Projection light source system and projection apparatus

Abstract

A projection light source system (100) and a projection apparatus (1000). The projection light source system (100) is applied to a projection apparatus (1000) comprising a display chip (900). The projection light source system (100) comprises a light source module (10), a light guide system (20), a fluorescent color wheel (30) and a light-reflecting member (40). The light source module (10) emits a laser beam; the light guide system (20) is arranged on the optical path of the laser beam and transmits the laser beam to the fluorescent color wheel (30); the fluorescent color wheel (30) comprises a plurality of fluorescence excitation regions (31) having different colors, and the plurality of fluorescence excitation regions (31) sequentially receive the laser beam and reflect an illumination beam; the light-reflecting member (40) is arranged opposite the fluorescent color wheel (30), and the light guide system (20) is located between the fluorescent color wheel (30) and the light-reflecting member (40), such that the illumination beam and the laser beam have an overlapped portion; and the light-reflecting member (40) reflects the illumination beam to the display chip (900). In the projection light source system (100), the fluorescent color wheel (30) and the light-reflecting member (40) are oppositely spaced apart from each other, and the light guide system (20) is arranged between the fluorescent color wheel (30) and the light-reflecting member (40), such that the three have a relatively compact structure, and the space occupied by the projection light source system (100) can be significantly reduced.

Description

Projection light source system and projection equipment Technical Field

[0001] The present application relates to the field of light beam lighting technology, and in particular to a projection light source system and projection equipment. Background Art

[0002] As people's requirements for the degree of interaction between vehicles and the external environment continue to increase, existing vehicles integrate projection equipment into the vehicle's headlights to enable the vehicle to have the function of external projection. The vehicle can project patterns onto the exterior surface of a building or the ground through the vehicle's headlights.

[0003] However, the space for car headlights is limited, and the various components in traditional projection equipment, from the light source to the relay system, display chip, and projection lens, are generally arranged along the extension direction of the main optical axis to set the optical path. This makes these components arranged relatively discretely, and the entire projection equipment is large in size. Therefore, it is difficult to integrate the projection equipment and car headlights.

[0004] Utility Model Content

[0005] Embodiments of the present application provide a projection light source system and a projection device.

[0006] In the first aspect, the present application provides a projection light source system, which is applied to a projection device including a display chip, and the projection light source system includes a light source module, a light guiding system, a fluorescent color wheel and a reflector; the light source module is used to emit a laser beam; the light guiding system is arranged on the optical path of the laser beam and is used to adjust the emission direction of the laser beam; the fluorescent color wheel includes multiple fluorescent excitation areas of different colors, the light guiding system guides the laser beam to the fluorescent color wheel, the multiple fluorescent excitation areas receive the laser beam in turn, and each fluorescent excitation area reflects an illumination beam under the excitation of the laser beam; the reflector is arranged opposite to the fluorescent color wheel and is located on the optical path of the illumination beam, the light guiding system is located between the fluorescent color wheel and the reflector, so that part of the optical path of the illumination beam and the laser beam overlap, and the reflector is used to reflect the illumination beam to the display chip.

[0007] In some optional embodiments, the light source module includes a monochromatic laser emitter for emitting a laser beam of a specified color, and the light guiding system includes a filter, which is arranged in the optical path of the laser beam and is used to reflect the laser beam of the specified color to the color wheel.

[0008] In some optional embodiments, the designated color is blue; and the filter is a blue-reflecting and yellow-transmitting filter.

[0009] In some optional embodiments, a laser beam of a designated color excites a fluorescent color wheel to form an illumination beam, a filter is located in an optical path of the illumination beam and is used to transmit the illumination beam, and a reflector is located on a side of the filter away from the color wheel.

[0010] In some optional embodiments, the light guiding system further includes a focusing lens, which is located between the monochromatic laser emitter and the filter. The focusing lens is located in the optical path of the laser beam and is used to converge the laser beam onto the filter.

[0011] In some optional embodiments, the light guiding system further includes an illumination lens, which is disposed between the filter and the fluorescent color wheel and is used to transmit the laser beam and the illumination beam. The illumination beam passes through the illumination lens and the filter and is then transmitted to the reflector.

[0012] In some optional embodiments, the light-emitting element reflects the illumination light beam to the display chip, the display chip generates a projection light beam, and the projection light beam is transmitted toward the space between the reflective element and the light guide; the filter does not intersect the optical axis of the illumination lens, the filter is located at the edge of the light path of the illumination light beam between the illumination lens and the reflective element, and the filter is located outside the light path of the projection light beam.

[0013] In some optional embodiments, the light guiding system includes a light homogenizer, which is located between the fluorescent color wheel and the reflector. The light homogenizer has a first end face and a second end face arranged opposite to each other, the first end face faces the reflector, and the second end face faces the fluorescent color wheel; the laser beam is transmitted into the light homogenizer through the first end face, and after being homogenized by the light homogenizer, the laser beam is diverged to the fluorescent color wheel through the second end face to form an illumination beam. After the illumination beam is transmitted into the light homogenizer through the second end face, it is transmitted to the reflector through the first end face.

