Optical engine and laser projection device

Abstract

The application discloses an optical engine and a laser projection device, and belongs to the field of projection display. The optical engine comprises a shell, a laser, a digital micro-mirror device (DMD) and a light path assembly. The first mounting hole and the second mounting hole are arranged on the shell and are communicated with two accommodating cavities of the shell, and the laser is fixed outside the first accommodating cavity of the shell and the light emitting surface thereof faces the first mounting hole. The DMD light valve is fixed outside the second accommodating cavity of the shell and the light receiving surface thereof faces the second mounting hole, and the laser beam emitted by the laser can pass through the first mounting hole, the light path assembly and the second mounting hole in sequence and is shot to the DMD light valve. The laser, the light path assembly and the DMD light valve can be integrated in the same packaging shell, the volume of the optical engine is effectively reduced (the miniaturization design of the laser projection device integrated with the optical engine is facilitated), the manufacturing cost of the optical engine is reduced, and the relative position precision of the packaged light path is improved.

Description

Technical Field

[0001] This application relates to the field of projection display, and in particular to an optical engine and a laser projection device. Background Technology

[0002] A laser projection system includes a projection screen and a laser projection device. The laser projection device can project images onto the projection screen to achieve functions such as video playback.

[0003] Currently, laser projection equipment typically includes a laser light source, an illumination system, and a projection lens. The laser light source and the illumination system are encapsulated in separate housings, and then the housing containing the laser light source and the housing containing the illumination system are assembled together.

[0004] However, the encapsulation of the laser source and illumination system in laser projection equipment using the above method results in a large overall size of the laser projection equipment. Summary of the Invention

[0005] This application provides an optical engine and a laser projection device. It solves the problem of the large overall size of existing laser projection devices. The technical solution is as follows:

[0006] On one hand, an optical engine is provided, the optical engine comprising:

[0007] Housing, laser, digital micromirror device (DMD), optical valve, and optical path assembly;

[0008] The housing has: a first receiving cavity and a second receiving cavity arranged side by side, a first mounting hole communicating with the first receiving cavity, and a second mounting hole communicating with the second receiving cavity. The first receiving cavity and the second receiving cavity are connected. The first mounting hole and the second mounting hole are respectively located on opposite sides of the housing.

[0009] The laser is fixedly connected to the housing outside the first receiving cavity, and the light-emitting surface of the laser faces the first mounting hole;

[0010] The DMD light valve is fixedly connected to the housing outside the second receiving cavity, and the light-receiving surface of the DMD light valve faces the second mounting hole;

[0011] A portion of the optical path assembly is located within the first accommodating cavity, and another portion is located within the second accommodating cavity. The optical path assembly is used to guide the laser beam emitted from the light-emitting surface to the light-receiving surface.

[0012] The light-emitting surface and the light-receiving surface are arranged in parallel.

[0013] On the other hand, a laser projection device is provided, the laser projection device comprising:

[0014] The projection lens and the optical engine, wherein the optical engine is any of the optical engines given above.

[0015] The beneficial effects of the technical solutions provided in this application include at least the following:

[0016] An optical engine may include a housing, a laser, a digital micromirror device (DMD), and an optical path assembly. By providing a first mounting hole and a second mounting hole on the housing, communicating with two cavities of the housing, the laser is fixed outside the first cavity of the housing with its light-emitting surface facing the first mounting hole. The DMD optical valve is fixed outside the second cavity of the housing with its light-receiving surface facing the second mounting hole. The laser beam emitted by the laser can sequentially pass through the first mounting hole, the optical path assembly, and the second mounting hole before reaching the DMD optical valve. This integrates the laser, optical path assembly, and DMD optical valve into a single package, effectively reducing the size of the optical engine (facilitating miniaturization of laser projection devices integrating this optical engine), lowering manufacturing costs, and improving the relative positional accuracy of the packaged optical path. Furthermore, integrating this optical engine into a laser projection device results in a smaller overall size of the laser projection device. Attached Figure Description

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

[0018] Figure 1 This is a schematic diagram of the structure of an optical engine provided in an embodiment of this application;

[0019] Figure 2 yes Figure 1 A schematic diagram of the structure on the other side of the optical engine is shown;

[0020] Figure 3 This is a schematic diagram of one side of a housing provided in an embodiment of this application;

[0021] Figure 4 This is a schematic diagram of the structure of the other side of a housing provided in an embodiment of this application;

[0022] Figure 5 This is a front view of an optical engine provided in an embodiment of this application;

[0023] Figure 6This is a rear view of an optical engine provided in an embodiment of this application;

[0024] Figure 7 This is a schematic diagram of another optical engine provided in an embodiment of this application;

[0025] Figure 8 This is an exploded view of a portion of the structure of an optical engine provided in an embodiment of this application;

[0026] Figure 9 This is a schematic diagram of the installation of a first spring clip and a housing provided in an embodiment of this application;

[0027] Figure 10 yes Figure 9 The diagram shown is a structural schematic of the first spring clip.

