Laser scanning projection product and optical system thereof

Abstract

The utility model discloses a laser scanning projection product and an optical system thereof, the optical system comprises a beam combining assembly, the beam combining assembly comprises a plurality of laser light sources and a beam combiner, and the beam combiner combines light emitted by the plurality of laser light sources into combined laser emitted towards a target direction; the galvanometer scanning assembly comprises a first galvanometer and a second galvanometer, the second galvanometer and the first galvanometer are obliquely arranged at a set angle, the first galvanometer takes the combined laser as incident light, executes first-dimensional direction scanning and reflects the combined laser to the second galvanometer, and the second galvanometer takes the combined laser reflected by the first galvanometer as incident light and reflects the combined laser to the second galvanometer; second-dimensional direction scanning is executed, and the combined laser is reflected and then is emitted to the direction of the target projection surface; and the beam expanding assembly is arranged on the emergent light path of the second galvanometer, comprises a positive lens and a negative lens which are sequentially arranged along the emergent light path, and is used for expanding the emergent light of the galvanometer scanning assembly by a preset multiple to form a target projection surface, so that the projection purposes of small overall size, high brightness and large field angle are achieved.

Description

Technical Field

[0001] The present application relates to the field of projection display technology, and in particular to a laser scanning projection product and an optical system thereof. Background Art

[0002] Laser beam scanning (LBS) has the characteristics of relatively strong energy, good monochromaticity and good collimation, and is widely used in industrial processing, projection display, ranging and other fields. Micro-projection products based on LBS technology can easily project visual files stored in small portable electronic devices such as smart phones, tablets, laptops, etc. onto walls or other larger surfaces, thus being increasingly widely used in the field of projection products, such as in-vehicle head-up reality (HUD, head-up display system), various portable projectors, holographic imaging helmets, AR glasses, etc.

[0003] However, these micro-projection products have high requirements for the compactness, small size and low cost of the overall structure of the product. The inventors of this application found in their research that the lens structure of the currently known portable projection products is complex, and it is often difficult to take into account the requirements of volume and performance at the same time, especially for the requirements of high-brightness projection, there are mutual constraints between illumination and projection area, and between projection distance and projection area, while MEMS (Mirco-electro-mechanical-systems) galvanometers, which are manufactured based on semiconductor processes, can integrate real-time angle feedback measurement units, can reflect the incident laser according to a certain trajectory and control the direction of the outgoing light beam to achieve fixed-point projection or scanning projection, can be combined with micro-projection products, avoid the need for focusing for projection work, can achieve projection display at any working distance, and can provide a basis for combining it with other optical modules to solve the problem of mutual constraints between illumination and projection area, and between projection distance and projection area. Utility Model Content

[0004] In order to solve the existing technical problems, the present application provides a laser scanning projection product and its optical system that can take into account the requirements of volume and performance and can achieve the purpose of high brightness and large field of view projection.

[0005] In a first aspect of an embodiment of the present application, an optical system is provided, comprising:

[0006] A beam combining component, comprising a plurality of laser light sources and a beam combiner, wherein the beam combiner combines the light emitted by the plurality of laser light sources into a combined laser beam emitted in a target direction;

[0007] 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;

[0008] The beam expansion component is arranged on the outgoing light path of the second galvanometer, and includes a positive lens and a negative lens arranged in sequence along the outgoing light path, and is used to expand the outgoing light of the galvanometer scanning component by a preset multiple to form the target projection surface.

[0009] In a second aspect, a laser scanning projection product is provided, comprising a mainboard and an optical machine, wherein the optical machine is electrically connected to the mainboard via a wire connector, and the optical machine comprises the optical system described in any embodiment of the present application.