[0014] In some optional embodiments, the ratio between the area of ​​the first end face and the area of ​​the second end face is 6.25:1, or / and the first end face is a rectangle, and the ratio of the lengths of two adjacent sides of the first end face is 2:1; or / and the second end face is a rectangle, and the ratio of the lengths of two adjacent sides of the second end face is 2:1.

[0015] In some optional embodiments, the reflective element has a reflective concave surface, which is an aspherical surface. The illumination light beam is reflected by the reflective concave surface and then transmitted toward the display chip. The range of the incident angle of the illumination light beam on the surface of the display chip is: greater than or equal to 23° and less than or equal to 25°.

[0016] In a second aspect, the present application further provides a projection device, which includes a display chip and the above-mentioned projection light source system. The projection light source system is used to form an illumination beam, and the display chip is arranged on the optical path of the illumination beam.

[0017] In some optional embodiments, the display chip is arranged corresponding to the reflective element, the illumination beam is transmitted from the reflective element to the display chip, the display chip receives the illumination beam and generates a projection beam, the projection beam is emitted toward the space between the reflective element and the fluorescent color wheel, and intersects with the illumination beam.

[0018] In some optional embodiments, the projection device further includes a projection lens, and the display chip and the projection lens are arranged at intervals along the main optical axis of the projection lens; when the projection device is projected onto the plane where the main optical axis of the projection lens is located, the projection of the reflective element and the projection of the light guiding system are both located between the display chip and the projection lens.

[0019] An embodiment of the present application provides a projection light source system, which includes a light source module for emitting a laser beam, and a light guiding system, a fluorescent color wheel, and a reflective element located on the optical path of the laser beam. The light source module should be understood as a projection light source system, i.e., the light source of a projection device. The light guiding system can adjust the direction of the laser beam so that the laser beam is transmitted to the fluorescent color wheel. The fluorescent color wheel in this embodiment can rotate around its rotation axis, and the fluorescent color wheel includes a plurality of fluorescent excitation regions of different colors, and a plurality of different fluorescent laser regions are arranged around the rotation axis of the fluorescent color wheel. In this embodiment, the laser beam is transmitted to the fluorescent color wheel while maintaining a specific emission direction, and the plurality of fluorescent excitation regions can be rotated in sequence to positions corresponding to the laser beam so as to be able to receive the laser beam. Each fluorescent excitation region emits an illumination beam under the excitation of the laser beam, and the illumination beam is used to be transmitted to the display chip. The color of the illumination beam emitted by each fluorescent excitation region is different.

[0020] The reflector in this embodiment is positioned in the optical path of the illumination beam and is positioned in correspondence with the display chip, so that upon receiving the illumination beam, the reflector can reflect the illumination beam toward the display chip. The reflector in this embodiment is positioned opposite the fluorescent color wheel, effectively simplifying the optical path of the illumination beam and shortening its transmission distance. It also reduces the space occupied by the fluorescent color wheel and the reflector. Furthermore, the light guidance system in this embodiment is positioned between the fluorescent color wheel and the reflector, reducing the space occupied by the light guidance system, the fluorescent color wheel, and the reflector, further reducing the space occupied by the projection light source system. Under this configuration, the illumination beam and the laser beam partially overlap, meaning that the illumination beam between the fluorescent color wheel and the reflector overlaps with the laser beam between the light guidance system and the fluorescent color wheel.

[0021] Therefore, the projection light source system in this embodiment arranges the fluorescent color wheel and the reflector relatively spaced apart, and arranges the light guiding system between the fluorescent color wheel and the reflector, so that the structure of the three is relatively compact, which can significantly reduce the space occupied by the projection light source system and improve the integration of the projection light source system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] FIG1 is a schematic structural diagram of a projection device and a projection light source system provided in an embodiment of the present application.

[0024] FIG. 2 is a schematic structural diagram of the projection device shown in FIG. 1 from another perspective.

[0025] FIG3 is a schematic structural diagram of the projection device shown in FIG1 projecting along the rotation axis of the fluorescent color wheel.

[0026] FIG. 4 is a schematic structural diagram of an optical assembly in the projection device shown in FIG. 1 .

[0027] FIG5 is a schematic structural diagram of a light homogenizing element in the projection device shown in FIG1 .

[0028] FIG6 is a schematic structural diagram of a right-handed coordinate system and edges of a display chip in the projection device shown in FIG1 .

[0029] Figure numbers: 1000, projection equipment, 900, display chip, 800, projection lens, 100, projection light source system, 10, light source module, 11, monochromatic laser emitter, 20, light guiding system, 21, filter, 211, blue-reflecting and yellow-transmitting filter, 22, focusing lens, 23, illumination lens, 24, light homogenizer, 241, first end face, 242, second end face, 30, fluorescent color wheel, 31, fluorescent excitation area, 40, reflector, 41, reflective concave surface. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0031] Referring to FIG. 1 , an embodiment of the present application provides a projection device 1000 for projecting a color image onto a projection surface. Projection device 1000 can be used for indoor projection or integrated into a mobile device for outdoor projection. For example, in this embodiment, projection device 1000 is mounted on a vehicle's headlights, enabling the vehicle to project bright and clear color patterns, images, or symbols onto building facades or the ground.

