An optical system, a projection light engine and a projector

Abstract

The utility model discloses an optical system, project light machine and projector, including laser, laser light comb mirror piece, first aspheric lens, light source white light reflector, light, first light machine spherical lens, second light machine spherical lens, first light machine reflector, third light machine spherical lens, second light machine reflector, second aspheric lens and TIR prism, and the light comb mirror piece of laser is arranged between the light source white light reflector of light and sets up the light -evening wheel, and the opposite side of TIR prism is arranged digital micromirror device, and one side of TIR prism sets up the galvanometer, and the angle between the incident light and the reflected light of each reflector of laser light comb mirror piece is 90 DEG, and laser light comb mirror piece sets up at least three groups, and each laser light comb mirror piece is arranged in " eight character shape " structure arrangement setting in pair, and the face angle between the light emitting surface of laser and laser light comb mirror piece is 45 DEG. The utility model reduces the physical interval between optical components, and the optical system realizes optical reflection and refraction in limited space, and the space occupied is small.

Description

Technical Field

[0001] This utility model relates to the field of projection equipment technology, and in particular to an optical system, a projection optical engine, and a projector. Background Technology

[0002] The projection optical engine is the core component of a laser projector, used to focus, reflect, and modulate the light generated by a laser source, ultimately projecting a clear image onto the screen. In this complex optical transmission and processing, the projection optical engine contains optical reflection components, focusing components, and modulation / demodulation components. Due to the objective optical reflection requirements of incident and reflected light, the optical reflection components must maintain physical spacing between each optical component to achieve proper light incidence and reflection. This results in a large overall optical system architecture, with the projection optical engine occupying a significant portion of the space.

[0003] Furthermore, based on the aforementioned existing technical solutions, separating the optical reflective components from other optical components would increase the internal space of the projector housing. In order to minimize the increase in the projector housing space and reduce its volume, many projectors also concentrate the light source end and the imaging end in the same cavity housing. Although this reduces the volume of the projector optical engine to a certain extent, it makes the optical components and heat-generating components inside the projector optical engine in the same space, which can easily lead to heat accumulation and affect the working efficiency of the projector optical engine.