[0010] In the above embodiment, the optical system includes a beam combining component, a galvanometer scanning component and a beam expansion component. The beam combining component includes a beam combiner that combines light emitted by multiple laser light sources to form a combined laser beam. The combined laser beam is incident on the galvanometer scanning component, and sequentially passes through the first galvanometer, the second galvanometer and the beam expansion component. The first galvanometer and the second galvanometer are used to respectively realize first-dimensional scanning and second-dimensional scanning. By controlling the laser light source and the galvanometer, any customized image dynamic display and flexible adjustment of the resolution can be realized. Then, the positive lens and the negative lens of the beam expansion component are combined to realize a preset multiple of angle expansion, so as to realize a projection screen with a large field of view. In this way, through the combination of multiple laser light source beam combining, two-dimensional galvanometer scanning and angle expansion multiples, the problem of mutual constraints between illumination and projection area, and between projection distance and projection area can be solved, so as to achieve the projection purpose of high brightness and large field of view under the premise of compact overall structure, small size and low cost.

[0011] In the above embodiments, the laser scanning projection product and the corresponding optical system embodiments belong to the same concept, and thus have the same technical effects as the corresponding optical system embodiments, which will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 FIG. 4 is a schematic diagram of the optical path of an optical system in an embodiment.

[0013] Figure 2 Schematic diagram of the principle of the optical path of the optical system in one embodiment.

[0014] Figure 3 Schematic diagram of the structure of an optical system in one embodiment.

[0015] Figure 4Schematic diagram of the structure of the main mirror mount and beam expansion assembly of the optical system in one embodiment.

[0016] Figure 5 for Figure 4 Another angle schematic diagram of the primary mirror mount and beam expansion assembly is shown in .

[0017] Figure 6 for Figure 4 Another angle schematic diagram of the primary mirror mount and beam expansion assembly is shown in .

[0018] Figure 7 Schematic diagram of the structure of a beam expansion assembly in one embodiment.

[0019] Figure 8 Schematic diagram of the optical path of a beam combining component in one embodiment.

[0020] Fig. 9 FIG. 4 is a schematic diagram of the optical path of a beam combining component in another embodiment.

[0021] Fig.10 Schematic diagram of the optical path of a beam combining component in another embodiment.

[0022] 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.

[0023] Fig.12 It is a schematic diagram of the structure of the main mirror mount and the beam combining assembly of the optical system in an exploded state in one embodiment.

[0024] Fig.13 for Fig.12 The schematic diagram of the structure of the primary mirror mount and the beam combining assembly in the assembled state is shown.

[0025] Fig.14 It is a schematic structural diagram of the main mirror mount and beam combining assembly of the optical system in another embodiment in the assembled state.

[0026] Fig.15 for Fig.14 Schematic diagram of the structure of the second heat conducting block.

[0027] Fig.16 It is a schematic structural diagram of the main mirror mount and beam combining assembly of the optical system in another embodiment in the assembled state.

[0028] Fig.17 for Fig.16 Schematic diagram of the structure of the integral heat conduction block.

[0029] Fig.18 It is a schematic structural diagram of the main mirror base and the galvanometer scanning assembly in an assembled state in one embodiment.

[0030] Fig.19 for Fig.18 Another angle schematic diagram of the main mirror base and the galvanometer scanning assembly is shown.

[0031] Fig. 20 for Fig.18 The structure diagram of the main mirror base and the galvanometer scanning assembly in the disassembled state is shown.

[0032] Fig.21 Schematic diagram of the exploded structure of an optical system in one embodiment.

[0033] Fig. 22 It is a schematic diagram of the structure of the optical system without the outer shell in one embodiment.

[0034] Component Symbols:

[0035] 10 beam combining assembly, 11 laser light source, 112 laser seat, 12 beam combiner, 13 beam combining mirror seat, 131 joint 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, 24 first galvanometer mounting position, 25 second galvanometer mounting position, 231 mirror seat body, 232 first lens Mounting position, 233 second lens mounting position, 2331 support plate, 2332 support column, 2333 barb, 235 mounting arm, 251 stop surface, 252 inclined mounting surface, 236 end arm, 237 light window, 240 guide groove, 242 slide groove, 243 guide convex strip, 30 beam expansion assembly, 31 positive lens, 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

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] See also Figures 1 to 3 , an optical system provided in an embodiment of the present application, includes a beam combining component 10, including multiple laser light sources 11 and a beam combiner 12, the beam combiner 12 combines the light emitted by the multiple laser light sources 11 into a combined laser beam emitted in a target direction; a galvanometer scanning component 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 takes the combined laser beam as incident light, performs scanning in a first dimension direction and reflects the combined laser beam to the second galvanometer 22, the second galvanometer 22 takes the combined laser beam reflected by the first galvanometer 21 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; a beam expansion component 30, arranged on the output light path of the second galvanometer 22, and used to expand the output light of the galvanometer scanning component 20 by a preset multiple to form a target projection surface.