[0032] The projection device 1000 in this embodiment may include a display chip 900 and a projection light source system 100. The projection light source system 100 is capable of emitting an illumination beam. In this embodiment, the spatial positions of the projection light source system 100 and the display chip 900 are arranged so that the illumination beam can be transmitted to the display chip 900. The display chip 900, under the illumination of the illumination beam, can generate a projection beam. This embodiment does not limit the color of the projection beam. The display chip 900 can directly generate a colored projection beam, which can directly form a colored pattern when projected onto a projection surface. The projection beam can also be a monochromatic projection beam. The display chip 900 can generate projection beams of multiple colors, each color of which forms a monochromatic grayscale image when projected onto the projection surface. Due to the persistence of vision of the human eye, multiple projection beams can be projected onto the projection surface in a certain time sequence and order. The grayscale images of different colors can be synthesized into a color image on the projection surface, thereby realizing the color projection display function of the projection device 1000. This embodiment does not limit the type of the display chip 900. For example, in this embodiment, the display chip 900 is a digital micromirror device (DMD) chip. The DMD chip has a small structure and a simple optical path, and is suitable for integration into a vehicle headlight with a small accommodation space.

[0033] Referring to Figures 1, 2, and 3, the projection light source system 100 in this embodiment may include a light source module 10 for emitting a laser beam, as well as a light guide system 20 and a fluorescent color wheel 30 located in the optical path of the laser beam. The light source module 10 should be understood as the light source of the projection light source system 100, i.e., the projection device 1000. The light guide system 20 is capable of receiving the laser beam and changing the emission direction of the laser beam to transmit the laser beam to other components for further processing. For example, in this embodiment, the light guide system 20 is capable of adjusting the direction of the laser beam so that the laser beam is transmitted to the fluorescent color wheel 30. The fluorescent color wheel 30 in this embodiment is capable of rotating about its rotation axis. The fluorescent color wheel 30 includes a plurality of fluorescent excitation regions 31 of different colors, and a plurality of different fluorescent laser regions are arranged around the rotation axis of the fluorescent color wheel 30. In this embodiment, the laser beam maintains a specific emission direction and is transmitted to the fluorescent color wheel 30. The multiple fluorescent excitation regions 31 can rotate in sequence to positions corresponding to the laser beam to receive the laser beam. Each fluorescent excitation region 31 emits an illumination beam under the excitation of the laser beam, and the illumination beam is then transmitted to the display chip 900. The illumination beam emitted by each fluorescent excitation region 31 has a different color.

[0034] Referring to Figures 1, 2, and 3, the projection light source system 100 in this embodiment further includes a reflector 40, which is used to transmit an illumination beam to the display chip 900. In this embodiment, the reflector 40 has an aspherical concave reflective surface 41. The reflector 40 reflects the illumination beam via the concave reflective surface 41, and the magnification ratio of the concave reflective surface 41 is 1:1. Specifically, the reflector 40, i.e., the concave reflective surface 41, is located in the optical path of the illumination beam and is positioned corresponding to the display chip 900 described above, so that after receiving the illumination beam, the reflector 40 can reflect the illumination beam toward the display chip 900. In this embodiment, the illumination light beam is reflected by the reflective concave surface 41 and transmitted to the display chip 900, wherein the range of the incident angle of the illumination light beam on the surface of the display chip 900 is: greater than or equal to 23° and less than or equal to 25°, so that the reflective element 40 can be located outside the optical path of the projection light beam generated by the display chip 900, thereby preventing the reflective element 40 from blocking the projection light beam, thereby resulting in lower quality of the projection image.

[0035] In this embodiment, the reflector 40 is positioned opposite the fluorescent color wheel 30, effectively simplifying the light path of the illumination beam and shortening its propagation distance. This also reduces the space occupied by the fluorescent color wheel 30 and the reflector 40. Furthermore, in this embodiment, the light guidance system 20 is positioned between the fluorescent color wheel 30 and the reflector 40, reducing the space occupied by the light guidance system 20, the fluorescent color wheel 30, and the reflector 40, further reducing the space occupied by the projection light source system 100. In this embodiment, the optical paths of the illumination beam and the laser beam partially overlap, meaning that the illumination beam between the fluorescent color wheel 30 and the reflector 40 overlaps with the laser beam between the light guidance system 20 and the fluorescent color wheel 30.

[0036] In the projection light source system 100 of this embodiment, the fluorescent color wheel 30 and the reflector 40 are relatively spaced apart, and the light guiding system 20 is arranged between the fluorescent color wheel 30 and the reflector 40, so that the structure of the three is relatively compact, which can significantly reduce the space occupied by the projection light source system 100 and improve the integration of the projection light source system 100.

[0037] As previously mentioned, in this embodiment, the display chip 900 and reflector 40 of the projection device 1000 are positioned in correspondence, enabling the display chip 900 to receive the illumination beam and, in response to the illumination beam, generate a projection beam. In this embodiment, the projection beam's emission direction is adjusted by adjusting the angle of the display chip 900, such that the projection beam is emitted toward the space between the reflector 40 and the fluorescent color wheel 30. Therefore, in this embodiment, the projection beam intersects the illumination beam. Specifically, the projection beam emitted from the display chip 900 intersects the illumination beam between the fluorescent color wheel 30 and the reflector 40. This arrangement allows components of the projection device 1000, other than the display chip 900 and the projection light source system 100, to be located near the projection light source and the display chip 900, preventing the multiple components and optical systems of the projection device 1000 from being too discrete. In this embodiment, the reflective element 40, the fluorescent color wheel 30, and the light guiding system 20 can be regarded as an optical combination D. According to the above content, it should be understood that the display chip 900 is located on one side of the optical combination D, and the projection light beam emitted by the display chip 900 is emitted toward the optical combination D and avoids the various components in the optical combination D.