[0028] Figure 11 This is a schematic diagram of the structure of another optical engine provided in the embodiments of this application;

[0029] Figure 12 This is a partially exploded view of another optical engine provided in an embodiment of this application;

[0030] Figure 13 yes Figure 12 The diagram shows the structure of the optical engine;

[0031] Figure 14 yes Figure 12 A magnified view of part A;

[0032] Figure 15 This is an exploded view of a partial structure of another optical engine provided in an embodiment of this application;

[0033] Figure 16 yes Figure 15 The diagram shows the structure of the optical engine;

[0034] Figure 17 yes Figure 15 A magnified view of the area at point B;

[0035] Figure 18 This is a partially exploded view of another optical engine provided in an embodiment of this application;

[0036] Figure 19 yes Figure 18 The diagram shows the structure of the optical engine;

[0037] Figure 20 yes Figure 18 A magnified view of the area at point C;

[0038] Figure 21This is an exploded view of a partial structure of an optical engine provided in another embodiment of this application;

[0039] Figure 22 yes Figure 21 The diagram shows the structure of the optical engine;

[0040] Figure 23 This is a schematic diagram of the structure of a second auxiliary spring provided in an embodiment of this application;

[0041] Figure 24 This is a schematic diagram of the structure of another optical engine provided in the embodiments of this application;

[0042] Figure 25 This is a schematic diagram of another optical engine provided in the embodiments of this application;

[0043] Figure 26 This is a schematic diagram showing the connection between a first reflector support platform and a first adjustment assembly provided in an embodiment of this application;

[0044] Figure 27 This is a schematic diagram of the structure of an optical engine provided in another embodiment of this application;

[0045] Figure 28 This is a schematic diagram of another optical engine provided in another embodiment of this application.

[0046] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0048] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of an optical engine provided in an embodiment of this application. Figure 2 yes Figure 1 The diagram shows the structure of the other side of the optical engine. The optical engine 000 may include: a housing 100, a laser 200, a digital micromirror device (DMD) 300, and an optical path assembly 400.

[0049] The housing 100 in the optical engine 000 may have: a first receiving cavity 101a and a second receiving cavity 101b arranged side by side; a first mounting hole 102 communicating with the first receiving cavity 101a; and a second mounting hole 103 communicating with the second receiving cavity 101b. The first receiving cavity 101a and the second receiving cavity 101b of the housing 100 are in communication, and the first mounting hole 102 and the second mounting hole 103 may be located on opposite sides of the housing 100. For example, the housing 100 has opposite sides a1 and a2, the first mounting hole 102 may be located on the a1 side of the housing 100, and the second mounting hole 103 may be located on the a2 side of the housing 100.

[0050] The laser 200 in the optical engine 000 can be fixedly connected to the housing 100 outside the first receiving cavity 101a in the housing 100, and the light emitting surface of the laser 200 can face the first mounting hole 102 in the housing 100.

[0051] The DMD light valve 300 in the optical engine 000 can be fixedly connected to the housing 100 outside the second receiving cavity 101b in the housing 100, and the light-receiving surface of the DMD light valve 300 can face the second mounting hole 103 in the housing 100.

[0052] A portion of the optical path assembly 400 (which includes multiple optical components) in the optical engine 000 may be located within the first receiving cavity 101a in the housing 100, while another portion of the optical path assembly 400 may be located within the second receiving cavity 101b in the housing 100. Furthermore, the optical path assembly 400 can be used to guide the laser beam emitted from the light-emitting surface of the laser 200 to the light-receiving surface of the DMD optical valve 300.

[0053] The light-emitting surface of the laser 200 can be arranged parallel to the light-receiving surface of the DMD light valve 300.

[0054] In this application, a first mounting hole 102 and a second mounting hole 103 communicating with two receiving cavities of the housing 100 in the optical engine 000 are provided. The laser 200 is fixed outside the first receiving cavity 101a of the housing 100 with its light-emitting surface facing the first mounting hole 102. The DMD light valve 300 is fixed outside the second receiving cavity 101b of the housing 100 with its light-receiving surface facing the second mounting hole 103. The laser beam emitted by the laser 200 can sequentially pass through the first mounting hole 102, the optical path assembly 400, and the second mounting hole 103 to be directed to the DMD light valve 300. That is, the laser 200, the optical path assembly 400, and the DMD light valve 300 can be integrated into the same package housing, effectively reducing the size of the optical engine 000 (facilitating the miniaturization design of laser projection equipment integrating the optical engine), reducing the manufacturing cost of the optical engine 000, and improving the relative positional accuracy of the packaged optical path. Furthermore, integrating this optical engine 000 into the laser projection device can reduce the overall size of the laser projection device.

[0055] In summary, this application provides an optical engine that may include a housing, a laser, a digital micromirror device (DMD), and an optical path assembly. By providing a first mounting hole and a second mounting hole on the housing of the optical engine, communicating with two cavities of the housing, and fixing the laser outside the first cavity of the housing with its light-emitting surface facing the first mounting hole, and fixing the DMD optical valve outside the second cavity of the housing with its light-receiving surface facing the second mounting hole, the laser beam emitted by the laser can sequentially pass through the first mounting hole, the optical path assembly, and the second mounting hole to reach the DMD optical valve. This integrates the laser, optical path assembly, and DMD optical valve into the same packaged housing, effectively reducing the size of the optical engine (facilitating miniaturization of the laser projection device integrating the optical engine), lowering the manufacturing cost of the optical engine, and improving the relative positional accuracy of the packaged optical path. Furthermore, integrating this optical engine into a laser projection device results in a smaller overall size of the laser projection device.

[0056] Optional, please refer to Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of one side of a housing provided in an embodiment of this application. Figure 4This is a schematic diagram of the structure of another side of a housing provided in an embodiment of this application. The housing 100 in the optical engine 000 may include: a first housing A1 and a second housing A2 arranged side by side. The first housing A1 may have a first mounting hole 102 and a first receiving cavity 101a that are interconnected; the second housing A2 may have a second mounting hole 103 and a second receiving cavity 101b that are interconnected. For example, the first housing A1 and the second housing A2 may be independent structures and assembled into a housing by a fixed connection; or, the first housing A1 and the second housing A2 may be an integral structure. This embodiment of the application does not specifically limit this.

