Optical engine and projection device

Abstract

The invention discloses an optical engine and a projection device.The optical engine comprises a laser, a first optical assembly, a fluorescent wheel, a second optical assembly, a DMD device and an imaging lens, and the side, where the incident end is located, of the imaging lens is provided with a first light path space and a second light path space; the first light path space and the second light path space are arranged side by side in the radial direction of the imaging lens, and the first optical assembly is arranged to conduct at least one time of direction changing and guiding on first light rays emitted by the laser so that the first light rays can be always kept to be transmitted in the first light path space and finally enter the fluorescent wheel; and the second optical assembly is configured to perform multiple turning guide on the second light, so that the second light is folded from transmission in the first light path space to transmission in the second light path space, and finally irradiates the DMD device to form a corresponding illumination light spot. According to the technical scheme, the structure of the whole optical engine can become more compact, so that the miniaturization design requirement of the optical engine is met.

Description

Technical Field

[0001] This application relates to the field of projection technology, and more particularly to an optical engine and a projection device. Background Technology

[0002] In existing projection display technologies, optical engines based on digital micromirror devices (DMD devices) are one of the core solutions. Their mainstream architecture typically uses laser-excited phosphors to achieve high brightness and a wide color gamut. However, in the optical path design of existing projection devices, the laser excitation path (illumination path) and the projection path processed by the DMD device are often separate or partially overlapping in a near-planar layout. This not only requires the optical engine to have a large spatial depth along the optical axis but also makes the entire optical engine structure relatively loose. All of these factors contribute to the bulky structure of the entire optical engine, making it unable to meet the requirements of miniaturization design. Summary of the Invention

[0003] The purpose of this application is to provide an optical engine and a projection device, which aims to improve the problem that the optical path design of the optical engine of the existing projection device is too planar, resulting in a bulky structure of the entire optical engine and failing to meet the requirements of its miniaturization design.

[0004] To achieve this objective, embodiments of this application provide an optical engine comprising a laser, a first optical component, a phosphor wheel, a second optical component, a DMD device, and an imaging lens. A first optical path space and a second optical path space are respectively disposed on one side of the incident end of the imaging lens, and the first optical path space and the second optical path space are arranged side-by-side in the radial direction of the imaging lens. The laser is disposed in the first optical path space and is configured to emit a first ray of light; The first optical component is disposed in the first optical path space and is configured to guide the first light beam at least once so that the first light beam is always transmitted in the first optical path space and finally incident on the fluorescent wheel; The fluorescent wheel is at least partially disposed in the first optical path space and is configured to excite the phosphor on the fluorescent wheel to obtain the second light by reflecting or transmitting the incident first light. The second optical component is partially disposed in the first optical path space and partially disposed in the second optical path space. It is configured to guide the second light beam through multiple reversals, so that the second light beam is folded from being transmitted in the first optical path space to being transmitted in the second optical path space, and finally illuminates the DMD device in a preset direction to form a corresponding illumination spot. The DMD device is disposed in the second optical path space and is configured to form a reflected projection light of the target image under the action of the illumination spot obtained by the illumination in the preset direction, and to keep the reflected projection light in the second optical path space for transmission until it is transmitted to the incident end of the imaging lens; The imaging lens is configured to image and project the reflected projection light transmitted to the incident end of the imaging lens onto the target interface.

[0005] Optionally, in some embodiments of this application, the fluorescent wheel is a reflective fluorescent wheel, and the first optical component includes a first light-diffusing device, a dichroic filter, and a first lens group, wherein... The first light homogenizing device is disposed on the light output path of the laser and is configured to homogenize the first light emitted by the laser to obtain the homogenized first light. The dichroic filter is disposed on the optical path of the first light ray after homogenization and the optical path of the second light ray after light collection, and is configured to reflect the first light ray after homogenization to the first lens group and transmit the second light ray after light collection; The first lens group includes at least one first lens, which is sequentially located between the dichroic filter and the phosphor wheel. The first first lens is configured to converge the first light reflected to the first lens group and then direct it toward the phosphor wheel. After the phosphor wheel reflects the incident first light to obtain a second light, the second light is collected to obtain a collected second light.

[0006] Optionally, in some embodiments of this application, the fluorescent wheel is provided with a first annular portion extending circumferentially thereon, the first annular portion being provided with a first phosphor, and configured to excite the first phosphor by reflecting the first light to obtain a second light of a different color from the first light; or, The fluorescent wheel is provided with a second annular portion extending circumferentially thereon. The second annular portion is divided into at least a first annular segment and a second annular segment along its extension direction. The first annular segment is provided with a first phosphor and is configured to excite the first phosphor by reflecting the first light to obtain a second light of a different color from the first light. The second annular segment is configured to reflect only the first light to obtain a second light of the same color as the first light.

[0007] Optionally, in some embodiments of this application, the fluorescent wheel is provided with a third annular portion extending circumferentially thereon, and the third annular portion is divided into at least a third annular segment, a fourth annular segment and a fifth annular segment along its extending direction; The third annular segment is provided with a second phosphor, and is configured to excite the second phosphor by reflecting the first light to obtain a second light of a different color from the first light; The fourth annular segment is provided with a third phosphor, and is configured to excite the third phosphor by reflecting the first light to obtain a second light of a different color from the first light. The fifth annular segment is configured to transmit only the first light ray, thereby obtaining a second light ray of the same color as the first light ray.

[0008] Optionally, in some embodiments of this application, the first optical component further includes a third lens, a first reflector, a second reflector, a fourth lens, and a third reflector, wherein, The third lens is disposed in the optical path of the second light ray obtained after transmission through the fifth annular segment, and is configured to collect the second light ray before directing it toward the first reflecting mirror; The first reflector is configured to reflect a second ray of light incident on the first reflector back to the second reflector; The second reflector is configured to reflect a second ray of light incident on the second reflector to the fourth lens; The fourth lens is configured to collect the second light rays reflected to the fourth lens and then direct them toward the third reflecting mirror; The third reflector is configured to reflect the second light rays incident on the third reflector to the dichroic filter, and the transmission path of the second light rays reflected by the dichroic filter after reflection from the third reflector is the same as the transmission path of the second light rays after transmission through the first lens group.