[0004] Therefore, developing new optical systems has become the key to improving the optical performance of projectors. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides an optical system, a projection optical engine, and a projector. By employing this optical system, projection optical engine, and projector, on the one hand, the angle between the incident and reflected rays of the laser beams in the laser beam combining lens, the light source white light reflector, the first optical engine reflector, and the second optical engine reflector is all 90°, which reduces deflection errors in laser beam transmission. Combined with the first and second aspherical lenses, this allows the laser beam to maintain better collimation when entering the subsequent optical path, providing more stable incident light for subsequent focusing and imaging. The laser beam combiner is equipped with at least three sets of laser beam combiners, each set of which is arranged in pairs in a figure-eight configuration. The angle between the laser's emitting surface and the laser beam combiner is 45°, which can improve beam utilization, combine multiple laser beams more efficiently, reduce light loss during beam combining, and improve beam utilization. The design of the laser beam combiners being arranged in pairs in a figure-eight configuration greatly reduces the physical distance between the optical components, enabling the optical system to achieve optical reflection and refraction within a limited space. The optical system occupies less internal space in the projection optical engine. On the other hand, the light source end, consisting of a laser, a laser combining lens, and a first aspherical lens, is located within the optical cavity shell. Meanwhile, the optical imaging components—including a white light reflector, a uniform light wheel, a light path, a first optomechanical spherical lens, a second optomechanical spherical lens, a first optomechanical reflector, a third optomechanical spherical lens, a second optomechanical reflector, a second aspherical lens, and a TIR prism—are all located within the imaging cavity shell. This arrangement, placing the optical components and the optical imaging components within the optical cavity shell and imaging cavity shell respectively, disperses the heat distribution to a certain extent, mitigating the heat generated by the optical components from the light... The heat generated by the imaging components is separated, avoiding the problem of heat accumulation caused by the two components being concentrated in the same cavity shell for a short period of time, which would affect the working efficiency of the projection optical engine. The first aspherical lens can effectively correct the spherical aberration of the laser source, while the subsequent combination of multiple sets of spherical lenses, such as the first, second, and third optical engine spherical lenses, can work together to correct chromatic aberration and astigmatism. Finally, the edge image quality is further optimized by the second aspherical lens, realizing multiple aberration correction for broadband lasers in a limited space, thereby reducing the distortion rate at the imaging edge. Furthermore, the combination of multiple spherical lenses can adapt to the focusing characteristics of lasers of different wavelengths, ensuring consistent focusing accuracy of multicolor light on the imaging surface, reducing color shift, and pre-optimizing the beam intensity distribution, thereby improving the initial uniformity of the beam entering the homogenizing wheel and reducing its workload. Moreover, placing the homogenizing wheel between the optical passage and the white light reflector ensures the uniformity and smoothness of the laser beam, eliminates laser speckle, improves brightness uniformity, and mitigates color consistency issues, thus reducing the impact of laser coherence to some extent. To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: This invention proposes an optical system comprising a laser, a laser beam combiner, a first aspherical lens, a light source white light reflector, a light passage, a first optomechanical spherical lens, a second optomechanical spherical lens, a first optomechanical reflector, a third optomechanical spherical lens, a second optomechanical reflector, a second aspherical lens, and a TIR prism, all arranged sequentially along the same optical path. A beam equalizer is positioned between the light passage and the light source white light reflector. A digital micromirror device is arranged on the opposite side of the TIR prism's light-emitting surface. A galvanometer is positioned on the side of the TIR prism furthest from the digital micromirror device. The angle between the incident and reflected rays of the laser beam combiner, the light source white light reflector, the first optomechanical reflector, and the second optomechanical reflector is 90°. At least three sets of laser beam combiners are provided, with each set of laser beam combiners arranged in pairs in a figure-eight configuration. The angle between the emitting surface of the laser and the surface of the laser beam combiner is 45°.

[0006] To solve its technical problem, the further technical solution adopted by this utility model is as follows: Optionally, in the optical system described above, a rotating motor is provided in the axial region of the light-diffusing wheel. The rotating motor is fixedly mounted on the inner surface of the optical cavity shell, and the light-diffusing wheel is sleeved on the rotating shaft of the rotating motor. The rotating motor can drive the light-diffusing wheel to rotate.

[0007] Optionally, in the above-described optical system, the TIR prism is composed of two triangular prisms, which are fixed together by bonding at four points, and the air gap between the two triangular prisms is 0.05 mm.

[0008] Optionally, in the above-described optical system, the light passage is formed by bonding and fixing four cuboid glass blocks together, and a laser-resistant anti-reflection medium film is provided on the inner peripheral surface of the light passage.

[0009] Alternatively, in the aforementioned optical system, the thickness of the laser-resistant anti-reflection dielectric film is 420~680 nm.

[0010] Optionally, in the above-described optical system, the outer peripheral edges of the first aspherical lens, the first optomechanical spherical lens, the second optomechanical spherical lens, the third optomechanical spherical lens, and the second aspherical lens are all provided with lens mounts, and one outer surface of the light source white light reflector, the first optomechanical reflector, and the second optomechanical reflector is fitted with a reflector mount, and the reflector mount and lens mount are all fixedly assembled on the inner surfaces of the optical cavity shell and the imaging cavity shell.

[0011] Further optionally, in the above-described optical system, the laser, laser combining lens, and first aspherical lens are all located within the optical cavity shell, and the light source white light reflector, uniform light wheel, optical path, first optomechanical spherical lens, second optomechanical spherical lens, first optomechanical reflector, third optomechanical spherical lens, second optomechanical reflector, second aspherical lens, and TIR prism are all located within the imaging cavity shell.