[0057] In the embodiments of this application, such as Figure 3 and Figure 4 As shown, the first receiving cavity 101a in the housing 100 may have a first assembly opening k1, and the second receiving cavity 101b in the housing 100 may have a second assembly opening k2. The first assembly opening k1 and the second assembly opening k2 may be located on opposite sides of the housing 100. In this application, the first assembly opening k1 and the opening of the second mounting hole 103 in the housing 100 are located on the same side of the housing 100, and the second assembly opening k2 may be located on the same side of the housing 100 as the opening of the first mounting hole 102. For example, the first assembly opening k1 and the opening of the second mounting hole 103 in the housing 100 are located on the a2 side of the housing 100, and the second assembly opening k2 may be located on the a1 side of the housing 100 as the opening of the first mounting hole 102.

[0058] Optional, such as Figure 3 As shown, the housing 100 in the optical engine 000 may also have a third mounting hole 104 for connecting the first receiving cavity 101a and the second receiving cavity 101b. The optical path assembly 400 in the optical engine may include a beam homogenizing assembly 401 (shown in subsequent figures) fixed within the third mounting hole 104. Thus, while the beam homogenizing assembly 401 is mounted through the third mounting hole 104, the first receiving cavity 101a and the second receiving cavity 101b can be connected, allowing the laser beam emitted by the laser 200 to be guided into the DMD optical valve 300 through the first receiving cavity 101a, the third mounting hole 104, and the second receiving cavity 101b.

[0059] In the embodiments of this application, please refer to Figure 5 and Figure 6 , Figure 5 This is a front view of an optical engine provided in an embodiment of this application. Figure 6This is a rear view of an optical engine provided in an embodiment of this application. The optical path assembly 400 in the optical engine 000 may further include: a beam combining mirror assembly 402 and a first reflecting mirror 403 fixed within a first receiving cavity 101a. The beam combining mirror assembly 402 may be located on one side of the light-emitting surface of the laser 200, and can be used to combine the laser beam emitted by the laser 200 and guide it to the first reflecting mirror 403. The first reflecting mirror 403 can be used to guide the combined laser beam to a homogenizing assembly 401, which can homogenize the combined laser beam.

[0060] Optional, such as Figure 6 As shown, the optical path assembly 400 in the optical engine 000 may further include: a second reflecting mirror 404 and a prism group 405 fixed in the second receiving cavity 101b. The second reflecting mirror 404 can be used to guide the homogenized laser beam to the prism group 405, and the prism group 405 can be used to guide the laser beam reflected by the second reflecting mirror 404 to the light-receiving surface of the DMD light valve 300. For example, when the beam combining mirror group 402, the first reflecting mirror 403, the homogenizing assembly 401, the second reflecting mirror 404, and the prism group 405 in the optical path assembly 400 are all located in two receiving cavities in the housing 100. The arrangement direction of the laser 200 and the beam combiner group 402 can be perpendicular to the arrangement direction of the beam combiner group 402 and the first reflector 403; the arrangement direction of the prism group 405 and the second reflector 404 can be parallel to the arrangement direction of the beam combiner group 402 and the first reflector 403; the arrangement direction of the first reflector 403, the light homogenizing component 401 and the second reflector 404 can be perpendicular to the arrangement direction of the beam combiner group 402 and the first reflector 403.

[0061] In the embodiments of this application, such as Figure 5 and Figure 6As shown, the optical path assembly 400 may further include: a first lens 406 located between the light combining mirror group 402 and the first reflector 403, a second lens 407 located between the first reflector 403 and the light homogenizing assembly 401, a third lens 408 located between the light homogenizing assembly 401 and the second reflector 404, and a fourth lens 409 located between the second reflector 404 and the prism group 405. For example, the first lens 406 can be used to converge the combined laser beam emitted from the beam combining mirror group 402 and emit the converged laser beam to the first reflector 403; the second lens 407 can be used to diverge the laser beam reflected by the first reflector 403 and emit the diverged laser beam to the homogenizing component 401; the third lens 408 can be used to converge the homogenized laser beam after homogenization by the homogenizing component 401 and emit the converged laser beam to the second reflector 404; the fourth lens 409 can be used to converge the laser beam reflected by the second reflector 404 and emit the converged laser beam to the prism group 405, and the prism group 405 ultimately guides the laser beam to the DMD light valve 300.

[0062] Optional, please refer to Figure 7 and Figure 8 , Figure 7 This is a schematic diagram of another optical engine structure provided in an embodiment of this application. Figure 8 This is an exploded view of a partial structure of an optical engine provided in an embodiment of this application. The housing 100 in the optical engine 000 may further include a beam combining mirror support platform 105 fixed within a first receiving cavity 101a and distributed on both sides of a first mounting hole 102. The beam combining mirror support platform 105 may have multiple parallelly arranged limiting grooves 1051, each limiting groove 1051 communicating with the first mounting hole 102 of the housing 100, and the bearing surfaces of each limiting groove 1051 may be arranged in parallel. The beam combining mirror assembly 402 in the optical path assembly 400 may include multiple lenses 402a corresponding one-to-one with the multiple limiting grooves 1051, each lens 402a being able to fit against the bearing surface of the corresponding limiting groove 1051. In this configuration, by providing beam combining lens assembly support platforms 105 on both sides of the first mounting hole 102 in the housing 100, and by providing multiple parallelly distributed limiting grooves 1051 in the beam combining lens assembly support platforms 105, each lens 402a in the beam combining lens assembly 402 can be fixed within its corresponding limiting groove 1051 and fitted against the bearing surface of the limiting groove. Thus, the limiting groove 1051 provides good support for the lens 402a and ensures the proper mounting position of the multiple lenses 402a. For example, the multiple lenses 402a may include: a first lens b1, a second lens b2, and a third lens b3; correspondingly, the multiple limiting grooves 1051 may include: a first limiting groove c1 corresponding to the first lens b1, a second limiting groove c2 corresponding to the second lens b2, and a third limiting groove c3 corresponding to the third lens b3.