[0038] Referring to Figures 1 and 2 , in this embodiment, the projection device 1000 further includes a projection lens 800. The projection lens 800 may include multiple lenses, with the optical axes of the multiple lenses all being aligned in a straight line, forming the principal optical axis of the projection lens 800. In this embodiment, the display chip 900 and the projection lens 800 are arranged substantially along the principal optical axis of the projection lens 800, so that the display chip 900 can be aligned with the projection lens 800 to a high degree. Consequently, the projection light beam emitted by the display chip 900 can be more directly transmitted to the projection lens 800. After undergoing steps such as convergence processing and color grading by the projection lens 800, the projection light beam is projected onto a projection surface. This improves the projection image quality.

[0039] Referring to FIG. 4 , as will be appreciated from the foregoing, in this embodiment, the projection lens 800 is disposed on a side of the optical assembly D facing away from the display chip 900 so as to receive the projection beam emitted by the display chip 900. Therefore, it should be understood that the optical assembly D is disposed between the display chip 900 and the projection lens 800. Specifically, in this embodiment, the reflector 40 and the light guiding system 20 are both located between the display chip 900 and the projection lens 800. The reflector 40 and the light guiding system 20 are spaced apart, and the space between the reflector 40 and the light guiding system 20 overlaps with the space between the display chip 900 and the projection lens 800. This overlapping space can be referred to as the imaging space E, within which the illumination beam and the projection beam are transmitted. It can be understood that the reflector 40, the display chip 900, the light guiding system 20, and the projection lens 800 are disposed around a central point and collectively define the imaging space E. Therefore, in the embodiment of the present application, the relatively compact arrangement of the various components of the projection device 1000 can effectively reduce the size of the projection device 1000, thereby allowing the projection device 1000 to be compatible with the structure of the vehicle headlight. In some embodiments, an additional position adjustment mechanism, such as a swing member, can be provided, connected between the vehicle and the projection device 1000 to adjust the angle of the projection lens 800, allowing the projection device 1000 to project onto a higher projection surface or onto the ground.

[0040] The light source module 10 in this embodiment includes a monochromatic laser emitter 11, which can be selected based on a specified color. For example, in this embodiment, the specified color is set to blue, so the laser light emitted by the monochromatic laser emitter 11 is blue. As previously mentioned, the fluorescent color wheel 30 is capable of receiving a laser beam and reflecting an illumination beam. To ensure the purity and light intensity of the reflected illumination beam, in this embodiment, the light guidance system 20 may further include a filter 21. The filter 21 is capable of reflecting a laser beam of the specified color and transmitting light of non-specified colors. For example, in this embodiment, the laser light emitted by the monochromatic laser emitter 11 is blue. Accordingly, the filter 21 is configured to select a blue-reflecting yellow filter 211. The blue-reflecting yellow filter 211 can filter out a pure blue laser beam and, by setting the spatial angle of the blue-reflecting yellow filter 211, direct the blue laser beam toward the fluorescent color wheel 30. In this embodiment, the reflectivity of the blue-reflecting and yellow-transmitting filter 211 to the blue laser beam is greater than 99.5%, and the transmittance to the yellow light is greater than 98%, so that the purity of the laser beam is at a relatively high level.

[0041] Referring to Figures 1, 2, and 3, the fluorescent color wheel 30 in this embodiment includes at least three fluorescent excitation areas 31, one of which is coated with a red phosphor layer. When excited by a blue laser beam, the red phosphor layer can generate a red illumination beam, and the divergence angle of the red illumination beam on the fluorescent color wheel 30 is 180°; one of the fluorescent excitation areas 31 is coated with a green phosphor layer. When excited by a blue laser beam, the green phosphor layer can generate a green illumination beam, and the divergence angle of the green illumination beam on the fluorescent color wheel 30 is 180°; and one of the fluorescent excitation areas 31 is coated with a blue phosphor layer. After receiving the blue laser beam, the blue phosphor layer reflectively scatters the blue laser beam to form a blue illumination beam, and the divergence angle of the blue illumination beam on the fluorescent color wheel 30 is 180°. In this embodiment, by providing an anti-blue and yellow-transmitting filter 211, each fluorescent excitation area 31 can receive a blue laser beam with a relatively high purity, and the generated illumination beam is also relatively pure, avoiding the interference of stray light on the fluorescent excitation area 31, making the light intensity of the illumination beam also stronger, thereby improving the illumination efficiency of the projection light source system 100.