[0009] Optionally, in some embodiments of this application, the fluorescent wheel is a transmissive fluorescent wheel, and the first optical component includes a fourth reflecting mirror, a fifth reflecting mirror, a second light-diffusing device, a sixth reflecting mirror, a fifth lens, and a second lens group, wherein... The fourth reflector is disposed on the light output path of the laser and is configured to reflect the first light emitted by the laser to the fifth reflector. The fifth reflecting mirror is configured to reflect the first light rays reflected to the fifth reflecting mirror to the second light homogenizing device; The second light homogenizing device is configured to homogenize the first light reflected to the second light homogenizing device to obtain the homogenized first light. The sixth reflecting mirror is configured to reflect the first light ray after homogenization to the fifth lens; The fifth lens is configured to converge the first light rays reflected to the fifth lens and direct them toward the fluorescent wheel; The second lens group is configured to transmit the incident first light ray through the fluorescent wheel to obtain the second light ray, and then collect the second light ray to obtain the collected second light ray.

[0010] Optionally, in some embodiments of this application, the fluorescent wheel is provided with a fourth annular portion extending circumferentially thereon, the fourth annular portion being provided with a fourth phosphor, and configured to excite the fourth phosphor by transmitting the first light to obtain a second light of a different color from the first light; or, The fluorescent wheel is provided with a fifth annular portion extending circumferentially therefrom. The fifth annular portion is divided into at least a sixth annular segment and a seventh annular segment along its extension direction. The sixth annular segment is provided with a fourth phosphor and is configured to excite the fourth phosphor by transmitting the first light to obtain a second light of a different color than the first light. The seventh annular segment is configured to transmit only the first light to obtain a second light of the same color as the first light; or... The fluorescent wheel is provided with a sixth annular portion extending circumferentially therefrom, and the sixth annular portion is divided into at least an eighth annular segment, a ninth annular segment, and a tenth annular segment along its extension direction; the eighth annular segment is provided with a fifth phosphor and is configured to excite the fifth phosphor by transmitting the first light to obtain a second light of a different color from the first light; the ninth annular segment is provided with a sixth phosphor and is configured to excite the sixth phosphor by transmitting the first light to obtain a second light of a different color from the first light; the tenth annular segment is configured to transmit only the first light to obtain a second light of the same color as the first light.

[0011] Optionally, in some embodiments of this application, the second optical component includes a third homogenizing device, a sixth lens, a seventh reflecting mirror, an eighth reflecting mirror, a seventh lens, and a TIR prism, wherein... The third light-diffusing device is disposed in the optical path of the second light ray to perform light-diffusing processing on the second light ray to obtain the light-diffused second light ray; The sixth lens is positioned in the optical path of the second light ray after homogenization, and is configured to converge the second light ray after homogenization and direct it toward the seventh reflecting mirror. The seventh reflecting mirror is configured to reflect the second light rays incident on the seventh reflecting mirror to the eighth reflecting mirror; The eighth reflector is configured to reflect the second light rays incident on the eighth reflector to the seventh lens, so as to cooperate with the seventh reflector to realize the folding of the second light rays from being transmitted in the first optical path space to being transmitted in the second optical path space; The seventh lens is configured to converge the second light rays reflected to the seventh lens and direct them toward the TIR prism; The TIR prism is configured to cause the second light rays incident on the TIR prism to illuminate the DMD device in the preset direction, and after the DMD device forms the reflected projection light rays, the reflected projection light rays are transmitted to the incident end of the imaging lens without interference.

[0012] Optionally, in some embodiments of this application, the optical engine further includes a heat dissipation device, on which the laser and the DMD device are respectively disposed on one side surface facing the imaging lens, and the laser and the DMD device are arranged side by side in the radial direction of the imaging lens, such that the laser is disposed on the side of the first optical path space away from the incident end of the imaging lens, and the DMD device is disposed on the side of the second optical path space away from the incident end of the imaging lens.

[0013] In addition, to achieve this purpose, embodiments of this application also provide a projection device, which includes the optical engine of any of the above.

[0014] The optical engine and projection device provided in this application, through the aforementioned structural arrangement, utilize multiple directional guidance of the first and second optical components. This ensures stable light transmission within the corresponding optical path space while efficiently integrating all major components of the optical engine (excluding the imaging lens, including the laser, first optical component, phosphor wheel, second optical component, and DMD device) into the first and second optical path spaces arranged side-by-side radially in the imaging lens. This fully utilizes the radial space of the imaging lens, significantly shortening the total optical path length and making the entire optical engine structure more compact to meet miniaturization design requirements. Therefore, the technical solution of this application effectively addresses the problem of existing projection devices having overly planar optical path designs, resulting in a bulky structure that fails to meet miniaturization requirements. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the 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.

[0016] The structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0017] Figure 1 This is a schematic diagram of a first structural embodiment of the optical engine in this application; Figure 2 for Figure 1 A side view of a partial structure of the optical engine shown; Figure 3 for Figure 1 A top-view schematic diagram of a partial structure of the optical engine shown; Figure 4 for Figure 1 A schematic diagram of the first structure of the fluorescent wheel of the optical engine shown; Figure 5 for Figure 1 A schematic diagram of the structure of the dichroic filter of the optical engine shown; Figure 6 for Figure 1 A schematic diagram of the second structure of the fluorescent wheel of the optical engine shown; Figure 7 for Figure 1 The diagram shows a third structure of the fluorescent wheel in the optical engine. Figure 8 This is a schematic diagram of a second structure of the optical engine according to an embodiment of this application; Figure 9 This is a schematic diagram of a third structure of the optical engine according to an embodiment of this application; Figure 10 for Figure 9 A schematic diagram of the first structure of the fluorescent wheel of the optical engine shown; Figure 11 for Figure 9 A schematic diagram of the second structure of the fluorescent wheel of the optical engine shown; Figure 12 for Figure 9 The diagram shows a third structure of the fluorescent wheel in the optical engine. Figure 13 This is a schematic diagram of the heat dissipation structure of the optical engine in an embodiment of this application; Figure 14 for Figure 13 Another angle diagram of the heat dissipation structure shown.