[0063] In this application, the first lens b1, the second lens b2, and the third lens b3 in the beam combining mirror assembly 402 can be arranged sequentially. When the optical engine is working, the laser 200 can emit a green laser to the third lens b3, and the third lens b3 is used to reflect the green laser back to the first lens b1; the laser 200 can also emit a blue laser to the second lens b2, and the second lens b2 can be used to reflect the blue laser back to the first lens b1; the laser 200 can also emit a red laser to the first lens b1, and the three lasers can be combined at the first lens b1, and the first lens b1 can guide the combined laser beam to the subsequent optical path.

[0064] Optional, such as Figure 8 As shown. The optical engine 000 may include a first spring 500, which can be used to simultaneously fix each lens 402a in the beam combining lens assembly 402 within its corresponding limiting groove 1051. In this case, by using the first spring 500 to simultaneously fix each lens 402a in the beam combining lens assembly 402 within its corresponding limiting groove 1051, the number of fixing structures used to fix each lens is reduced, ensuring the relative positional accuracy of each lens 402a in the beam combining lens assembly 402. In this application, please refer to... Figure 9 and Figure 10 , Figure 9 This is a schematic diagram of the installation of a first spring clip and a housing provided in an embodiment of this application. Figure 10 yes Figure 9The diagram shows the structure of the first spring piece 500. The first spring piece 500 may include a first fixing piece 501 and multiple sets of first clamping parts 502. The first fixing piece 501 can be fixed within the first receiving cavity 101a of the housing 100, and the first fixing piece 501 may have a first hollow hole d1 communicating with the first mounting hole 102 in the housing 100. The multiple sets of first clamping parts 502 in the first spring piece 500 may correspond one-to-one with multiple lenses 402a. Each set of first clamping parts 502 may include two first clamping parts fixedly connected to the inner wall of the first hollow hole d1, and the two first clamping parts in each set of first clamping parts 502 may respectively abut against the two ends of the corresponding lens 402a. In this case, by fixing the first fixing piece 501 in the first spring piece 500 to the bottom of the first receiving cavity 101a of the housing 100, and by providing the first hollow hole d1 in the first fixing piece 501, it is convenient for the multiple sets of first clamping parts 502 to connect with the first fixing piece 501. Furthermore, after the first pressing part 502 abuts against the lens 402a, the first hollow hole d1 can provide a certain elastic deformation space for the first pressing part 502. For example, the first pressing part 502 in the first spring 500 can be a bent structure. When the optical combining lens group 402 includes: a first lens b1, a second lens b2 and a third lens b3, the multiple sets of first pressing parts 502 can be three corresponding sets, namely, first pressing part e1, first pressing part e2 and first pressing part e3.

[0065] In this application, as Figure 9 As shown, the first fixing piece 501 may include four sub-fixing pieces connected end to end, and the four sub-fixing pieces may form a ring structure B. For example, the four corners of the ring structure B may have fixing holes (not shown in the figure), and the bottom inside the housing 100 may have fixing posts (not shown in the figure) corresponding to each fixing hole. The ring structure B can be fixed by screws (not shown in the figure) passing through the fixing holes and connecting to the fixing posts.

[0066] In the embodiments of this application, such as Figure 8 , Figure 9 and Figure 10As shown, the multiple light-combining lenses 402a in the light-combining lens assembly 402 may include: a first lens and at least one second lens. The first lens may be the outermost light-combining lens in the light-combining lens assembly 402 located in the optical path transmission direction, and the at least one second lens may be any lens in the light-combining lens assembly 402 other than the first lens. The first spring 500 in the engine housing further includes: a first limiting part 503 corresponding to the first lens, and at least one second limiting part 504 corresponding to at least one second lens. The first limiting part 503 in the first spring 500 can be used to limit the first lens within a corresponding limiting groove 1051, and each second limiting part 504 can be used to limit the corresponding second lens within a corresponding limiting groove 1051. In this case, by providing a first limiting part 503 corresponding to the first lens and at least one second limiting part 504 corresponding to at least one second lens in the first spring 500... The first limiting part 503 can limit the first lens within the corresponding limiting groove 1051, preventing the first lens from falling out of the corresponding limiting groove 1051; the second limiting part 504 can limit the corresponding second lens within the corresponding limiting groove 1051, preventing the second lens from falling out of the corresponding limiting groove 1051. For example, a first lens can be a first lens b1 in a beam combining lens group, and at least one second lens can include: two second lenses (i.e., a second lens b2 and a third lens b3 in the beam combining lens group).

[0067] It should be noted that, please refer to Figure 11 , Figure 11 This is a schematic diagram of another optical engine structure provided in this application embodiment. In other possible implementations, the support platform 105 distributed on both sides of the first mounting hole 102 may also have a plurality of first adhesive dispensing grooves 1052 corresponding one-to-one with a plurality of limiting grooves 1051. Each first adhesive dispensing groove 1052 may communicate with the corresponding limiting groove 1051, and the limiting groove 1051 may be closer to the first mounting hole 102 relative to the first adhesive dispensing groove 1052. The first adhesive dispensing groove 1052 in the beam combining lens assembly support platform 105 may be used to accommodate adhesive dispensing after the lens is supported on the bearing surface of the corresponding limiting groove 1051, so as to bond the lens 402a to the limiting groove 1051 through the adhesive dispensing. That is, in this application, the beam combining lens 402a in the beam combining lens assembly 402 may be fixed by means of spring fixing and / or adhesive dispensing fixing.