[0042] Referring to Figures 1, 2, and 3, the light guidance system 20 in this embodiment further includes a focusing lens 22, which is positioned between the monochromatic laser emitter 11 and the optical filter 21. Positioned in the optical path of the laser beam, the focusing lens 22 reduces the outer diameter of the laser beam and substantially converges the laser beam onto the optical filter 21. Consequently, the laser beam forms a smaller spot on the optical filter 21, resulting in higher light utilization efficiency. Therefore, the dimensions of the optical filter 21 in this embodiment can be relatively small. For example, the length of the optical filter 21 in this embodiment is greater than or equal to 5 mm and less than or equal to 9 mm, the width is greater than or equal to 1.5 mm and less than or equal to 3 mm, and the thickness is greater than or equal to 0.5 mm and less than or equal to 1 mm. The focal length of the focusing lens 22 in this embodiment is relatively short, being greater than or equal to 6 mm and less than or equal to 7 mm. This reduces the distance between the optical filter 21 and the focusing lens 22, thereby reducing the space occupied by the light guidance system 20.

[0043] Referring to Figures 1, 2, and 3, the light guidance system 20 in this embodiment further includes an illumination lens 23, which is disposed between the filter 21 and the fluorescent wheel 30. Furthermore, the illumination lens 23 is also located between the fluorescent wheel 30 and the reflector 40. Specifically, the filter 21 changes the optical path of the laser beam, directing it toward the fluorescent wheel 30. The illumination lens 23, positioned in the laser beam's optical path, fine-tunes the laser beam's optical path, ensuring more accurate and consistent transmission of the laser beam to the fluorescent wheel 30. Furthermore, the illumination lens 23 in this embodiment also increases the outer diameter of the laser beam, reducing its power density and preventing thermal quenching of the fluorescent wheel 30 under the high-power-density laser beam. The fluorescent wheel 30 is excited to emit an illumination beam, which is then directed toward the reflector 40. The illumination lens 23, positioned in the laser beam's optical path, converges the illumination beam, reducing its divergence and ensuring that more of it is transmitted to the reflector 40. Therefore, in this embodiment, the illumination lens 23 is provided in the projection light source system 100 to reduce light beam loss during transmission, thereby improving the illumination efficiency and brightness of the projection light source system 100. In this embodiment, the distance between the filter 21 and the illumination lens 23 is greater than or equal to 1 mm and less than or equal to 3 mm, thereby further reducing the space occupied by the light guide system 20.

[0044] As previously mentioned, in this embodiment, the light guiding system 20 is disposed between the reflector 40 and the fluorescent color wheel 30, and the illumination lens 23 is disposed between the filter 21 and the fluorescent color wheel 30. Therefore, the filter 21 is located between the reflector 40 and the illumination lens 23. Specifically, the filter 21 has a first surface and a second surface disposed opposite each other, with the illumination lens 23 disposed opposite the first surface and the reflector 40 disposed correspondingly on the second surface. The fluorescent color wheel 30 sequentially generates illumination beams of various colors and transmits them toward the illumination lens 23. The illumination beams then pass through the illumination lens 23 and are then transmitted toward the reflector 40. In this embodiment, the filter 21 is located in the optical path of the illumination beam between the illumination lens 23 and the reflector 40, enabling a more compact assembly of the components of the projection light source system 100, thereby reducing the space occupied by the projection light source system 100.

[0045] In this embodiment, the filter 21 is positioned at the edge of the optical path of the illumination beam to reduce its impact on the transmission of the illumination beam. Projected along the optical path of the illumination beam, the projected area of ​​the filter 21 is significantly smaller than the projected area of ​​the illumination beam. Specifically, the filter 21 in this embodiment is offset from the optical axis of the illumination lens 23. For example, in this embodiment, the filter 21 is designed to minimize the collinearity between any structure of the filter 21 and the optical axis of the illumination lens 23. This allows the filter 21 to avoid the optical path of the illumination beam as much as possible. This ensures a more uniform illumination beam received by the display chip 900, ensuring the quality of the resulting projection image and avoiding low color uniformity or yellowing or darkening at the edges of the projection image. Furthermore, in this embodiment, when the display chip 900 receives the illumination beam and generates a projection beam that is transmitted to the space between the reflector 40 and the light guiding system 20, the filter 21 is positioned outside the optical path of the projection beam to avoid direct impact on the projection image.

[0046] Referring to FIG. 2 , in this embodiment, the optical axis of the illumination lens 23 is arranged approximately parallel to the rotational axis of the fluorescent color wheel 30, spaced apart from the lens. Specifically, the optical axis of the illumination lens 23 and the normal to the fluorescent color wheel 30 are arranged approximately perpendicular to each other. This arrangement allows the laser beam to be transmitted to the fluorescent color wheel 30 in a direction approximately perpendicular to the surface of the fluorescent color wheel 30. The transmission direction of the illumination beam is generally aligned with the optical axis of the illumination lens 23, reducing scattering of the illumination beam and ensuring that as much of the illumination beam as possible is transmitted to the illumination lens 23. This, in turn, allows the reflector 40 to receive a larger amount of the illumination beam, thereby improving the projection effect of the lighting device.