[0018] Illustrations: 1. Optical engine; 11. First optical path space; 12. Second optical path space; 10. Laser; 20. First optical component; 211. First light-diffusing device; 212. Dichroic filter; 2121. First region; 2122. Second region; 213. First lens group; 214. Third lens; 215. First reflecting mirror; 216. Second reflecting mirror; 217. Fourth lens; 218. Third reflecting mirror; 221. Fourth reflecting mirror; 222. Fifth reflecting mirror; 223. Second light-diffusing device; 224. Sixth reflecting mirror; 225. Fifth lens; 226. Second lens group; 30. Phosphor wheel; 31. First annular portion; 32. Second annular portion; 321. 322. First annular segment; 33. Second annular segment; 33. Third annular section; 331. Third annular segment; 332. Fourth annular segment; 333. Fifth annular segment; 34. Fourth annular section; 35. Fifth annular section; 351. Sixth annular segment; 352. Seventh annular segment; 36. Sixth annular section; 361. Eighth annular segment; 362. Ninth annular segment; 363. Tenth annular segment; 40. Second optical component; 41. Third light homogenizer; 42. Sixth lens; 43. Seventh reflector; 44. Eighth reflector; 45. Seventh lens; 46. TIR prism; 50. DMD device; 60. Imaging lens; 71. Heat dissipation device; 72. Cooling fan; 73. Heat conduction device. Detailed Implementation

[0019] To make the inventive objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] In the description of this application, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component centrally located at the same time.

[0021] The technical solution of this application will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] Please see Figures 1 to 3As shown, in one embodiment, this application provides an optical engine 1, which includes a laser 10, a first optical component 20, a phosphor wheel 30, a second optical component 40, a DMD device 50, and an imaging lens 60. A first optical path space 11 and a second optical path space 12 are respectively disposed on one side of the incident end of the imaging lens 60, and the first optical path space 11 and the second optical path space 12 are arranged side-by-side in the radial direction (i.e., the X-axis direction shown in the figure) of the imaging lens 60. The laser 10 is disposed in the first optical path space 11 and is configured to emit a first light ray. The first optical component 20 is disposed in the first optical path space 11 and is configured to guide the first light ray at least once to ensure that the first light ray always remains in the first optical path space 11 and eventually enters the phosphor wheel 30. The phosphor wheel 30 is at least partially disposed in the first optical path space 11 and is configured to excite the phosphor on the phosphor wheel 30 by reflecting or transmitting the incident first light ray to obtain a second light ray. The second optical component 40 is partially disposed in the first optical path space 11 and partially disposed in the second optical path space 12. It is configured to guide the second light beam through multiple reversals, causing the second light beam to be folded from its transmission in the first optical path space 11 to its transmission in the second optical path space 12, and finally irradiate the DMD device 50 in a preset direction, forming a corresponding illumination spot. The DMD device 50 is disposed in the second optical path space 12 and is configured to form a reflected projection light beam of the target image under the action of the illumination spot obtained from the preset direction of illumination, and to maintain the reflected projection light beam in the second optical path space 12 until it reaches the incident end of the imaging lens 60. The imaging lens 60 is configured to image and project the reflected projection light beam transmitted to the incident end of the imaging lens 60 onto the target interface.

[0023] It should be noted that the optical engine 1 in this embodiment is mainly used in a projection device to realize the projection function of the projection device. That is, after the laser 10 emits a first light beam, it can be guided by the first optical component 20 at least once to keep the first light beam transmitted in the first optical path space 11 and finally incident on the phosphor wheel 30. Then, it is reflected or transmitted through the phosphor wheel 30 to excite the phosphor on the phosphor wheel 30 to obtain a second light beam, which can then serve as the light source output of the entire optical engine 1. At this time, the second light beam, which serves as the light source output, can be guided by the second optical component multiple times to fold from transmission in the first optical path space 11 to transmission in the second optical path space 12, and finally illuminate the DMD device 50 in a preset direction to form a corresponding illumination spot. Finally, the DMD device 50 can form a reflected projection light beam of the target image under the action of the illumination spot, and transmit the reflected projection light beam to the incident end of the imaging lens 60 so that the imaging lens 60 can image and project the reflected projection light beam onto the target interface, thereby realizing the projection function of the corresponding projection device.

[0024] The laser 10 mentioned above is generally a blue laser 10, which can emit a first ray of blue light.

[0025] The aforementioned requirement that a certain ray (such as the first ray or part of the second ray) always remain in the first optical path space 11 specifically means that no matter how the transmission optical path of that ray changes direction, it always remains parallel to the plane containing the YZ axis shown in the figure, and always remains within the first optical path space 11. Figure 2 The light ray (such as a portion of the second ray or a reflected projection ray) is transmitted within the first optical path space 11 shown. Similarly, the aforementioned requirement that a certain ray (such as a portion of the second ray or a reflected projection ray) always be transmitted within the second optical path space 12 specifically means that no matter how the transmission path of that ray changes direction, it always remains parallel to the plane containing the YZ axis shown in the figure, and always remains within the second optical path space 12. Figure 2 Transmission occurs in the second optical path space 12 shown. In this way, two layers of optical paths can be formed for layered transmission in the X-axis direction.

[0026] Furthermore, the aforementioned DMD device 50 generally includes a DMD chip and a DMD driver board. The DMD chip is a microelectromechanical system (MEMS) chip with millions (e.g., 2.07 million for 1080p and 8.3 million for 4K) tiny square aluminum mirrors on its surface, each representing a pixel. Each micromirror can be rapidly flipped between two states (e.g., ±12° or ±17°) driven by an electrical signal. When it is in the "on" state, the micromirror reflects light through a projection lens and projects it onto the screen, making the pixel appear "bright". When it is in the "off" state, the micromirror reflects light to a light absorber (a black cavity), where the light is absorbed, making the pixel appear "dark". The DMD driver board receives video signals from the motherboard and precisely controls the flipping state and duration of each micromirror.

[0027] In this way, the optical engine 1 of this application embodiment, through the above-described structural configuration, utilizes the multiple directional guidance of the first optical component 20 and the second optical component 40 to ensure stable transmission of light within the corresponding optical path space. At the same time, it efficiently integrates the other main components (including the laser 10, the first optical component 20, the phosphor wheel 30, the second optical component 40, and the DMD device 50) arranged side by side in the radial direction of the imaging lens 60 into the first optical path space 11 and the second optical path space 12. This achieves full utilization of the radial space of the imaging lens 60, significantly shortening its total optical path length while making the overall structure more compact to meet its miniaturization design requirements.