[0068] Optional, such as Figure 9 and Figure 10As shown, the first limiting portion 503 in the first spring 500 may include: a first limiting piece D1 fixedly connected to the outer wall of the first fixing piece 501, and a second limiting piece D2 fixedly connected to the side of the first limiting piece D1 opposite to the first fixing piece 501. The surface of the first limiting piece D1 intersects with the surface of the first fixing piece 501 and also intersects with the surface of the second limiting piece D2. The second limiting piece D2 can be used to contact one side of the first lens b1. In this case, by providing the first limiting piece D1 fixedly connected to the outer wall of the first fixing piece 501 and the second limiting piece D2 connected to the side of the first limiting piece D1 opposite to the first fixing piece 501 in the first limiting portion 503, and by having the first limiting piece D1 and the second limiting piece D2 intersect, the first combining lens b1 can be limited within the corresponding limiting groove 1051 by the second limiting piece D2, ensuring the installation reliability of the first combining lens b1. For example, the first limiting piece D1 and the second limiting piece D2 can be an integral structure and can form a bending structure to ensure that it has good elastic deformation.

[0069] In the embodiments of this application, such as Figure 9 and Figure 10 As shown, each second limiting portion 504 in the first spring 501 may include two opposing third limiting pieces D3, both of which can be fixedly connected to the inner wall of the first hollow hole d1 of the first fixing piece 501. The surface of the third limiting piece D3 can be flush with the surface of the first fixing piece 501, and the two opposing third limiting pieces D3 cover at least a portion of the corresponding limiting groove 1051. The third limiting piece D3 in each second limiting portion 504 can be used to contact one side of the corresponding second lens. In this case, by providing two opposing third limiting pieces D3 in each second limiting portion 504, and by fixing the third limiting pieces D3 to the inner wall of the first hollow hole d1, and by covering at least a portion of the corresponding limiting groove 1051, the second limiting portion achieves this. Thus, by using two opposing third limiting pieces D3, a second lens can be limited within the corresponding limiting groove 1051 (for example, by using two opposing third limiting pieces D3, the second lens b2 can be limited within the second limiting groove c2, and the third combining lens b3 can be limited within the third limiting groove c3), ensuring the reliability of the second lens installation. In this application, one second limiting part 504 may include: two opposing third limiting pieces D31; the other second limiting part 504 may include: two opposing third limiting pieces D32. The first pressing part e1 can be fixedly connected to the side of the two third limiting pieces D31 opposite to the first fixing piece 501, and the second pressing part e2 can be fixedly connected to the side of the two third limiting pieces D32 opposite to the first fixing piece 501.

[0070] Optional, please refer to Figure 5 , Figure 12 and Figure 13 , Figure 12 This is a partially exploded view of another optical engine provided in an embodiment of this application. Figure 13 yes Figure 12 The diagram shows a schematic of the optical engine. The optical engine may further include a second spring 600, which can be used to simultaneously fix both the first lens 406 and the second lens 407 within the housing 100. In this case, the second spring 600 is used to simultaneously fix the first lens 406 and the second lens 407 in the optical path assembly 400 within the first receiving cavity 101a in the housing 100. This reduces the number of fixing structures used to fix the lenses and ensures the relative positional accuracy of the first lens 406 and the second lens 407 in the optical path assembly 400. In this application, the second spring 600 may include: a second fixing piece 601 and a third fixing piece 602 fixedly connected, and at least one second clamping part 603 and at least one third clamping part 604. The second fixing piece 601 is fixed inside the housing 100 and has a second hollow hole e1. At least one second pressing part 603 is fixedly connected to the inner wall of the second hollow hole e1 and is used to abut against the side of the edge portion of the first lens 406. The third fixing piece 602 is fixed inside the housing 100 and has a third hollow hole e2. At least one third pressing part 604 is fixedly connected to the inner wall of the third hollow hole e2 and is used to abut against the side of the edge portion of the second lens 407. The length extension direction of the second fixing piece 601 intersects the length extension direction of the third fixing piece 602. For example, the length extension direction of the second fixing piece 601 and the length extension direction of the third fixing piece 602 can be perpendicular. It should be noted that the length extension directions of the second fixing piece 601 and the third fixing piece 602 can be set according to the arrangement direction of the first lens 406 and the second lens 407. This embodiment does not specifically limit this.

[0071] Please refer to the following in this application: Figure 5 and Figure 14 , Figure 14 yes Figure 12A partially enlarged schematic diagram at point A. The housing 100 in the optical engine 000 may further include: a first fixing stage 106 and a second fixing stage 107 fixed within the housing 100. The first fixing stage 106 may have a first fixing groove 106a for mounting the first lens 406; the second fixing stage 107 may have a second fixing groove 107a for mounting the second lens 407. The second spring 600 may be fixedly connected to both the first fixing stage 106 and the second fixing stage 107, the second hollow hole e1 may communicate with the first fixing groove 106a, and the third hollow hole e2 may communicate with the second fixing groove 107a. In this application, the first fixing stage 106 may also have a second adhesive dispensing groove 106b located on both sides of the first fixing groove 106a. The second adhesive dispensing groove 106b may be used to accommodate adhesive dispensing, thereby fixing the first lens 406 within the first fixing groove 106a through the adhesive dispensing. The second fixing stage 107 may also have a third adhesive dispensing groove 107b located on both sides of the second fixing groove 107a. The third adhesive dispensing groove 107b can be used to receive adhesive, so as to fix the second lens 407 in the second fixing groove 107a by dispensing adhesive. That is, the first lens 406 and the second lens 407 can be fixed by means of spring clip fixing and / or adhesive dispensing fixing.