[0043] 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 beam combining component 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, 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 beam combining component 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.

[0044] 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.

[0045] In the above embodiment, the optical system includes a beam combining component 10, a galvanometer scanning component 20 and a beam expanding component 30. The beam combining component 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 component 20, and sequentially passes through the first galvanometer 21, the second galvanometer 22 and the beam expanding component 30. The first galvanometer 21 and the second galvanometer 22 are used to respectively implement scanning in the first dimensional direction and scanning in the second dimensional direction. 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 scanned image is then expanded by a preset multiple through the beam expanding component 30 to obtain a projection image with a large field of view. In this way, by combining multiple laser light sources 11, two-dimensional galvanometer scanning and the expansion multiple, 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. It should be noted that, in the present embodiment, the optical system utilizes light source beam combining and two galvanometer mirrors to realize a combination of scanning and angle expansion in two dimensions to achieve the purpose of high brightness and large field of view projection. It is particularly suitable for some specific application scenarios where a projection image with a large field of view still needs to be obtained under close distance conditions.

[0046] In some embodiments, please refer to Figures 4 to 6The galvanometer scanning assembly 20 also includes a main mirror seat 23, which includes a seat body 231 and a beam expansion mounting portion provided on the seat body 231; the beam expansion lens includes a positive lens 31 and a negative lens 32 arranged in sequence along the outgoing light path, and the beam expansion mounting portion includes a first lens mounting position 232 for the negative lens 32 to be mounted correspondingly and a second lens mounting position 233 for the positive lens 31 to be mounted correspondingly. Among them, the main mirror seat 23 is the main component in the optical system, that is, the basic bearing structure of the beam combining assembly 10, the galvanometer scanning assembly 20 and the beam expansion assembly 30, which is conducive to the overall simplification and compactness of the optical system, and is also conducive to ensuring the overall performance stability of the optical system after assembly.

[0047] Optionally, the lens holder body 231 includes two mounting arms 235 spaced apart from each other and an end wall 236 connected to one end of the mounting arms 235; a light window 237 is provided on the end wall 236, and the light window 237 forms a first lens mounting position 232; the second lens mounting position 233 includes a support plate 2331 connected between the mounting arms 235, support columns 2332 respectively arranged on the inner side of the mounting arms 235 and close to the support plate 2331, and a barb portion 2333 formed by bending and extending from the top of the support column 2332, and an installation space for assembling the positive lens 31 is formed between the barb portion 2333 and the support plate 2331. Among them, one end of the mounting arm 235 is an end wall 236 provided with a light window 237, and the galvanometer scanning assembly 20 is arranged at the end of the mounting arm 235 away from the light window 237. The light reflected by the galvanometer scanning assembly 20 in two-dimensional directions passes through the positive lens 31 and the negative lens 32 in sequence, and the outgoing light path is toward the direction of the position of the light window 237. The positive lens 31 and the negative lens 32 are arranged in sequence on the outgoing light path of the galvanometer scanning assembly 20. In this embodiment, the negative lens 32 is arranged at the position of the light window 237, and the positive lens 31 is arranged in front of the light window 237. The mounting arm 235 is provided with an installation space for the positive lens 31 to be installed and fixed, which is defined by the support plate 2331, the support column 2332 and the barb 2333, in front of the light window 237 and at a preset distance from the light window 237. It is not only convenient for assembly, but also conducive to ensuring the stability of the expansion angle performance of the beam expansion assembly 30 after assembly.