[0012] This utility model also proposes a projection optical engine. In any of the above-mentioned optical systems, the optical cavity shell has a first hollowed-out groove at the position corresponding to the laser for laser beam emission. A laser shell cover is mounted on the surface of the optical cavity shell, and the surface of the laser shell cover is provided with a plurality of metal protrusions. The imaging cavity shell is assembled and fixed to the optical cavity shell. A DMD control board is mounted on one side surface of the imaging cavity shell. A digital micromirror device is welded to the side of the DMD control board near the imaging cavity shell. A second hollowed-out groove is opened on the side of the imaging cavity shell near the DMD control board, and the digital micromirror device is accommodated in the second hollowed-out groove.

[0013] To solve its technical problem, the further technical solution adopted by this utility model is as follows: Optionally, in the above-mentioned projection optical engine, the optical cavity shell is provided with a plurality of heat dissipation grooves, and the imaging cavity shell is provided with a plurality of heat dissipation ribs.

[0014] This utility model also proposes a projector, including the above-mentioned projection optical engine, which further includes an optical lens, and the optical lens is assembled and fixed to the imaging cavity shell through a lens mount.

[0015] Compared with the prior art, the present invention has the following technical effects: On the one hand, the angle between the incident and reflected rays of the laser beam combiner, the light source white light reflector, the first optical engine reflector, and the second optical engine reflector of this utility model is 90°, which can reduce the deflection error in the transmission of the laser beam. In conjunction with the first and second aspherical lenses, the laser beam can maintain better collimation when entering the subsequent optical path, providing more stable incident light for subsequent focusing and imaging. The laser beam combiner is provided with at least three sets, and each set of laser beam combiners is arranged in pairs in a "figure-eight" structure. The angle between the surface of the laser and the laser beam combiner is 45°, which can improve the beam utilization rate, combine multiple laser beams more efficiently, reduce light loss during the beam combining process, and improve the beam utilization rate. The design of the laser beam combiners being arranged in pairs in a "figure-eight" structure greatly reduces the physical distance between the optical components, enabling the optical system to achieve optical reflection and refraction in a limited space. The optical system occupies less internal space in the projection optical engine. On the other hand, the light source end of this invention, consisting of a laser, a laser combining lens, and a first aspherical lens, is located within the optical cavity shell. Meanwhile, the optical imaging components—including a white light reflector, a uniform light wheel, a light path, a first optomechanical spherical lens, a second optomechanical spherical lens, a first optomechanical reflector, a third optomechanical spherical lens, a second optomechanical reflector, a second aspherical lens, and a TIR prism—are all located within the imaging cavity shell. This arrangement, placing the optical components and the optical imaging components within the optical cavity shell and imaging cavity shell respectively, disperses the heat distribution to a certain extent, thus mitigating the heat generated by the optical components. The heat generated by the optical imaging components is separated from the heat generated by the laser, avoiding the problem of heat accumulation caused by the two components being concentrated in the same cavity shell for a short period of time, which would affect the working efficiency of the projection optical engine. The first aspherical lens can effectively correct the spherical aberration of the laser source, while the subsequent combination of multiple sets of spherical lenses, such as the first, second, and third optical engine spherical lenses, can work together to correct chromatic aberration and astigmatism. Finally, the edge image quality is further optimized by the second aspherical lens, realizing multiple aberration correction for broadband lasers in a limited space, thereby reducing the edge distortion rate of the image. Furthermore, the multi-spherical lens combination of this invention can adapt to the focusing characteristics of lasers of different wavelengths, ensuring consistent focusing accuracy of multicolor light on the imaging surface, reducing color shift, and pre-optimizing the light intensity distribution of the beam, thereby improving the initial uniformity of the beam entering the homogenizing wheel and reducing the workload of the homogenizing wheel. Moreover, placing the homogenizing wheel between the light passage and the white light reflector of the light source ensures the uniformity and smoothness of the laser beam, eliminates laser speckle, improves brightness uniformity, and alleviates color consistency issues, thus reducing the influence of laser coherence to a certain extent. The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is one of the schematic diagrams of the optical system structure according to an embodiment of the present utility model; Figure 2 This is the second schematic diagram of the optical system structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the uniform light wheel according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the TIR prism according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the optical transmission structure according to an embodiment of the present invention; Figure 6 This is one of the schematic diagrams of the assembly structure of the projection optical engine according to an embodiment of this utility model; Figure 7 This is the second schematic diagram of the assembly structure of the projection optical engine according to an embodiment of this utility model; Figure 8 This is the third schematic diagram of the assembly structure of the projection optical engine according to an embodiment of this utility model; Figure 9 This is the fourth schematic diagram of the assembly structure of the projection optical engine according to an embodiment of this utility model; Figure 10 This is a schematic diagram of the assembly structure of the projector according to an embodiment of the present utility model; The parts in the attached diagram are labeled as follows: 1. Laser, 2. Laser beam combining lens, 3. First aspherical lens, 4. Light source white light reflector, 5. Optical path, 6. First optomechanical spherical lens, 7. Second optomechanical spherical lens, 8. First optomechanical reflector, 9. Third optomechanical spherical lens, 10. Second optomechanical reflector, 11. Second aspherical lens, 12. TIR prism, 121. Triangular prism glass, 13. Beam leveling wheel, 14. Rotating motor, 15. Optical cavity shell, 151. First hollow groove, 152. Heat dissipation groove, 16. Laser-resistant anti-reflection medium film, 17. Lens mount, 18. Reflector mount, 19. Imaging cavity shell, 191. Second hollow groove, 192. Heat dissipation ribs, 20. Laser shell cover, 201. Metal protrusion, 21. DMD control board, 22. Digital micromirror device, 23. Galvanometer, 24. Optical lens and lens mount, 25. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Example 1 like Figure 1 and Figure 2 As shown in the embodiment, an optical system includes a laser 1, a laser combining lens 2, a first aspherical lens 3, a light source white light reflector 4, an optical passage 5, a first optomechanical spherical lens 6, a second optomechanical spherical lens 7, a first optomechanical reflector 8, a third optomechanical spherical lens 9, a second optomechanical reflector 10, a second aspherical lens 11, and a TIR prism 12, all arranged sequentially along the same optical path. A light-regulating wheel 13 is provided between the optical passage 5 and the light source white light reflector 4. A digital micromirror device 22 is arranged on the light-emitting side opposite to the TIR prism 12. A galvanometer 23 is provided on the side of the TIR prism 12 away from the digital micromirror device 22. The angle between the incident and reflected rays of the laser beam combiner 2, the light source white light reflector 4, the first optomechanical reflector 8, and the second optomechanical reflector 10 is 90°. At least three sets of laser beam combiners 2 are provided, and each set of laser beam combiners 2 is arranged in pairs in a figure-eight structure. The angle between the light-emitting surface of the laser 1 and the surface of the laser beam combiner 2 is 45°. The digital micromirror device 22 is also known as the DMD light-emitting chip. On the one hand, in this embodiment, the angle between the incident and reflected rays of the laser beam combiner, the light source white light reflector, the first optical engine reflector, and the second optical engine reflector is 90°, which can reduce the deflection error in the transmission of the laser beam. In conjunction with the first and second aspherical lenses, the laser beam can maintain better collimation when entering the subsequent optical path, providing more stable incident light for subsequent focusing and imaging. At least three sets of laser beam combiners are provided, and each set of laser beam combiners is arranged in pairs in a "figure-eight" structure. The angle between the surface of the laser and the laser beam combiner is 45°, which can improve the beam utilization rate, combine multiple laser beams more efficiently, reduce light loss during the beam combining process, and improve the beam utilization rate. The design of the laser beam combiners being arranged in pairs in a "figure-eight" structure greatly reduces the physical distance between the optical components, enabling the optical system to achieve optical reflection and refraction in a limited space. The optical system occupies less internal space in the projection optical engine. On the other hand, in this embodiment, the light source end, consisting of a laser, a laser combining lens, and a first aspherical lens, is located within the optical cavity shell. Meanwhile, the optical imaging components—including a white light reflector, a uniform light wheel, a light path, a first optomechanical spherical lens, a second optomechanical spherical lens, a first optomechanical reflector, a third optomechanical spherical lens, a second optomechanical reflector, a second aspherical lens, and a TIR prism—are all located within the imaging cavity shell. This arrangement, placing the optical components and the optical imaging components within the optical cavity shell and imaging cavity shell respectively, disperses the heat distribution to a certain extent, thus mitigating the heat generated by the optical components. The heat generated by the optical imaging components is separated from the heat generated by the optical imaging components, avoiding the problem of heat accumulation caused by the two being concentrated in the same cavity shell for a short time, which would affect the working efficiency of the projection optical engine. The first aspherical lens can effectively correct the spherical aberration of the laser source, while the subsequent multiple sets of spherical lenses, such as the first, second, and third optical engine spherical lenses, can work together to correct chromatic aberration and astigmatism. Finally, the edge image quality is further optimized by the second aspherical lens, realizing multiple aberration correction for broadband lasers in a limited space, thereby reducing the image edge distortion rate. Furthermore, the combination of multiple spherical lenses in this embodiment can adapt to the focusing characteristics of lasers of different wavelengths, ensuring consistent focusing accuracy of multicolor light on the imaging surface, reducing color shift, and pre-optimizing the light intensity distribution of the beam. This improves the initial uniformity of the beam entering the homogenizing wheel, reducing the workload of the homogenizing wheel. Moreover, placing the homogenizing wheel between the light passage and the white light reflector of the light source ensures the uniformity and smoothness of the laser beam, eliminates laser speckle, improves brightness uniformity, and alleviates color consistency issues, thus reducing the influence of laser coherence to a certain extent. In the above embodiments, optionally, as shown... Figure 3As shown, a rotating motor 14 is provided in the axial region of the light-diffusing wheel 13. The rotating motor 14 is fixedly mounted on the inner surface of the optical cavity shell 15. The light-diffusing wheel 13 is sleeved on the rotating shaft (not shown in the figure) of the rotating motor 14. The rotating motor 14 can drive the light-diffusing wheel 13 to rotate. In this embodiment, by driving the uniform light wheel 13 to rotate at high speed by rotating the motor 14, the problem of uneven light source can be solved, the brightness and color uniformity of the projected image can be improved, and the visual interference caused by laser speckle can be eliminated.