[0028] In some examples, such as Figures 1 to 3As shown, the aforementioned phosphor wheel 30 can specifically be a reflective phosphor wheel 30. In this case, the first optical component 20 can specifically include a first light homogenizing device 211, a dichroic filter 212, and a first lens group 213. The first light homogenizing device 211 is disposed on the light output path of the laser 10 and is configured to homogenize the first light emitted from the laser 10 to obtain homogenized first light. The dichroic filter 212 is disposed on the optical path of the homogenized first light and the optical path of the collected second light, and is configured to reflect the homogenized first light to the first lens group 213 and transmit the collected second light. The first lens group 213 includes at least one first lens, which is sequentially located between the dichroic filter 212 and the phosphor wheel 30. It is configured to converge the first light reflected to the first lens group 213 before directing it toward the phosphor wheel 30, and to collect the second light after the phosphor wheel 30 reflects the incident first light to obtain the collected second light. Thus, with the above structural arrangement, the orientation of the incident surface of the reflective phosphor wheel 30 can be coordinated so that the first light emitted by the laser 10 can be directed downwards at least once by the first optical component 20, and while always being transmitted in the first optical path space 11, it will eventually be incident on the incident surface of the reflective phosphor wheel 30.

[0029] It should be noted that, in this example, the first lens group 213 preferably has two first lenses. In this example, the first homogenizing device 211, the dichroic filter 212, and the first lens group 213 are preferably located in... Figure 3 The layout is arranged in the YZ axis plane shown. In this example, the dichroic color plate 212 is preferably set at a 45-degree angle to the plane containing the XZ axis shown in the figure.

[0030] In some examples, such as Figure 4 As shown, the phosphor wheel 30 is provided with a first annular portion 31 extending circumferentially thereon. The first annular portion 31 is provided with a first phosphor and is configured to excite the first phosphor by reflecting a first light ray to obtain a second light ray of a different color from the first light ray. In this way, with the above structural configuration, a monochromatic segment scheme can be formed, so that only a second light ray of a different color from the first light ray is incident on the dichroic filter 212 through the first lens group 213 to serve as the light source output of the entire optical engine 1, thereby meeting the corresponding light source output requirements.

[0031] It should be noted that, in order to improve heat dissipation of the phosphor, the first annular portion 31 in this example is generally configured to rotate under the drive of a rotating motor, thereby changing the position where the first light irradiates the first annular portion 31 and reducing the heat power per unit area on the first phosphor. Furthermore, as described above, the laser 10 is generally a blue laser 10, which can correspondingly emit a first light beam of blue color. Therefore, the first phosphor in this example is preferably configured to reflect a second light beam of yellow color when excited by the first light beam; that is, when the first light beam is irradiated at different positions of the first annular portion 31, a second light beam of yellow color can be obtained to meet the corresponding light output requirements of the light source. At this time, as... Figure 5 As shown, the dichroic filter 212 may specifically include a first region 2121 and a second region 2122 surrounding the first region 2121. The first region 2121 is configured to reflect blue light and transmit yellow light, such that when a first ray of light is incident on the dichroic filter 212, it can be reflected by the dichroic filter 212 and sequentially directed towards the first lens group 213 and the phosphor wheel 30. When a second ray of light is incident on the dichroic filter 212, it can pass through the dichroic filter 212 without obstruction due to the transmission effect of the dichroic filter 212, thus serving as the light source output. The second region 2122 is configured as an antireflective coating for the visible light band.

[0032] In some examples, such as Figure 6 As shown, the phosphor wheel 30 is provided with a second annular portion 32 extending circumferentially therefrom. The second annular portion 32 is divided into at least a first annular segment 321 and a second annular segment 322 along its extension direction. The first annular segment 321 is provided with a first phosphor and is configured to excite the first phosphor by reflecting a first light ray to obtain a second light ray of a different color than the first light ray. The second annular segment 322 is configured to reflect only the first light ray to obtain a second light ray of the same color as the first light ray. In this way, with the above structural configuration, a multi-color segment scheme can be formed, so that the second light ray including at least two different colors is directed through the first lens group 213 to the dichroic filter 212 as the light source output of the entire optical engine 1 to meet the corresponding light source output requirements.

[0033] It should be noted that, in order to improve the heat dissipation of the phosphor, the second annular portion 32 in this example is generally configured to rotate under the drive of a rotating motor. This changes the position where the first light irradiates the second annular portion 32, thereby reducing the heat power per unit area on the first phosphor. Simultaneously, it allows the first light to irradiate the first annular segment 321 and the second annular segment 322 respectively, resulting in reflections of second light of different colors. Furthermore, as described above, the laser 10 is generally a blue laser 10, which can correspondingly emit blue light as the first light. Meanwhile, the first phosphor in this example is preferably configured to reflect yellow light as the second light when excited by the first light. Therefore, when the first light irradiates different positions on the first annular segment 321, yellow light is obtained as the second light; when the first light irradiates different positions on the second annular segment 322, blue light is obtained as the second light. When the yellow and blue second light rays are successively irradiated by the dichroic filter 212, they can be mixed to obtain white light as the second light, thus meeting the corresponding light output requirements of the light source. At this time, the first region 2121 of the aforementioned dichroic filter 212 should be reset to reflect one polarization state (such as S polarization state) blue light and transmit another polarization state (such as P polarization state) blue light and yellow light. This allows the first light ray to be reflected by the dichroic filter 212 and then sequentially directed towards the first lens group 213 and the phosphor wheel 30. Meanwhile, the second light ray (including yellow light and blue light) can pass through the dichroic filter 212 without obstruction and serve as the light source output when it is reflected by the dichroic filter 212.

[0034] In some examples, such as Figure 7 As shown, the phosphor wheel 30 is provided with a third annular portion 33 extending circumferentially therefrom. The third annular portion 33 is divided into at least a third annular segment 331, a fourth annular segment 332, and a fifth annular segment 333 along its extension direction. The third annular segment 331 is provided with a second phosphor and is configured to excite the second phosphor by reflecting a first light ray to obtain a second light ray of a different color than the first light ray. The fourth annular segment 332 is provided with a third phosphor and is configured to excite the third phosphor by reflecting a first light ray to obtain a second light ray of a different color than the first light ray. The fifth annular segment 333 is configured to transmit only the first light ray to obtain a second light ray of the same color as the first light ray. In this way, with the above structural configuration, a multi-color segment scheme can also be formed, so that second light rays including at least two different colors are directed through the first lens group 213 to the dichroic filter 212 to serve as the light source output of the entire optical engine 1, thereby meeting the corresponding light source output requirements.