[0047] Referring to Figures 1, 2, and 5, the light guidance system 20 in this embodiment may further include a light homogenizer 24. The light homogenizer 24 is located in the optical path of the laser beam so that the laser beam is homogenized by the light homogenizer 24 before being directed to the fluorescent color wheel 30. Specifically, the light homogenizer 24 in this embodiment is located between the illumination lens 23 and the fluorescent color wheel 30, that is, between the fluorescent color wheel 30 and the reflector 40. The light homogenizer 24 in this embodiment has a first end face 241 and a second end face 242 disposed in opposite directions. The first end face 241 faces the reflector 40, i.e., the illumination lens 23, and the second end face 242 faces the fluorescent color wheel 30. After the laser beam is converged by the illumination lens 23, it is directed into the light homogenizer 24 via the first end face 241. After being homogenized by the light homogenizer 24, the laser beam is diverged via the second end face 242 to the fluorescent color wheel 30. The corresponding fluorescent excitation area 31 then reflects an illumination beam, which is then transmitted into the light homogenizer 24 via the second end face 242 and then transmitted to the illumination lens 23 via the first end face 241. After being converged by the illumination lens 23, the illumination beam is transmitted to the reflective element 40. In this embodiment, the light homogenizer 24 is provided so that a laser beam with a Gaussian intensity distribution can be transmitted to the fluorescent reflection area on the fluorescent color wheel 30 after light homogenization. On the one hand, the laser beam becomes more uniform after light homogenization, so that the illumination beam reflected by the fluorescent color wheel 30 also has a relatively uniform advantage, which can ensure the display effect of the final projection image. On the other hand, the intensity of the high-intensity laser beam is weakened to a certain extent after light homogenization, which can prevent the phosphor flakes on the fluorescent excitation area 31 from being thermally quenched by the high-power density laser beam, thereby preventing damage to the fluorescent color wheel 30 and extending the service life of the fluorescent color wheel 30 and the projection device 1000.

[0048] Please refer to Figures 1 and 2. In this embodiment, the distance between the fluorescent color wheel 30 and the second end surface 242 of the light homogenizer 24 is greater than or equal to 0.2 mm and less than or equal to 0.5 mm. This distance can prevent the light homogenizer 24 from being too close to the fluorescent color wheel 30, thereby preventing the fluorescent color wheel 30 from colliding with the light homogenizer 24 during rotation. At the same time, it can prevent the light homogenizer 24 from being too far from the fluorescent color wheel 30, thereby reducing the efficiency of the light homogenizer 24 in collecting fluorescence. As a result, the light homogenizer 24 can efficiently collect the light of the illumination beam excited by the fluorescent color wheel 30, reduce light loss, and improve the lighting efficiency and brightness of the projection light source system 100.

[0049] Referring to Figures 2 and 5 , in this embodiment, the ratio between the first end surface 241 and the second end surface 242 of the light diffuser 24 is 6.25:1, meaning the area of ​​the first end surface 241 is larger than the area of ​​the second end surface 242. In this embodiment, the first end surface 241 corresponds to the illumination lens 23. The larger and wider area of ​​the first end surface 241 allows the light diffuser 24 to receive a larger amount of the laser beam, i.e., the light source. The second end surface 242 corresponds to the fluorescent wheel 30. The smaller and narrower area of ​​the second end surface 242 allows the laser beam emitted from the second end surface 242 to be thinner, thus preventing excessive divergence. In conjunction with the foregoing, the laser beam in this embodiment is transmitted approximately perpendicular to the fluorescent wheel 30, and the distance between the fluorescent wheel 30 and the second end surface 242 of the light diffuser 24 is relatively small, allowing the second end surface 242 to effectively receive the illumination beam reflected by the fluorescent wheel 30.

[0050] In this embodiment, the light diffuser 24 has a truncated pyramid structure, wherein the first end surface 241 is rectangular, and the length ratio of the two adjacent sides of the first end surface 241 is 2:1. The second end surface 242 is also rectangular, and the length ratio of the two adjacent sides of the second end surface 242 is 2:1. The long side of the first end surface 241 is parallel to the long side of the second end surface 242, with a ratio of 2.5:1. The short side of the first end surface 241 is parallel to the short side of the second end surface 242, with a ratio of 2.5:1. In other embodiments, the light diffuser 24 may have a truncated pyramid structure.

[0051] Please refer to Figures 1 and 2, and combine the above description to illustrate the transmission path of the laser beam in the entire projection device 1000. Specifically, the monochromatic laser emitter 11 emits a laser beam of a specified monochromatic color. The laser beam is converged by the focusing lens 22 and transmitted to the filter 21. The filter 21 reflects the laser beam of the specified color (the specified color in this embodiment is blue) to the illumination lens 23. The laser beam of the specified color is fine-tuned by the illumination lens 23 and transmitted to the light homogenizer 24. After the light homogenization processing by the light homogenizer 24, it is transmitted to one of the fluorescent color wheels 30. A fluorescent excitation area 31 has a fluorescent powder layer of a certain color on the fluorescent excitation area 31. After being excited, the fluorescent powder layer of the color reflects an illumination light beam of the color. The illumination light beam passes through the light homogenizer 24, the illumination lens 23 and the filter 21 in sequence and is transmitted to the reflector 40. After being reflected by the reflector 40, it is transmitted to the display chip 900. The display chip 900 processes the illumination light beam and generates a projection light beam. The projection light beam is transmitted to the projection lens 800 and undergoes color adjustment processing or convergence processing by the projection lens 800, and is finally projected onto the projection surface.