[0019] In the above embodiments, such as Figure 4 As shown, optionally, the TIR prism 12 is composed of two triangular prism glass 121, which are fixed by bonding at four points, and the air gap between the two triangular prism glass 121 is 0.05mm. In this embodiment, the two triangular prism glass 121 are fixed by bonding at four points, which can maintain the stability of the air gap, minimize optical interference, avoid invalid reflection of DMD, and achieve total internal reflection in the air gap, allowing only the effective reflection of DMD to be transmitted, thus reducing light loss.

[0020] In the above embodiments, optionally, as shown... Figure 5 As shown, the optical passage 5 is made of four cuboid glass blocks bonded together, and a laser-resistant anti-reflection dielectric film 16 is provided on the inner peripheral surface of the optical passage 5. In this embodiment, the laser-resistant reflective dielectric film 16 on the inner peripheral surface of the optical path 5 is structurally designed to enable efficient, low-loss, safe and stable directional transmission of high-power laser inside the projector.

[0021] In the above embodiments, optionally, as follows: Figure 5 As shown, the thickness of the laser-resistant antireflective dielectric film 16 is 420~680nm; In this embodiment, the thickness of the laser-resistant anti-reflection dielectric film 16 is selected in the range of 420~680nm, which can achieve ultra-high reflectivity, balanced heat distribution and uniform loss of the three primary colors (R, G, B primary colors), ensuring the color fidelity of laser projection and the long-term damage resistance of the light transmission 5.

