and the first heat-conducting block includes a heat-conducting surface respectively attached to the end face of the laser seat and a heat-conducting surface attached to the surface of the beam-combining mirror seat.

2. The laser beam combining module according to claim 1, It is characterized in that The beam combining mirror seat includes a joint end and a plurality of connecting columns extending vertically outward from the joint end. Two adjacent connecting columns define a light source mounting surface, and a mounting opening for mounting the corresponding laser light source is formed between the corresponding connecting columns.

3. The laser beam combining module according to claim 2, It is characterized in that The size of the laser seat corresponds to the installation opening.

4. The laser beam combining module according to claim 3, It is characterized in that The first heat conducting block is L-shaped.

5. The laser beam combining module according to claim 3, It is characterized in that The end of the beam combining mirror seat opposite to the joint end is an open end, and the heat dissipation device includes a second heat conducting block plugged and connected to the open end.

6. The laser beam combining module according to claim 5, It is characterized in that The second heat conducting block comprises a heat sink body and an inserting portion protruding from one side of the heat sink body. The inserting portion protrudes into the beam combining mirror seat through the opening end and its end surface is attached to each of the laser seats.

7. The laser beam combining module according to claim 5, It is characterized in that A plurality of parallel and spaced heat sinks are disposed on the outer side of the second heat conducting block; or, The second heat-conducting block includes a heat-conducting portion and a heat-dissipating portion. The heat-conducting portion is thermally connected to the laser seats of each of the laser light sources respectively. A plurality of parallel and spaced heat-dissipating fins are arranged on the outer side of the heat-dissipating portion.

8. The laser beam combining module according to claim 6 or 7, It is characterized in that The heat dissipation device also includes another second heat conducting block provided at the joint end; Each of the second heat-conducting blocks includes a heat-conducting surface attached to the surface of the beam-combining mirror seat and a heat-conducting surface attached to the surface of the main mirror seat for assembling the laser beam-combining module.

9. The laser beam combining module according to claim 4, 6 or 7, It is characterized in that The heat-conducting surfaces are coated with heat-conducting silicon or graphene respectively.

10. A laser scanning projection product, It is characterized in that include: The laser beam combining module according to any one of claims 1 to 9; A galvanometer scanning assembly, comprising a first galvanometer and a second galvanometer arranged at a set angle to the first galvanometer, wherein the first galvanometer uses the combined laser beam as incident light, performs scanning in a first dimension direction and reflects the combined laser beam toward the second galvanometer, and the second galvanometer uses the combined laser beam reflected by the first galvanometer as incident light, performs scanning in a second dimension direction and reflects the combined laser beam and emits it in the direction of a target projection surface; The beam expansion component is arranged on the outgoing light path of the second galvanometer, and is used to expand the outgoing light of the galvanometer scanning component by a preset multiple to form the target projection surface.

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