[0048] See also Figure 7In the beam expansion assembly 30, the outer contour of the incident surface of the positive lens 31 is rectangular, the long side of the rectangle corresponds to the horizontal scanning angle range of the first galvanometer 21, and the short side of the rectangle corresponds to the vertical scanning angle range of the second galvanometer 22; the outer contour of the incident surface of the negative lens 32 is circular, and the diameter of the circle corresponds to the larger of the horizontal scanning angle range and the vertical scanning angle range. The principle of the beam expansion assembly 30 is a positive lens 31 plus a negative lens 32, and the optical principle of the aphotic focal length of the inverted Galilean telescope. Only two spherical lenses are used to achieve an angle expansion multiple of up to 2 times, and a larger angle expansion multiple is achieved by using the minimum number of lens elements (two lenses). In this embodiment, the angle expansion multiple of the beam expansion assembly 30 is 2 times, and the angle expansion multiple is the ratio of the focal length of the positive lens 31 to the focal length of the negative lens 32. The positive lens 31 is set to a rectangular shape, and through the setting of the second lens mounting position 233, the positive lens 31 is placed as close to the beam combining assembly 10 and the galvanometer as possible, which can effectively ensure that after the galvanometer scanning assembly 20 performs scanning in two dimensions, the light within the respective scanning angle range can be effectively covered by the light incident surface of the beam expansion assembly 30. At the same time, the overall size of the optical system can be minimized, making the overall structure of the optical system more compact.

[0049] In some embodiments, the barb portion 2333 at the top of the support column 2332 is an inclined positioning surface on the side away from the installation space, and the beam combining assembly 10 is installed on the inclined positioning surface. When the positive lens 31 is assembled, the barb portion 2333 can be against the top surface of the positive lens 31 to maintain the installation stability of the positive lens 31. The top surface of the barb portion 2333 at the top of the support column 2332 is formed as an inclined positioning surface for assembling and positioning the beam combining assembly 10, which is not only convenient for assembly, but also facilitates more accurate control of the relative position and distance relationship between the light finally emitted by the beam combining assembly 10 and the first galvanometer 21 installed at the bottom of the main mirror seat 23, ensuring the stability of the optical path.

[0050] Optionally, the inclined positioning surface is higher than the top surface of the mounting arm 235, and the beam combining assembly 10 is mounted on the inclined positioning surface and has an exit port facing the first galvanometer 21. The laser light source 11 is 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. Among them, 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 beam combining assembly 10 further includes a collimating lens arranged in the optical path of each laser light source 11 incident on the beam combiner 12. The beam combining assembly 10 is located above the beam expansion assembly 30. Specifically, the inclination direction of the exit port of the beam combining assembly 10 disposed at the top of the barb portion 2333 is consistent with the inclined positioning surface and faces the first galvanometer 21 disposed at the bottom of the main mirror seat 23, so that the beam combining assembly 10, the beam expansion assembly 30 and the galvanometer scanning assembly 20 can be as close to each other as possible and the overall structural compactness of the optical system can be improved. The beam combining assembly 10 can adopt a beam combining polarization scheme or a color beam combining scheme, both of which can achieve the purpose of combining multiple laser light sources 11 to enhance brightness, and the present application does not impose any restrictions on this.

[0051] In some embodiments, the beam combining assembly 10 adopts a monochromatic light beam combining polarization scheme, 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. 9 In 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 emits along the same optical path, 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.

[0052] In other embodiments, the beam combining assembly 10 adopts a color beam combining solution, and a red laser source, a green laser source, and a blue laser source are respectively disposed on three sides of the beam combiner 12. Fig.10 , R\G\B represent red, green, and blue respectively. Lasers of the same color are combined by polarization, and lasers of different colors are 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. 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.