[0022] In the above embodiments, optionally, as shown... Figure 1 and Figure 6 As shown, lens mounts 17 are provided on the outer periphery of the first aspherical lens 3, the first optomechanical spherical lens 6, the second optomechanical spherical lens 7, the third optomechanical spherical lens 9, and the second aspherical lens 11. Reflection mounts 18 are attached to one outer surface of the light source white light reflector 4, the first optomechanical reflector 8, and the second optomechanical reflector 10. The reflection mounts 18 and lens mounts 17 are fixedly assembled on the inner surfaces of the optical cavity shell 15 and the imaging cavity shell 19. In this embodiment, several lens mounts 17 and reflector mounts 18 are provided to provide the necessary fixed structural foundation for beam reflection, refraction and focusing, and to ensure that the beam is stably transmitted within the optical cavity shell 15 and the imaging cavity shell 19.

[0023] In the above embodiments, optionally, as follows: Figure 1 and Figure 6 As shown, the laser 1, laser beam combining lens 2, and first aspherical lens 3 are all located inside the optical cavity shell 15, and the light source white light reflector 4, uniform light wheel 13, light passage 5, first optomechanical spherical lens 6, second optomechanical spherical lens 7, first optomechanical reflector 8, third optomechanical spherical lens 9, second optomechanical reflector 10, second aspherical lens 11, and TIR prism 12 are all located inside the imaging cavity shell 19; In this embodiment, the light source component and the imaging component are placed in the optical cavity shell 15 and the imaging cavity shell 19, respectively, so that the heat during the optical transmission process can be dispersed in different cavity shells. This can avoid the problem of heat accumulating in a short time and affecting the working efficiency of the projection optical engine.

[0024] Example 2 like Figures 6 to 8 As shown, in an embodiment, a projection optical engine includes an optical system as described in any one of Embodiment 1. The optical cavity shell 15 has a first hollowed-out groove 151 at the position corresponding to the laser 1 for emitting a laser beam. A laser shell cover 20 is mounted on the surface of the optical cavity shell 15. The surface of the laser shell cover 20 is provided with a plurality of metal protrusions 201. The imaging cavity shell 19 is assembled and fixed to the optical cavity shell 15. A DMD control board 21 is mounted on one side surface of the imaging cavity shell 19. A digital micromirror device 22 is welded to the side of the DMD control board 21 near the imaging cavity shell 19. A second hollowed-out groove 191 is opened on the side of the imaging cavity shell 19 near the DMD control board 21. The digital micromirror device 22 is accommodated in the second hollowed-out groove 191. In this embodiment, the optical cavity shell 15 has a first hollowed-out groove 151 at the position corresponding to the laser source part to ensure that the laser beam is emitted without being affected by structural interference. The imaging cavity shell 19 has a second hollowed-out groove 191 on the side near the DMD control board 21. The digital micromirror device 22 is housed in the second hollowed-out groove 191, which further simplifies the overall structure of the projection optical engine and reduces its volume. The surface of the optical cavity shell 15 is equipped with a laser shell cover 20. The surface of the laser shell cover 20 is provided with a number of metal protrusions 201. Through the structural design of the number of metal protrusions 201 on the laser shell cover 20, the heat dissipation efficiency of the optical cavity shell 15 can be accelerated.

[0025] In the above embodiments, optionally, as follows: Figure 6, Figure 7 and Figure 9 As shown, the optical cavity shell 15 is provided with a plurality of heat dissipation grooves 152, and the imaging cavity shell 19 is provided with a plurality of heat dissipation ribs 192. In this embodiment, in order to further accelerate the heat conduction and heat dissipation performance of the optical cavity shell 15, several heat dissipation grooves 152 and several heat dissipation ribs 192 are provided on the optical cavity shell 15, thereby dissipating heat and cooling the projection optical engine to a greater extent and improving the working performance of the projection optical engine.