[0035] It should be noted that, in order to improve heat dissipation of the phosphor, the third annular portion 33 in this example is generally configured to rotate under the drive of a rotating motor. This changes the position where the first light irradiates the third annular portion 33, thereby reducing the heat power per unit area on the second and third phosphors. Simultaneously, it allows the first light to irradiate the third annular segment 331, the fourth annular segment 332, and the fifth annular segment 333 respectively, reflecting or transmitting second light of different colors. Furthermore, as described above, the laser 10 is generally a blue laser 10, which can correspondingly emit blue first light. Meanwhile, the second phosphor in this example is preferably configured to reflect red second light when excited by the first light. The third phosphor in this example is preferably configured to reflect green second light when excited by the first light. Therefore, when the first ray is directed to different positions of the third annular segment 331, a second ray of red color is obtained; when the first ray is directed to different positions of the fourth annular segment 332, a second ray of green color is obtained; and when the first ray is directed to different positions of the fifth annular segment 333, a second ray of blue color is obtained. Since the second ray of blue color is obtained by transmitting through the fifth annular segment 333, its emission direction is different from that of the second rays of other colors (red and green light) (generally they are set opposite). Therefore, it needs to be guided by a mirror, as described later, to redirect its emission direction to be the same as that of the second rays of other colors (red and green light). In this way, sequential colored rays can be synthesized to serve as the light source output of the entire optical engine 1 to meet the corresponding light source output requirements. At this time, the first region 2121 of the aforementioned dichroic filter 212 should be reset to reflect blue light and transmit red and green light, so that when the first light rays are incident on the dichroic filter 212, they can be incident on the first lens group 213 and the phosphor wheel 30 in sequence under the reflection of the dichroic filter 212. When the second light rays of red and green light rays are incident on the dichroic filter 212, they can pass through the dichroic filter 212 without obstruction under the transmission of the dichroic filter 212, so as to combine with the reflected light of the second light rays of blue light rays to synthesize sequential colored light rays, which can be used as the light source output of the entire optical engine 1.

[0036] In some examples, such as Figure 8As shown, the first optical component 20 further includes a third lens 214, a first reflector 215, a second reflector 216, a fourth lens 217, and a third reflector 218. The third lens 214 is positioned on the optical path of the second light ray obtained after transmission through the fifth annular segment 333, and is configured to collect the second light ray before directing it toward the first reflector 215. The first reflector 215 is configured to reflect the second light ray incident on it to the second reflector 216. The second reflector 216 is configured to reflect the second light ray incident on it to the fourth lens 217. The fourth lens 217 is configured to collect the second light ray reflected to it and then direct it toward the third reflector 218. The third reflector 218 is configured to reflect the second light rays incident on it to the dichroic filter 212, and the transmission path of the second light rays reflected from the third reflector 218 by the dichroic filter 212 is the same as the transmission path of the second light rays after they have been received by the first lens group 213. Thus, with this structural configuration, the blue light ray, while maintaining its transmission in the first optical path space 11, can have its emission direction redirected to be the same as that of other colors (red and green), thereby combining with the other colors (red and green) to synthesize sequential colored light rays as the light source output of the entire optical engine 1, meeting the corresponding light source output requirements.

[0037] It should be noted that, in this example, the third lens 214, the first reflecting mirror 215, the second reflecting mirror 216, the fourth lens 217, and the third reflecting mirror 218 are preferably in... Figure 8 The YZ-axis plane shown is arranged in a layout. In this example, the first reflector 215 and the third reflector 218 are preferably arranged at a 45-degree angle to the plane containing the XZ-axis shown in the figure. In this example, the second reflector 216 is preferably arranged at a 135-degree angle to the plane containing the XZ-axis shown in the figure.

[0038] In some examples, such as Figure 9As shown, the aforementioned fluorescent wheel 30 can also be a transmissive fluorescent wheel 30. The first optical component 20 includes a fourth reflecting mirror 221, a fifth reflecting mirror 222, a second homogenizing device 223, a sixth reflecting mirror 224, a fifth lens 225, and a second lens group 226. The fourth reflecting mirror 221 is positioned on the light-emitting path of the laser 10 and is configured to reflect the first light emitted from the laser 10 to the fifth reflecting mirror 222. The fifth reflecting mirror 222 is configured to reflect the first light reflected to the fifth reflecting mirror 222 to the second homogenizing device. The second homogenizing device 223 is configured to homogenize the first light reflected to the second homogenizing device 223 to obtain homogenized first light. The sixth reflecting mirror 224 is configured to reflect the homogenized first light to the fifth lens 225. The fifth lens 225 is configured to converge the first light reflected to the fifth lens 225 and direct it toward the fluorescent wheel 30. The second lens group 226 is configured to transmit the incident first light beam through the phosphor wheel 30 to obtain the second light beam, and then collect the second light beam to obtain the collected second light beam. Thus, with the above structural configuration, and in conjunction with the orientation of the incident surface of the transmissive phosphor wheel 30, the first light beam emitted by the laser 10 can be effectively directed downwards during at least one reversal of the first optical component 20, maintaining its transmission within the first optical path space 11, and ultimately incident on the incident surface of the transmissive phosphor wheel 30.

[0039] It should be noted that, in this example, the second lens group 226 is preferably provided with two second lenses. In this example, the fourth reflecting mirror 221, the fifth reflecting mirror 222, the second light-diffusing device 223, the sixth reflecting mirror 224, the fifth lens 225, and the second lens group 226 are preferably arranged in... Figure 9 The YZ-axis plane shown is arranged in the layout. In this example, the fourth reflector 221 and the sixth reflector 224 are preferably arranged at a 45-degree angle to the plane containing the XZ-axis shown in the figure. In this example, the fifth reflector 222 is preferably arranged at a 135-degree angle to the plane containing the XZ-axis shown in the figure.