[0053] In some embodiments, see Fig.12 and Fig.13 The beam combining assembly 10 also includes a beam combining mirror seat 13, which includes a joint end 131 and a plurality of connecting posts 132 extending vertically outward from the joint end 131, and one side of the beam combining mirror seat 13 is in contact with the inclined positioning surface; the laser light source 11 includes a laser seat 112, and a mounting opening is formed between adjacent connecting posts 132 for the laser seat 112 of the corresponding laser light source 11 to be embedded and fixed. Among them, the joint end 131 is in the shape of a rectangular plate, and the plurality of connecting posts 132 are respectively located at the four corners of the joint end 131, so that the overall outer contour of the beam combining mirror seat 13 is roughly in the shape of a rectangular parallelepiped. In this way, mounting openings are respectively formed between two adjacent connecting posts 132, and the sizes thereof can respectively correspond to the sizes 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 combining mirror seat 13. The laser can be installed as a light source in the corresponding laser holder 112. By assembling the laser holder 112 and the beam combiner holder 13, the position and direction of the laser can be limited. This is equivalent to pre-designing the relative position of the light emitted by the laser to the beam combiner 12 located in the pre-beam combiner holder 13, thereby ensuring the accuracy of the optical path for combining the light from the multiple laser light sources 11.

[0054] Optionally, the beam combining assembly 10 also includes a beam combining heat dissipation module. Among them, the laser seat 112 is provided with a first heat conductive block 15 on the side close to the joint end 131, and the first heat conductive block 15 includes a heat conductive surface respectively attached to the end face of the laser seat 112 and a heat conductive surface respectively 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 face close to the joint end 131 to fully utilize the idle space between the beam combining assembly 10 and the main mirror seat 23 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. Optionally, the end of the beam combining mirror seat 13 opposite to the joint end 131 is an open end, and at least one of the joint end 131 and the open end is provided with a second heat conducting block 16, and the 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 main mirror seat 23. In this embodiment, the second heat conducting blocks 16 are respectively installed at the opposite ends of the beam combining mirror seat 13, and the second heat conducting block 16 includes a plug-in portion matching 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 designed as a rectangular heat sink block, which transfers the heat of the beam combining assembly 10 to the main mirror seat 23, and has a good heat dissipation capacity, thereby improving the heat dissipation effect on the laser.

[0055] 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 beam combining assembly 10 can be improved.

[0056] 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 Fig.14 and Fig.15 The outer surface of the second heat conducting block 16 may also be formed with a plurality of mutually spaced and parallel heat dissipating fins 161, and air flow channels are formed between adjacent heat dissipating fins, which can increase the heat dissipation area of ​​the second heat conducting block 16. In other embodiments, please refer to Fig.16 and Fig.17 The 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 conduction process from the laser seat 112 to the primary mirror seat 23, which can reduce thermal resistance and improve heat dissipation efficiency.

[0057] See also Figures 18 to 20In some embodiments, the main mirror seat 23 further includes a galvanometer mounting portion provided on the mirror seat body 231; the galvanometer mounting portion includes a first galvanometer mounting position 24 for mounting the first galvanometer 21 and a second galvanometer mounting position 25 for mounting the second galvanometer 22, and the first galvanometer mounting position 24 and the second galvanometer mounting position 25 provide an assembly position relationship of a preset angle between the first galvanometer 21 and the second galvanometer 22. In this embodiment, the combined laser beam emitted by the beam combining assembly 10 passes through the first galvanometer 21 and the second galvanometer 22 in sequence, and is finally reflected by the second galvanometer 22 to the beam expansion assembly 30. By designing the main mirror seat 23 as the main bearing structure of the optical system, the reference coordinate system is set with the length and width of the main mirror seat 23, and the beam combining assembly 10 and the first galvanometer 21 are respectively mounted on the top and bottom of the main mirror seat 23, and the second galvanometer 22 and the beam expansion assembly 30 are respectively mounted on the front and rear ends of the main mirror seat 23. Specifically, the first galvanometer mounting position 24 is arranged at the bottom of the main mirror seat 23, and is opposite to the beam combining assembly 10 located above the main mirror seat 23; the second galvanometer mounting position 25 is arranged at the rear end of the main mirror seat 23, and is opposite to the beam expanding assembly 30 arranged at the front end of the main mirror seat 23 near the end wall 236, so that the overall structure of the optical system is more compact and small in size. The angle range of the preset angle is usually 30 to 60 degrees.

