Projection light source system and projection equipment

Abstract

The utility model relates to a projection light source system and projection equipment, the projection light source system is applied to the projection equipment comprising a display chip, the projection light source system comprises a light source module, a light guiding system, a fluorescent color wheel and a light reflecting part, and the light source module emits a laser beam; the light guiding system is arranged on a light path of the laser beam and transmits the laser beam to the fluorescent color wheel; the fluorescent color wheel comprises a plurality of fluorescent excitation areas with different colors, and the plurality of fluorescent excitation areas receive the laser beams in sequence and reflect illumination beams; the light reflecting part and the fluorescent color wheel are oppositely arranged, the light guiding system is located between the fluorescent color wheel and the light reflecting part so that the illumination beam and the laser beam can coincide, and the light reflecting part reflects the illumination beam to the display chip. According to the projection light source system, the fluorescent color wheel and the reflecting part are oppositely arranged at intervals, and the light guide system is arranged between the fluorescent color wheel and the reflecting part, so that the structures of the fluorescent color wheel, the reflecting part and the light guide system are relatively compact, and the space occupied by the projection light source system can be obviously reduced.

Description

Technical Field

[0001] The present application relates to the technical field of light beam illumination, and in particular to a projection light source system and a projection device. 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 so that the vehicle has 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 light sources to relay systems, display chips, and projection lenses, are generally arranged along the extension direction of the main optical axis to set the optical path, making these components arranged more discretely and the entire projection equipment larger in size. Therefore, it is more difficult to integrate the projection equipment and car headlights. Utility Model Content

[0004] Embodiments of the present application provide a projection light source system and a projection device.

[0005] In a 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 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 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.

[0006] 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 on the optical path of the laser beam and is used to reflect the laser beam of the specified color to the color wheel.

[0007] In some optional embodiments, the designated color is blue; and the filter is a blue-reflecting and yellow-transmitting filter.

[0008] 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 the 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.

[0009] In some optional embodiments, the light guiding system further comprises a focusing lens, which is located between the monochromatic laser emitter and the filter, and is located on the optical path of the laser beam and is used to converge the laser beam onto the filter.

[0010] 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 reflective element.

[0011] In some optional embodiments, the reflector 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 reflector 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.

[0012] In some optional embodiments, the light guiding system includes a light homogenizer, which is located between the fluorescent color wheel and the reflector, and 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 light beam is transmitted into the light homogenizer through the first end face, and after being homogenized by the light homogenizer, the laser light beam is diverged to the fluorescent color wheel through the second end face to form an illumination beam, and 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.

[0013] 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.

[0014] 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°.

[0015] 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 light beam, and the display chip is arranged on the light path of the illumination light beam.

[0016] 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.

[0017] In some optional embodiments, the projection device also includes a projection lens, and the display chip and the projection lens are arranged and spaced apart 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.

[0018] The 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 reflector located on the optical path of the laser beam. The light source module should be understood as a projection light source system, i.e., a 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 areas of different colors, and a plurality of different fluorescent laser areas 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 a plurality of fluorescent excitation areas can be rotated in turn to a position corresponding to the laser beam so as to receive the laser beam, and each fluorescent excitation area emits an illumination beam under the excitation of the laser beam, and the illumination beam is used to be transmitted to the display chip. Among them, the color of the illumination beam emitted by each fluorescent excitation area is different.

[0019] The reflector in this embodiment is located on the optical path of the illumination beam and is arranged corresponding to the display chip so that the reflector can reflect the illumination beam onto the display chip after receiving the illumination beam. The reflector in this embodiment is arranged opposite to the fluorescent color wheel, which can effectively simplify the light path of the illumination beam and shorten the transmission distance of the illumination beam, and can also reduce the space jointly occupied by the fluorescent color wheel and the reflector. Furthermore, the light guide system in this embodiment is arranged between the fluorescent color wheel and the reflector, so that the space jointly occupied by the light guide system, the fluorescent color wheel and the reflector is smaller, which can further reduce the space occupied by the projection light source system. Under the arrangement of this embodiment, part of the optical path of the illumination beam and the laser beam overlaps, that is, there is an overlapping part between the illumination beam between the fluorescent color wheel and the reflector and the laser beam between the light guide system and the fluorescent color wheel.

[0020] Therefore, the projection light source system in this embodiment arranges the fluorescent color wheel and the reflector relatively at intervals, 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

[0021] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the implementation manner will be briefly introduced below. Obviously, the drawings described below are only some implementation manners of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 It is a structural schematic diagram of the projection device and the projection light source system provided in the embodiment of the present application.

[0023] Figure 2 yes Figure 1 A schematic structural diagram of the projection device from another perspective is shown.

[0024] Figure 3 yes Figure 1 The structure diagram of the projection device shown is projected along the rotation axis of the fluorescent color wheel.

[0025] Figure 4 yes Figure 1 Schematic diagram of the structure of the optical combination in the projection device shown.