[0052] Referring to Figure 6 , multiple components in this embodiment require angle adjustment and installation to ensure that the laser beam, illumination beam, and projection beam are transmitted along the optical paths described above. This embodiment will illustrate the angle adjustment that occurs when a component switches from an initial state to a target state. Specifically, the display chip 900 in this embodiment has a roughly cubic structure. First, a right-handed coordinate system is defined based on the three intersecting edges of the display chip 900. The length side A of the display chip 900 extends along the α-axis, the width side B of the display chip 900 extends along the β-axis, and the thickness side C of the display chip 900 extends along the γ-axis. The multiple components are then placed into this right-handed coordinate system.

[0053] Referring to Figure 1 , in this embodiment, a monochromatic laser emitter 11 emits a laser beam. In its initial state, the laser beam extends along the positive direction of the γ-axis. Subsequently, the monochromatic laser emitter 11 rotates 38° counterclockwise around the α-axis (counterclockwise in right-hand coordinates, the same applies hereinafter) to switch to the target state. In this embodiment, the optical axis of the focusing lens 22 is parallel to the γ-axis in its initial state. In its target state, the optical axis of the focusing lens 22 is collinear with the optical path of the laser beam. The optical filter 21 in this embodiment is a cube. In its initial state, the normal to the surface of the filter 21 is parallel to the γ-axis, and the longest edge of the filter 21 is parallel to the α-axis. Subsequently, the filter 21 is rotated counterclockwise around the α-axis by an angle greater than or equal to 77° and less than or equal to 78°, and around the β-axis by an angle greater than or equal to 0° and less than or equal to 2°, to switch to the target state. In this embodiment, in the initial state of the illumination lens 23, the optical axis of the illumination lens 23 is parallel to the γ-axis. The illumination lens 23 then rotates 116° counterclockwise about the α-axis to switch to the target state. In this embodiment, in the initial state of the truncated pyramid-shaped light diffuser 24, the normal of the first end surface 241 is parallel to the γ-axis, and the longitudinal side of the first end surface 241 is parallel to the α-axis. The light diffuser 24 then rotates 116° counterclockwise about the α-axis to switch to the target state. In this embodiment, in the initial state of the fluorescent color wheel 30, the rotation axis of the fluorescent color wheel 30 is parallel to the γ-axis. When the fluorescent color wheel 30 is in the target state, the rotation axis of the fluorescent color wheel 30 is arranged parallel to the optical axis of the illumination lens 23. In this embodiment, in the initial state of the reflector 40, the reflective concave surface 41 of the reflector 40 opens in the positive direction of the γ-axis, and the optical axis of the reflective concave surface 41 is parallel to the γ-axis. The reflector 40 then rotates 125° counterclockwise about the α-axis to switch to the target state. The coordinate system in this embodiment is established based on display chip 900, and the angle of display chip 900 does not change within this coordinate system. In this embodiment, when projection lens 800 is in its initial state, its principal optical axis is parallel to the γ-axis, and its angle does not change. This discussion only discusses the angle changes between various components; please refer to the previous section for the positional relationships between these components.

[0054] In summary, the projection light source system 100 provided in this embodiment includes a light source module 10 for emitting a laser beam, as well as a light guidance system 20, a fluorescent color wheel 30, and a reflector 40 located in the optical path of the laser beam. The light source module 10 should be understood as the light source of the projection light source system 100, i.e., the projection device 1000. The light guidance system 20 is capable of adjusting the direction of the laser beam so that the laser beam is transmitted to the fluorescent color wheel 30. The fluorescent color wheel 30 in this embodiment is capable of rotating about its rotation axis and includes multiple fluorescent excitation regions 31 of different colors. The multiple different fluorescent laser regions are arranged around the rotation axis of the fluorescent color wheel 30. In this embodiment, the laser beam is transmitted to the fluorescent color wheel 30 while maintaining a specific emission direction. The multiple fluorescent excitation regions 31 are capable of rotating sequentially to positions corresponding to the laser beam to receive the laser beam. Under the excitation of the laser beam, each fluorescent excitation region 31 emits an illumination beam, which is then transmitted to the display chip 900. The illumination beam emitted by each fluorescent excitation region 31 has a different color.

[0055] In this embodiment, the reflector 40 is positioned in the optical path of the illumination beam and is positioned in correspondence with the display chip 900, so that after receiving the illumination beam, the reflector 40 can reflect the illumination beam toward the display chip 900. The reflector 40 and the fluorescent color wheel 30 in this embodiment are positioned opposite each other, effectively simplifying the optical path of the illumination beam and shortening the transmission distance of the illumination beam. This also reduces the space occupied by the fluorescent color wheel 30 and the reflector 40. Furthermore, in this embodiment, the light guidance system 20 is positioned between the fluorescent color wheel 30 and the reflector 40, reducing the space occupied by the light guidance system 20, the fluorescent color wheel 30, and the reflector 40, further reducing the space occupied by the projection light source system 100. In this embodiment, the optical paths of the illumination beam and the laser beam partially overlap, meaning that the illumination beam between the fluorescent color wheel 30 and the reflector 40 overlaps with the laser beam between the light guidance system 20 and the fluorescent color wheel 30.

[0056] Therefore, the projection light source system 100 in this embodiment arranges the fluorescent color wheel 30 and the reflector 40 relatively spaced apart, and arranges the light guiding system 20 between the fluorescent color wheel 30 and the reflector 40, so that the structure of the three is relatively compact, which can significantly reduce the space occupied by the projection light source system 100 and improve the integration of the projection light source system 100.