[0058] Optionally, the first galvanometer mounting position 24 includes an inclined abutment surface formed at the bottom of the mirror base body 231 and a first guide structure provided on the inclined abutment surface; the first galvanometer 21 includes a galvanometer positioning seat 213, and the second galvanometer 21 is provided with a second guide structure matched with the first guide structure, and the first galvanometer 21 can be moved and adjusted along the width direction of the mirror base body 231 and along the length direction of the mirror base body 231 respectively through the second guide structure and the first guide structure. The first galvanometer 21 and the inclined abutment surface at the bottom of the mirror base body 231 for assembling the first galvanometer 21 are designed to cooperate with each other through the first guide structure and the second guide structure, so that the first galvanometer 21 can be movable and adjusted in the horizontal direction and the vertical direction within the plane where the inclined abutment surface is located. In this way, a certain assembly adjustment redundancy can be provided for the first galvanometer 21, and the direction and range of the light path of the beam combining component 10 incident on the first galvanometer 21 and the light path reflected from the first galvanometer 21 to the second galvanometer 22 are more accurate through the adjustment of the position of the first galvanometer 21.

[0059] Optionally, the first guide structure includes a guide groove 240 extending along the width direction of the mirror base body 231, and the second guide structure includes a slider provided on the galvanometer mirror positioning seat 213 and can be embedded in the guide groove 240 and slide along the same. In this embodiment, the mounting arms 235 of the mirror base body 231 are hollowed out, and the guide groove 240 corresponds to the bottom surface of the support plate 2331 connected between the mounting arms 235 for supporting the installation of the positive lens 31, so as to provide the first galvanometer mirror 21 to slide in the guide groove 240 provided along the width direction of the mirror base body 231. Optionally, the first guide structure includes a guide convex strip 243 provided at the bottom of the mirror base body 231 and extending along the length direction of the mirror base body 231, and the second guide structure includes a slide groove 242 provided on the first galvanometer mirror 21 and for the convex strip to be embedded and slide along the same. In this embodiment, the galvanometer positioning seat 213 can be provided with guide protrusions 243 at the opposite sides close to the mounting arm 235, and the opposite sides of the first galvanometer 21 are correspondingly provided with sliding grooves 242 matching the guide protrusions 243, so as to provide the first galvanometer 21 with sliding grooves 242 to achieve adjustment and movement along the length direction of the mirror seat body 231.

[0060] In some embodiments, the second galvanometer mounting position 25 includes an inclined mounting surface 252 facing the beam expansion mounting portion, and a stop surface 251 is provided at the connection between the mounting arm 235 and the inclined mounting surface 252; the second galvanometer 22 is mounted on the inclined mounting surface 252 and abuts against the stop surface 251. The second galvanometer mounting position 25 is provided at one end of the main mirror seat 23 away from the end wall 236 provided with the light window 237, and the inclined direction of the inclined mounting surface 252 enables the reflected light of the second galvanometer 22 mounted thereon to be emitted horizontally in the direction of the light window 237. A plurality of positioning pins may be provided on the inclined mounting surface 252, and the second galvanometer 22 is correspondingly provided with positioning holes matching the positioning pins, and the second galvanometer 22 is installed on the main mirror seat 23 to be positioned by inserting the positioning pins into the corresponding positioning holes.

[0061] In some embodiments, the first galvanometer mirror 21 in the galvanometer mirror scanning assembly 20 is a piezoelectric micromirror disposed on a fast-axis scanning dimension, and the second galvanometer mirror 22 is an electromagnetic micromirror disposed on a slow-axis scanning dimension. Among them, the first galvanometer 21 corresponds to the range of horizontal scanning angles of the target projection surface finally formed, and the second galvanometer 22 corresponds to the range of vertical scanning angles of the target projection surface finally formed, and the horizontal scanning angle is greater than the vertical scanning angle. The first galvanometer 21 adopts a piezoelectric micromirror, and the second galvanometer 22 adopts an electromagnetic micromirror. The piezoelectric micromirror uses the combined laser emitted by the beam combining component 10 as the incident light to perform horizontal dimension scanning and reflect the combined laser to the electromagnetic micromirror, and then the electromagnetic micromirror performs vertical dimension scanning and reflects the combined laser to the beam expansion component 30. The advantages of low power consumption, large driving force and small size of piezoelectric micromirrors and electromagnetic micromirrors are utilized, and the piezoelectric micromirrors and electromagnetic micromirrors are used to provide different scanning angle ranges required in the horizontal and vertical dimensions respectively, so as to better achieve the purpose of taking into account projection performance such as large field of view, high brightness, customized dynamic display of projection, and high resolution while ensuring the small size of the optical system.