[0026] Figure 5 yes Figure 1 A schematic diagram of the structure of a light homogenizing component in the projection device shown.

[0027] Figure 6 yes Figure 1 A schematic structural diagram of the right-hand coordinate system in the projection device and the edges of the display chip.

[0028] 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, anti-blue and yellow 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

[0029] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0030] See also Figure 1The embodiment of the present application provides a projection device 1000 for projecting a color image onto a projection surface. The projection device 1000 can be applied to indoor projection, or the projection device 1000 can be integrated into a movable device for outdoor projection. For example, in the present embodiment, the projection device 1000 is arranged on the vehicle headlight, so that the vehicle has the function of projecting onto the facade of a building or the ground and forming a bright and clear color pattern / image / symbol.

[0031] The projection device 1000 in this embodiment may include a display chip 900 and a projection light source system 100, and the projection light source system 100 can emit an illumination beam. In this embodiment, the spatial positions of the projection light source system 100 and the display chip 900 are set so that the illumination beam can be transmitted to the display chip 900, and the display chip 900 can generate a projection beam under the irradiation of the illumination beam. In this embodiment, the color of the projection beam is not limited. The display chip 900 can directly generate a colored projection beam, and the projection beam can directly form a colored pattern when projected on the projection surface; the projection beam can also be a monochrome projection beam, and the display chip 900 can generate projection beams of multiple colors, and each color of the projection beam forms a monochrome grayscale image when projected onto the projection surface. Since the human eye has a visual persistence phenomenon, multiple projection beams can be projected onto the projection surface in a certain time sequence and order, and grayscale images of different colors are 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.

[0032] See also Figure 1 , Figure 2 and Figure 3The projection light source system 100 in this embodiment may include a light source module 10 for emitting a laser beam, and a light guide system 20 and a fluorescent color wheel 30 located on 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 can receive the laser beam and change 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 can adjust 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 can rotate around its rotation axis, and the fluorescent color wheel 30 includes a plurality of fluorescent excitation areas 31 of different colors, and a plurality of different fluorescent laser areas 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, and the plurality of fluorescent excitation areas 31 can be rotated in sequence to a position corresponding to the laser beam so as to receive the laser beam, and each fluorescent excitation area 31 emits an illumination beam under the excitation of the laser beam, and the illumination beam is used to be transmitted to the display chip 900. The color of the illumination light beam emitted by each fluorescence excitation region 31 is different.

[0033] See also Figure 1 , Figure 2 and Figure 3 , the projection light source system 100 in this embodiment further includes a reflector 40, which is used to transmit the illumination beam to the display chip 900. The reflector 40 in this embodiment has a non-spherical reflective concave surface 41, and the reflector 40 reflects the illumination beam through the reflective concave surface 41, and the magnification of the reflective concave surface 41 is 1:1. Specifically, the reflector 40, that is, the reflective concave surface 41, is located on the optical path of the illumination beam, and is arranged corresponding to the display chip 900 mentioned above, so that the reflector 40 can reflect the illumination beam to the display chip 900 after receiving the illumination beam. The illumination beam in this embodiment is transmitted to the display chip 900 under the reflection of the reflective concave surface 41, wherein the range of the incident angle of the illumination 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 reflector 40 can be located outside the optical path of the projection beam generated by the display chip 900, so as to avoid the reflector 40 blocking the projection beam, thereby resulting in a low quality of the projection picture.

[0034] The reflector 40 in this embodiment is arranged opposite to the fluorescent color wheel 30, which can effectively simplify the light path of the illumination beam, shorten the transmission distance of the illumination beam, and reduce the space jointly occupied by the fluorescent color wheel 30 and the reflector 40. Further, the light guide system 20 in this embodiment is arranged between the fluorescent color wheel 30 and the reflector 40, so that the space jointly occupied by the light guide system 20, the fluorescent color wheel 30 and the reflector 40 is small, which can further reduce the space occupied by the projection light source system 100. Under the arrangement of this embodiment, part of the light path of the illumination beam and the laser beam overlaps, that is, there is an overlap between the illumination beam between the fluorescent color wheel 30 and the reflector 40 and the laser beam between the light guide system 20 and the fluorescent color wheel 30.

[0035] 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.

[0036] As can be seen from the foregoing, in this embodiment, the display chip 900 and the reflector 40 of the projection device 1000 are arranged correspondingly so that the display chip 900 can receive the illumination beam, and the display chip 900 can generate a projection beam under the action of the illumination beam. In this embodiment, the projection beam is emitted toward the space between the reflector 40 and the fluorescent color wheel 30 by adjusting the angle of the display chip 900. Therefore, under such an arrangement in this embodiment, the projection beam intersects with the illumination beam, that is, the projection beam emitted from the display chip 900 is arranged to intersect with the illumination beam between the fluorescent color wheel 30 and the reflector 40. Such an arrangement in this embodiment allows the components of the projection device 1000 other than the display chip 900 and the projection light source system 100 to be arranged near the projection light source and the display chip 900, so as to avoid the multiple components and each optical system of the projection device 1000 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.