[0040] In some examples, such as Figure 10 As shown, the phosphor wheel 30 is provided with a fourth annular portion 34 extending circumferentially thereon. The fourth annular portion 34 is provided with a fourth phosphor and is configured to excite the fourth phosphor by transmitting a first light ray, thereby obtaining a second light ray of a different color from the first light ray. In this way, with the above structural configuration, a monochromatic segment scheme can be formed, so that only a second light ray of a different color from the first light ray is emitted through the second lens group 226 to serve as the light source output of the entire optical engine 1, thereby meeting the corresponding light source output requirements.

[0041] It should be noted that, in order to improve the heat dissipation of the phosphor, the fourth annular portion 34 in this example is generally configured to rotate under the drive of a rotating motor, thereby changing the position where the first light irradiates the first annular portion 31 and reducing the heat power per unit area on the fourth phosphor. Furthermore, as described above, the laser 10 is generally a blue laser 10, which can emit a first light beam of blue color. Therefore, the fourth phosphor in this example is preferably configured to transmit a second light beam of yellow color when excited by the first light beam. That is, when the first light beam strikes different positions of the fourth annular portion 34, the fourth phosphor can be excited to obtain a second light beam of yellow color. Simultaneously, since some unabsorbed blue light beams of the first light beam will be directly transmitted, they will mix with the yellow light beam of the second light beam to ultimately produce a second light beam of white color, thus meeting the corresponding light output requirements of the light source.

[0042] In some examples, such as Figure 11 As shown, the phosphor wheel 30 is provided with a fifth annular portion 35 extending circumferentially therefrom. The fifth annular portion 35 is divided into at least a sixth annular segment 351 and a seventh annular segment 352 along its extension direction. The sixth annular segment 351 is provided with a fourth phosphor and is configured to excite the fourth phosphor by transmitting a first light to obtain a second light of a different color from the first light. The seventh annular segment 352 is configured to transmit only the first light to obtain a second light of the same color as the first light. In this way, with the above structural configuration, a multi-color segment scheme can be formed, so that the second light including at least two different colors is emitted through the second lens group 226 as the light source output of the entire optical engine 1 to meet the corresponding light source output requirements.

[0043] It should be noted that, in order to improve the heat dissipation of the phosphor, the fifth annular portion 35 in this example is generally configured to rotate under the drive of a rotating motor, thereby changing the position where the first light irradiates the fifth annular portion 35. This reduces the heat power per unit area on the fourth phosphor and allows the first light to irradiate the sixth annular segment 351 and the seventh annular segment 352 respectively, thus transmitting second light of different colors. Furthermore, as described above, the laser 10 is generally a blue laser 10, which can correspondingly emit a blue first light. Simultaneously, the fourth phosphor in this example is preferably configured to transmit a yellow second light when excited by the first light. Therefore, when the first light irradiates different positions on the sixth annular segment 351, a yellow second light is obtained; and when the first light irradiates different positions on the second annular segment 322, a blue second light is obtained. When the yellow and blue second lights are emitted sequentially through the second lens group 226, they can be mixed to obtain a white second light, thus meeting the corresponding light output requirements of the light source.

[0044] In some examples, such as Figure 12 As shown, the phosphor wheel 30 is provided with a sixth annular portion 36 extending circumferentially therefrom. The sixth annular portion 36 is divided into at least an eighth annular segment 361, a ninth annular segment 362, and a tenth annular segment 363 along its extension direction. The eighth annular segment 361 is provided with a fifth phosphor and is configured to excite the fifth phosphor by transmitting a first light ray to obtain a second light ray of a different color than the first light ray. The ninth annular segment 362 is provided with a sixth phosphor and is configured to excite the sixth phosphor by transmitting a first light ray to obtain a second light ray of a different color than the first light ray. The tenth annular segment 363 is configured to transmit only the first light ray to obtain a second light ray of the same color as the first light ray. In this way, with the above structural configuration, a multi-color segment scheme can also be formed, so that at least three different colors of second light ray are emitted outward through the second lens group 226 to serve as the light source output of the entire optical engine 1, so as to meet the corresponding light source output requirements.

[0045] It should be noted that, in order to improve heat dissipation of the phosphor, the sixth annular portion 36 in this example is generally configured to rotate under the drive of a rotating motor. This changes the position where the first light irradiates the sixth annular portion 36, thereby reducing the heat power per unit area on the fifth and sixth phosphors. Simultaneously, it allows the first light to irradiate the eighth annular segment 361, the ninth annular segment 362, and the tenth annular segment 363 respectively, thus transmitting second light of different colors. Furthermore, as described above, the laser 10 is generally a blue laser 10, which can correspondingly emit blue first light. Meanwhile, the fifth phosphor in this example is preferably configured to transmit red second light when excited by the first light. The sixth phosphor in this example is preferably configured to transmit green second light when excited by the first light. Therefore, when the first ray is directed to different positions on the eighth annular segment 361, a second ray of red color is obtained; when the first ray is directed to different positions on the ninth annular segment 362, a second ray of green color is obtained; and when the first ray is directed to different positions on the tenth annular segment 363, a second ray of blue color is obtained. In this way, sequentially colored rays can be synthesized to serve as the light source output of the entire optical engine 1, thereby meeting the corresponding light source output requirements.

[0046] In some examples, such as Figure 1 , Figure 2 , Figure 8 and Figure 9As shown, the aforementioned second optical component 40 may specifically include a third homogenizing device 41, a sixth lens 42, a seventh reflecting mirror 43, an eighth reflecting mirror 44, a seventh lens 45, and a TIR prism 46. The third homogenizing device 41 is disposed in the optical path of the second light ray to homogenize it, resulting in a homogenized second light ray. The sixth lens 42 is disposed in the optical path of the homogenized second light ray, configured to converge the homogenized second light ray before directing it toward the seventh reflecting mirror 43. The seventh reflecting mirror 43 is configured to reflect the second light ray incident on it to the eighth reflecting mirror 44. The eighth reflecting mirror 44 is configured to reflect the second light ray incident on it to the seventh lens 45, thereby cooperating with the seventh reflecting mirror 43 to fold the second light ray from transmission in the first optical path space 11 to transmission in the second optical path space 12. The seventh lens 45 is configured to converge the second light ray reflected to it before directing it toward the TIR prism 46. The TIR prism 46 is configured to direct the second light ray incident on the TIR prism 46 to illuminate the DMD device 50 in a preset direction. After the DMD device 50 forms a reflected projection light ray, the reflected projection light ray is transmitted to the incident end of the imaging lens 60 without interference. In this way, through the above structural configuration, the second light ray can be effectively guided by multiple reversals, so that the second light ray is folded from its transmission in the first optical path space 11 to its transmission in the second optical path space 12, and finally illuminates the DMD device 50 in a preset direction to form a corresponding illumination spot.