[0072] In the embodiments of this application, please refer to Figure 5 , Figure 15 and Figure 16 , Figure 15 This is an exploded view of a partial structure of another optical engine provided in an embodiment of this application. Figure 16 yes Figure 15The diagram shows a schematic of the optical engine. The optical engine may further include a third spring 700, which can be used to simultaneously fix the light-diffusing component 401 (which may be a compound eye lens) and the third lens 408 within the housing 100. In this case, the third spring 700 is used to simultaneously fix the light-diffusing component 401 and the third lens 408 in the optical path assembly 400 within the housing 100. This reduces the number of fixing structures and ensures the relative positional accuracy of the light-diffusing component 401 and the third lens 408 in the optical path assembly 400. In this application, the third spring 700 may include: a fourth fixing piece 701 and a fifth fixing piece 702 fixedly connected, and at least one fourth clamping part 703 and at least one fifth clamping part 704. The fourth fixing piece 701 is fixed inside the housing 100 and has a fourth hollow hole e3. At least one fourth pressing part 703 is fixedly connected to the inner wall of the fourth hollow hole e3 and abuts against the side of the edge portion of the light-diffusing assembly 401. The fifth fixing piece 702 can be fixed inside the housing 100 and has a fifth hollow hole e4. At least one fifth pressing part 704 can be fixedly connected to the inner wall of the fifth hollow hole e4 and abuts against the side of the edge portion of the third lens 408. The length extension direction of the fourth fixing piece 701 and the length extension direction of the fifth fixing piece 702 can be parallel. It should be noted that the length extension direction of the fourth fixing piece 701 and the extension direction of the fifth fixing piece 702 can be set according to the arrangement direction of the light-diffusing assembly 401 and the third lens 408. This embodiment does not specifically limit this.

[0073] Please refer to the following in this application: Figure 17 , Figure 17 yes Figure 15A partially enlarged schematic diagram at point B. The housing 100 in the optical engine 000 may further include a third fixing stage 108 and a fourth fixing stage 109 fixed within the housing 100. The third fixing stage 108 may have a third fixing groove 108a for mounting the light-diffusing component 401; the fourth fixing stage 109 may have a fourth fixing groove 109a for mounting the third lens 408. The third spring 700 may be fixedly connected to both the third fixing stage 108 and the fourth fixing stage 109, the fourth hollow hole e3 may communicate with the third fixing groove 108a, and the fifth hollow hole e4 may communicate with the fourth fixing groove 109a. In this application, the third fixing stage 108 may also have a fourth adhesive dispensing groove 108b located on both sides of the third fixing groove 108a. This fourth adhesive dispensing groove 108b may be used to accommodate adhesive dispensing, thereby fixing the light-diffusing component 401 within the third fixing groove 108a. The fourth fixing stage 109 may also have a fifth adhesive dispensing groove 109b located on both sides of the fourth fixing groove 109a. The fifth adhesive dispensing groove 109b can be used to receive adhesive, so as to fix the third lens 408 to the fourth fixing groove 109a through this adhesive dispensing. That is, the light homogenizing assembly 401 and the third lens 408 can be fixed by means of spring clip fixing and / or adhesive dispensing fixing.

[0074] Optional, please refer to Figure 6 , Figure 18 and Figure 19 , Figure 18 This is a partially exploded view of another optical engine provided in an embodiment of this application. Figure 19 yes Figure 18 The diagram shows the structure of the optical engine. The optical engine 000 may further include a first auxiliary spring 800, which can also be used to fix the fourth lens 409 within the housing 100. For example, the first auxiliary spring 800 may include a sixth fixing piece 801 and a sixth pressing part 802. The sixth fixing piece 801 may have a sixth hollow hole e5, and the sixth pressing part 802 is fixedly connected to the inner wall of the sixth hollow hole e5, and the sixth pressing part 802 can abut against the fourth lens 409 to fix the fourth lens 409 within the housing 100.

[0075] Please refer to the following in this application: Figure 6 and Figure 20 , Figure 20 yes Figure 18A partially enlarged schematic diagram at point C. The housing 100 in the optical engine 000 may further include: a fifth fixing stage 110 fixed within the housing 100; the fifth fixing stage 110 may have a fifth fixing groove 110a for mounting the fourth lens 409; a first auxiliary spring 800 may be fixedly connected to the fifth fixing stage 110; and a sixth hollow hole e5 in the sixth fixing piece 801 may communicate with the fifth fixing groove 110a. In this application, the fifth fixing stage 110 may also have a sixth adhesive dispensing groove 110b located on both sides of the fifth fixing groove 110a. This sixth adhesive dispensing groove 110b may be used to accommodate adhesive dispensing, thereby fixing the fourth lens 409 within the fifth fixing groove 110a through the adhesive dispensing. That is, the fourth lens 409 may be fixed by means of spring fixing and / or adhesive dispensing.