[0062] In some embodiments, please refer to 3. Fig.21 and Fig. 22 The optical system also includes a housing 40 that integrates the beam combining assembly 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 beam combining assembly 10, the galvanometer scanning assembly 20, 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 piece and a buckle, 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 exit of the optical path of the optical system. The beam expander assembly 30 includes a positive lens 31 and a negative lens 32 arranged in sequence on the final output light path of the optical system. Therefore, the position and size of the light outlet 45 can be set according to the negative lens 32 in the beam expander assembly 30. In this embodiment, the outer contour of the negative lens 32 is circular, and the shape and size of the light outlet 45 are the same as those of the negative lens 32. When the optical system 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.

[0063] Optionally, the optical system 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 and is convenient for assembly, and the circuit board 47 can be easily repaired by removing the side panel 43. The electric control circuits and components of each component in the optical system can be integrated on the circuit board 47. In this embodiment, the circuit control board of each laser light source 11 of the beam combining component 10, the drive circuit control board of each galvanometer in the galvanometer scanning component 20, and the control circuit in the beam expanding component 30 to eliminate the distortion generated during the angle expansion process of the angle expanding lens 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 optical system can be more simple and convenient to operate.

[0064] On the other hand, the embodiment of the present application also provides a laser scanning projection product, including a mainboard and an optical machine, the optical machine and the mainboard are electrically connected through a wire connector, and the optical machine may include an optical system of any of the above embodiments. Among them, the laser scanning projection product 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, various portable projectors, holographic imaging helmets, AR glasses, etc., which are not limited here.

[0065] 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. An optical system, characterized in that: include: A beam combining component, comprising a plurality of laser light sources and a beam combiner, wherein the beam combiner combines the light emitted by the plurality of laser light sources into a combined laser beam emitted in a target direction; 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 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 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.

2. The optical system according to claim 1, wherein: The galvanometer scanning assembly further comprises a main mirror seat, wherein the main mirror seat comprises a mirror seat body and a beam expansion mounting portion arranged on the mirror seat body; The beam expansion assembly includes a positive lens and a negative lens arranged in sequence along the output light path of the second galvanometer, and the beam expansion mounting portion includes a first lens mounting position for correspondingly mounting the negative lens and a second lens mounting position for correspondingly mounting the positive lens.

3. The optical system according to claim 2, characterized in that The mirror base body comprises two installation arms spaced apart from each other and an end wall connected to one end of the installation arms; A light window is provided on the end wall, and the light window forms the first lens installation position; The second lens mounting position includes a support plate connected between the mounting arms, support columns respectively arranged on the inner sides of the mounting arms and close to the support plate, and a barb portion formed by bending and extending from the top end of the support column, and an installation space for assembling the positive lens is formed between the barb portion and the support plate.

4. The optical system according to claim 3, characterized in that The barb portion is provided with an inclined positioning surface at a side away from the installation space, and the beam combining assembly is mounted on the inclined positioning surface.

5. The optical system according to claim 4, characterized in that The inclined positioning surface is higher than the top surface of the mounting arm, and the beam combining assembly is mounted on the inclined positioning surface and has an emission port facing the first galvanometer; The laser light source is one of the following: The laser light source comprises an S-light polarized light source and a P-light polarized light source respectively arranged on different sides of the beam combiner; The laser light source comprises a first P-light polarized light source and a second P-light polarized light source respectively arranged on different sides of the beam combiner, and a half-wave plate located between the second P-light polarized light source and the beam combiner; The laser light source comprises a red laser source, a green laser source and a blue laser source which are respectively arranged on different sides of the beam combiner.