[0047] It should be noted that, in this example, the seventh reflecting mirror 43 is preferably configured to be aligned with... Figure 2The plane containing the YZ axes shown is set at a 135-degree angle. In this example, the short half-angle θH and long half-angle θL of the light emitted from the third homogenizing device 41 must satisfy: 3.5° < θH < 5°, 6° < θL < 8°. Since the angular distribution of the second light ray emitted from the third homogenizing device 41 is a rectangle, that is, the cross-section of the far-field second light ray is a rectangle, the aforementioned short half-angle θH describes the opening angle of this second light ray in the height direction (short side), and the aforementioned long half-angle θL describes the opening angle of this second light ray in the width direction (long side). In this way, by using the above angles, it can be ensured that the light can pass smoothly through all optical and mechanical components without excessive loss, and that the illumination spot has sufficient uniformity on the DMD device 50, ultimately achieving the product design goal of "small size" and "performance compliance". In this example, the TIR prism 46 physically separates the illumination path (the path where the second ray shines on the DMD device 50 after passing through the TIR lens) from the projection path (the path where the projected ray is reflected) and efficiently guides the light. This is because the DMD device 50 is a reflective chip. The main illumination ray needs to be incident on the surface of the DMD device 50 at a specific angle (usually ±24° or ±34°). After being modulated by the DMD device 50, the light in the "on" state (the light that forms the image, i.e., the reflected projection ray) will be reflected out at another symmetrical angle. When the TIR prism 46 is not set here, the illumination path and the projection lens will "interfere" with each other, that is, the imaging lens 60 will directly block the incident illumination ray. However, when the TIR prism 46 is set here, the TIR prism 46 will use the principle of total internal reflection to create a light path "fork" inside the prism. It allows illumination light to enter from one side at a larger angle and illuminate the DMD device 50, while allowing the "on" state light reflected back from the DMD device 50 to enter the imaging lens 60 on the other side at a smaller angle.

[0048] In some examples, such as Figure 13 and Figure 14 As shown, the optical engine 1 also includes a heat dissipation device 71. A laser 10 and a DMD device 50 are respectively disposed on the surface of the heat dissipation device 71 facing the imaging lens 60. The laser 10 and the DMD device 50 are arranged side-by-side in the radial direction of the imaging lens 60, such that the laser 10 is located on the side of the first optical path space 11 away from the incident end of the imaging lens 60, and the DMD device 50 is located on the side of the second optical path space 12 away from the incident end of the imaging lens 60. Thus, through the above structural arrangement, a design is formed in which the laser 10 and the DMD device 50 share the same heat dissipation device 71, further simplifying the structure of the optical engine 1 and further meeting its miniaturization design requirements.

[0049] It should be noted that the optical engine 1 in this example also includes a cooling fan 72. The exhaust direction of the cooling fan 72 is directed towards the surface of the heat sink 71 away from the imaging lens 60, thereby enhancing the heat dissipation capacity of the heat sink 71. Furthermore, in this example, the phosphor wheel 30, in addition to being partially located in the first optical path space 11, can also be partially located in the second optical path space 12, sharing the thickness of the two optical path spaces to reduce the overall thickness of the optical engine 1 (i.e.,...). Figure 3 (The length in the X-axis direction is shown). Furthermore, a heat-conducting device 73 can be provided on one side of the phosphor wheel 30. At the same time, one end of the heat-conducting device 73 can be fixedly provided on the surface of the heat dissipation device 71 away from the imaging lens 60. In this way, the structure design of the laser 10, DMD device 50 and phosphor wheel 30 sharing the same heat dissipation device 71 can be realized, which further simplifies the structure of the optical engine 1 and further meets its miniaturization design requirements.

[0050] In one embodiment, this application also provides a projection device, which includes the optical engine 1 described in the above embodiment. Therefore, since the projection device of this application uses the optical engine 1 described in the above embodiment, it can achieve the same technical effects as the optical engine 1 described above, and will not be described again here.

[0051] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An optical engine, characterized in that, The optical engine includes a laser, a first optical component, a phosphor wheel, a second optical component, a DMD device, and an imaging lens. A first optical path space and a second optical path space are respectively provided on one side of the imaging lens where the incident end is located, and the first optical path space and the second optical path space are arranged side-by-side in the radial direction of the imaging lens. The laser is disposed in the first optical path space and is configured to emit a first ray of light; The first optical component is disposed in the first optical path space and is configured to guide the first light beam at least once so that the first light beam is always transmitted in the first optical path space and finally incident on the fluorescent wheel; The fluorescent wheel is at least partially disposed in the first optical path space and is configured to excite the phosphor on the fluorescent wheel to obtain the second light by reflecting or transmitting the incident first light. The second optical component is partially disposed in the first optical path space and partially disposed in the second optical path space. It is configured to guide the second light beam through multiple reversals, so that the second light beam is folded from being transmitted in the first optical path space to being transmitted in the second optical path space, and finally illuminates the DMD device in a preset direction to form a corresponding illumination spot. The DMD device is disposed in the second optical path space and is configured to form a reflected projection light of the target image under the action of the illumination spot obtained by the illumination in the preset direction, and to keep the reflected projection light in the second optical path space for transmission until it is transmitted to the incident end of the imaging lens; The imaging lens is configured to image and project the reflected projection light transmitted to the incident end of the imaging lens onto the target interface.

2. The optical engine according to claim 1, characterized in that, The fluorescent wheel is a reflective fluorescent wheel, and the first optical component includes a first light-diffusing device, a dichroic filter, and a first lens group, wherein... The first light homogenizing device is disposed on the light output path of the laser and is configured to homogenize the first light emitted by the laser to obtain the homogenized first light. The dichroic filter is disposed on the optical path of the first light ray after homogenization and the optical path of the second light ray after light collection, and is configured to reflect the first light ray after homogenization to the first lens group and transmit the second light ray after light collection; The first lens group includes at least one first lens, which is sequentially located between the dichroic filter and the phosphor wheel. The first first lens is configured to converge the first light reflected to the first lens group and then direct it toward the phosphor wheel. After the phosphor wheel reflects the incident first light to obtain a second light, the second light is collected to obtain a collected second light.