[0076] In the embodiments of this application, please refer to Figure 6 , Figure 21 and Figure 22 , Figure 21 This is an exploded view of a partial structure of an optical engine provided in another embodiment of this application. Figure 22 yes Figure 21 The diagram shows the structure of the optical engine. The optical path assembly 400 may further include a prism group 409 fixed to one side of the light-receiving surface of the DMD light valve 300. The optical engine 000 may further include two opposing second auxiliary springs 900, which can be used to fix the prism group 409 within the housing 100. In this application, please refer to... Figure 23 , Figure 23 This is a schematic diagram of the structure of a second auxiliary spring sheet provided in an embodiment of this application. Each second auxiliary spring sheet 900 may include: a first sub-auxiliary spring sheet 901, a second sub-auxiliary spring sheet 902, and a third sub-auxiliary spring sheet 903. The first sub-auxiliary spring sheet 901 is fixed to the bottom surface inside the housing 100, and the second sub-auxiliary spring sheet 902 is connected to both the first sub-auxiliary spring sheet 901 and the third sub-auxiliary spring sheet 903. Furthermore, the first sub-auxiliary spring sheet 901, the second sub-auxiliary spring sheet 902, and the third sub-auxiliary spring sheet 903 can form a bent structure.

[0077] In the embodiments of this application, please refer to Figure 24 and Figure 25 , Figure 24 This is a schematic diagram of the structure of another optical engine provided in the embodiments of this application. Figure 25This is a schematic diagram of another optical engine structure provided in an embodiment of this application. The optical engine 000 may further include: two mirror support stages, and a plurality of adjustment components connected to each mirror support stage. The two mirror support stages may be located in the first receiving cavity 101a and the second receiving cavity 101b, respectively, and may be used to support the first mirror 403 and the second mirror 404 in the optical path assembly 400, respectively. Each mirror support stage may have a plurality of adjustment holes (not shown in the figure) corresponding one-to-one with the plurality of adjustment components. Wherein, after each mirror support stage supports the corresponding mirror, the plurality of adjustment components may pass through the plurality of adjustment holes and connect to the corresponding mirror. And each adjustment component can move within the corresponding adjustment hole. For example, the two mirror support stages 1000 may include: a first mirror support stage 1000a for supporting the first mirror 403, and a second mirror support stage 1000b for supporting the second mirror 404. The first reflector support stage 1000a can be located within the first receiving cavity 101a, and the first reflector support stage 1000a can have a plurality of first adjustment holes corresponding one-to-one with the plurality of adjustment components 1100; the second reflector support stage 1000b can be located within the second receiving cavity 101b, and the second reflector support stage 100b can have a plurality of second adjustment holes corresponding one-to-one with the plurality of adjustment components 1100. Furthermore, the plurality of adjustment components 1100 connected to the first reflector support stage 1000a can be first adjustment components 1100a, and the plurality of adjustment components 1100 connected to the second reflector support stage 100b can be second adjustment components 1100b.

[0078] For example, after the first reflector support 1000a carries the first reflector 403, multiple first adjustment components 1100a can pass through multiple first adjustment holes and connect to the first reflector 403. When each first adjustment component 1100a moves within its corresponding first adjustment hole, it can move the first reflector support 1000a, thereby enabling the first reflector support 1000a to move the first reflector 403 and adjust the position of the laser beam spot reflected by the first reflector 403. After the second reflector support 1000b carries the second reflector 404, multiple second adjustment components 1100b can pass through multiple second adjustment holes and connect to the second reflector 404. When each second adjustment component 1100b moves within its corresponding second adjustment hole, it can move the second reflector support 1000b, thereby enabling the second reflector support 1000b to move the second reflector 404 and adjust the position of the laser beam spot reflected by the second reflector 404.

[0079] For example, please refer to Figure 24 and Figure 26 , Figure 26This is a schematic diagram illustrating the connection between a first reflector support platform and a first adjustment assembly according to an embodiment of this application. The first reflector support platform 1000a may include: a first support platform body B1 and multiple first elastic elements B2. A first reflector 403 may be fixedly connected to the first support platform body B1. The side of the first support platform body B1 facing away from the first reflector 403 may have multiple first connecting posts B11, with each of the multiple first connecting posts B11 corresponding to a multiple first elastic element B2, and each first connecting post B11 may have a first adjustment hole g1. Each first elastic element B2 is sleeved on the corresponding first connecting post B11 and abuts against the inner sidewall of the first support platform body B1 and the inner sidewall of the first receiving cavity 101a, and the inner sidewall of the first receiving cavity 101a may have a through hole h1 communicating with the first adjustment hole g1. For example, the first adjusting hole g1 in the first connecting column B11 can be a threaded hole, and the first adjusting component 1100a can be a screw. The first adjusting component 1100a can pass through the through hole h1 and engage with the first adjusting hole g1. When two adjacent first adjusting components 1100a are rotated, the first support platform body B1 can be rotated in one direction, thereby rotating the first reflector 403. It should be noted that the structure and working principle of the first reflector support platform 1000a and the first adjusting component 1100a can be the same as the structure and working principle of the second reflector support platform 1100b and the second adjusting component 1100b, and will not be described in detail here. It should also be noted that, in order to clearly see the first reflector support platform and the first adjusting component, only one first elastic element is shown in the figure.

[0080] Optional, please refer to Figure 3 , Figure 4 , Figure 27 and Figure 28 , Figure 27 This is a schematic diagram of the structure of an optical engine provided in another embodiment of this application. Figure 28 This is a schematic diagram of another optical engine provided in another embodiment of this application. The optical engine 000 may further include: a first sealing cover 1201 and a second sealing cover 1202 disposed opposite to each other. The first sealing cover 1201 is used to seal the opening surface of the first receiving cavity 101a (i.e., the first assembly opening), and the second sealing cover 1202 can be used to seal the opening surface of the second receiving cavity 101b (i.e., the second assembly opening). In this way, the use of the first sealing cover 1201 and the second sealing cover 1202 can provide a certain degree of protection for the components inside the housing 100.