[0057] In the specification of this application, certain words are used to refer to specific components in the specification and claims. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of the components as the criterion for distinction. For example, "including" mentioned throughout the specification and claims is an open term and should be interpreted as "including but not limited to"; "substantially" means that those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.

[0058] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "inside", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only used to simplify the description for the convenience of describing this application, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on this application.

[0059] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, these terms may refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; internal communication between two components; or mere surface contact. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements 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 the present application.

Claims

1. A projection light source system, characterized in that, The projection light source system is applied to a projection device including a display chip, and the projection light source system includes: A light source module, used for emitting a laser beam; A light guiding system, arranged on the optical path of the laser beam and used for adjusting the emission direction of the laser beam; A fluorescent color wheel, wherein the fluorescent color wheel comprises a plurality of fluorescent excitation areas of different colors, the light guiding system guides the laser beam to the fluorescent color wheel, the plurality of fluorescent excitation areas sequentially receive the laser beam, and each of the fluorescent excitation areas reflects an illumination beam under the excitation of the laser beam; and A reflector, wherein the reflector is arranged opposite to the fluorescent color wheel and is located on the optical path of the illumination light beam, the light guiding system is located between the fluorescent color wheel and the reflector, so that part of the optical path of the illumination light beam and the laser light beam overlaps, and the reflector is used to reflect the illumination light beam to the display chip.

2. The projection light source system according to claim 1, wherein The light source module includes a monochromatic laser emitter for emitting the laser beam of a specified color, and the light guiding system includes a filter, which is arranged on the optical path of the laser beam and is used to reflect the laser beam of the specified color to the color wheel.

3. The projection light source system according to claim 2, wherein The designated color is blue; the filter is a blue-reflecting and yellow-transmitting filter.

4. The projection light source system according to claim 2, characterized in that, The laser beam of the designated color excites the fluorescent color wheel to form the illumination beam. The filter is located on the optical path of the illumination beam and is used to transmit the illumination beam. The reflector is located on the side of the filter away from the color wheel.

5. The projection light source system according to claim 2, wherein The light guiding system further comprises a focusing lens, which is located between the monochromatic laser emitter and the filter. The focusing lens is located on the optical path of the laser beam and is used to converge the laser beam onto the filter.

6. The projection light source system according to any one of claims 2 to 5, characterized in that, The light guiding system further comprises an illumination lens, which is arranged between the filter and the fluorescent color wheel and is used to transmit the laser beam and the illumination beam. The illumination beam passes through the illumination lens and the filter and is then transmitted to the reflector.

7. The projection light source system according to claim 6, wherein The light emitting element reflects the illumination light beam to the display chip, the display chip generates a projection light beam, and the projection light beam is conducted toward the space between the reflective element and the light guide; The filter does not intersect the optical axis of the illumination lens, the filter is located at the edge of the optical path of the illumination light beam between the illumination lens and the reflector, and the filter is located outside the optical path of the projection light beam.

8. The projection light source system according to any one of claims 1 to 5, characterized in that, The light guiding system comprises a light homogenizer, the light homogenizer is located between the fluorescent color wheel and the reflector, the light homogenizer has a first end face and a second end face which are arranged opposite to each other, the first end face faces the reflector, and the second end face faces the fluorescent color wheel; The laser beam is transmitted into the light homogenizer via the first end face, the laser beam is homogenized by the light homogenizer and then diverges to the fluorescent color wheel via the second end face to form the illumination beam, and the illumination beam is transmitted into the light homogenizer via the second end face and then transmitted to the reflector via the first end face.

9. The projection light source system according to claim 8, wherein, The ratio between the area of the first end face and the area of the second end face is 6.25:1, or / and The first end face is rectangular, and the ratio of the lengths of two adjacent sides of the first end face is 2:1; or / and The second end face is rectangular, and the ratio of the lengths of two adjacent sides of the second end face is 2:

1.

10. The projection light source system according to any one of claims 1 to 5, characterized in that, The reflecting member has a reflecting concave surface, the reflecting concave surface is an aspherical surface, the illumination light beam is reflected by the reflecting concave surface and then conducted towards the display chip, and the range of the incident angle of the illumination light beam on the surface of the display chip is: greater than or equal to 23° and less than or equal to 25°.

11. A projection device, characterized in that, Comprising: A display chip; And A projection light source system according to any one of claims 1 to 10, the projection light source system being used to form the illumination light beam, and the display chip being arranged on the optical path of the illumination light beam.

12. The projection device according to claim 11, wherein, The display chip is correspondingly arranged with the reflecting member, the illumination light beam is conducted from the reflecting member to the display chip, the display chip receives the illumination light beam and generates a projection light beam, and the projection light beam is emitted towards the space between the reflecting member and the fluorescent color wheel and intersects with the illumination light beam.

13. The projection device according to claim 11 or 12, characterized in that, The projection device further includes a projection lens, and the display chip and the projection lens are arranged at intervals along the main optical axis of the projection lens; When the projection device is projected onto the plane where the main optical axis of the projection lens is located, the projections of the reflecting member and the light guiding system are both located between the display chip and the projection lens.

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