[0026] Example 3 like Figure 10 As shown, in an embodiment, a projector includes a projection optical engine as described in Embodiment 2, and the projection optical engine further includes an optical lens 24, which is assembled and fixed to the imaging cavity shell 19 via a lens mount 25. In this embodiment, the optical lens 24 and the imaging cavity shell 19 are fixedly assembled by the lens mount 25, which makes the output more stable during the projection imaging process and enhances the structural stability.

[0027] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structure made using the contents of this utility model specification and drawings, or directly or indirectly applied to other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An optical system characterized by: The system includes a laser, a laser beam combiner, a first aspherical lens, a white light reflector, a light path, a first optomechanical spherical lens, a second optomechanical spherical lens, a first optomechanical reflector, a third optomechanical spherical lens, a second optomechanical reflector, a second aspherical lens, and a TIR prism, all arranged sequentially along the same optical path. A beam equalizer is positioned between the light path and the white light reflector. A digital micromirror device is arranged on the opposite side of the TIR prism's light-emitting surface. A galvanometer is positioned on the side of the TIR prism furthest from the digital micromirror device. The angle between the incident and reflected rays of the laser beam combiner, the white light reflector, the first optomechanical reflector, and the second optomechanical reflector is 90°. At least three sets of laser beam combiners are provided, with each set arranged in pairs in a figure-eight configuration. The angle between the emitting surface of the laser and the surface of the laser beam combiner is 45°.

2. An optical system according to claim 1, characterized in that: A rotating motor is provided in the central region of the light-diffusing wheel. The rotating motor is fixedly mounted on the inner surface of the optical cavity shell. The light-diffusing wheel is sleeved on the rotating shaft of the rotating motor. The rotating motor can drive the light-diffusing wheel to rotate.

3. An optical system according to claim 1, characterized in that: The TIR prism is composed of two triangular prisms of glass, which are fixed together by four points. The air gap between the two triangular prisms is 0.05 mm.

4. An optical system according to claim 1, characterized in that: The optical path is made of four cuboid glass blocks bonded together, and a laser-resistant anti-reflection dielectric film is provided on the inner circumferential surface of the optical path.

5. An optical system according to claim 4, wherein: The thickness of the laser-resistant anti-reflection dielectric film is 420~680nm.

6. An optical system according to claim 1, characterized in that: The outer periphery of the first aspherical lens, the first optomechanical spherical lens, the second optomechanical spherical lens, the third optomechanical spherical lens, and the second aspherical lens are all provided with lens mounts. The outer surface of one side of the light source white light reflector, the first optomechanical reflector, and the second optomechanical reflector is fitted with a reflector mount. The reflector mounts and lens mounts are all fixedly assembled on the inner surface of the optical cavity shell and the imaging cavity shell.

7. An optical system according to claim 6, characterized in that: The laser, laser combining lens, and first aspherical lens are all located inside the optical cavity shell. The light source white light reflector, uniform light wheel, light passage, first optomechanical spherical lens, second optomechanical spherical lens, first optomechanical reflector, third optomechanical spherical lens, second optomechanical reflector, second aspherical lens, and TIR prism are all located inside the imaging cavity shell.

8. A projection light engine comprising the optical system of any of claims 1-7, characterized in that: The optical cavity shell has a first hollowed-out groove at the position corresponding to the laser for the laser beam to be emitted. A laser shell cover is fitted on the surface of the optical cavity shell, and the surface of the laser shell cover is provided with several metal protrusions. The imaging cavity shell is assembled and fixed to the optical cavity shell. A DMD control board is fitted on one side surface of the imaging cavity shell. A digital micromirror device is welded to the side of the DMD control board near the imaging cavity shell. A second hollowed-out groove is formed on the side of the imaging cavity shell near the DMD control board, and the digital micromirror device is accommodated in the second hollowed-out groove.

9. A projection optical engine according to claim 8, characterized in that: The optical cavity shell has several heat dissipation grooves, and the imaging cavity shell has several heat dissipation ribs.

10. A projector characterized by comprising: The projection light machine as claimed in claim 8, further comprising an optical lens fixedly assembled with the imaging cavity shell through a lens seat.

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