[0081] In summary, this application provides an optical engine that may include a housing, a laser, a digital micromirror device (DMD), and an optical path assembly. By providing a first mounting hole and a second mounting hole on the housing of the optical engine, communicating with two cavities of the housing, and fixing the laser outside the first cavity of the housing with its light-emitting surface facing the first mounting hole, and fixing the DMD optical valve outside the second cavity of the housing with its light-receiving surface facing the second mounting hole, the laser beam emitted by the laser can sequentially pass through the first mounting hole, the optical path assembly, and the second mounting hole to reach the DMD optical valve. This integrates the laser, optical path assembly, and DMD optical valve into the same packaged housing, effectively reducing the size of the optical engine (facilitating miniaturization of the laser projection device integrating the optical engine), lowering the manufacturing cost of the optical engine, and improving the relative positional accuracy of the packaged optical path. Furthermore, integrating this optical engine into a laser projection device results in a smaller overall size of the laser projection device.

[0082] This application embodiment also provides a laser projection device, which may include a projection lens (not shown in the figure) and an optical engine 000. The optical engine may be any of the optical engines given above. For example, the laser beam emitted by the laser in the optical engine is guided by a DMD light valve through an optical path component. The DMD light valve can be used to modulate the laser beam and guide it to the projection lens. The projection lens can project the incident laser to form a projected image. The projection lens may include multiple lenses (not shown in the figure). The laser beam emitted from the DMD light valve can sequentially pass through the multiple lenses in the projection lens and be projected onto the screen to realize the projection of the laser by the projection lens and realize the display of the projected image.

[0083] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0084] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An optical engine, characterized in that, include: Housing, laser, digital micromirror device (DMD), optical valve, and optical path assembly; The housing has: a first receiving cavity and a second receiving cavity arranged side by side, a first mounting hole communicating with the first receiving cavity, and a second mounting hole communicating with the second receiving cavity, the first receiving cavity and the second receiving cavity communicating, the first mounting hole and the second mounting hole being located on opposite sides of the housing; the housing also has: a third mounting hole for communicating with the first receiving cavity and the second receiving cavity; The laser is fixedly connected to the housing outside the first receiving cavity, and the light-emitting surface of the laser faces the first mounting hole; The DMD light valve is fixedly connected to the housing outside the second receiving cavity, and the light-receiving surface of the DMD light valve faces the second mounting hole; The optical path assembly includes: a beam-scaling component fixed in the third mounting hole, a beam-combining mirror assembly and a first reflector fixed in the first accommodating cavity, and a second reflector and a prism assembly fixed in the second accommodating cavity; the beam-combining mirror assembly is located on one side of the light-emitting surface of the laser, and is used to combine the laser beam emitted by the laser and guide it to the first reflector; the first reflector is used to guide the combined laser beam to the beam-scaling component, and the beam-scaling component is used to homogenize the combined laser beam; the second reflector is used to guide the homogenized laser beam to the prism assembly, and the prism assembly is used to guide the laser beam reflected by the second reflector to the DMD optical valve; The light-emitting surface is arranged parallel to the light-receiving surface; the arrangement direction of the beam combining mirror group and the first reflector is perpendicular to the arrangement direction of the laser and the beam combining mirror group, and parallel to the arrangement direction of the prism group and the second reflector, and also perpendicular to the arrangement direction of the first reflector, the light homogenizing component and the second reflector.

2. The optical engine according to claim 1, characterized in that, The first receiving cavity has a first assembly opening, and the second receiving cavity has a second assembly opening. The first assembly opening and the second assembly opening are respectively located on opposite sides of the housing.

3. The optical engine according to claim 2, characterized in that, The first assembly opening and the second mounting hole opening are located on the same side of the housing, and the second assembly opening and the first mounting hole opening are located on the same side of the housing.

4. The optical engine according to any one of claims 1 to 3, characterized in that, The housing also includes: a beam combining mirror support platform fixed in the first accommodating cavity and distributed on both sides of the first mounting hole, the beam combining mirror support platform having a plurality of parallel limiting grooves, each of the limiting grooves communicating with the first mounting hole, and the bearing surfaces of each limiting groove being arranged in parallel. The light combining lens assembly includes multiple lenses corresponding one-to-one with the multiple limiting grooves, and each lens is fitted with the bearing surface of the corresponding limiting groove.

5. The optical engine according to claim 4, characterized in that, The optical engine further includes a first spring, which is used to simultaneously fix each lens in the combining lens group into its corresponding limiting groove.

6. The optical engine according to any one of claims 1 to 3, characterized in that, The optical engine also includes: two mirror mounts, and a plurality of adjustment components connected to each of the mirror mounts; The two reflector support platforms are located in the first receiving cavity and the second receiving cavity, respectively, and are used to support the first reflector and the second reflector, respectively. Each of the aforementioned mirror support platforms has a plurality of adjustment holes corresponding one-to-one with the plurality of adjustment components; In this configuration, after each of the reflector support platforms carries the corresponding reflector, the plurality of adjustment components pass through the plurality of adjustment holes and are connected to the corresponding reflector, and each of the adjustment components can move within the corresponding adjustment hole.

7. A laser projection device, characterized in that, include: A projection lens and an optical engine, wherein the optical engine is the optical engine described in any one of claims 1 to 6.

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