6. The optical system according to claim 4, characterized in that The beam combining assembly further includes a beam combining mirror seat, the beam combining mirror seat including a joint end and a plurality of connecting columns extending vertically outward from the joint end, and one side of the beam combining mirror seat is in contact with the inclined positioning surface; The laser light source comprises a laser seat, and a mounting opening for the laser seat corresponding to the laser light source to be embedded and fixed is formed between adjacent connecting pillars.

7. The optical system according to claim 6, characterized in that The laser seat is provided with a first heat-conducting block on one side close to the joint end, 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; and / or, The end of the beam combining mirror seat opposite to the joint end is an open end, and at least one of the joint end and the open end is provided with a second heat conductive block, and the second heat conductive block includes a heat conductive surface attached to the surface of the beam combining mirror seat and a heat conductive surface attached to the surface of the main mirror seat.

8. The optical system according to claim 7, characterized in that The heat-conducting surfaces are coated with heat-conducting silicon or graphene respectively.

9. The optical system according to claim 3, characterized in that The outer contour of the incident surface of the positive lens is a rectangle, wherein the long side of the rectangle corresponds to the horizontal scanning angle range of the first galvanometer, and the short side of the rectangle corresponds to the vertical scanning angle range of the second galvanometer; The outer contour of the incident surface of the negative lens is circular.

10. The optical system according to claim 3, wherein: The main mirror seat also includes a galvanometer mirror mounting portion provided on the mirror seat body; The galvanometer mounting portion includes a first galvanometer mounting position for mounting the first galvanometer and a second galvanometer mounting position for mounting the second galvanometer. The first galvanometer mounting position and the second galvanometer mounting position provide an assembly position relationship with a preset angle between the first galvanometer and the second galvanometer.

11. The optical system according to claim 10, wherein: The first galvanometer mounting position includes an inclined abutting surface formed at the bottom of the mirror base body and a first guiding structure provided on the inclined abutting surface; The first galvanometer includes a galvanometer positioning seat, and the first galvanometer is provided with a second guide structure that cooperates with the first guide structure. The first galvanometer can be moved and adjusted along the width direction of the mirror base body and along the length direction of the mirror base body through the second guide structure and the first guide structure.

12. The optical system according to claim 11, wherein: The first guiding structure comprises a guiding groove extending along the width direction of the mirror seat body, and the second guiding structure comprises a sliding block provided on the galvanometer positioning seat and capable of being embedded in the guiding groove and sliding along the guiding groove; and / or, The first guiding structure includes a guiding convex strip arranged at the bottom of the mirror seat body, and the second guiding structure includes a sliding groove arranged at the first galvanometer mirror and along which the convex strip slides after being embedded.

13. The optical system according to claim 10, wherein: The second galvanometer mounting position comprises an inclined mounting surface facing the beam expansion mounting portion, and a stop surface is provided at the connection between the mounting arm and the inclined mounting surface; The second galvanometer is mounted on the inclined mounting surface and abuts against the stop surface.

14. The optical system according to any one of claims 1 to 13, characterized in that The expansion angle of the beam expander is 2 times; or, the beam expander comprises a positive lens and a negative lens arranged in sequence along the output light path of the second galvanometer, and the ratio of the focal length of the positive lens to the focal length of the negative lens is 2.

15. The optical system according to any one of claims 1 to 13, characterized in that The first galvanometer is a piezoelectric micromirror arranged on a fast-axis scanning dimension, and the second galvanometer is an electromagnetic micromirror arranged on a slow-axis scanning dimension.

16. The optical system according to any one of claims 1 to 13, characterized in that Also includes a main shell and a side plate detachably connected to the main shell; The main housing and the side plate together define a storage space for storing the beam combining assembly, the galvanometer scanning assembly and the beam expanding assembly; The side surface of the main shell is provided with a light outlet at a position corresponding to the beam expansion component; and / or the optical system also includes a circuit board accommodated in the accommodation space and arranged close to the side panel, and the bottom surface of the main shell is provided with a wiring channel for the wires to pass through at a position corresponding to the circuit board.

17. A laser scanning projection product, characterized in that: It comprises a mainboard and an optical engine, wherein the optical engine is electrically connected to the mainboard via a wire connector, and the optical engine comprises the optical system as claimed in any one of claims 1 to 16.

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