3. The optical engine according to claim 2, characterized in that, The fluorescent wheel is provided with a first annular portion extending circumferentially therefrom, the first annular portion being provided with a first phosphor, and configured to excite the first phosphor by reflecting the first light to obtain a second light of a different color from the first light; or, The fluorescent wheel is provided with a second annular portion extending circumferentially thereon. The second annular portion is divided into at least a first annular segment and a second annular segment along its extension direction. The first annular segment is provided with a first phosphor and is configured to excite the first phosphor by reflecting the first light to obtain a second light of a different color from the first light. The second annular segment is configured to reflect only the first light to obtain a second light of the same color as the first light.

4. The optical engine according to claim 2, characterized in that, The fluorescent wheel is provided with a third annular portion extending circumferentially thereon, and the third annular portion is divided into at least a third annular segment, a fourth annular segment and a fifth annular segment along its extension direction. The third annular segment is provided with a second phosphor, and is configured to excite the second phosphor by reflecting the first light to obtain a second light of a different color from the first light; The fourth annular segment is provided with a third phosphor, and is configured to excite the third phosphor by reflecting the first light to obtain a second light of a different color from the first light. The fifth annular segment is configured to transmit only the first light ray, thereby obtaining a second light ray of the same color as the first light ray.

5. The optical engine according to claim 4, characterized in that, The first optical component further includes a third lens, a first reflector, a second reflector, a fourth lens, and a third reflector, wherein, The third lens is disposed in the optical path of the second light ray obtained after transmission through the fifth annular segment, and is configured to collect the second light ray before directing it toward the first reflecting mirror; The first reflector is configured to reflect a second ray of light incident on the first reflector back to the second reflector; The second reflector is configured to reflect a second ray of light incident on the second reflector to the fourth lens; The fourth lens is configured to collect the second light rays reflected to the fourth lens and then direct them toward the third reflecting mirror; The third reflector is configured to reflect the second light rays incident on the third reflector to the dichroic filter, and the transmission path of the second light rays reflected by the dichroic filter after reflection from the third reflector is the same as the transmission path of the second light rays after transmission through the first lens group.

6. The optical engine according to claim 1, characterized in that, The fluorescent wheel is a transmissive fluorescent wheel. The first optical component includes a fourth reflecting mirror, a fifth reflecting mirror, a second light-diffusing device, a sixth reflecting mirror, a fifth lens, and a second lens group. The fourth reflector is disposed on the light output path of the laser and is configured to reflect the first light emitted by the laser to the fifth reflector. The fifth reflecting mirror is configured to reflect the first light rays reflected to the fifth reflecting mirror to the second light homogenizing device; The second light homogenizing device is configured to homogenize the first light reflected to the second light homogenizing device to obtain the homogenized first light. The sixth reflecting mirror is configured to reflect the first light ray after homogenization to the fifth lens; The fifth lens is configured to converge the first light rays reflected to the fifth lens and direct them toward the fluorescent wheel; The second lens group is configured to transmit the incident first light ray through the fluorescent wheel to obtain the second light ray, and then collect the second light ray to obtain the collected second light ray.

7. The optical engine according to claim 6, characterized in that, The fluorescent wheel is provided with a fourth annular portion extending circumferentially therefrom, the fourth annular portion being provided with a fourth phosphor, and configured to excite the fourth phosphor by transmitting the first light to obtain a second light of a different color from the first light; or, The fluorescent wheel is provided with a fifth annular portion extending circumferentially therefrom. The fifth annular portion is divided into at least a sixth annular segment and a seventh annular segment along its extension direction. The sixth annular segment is provided with a fourth phosphor and is configured to excite the fourth phosphor by transmitting the first light to obtain a second light of a different color than the first light. The seventh annular segment is configured to transmit only the first light to obtain a second light of the same color as the first light; or... The fluorescent wheel is provided with a sixth annular portion extending circumferentially therefrom, and the sixth annular portion is divided into at least an eighth annular segment, a ninth annular segment, and a tenth annular segment along its extension direction; the eighth annular segment is provided with a fifth phosphor and is configured to excite the fifth phosphor by transmitting the first light to obtain a second light of a different color from the first light; the ninth annular segment is provided with a sixth phosphor and is configured to excite the sixth phosphor by transmitting the first light to obtain a second light of a different color from the first light; the tenth annular segment is configured to transmit only the first light to obtain a second light of the same color as the first light.

8. The optical engine according to claim 1, characterized in that, The second optical component includes a third homogenizing device, a sixth lens, a seventh reflecting mirror, an eighth reflecting mirror, a seventh lens, and a TIR prism, wherein, The third light-diffusing device is disposed in the optical path of the second light ray to perform light-diffusing processing on the second light ray to obtain the light-diffused second light ray; The sixth lens is positioned in the optical path of the second light ray after homogenization, and is configured to converge the second light ray after homogenization and direct it toward the seventh reflecting mirror. The seventh reflecting mirror is configured to reflect the second light rays incident on the seventh reflecting mirror to the eighth reflecting mirror; The eighth reflector is configured to reflect the second light rays incident on the eighth reflector to the seventh lens, so as to cooperate with the seventh reflector to realize the folding of the second light rays from being transmitted in the first optical path space to being transmitted in the second optical path space; The seventh lens is configured to converge the second light rays reflected to the seventh lens and then direct them toward the TIR prism; the TIR prism is configured to direct the second light rays directed toward the TIR prism to illuminate the DMD device in the preset direction, and after the DMD device forms the reflected projection light rays, to allow the reflected projection light rays to be transmitted to the incident end of the imaging lens without interference.

9. The optical engine according to any one of claims 1-8, characterized in that, The optical engine further includes a heat dissipation device. The laser and the DMD device are respectively disposed on one side surface of the heat dissipation device facing the imaging lens. The laser and the DMD device are arranged side by side in the radial direction of the imaging lens, such that the laser is disposed on the side of the first optical path space away from the incident end of the imaging lens, and the DMD device is disposed on the side of the second optical path space away from the incident end of the imaging lens.

10. A projection device, characterized in that, The projection device includes an optical engine as described in any one of claims 1-9.

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