[0037] See also Figure 1 and Figure 2In this embodiment, the projection device 1000 further includes a projection lens 800, which may include a plurality of lenses, and the optical axes of the plurality of lenses are all in the same straight line to form the main optical axis of the projection lens 800. In this embodiment, the display chip 900 and the projection lens 800 are arranged substantially along the main optical axis of the projection lens 800, so that the display chip 900 can correspond to the projection lens 800 to a high degree, and thus the projection light beam emitted by the display chip 900 can be more directly transmitted to the projection lens 800, and the projection light beam is projected onto the projection surface after the steps of convergence processing and color adjustment processing of the projection lens 800, and the projection lens 800 can improve the projection imaging quality.

[0038] See also Figure 4 As can be seen from the foregoing content, in this embodiment, the projection lens 800 is arranged on the side of the optical assembly D away from the display chip 900 so as to receive the projection light beam emitted by the display chip 900. Therefore, it should be understood that the optical assembly D is arranged between the display chip 900 and the projection lens 800. Specifically, in this embodiment, the reflector 40 and the light guide system 20 are both located between the display chip 900 and the projection lens 800, and the reflector 40 and the light guide system 20 are arranged at intervals. There is an overlap between the space between the reflector 40 and the light guide system 20 and the space between the display chip 900 and the projection lens 800. The overlapped space can be called the imaging space E, and the illumination light beam and the projection light beam are conducted in the imaging space E. It can be understood that the reflector 40, the display chip 900, the light guide system 20 and the projection lens 800 are arranged around the center point and define the imaging space E together. Therefore, in the embodiment of the present application, the various components of the projection device 1000 are arranged in a relatively compact manner, which can effectively reduce the volume of the projection device 1000, so that the projection device 1000 is compatible with the structure of the vehicle headlight. In some embodiments, an additional position adjustment mechanism, such as a swinging member, etc., can be provided to connect the position adjustment structure between the vehicle and the projection device 1000 to adjust the angle of the projection lens 800, so that the projection device 1000 can project not only onto a higher projection surface, but also onto the ground.

[0039] The light source module 10 in this embodiment includes a monochromatic laser emitter 11, which can select the monochromatic laser emitter 11 according to the specified color. For example, in this embodiment, the specified color is set to blue, so the color of the laser emitted by the monochromatic laser emitter 11 is blue. As can be seen from the foregoing, the fluorescent color wheel 30 can receive the laser beam and reflect the illumination beam. In order to ensure the purity and light intensity of the reflected illumination beam, in this embodiment, the light guide system 20 can also include a filter 21, which can reflect the laser beam of the specified color and transmit the light of non-specified color. For example, in this embodiment, the color of the laser emitted by the monochromatic laser emitter 11 is blue, and the filter 21 correspondingly selects the anti-blue-transmitting yellow filter 211. The anti-blue-transmitting yellow filter 211 can filter out a pure blue laser beam, and by setting the spatial angle of the anti-blue-transmitting yellow filter 211, the blue laser beam is transmitted toward the fluorescent color wheel 30. In this embodiment, the reflectivity of the anti-blue 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.

[0040] See also Figure 1 , Figure 2 and Figure 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 fluorescent powder layer. The red fluorescent powder layer can generate a red illumination beam under the excitation of a blue laser 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 fluorescent powder layer. The green fluorescent powder layer can generate a green illumination beam under the excitation of a blue laser beam, and the divergence angle of the green illumination beam on the fluorescent color wheel 30 is 180°; one of the fluorescent excitation areas 31 is coated with a blue fluorescent powder layer. After receiving the blue laser beam, the blue fluorescent powder layer reflectively scatters the blue laser beam and forms a blue illumination beam. The divergence angle of the blue illumination beam on the fluorescent color wheel 30 is 180°. In this embodiment, by setting the anti-blue and yellow-transmitting filter 211, each fluorescent excitation area 31 can receive a blue laser light beam with a relatively high purity, and the generated illumination light beam is also relatively pure, avoiding the interference of stray light on the fluorescent excitation area 31, making the light intensity of the illumination light beam also stronger, thereby improving the illumination efficiency of the projection light source system 100.

[0041] See also Figure 1 , Figure 2 and Figure 3, the light guiding system 20 in this embodiment also includes a focusing lens 22, which is located between the monochromatic laser emitter 11 and the filter 21. The focusing lens 22 is located on the optical path of the laser beam, and the focusing lens 22 can reduce the outer diameter of the laser beam and basically converge the laser beam on the filter 21, so that the light spot formed by the laser beam on the filter 21 is also small and the light utilization rate is high. Therefore, the size of the filter 21 in this embodiment can be set to be smaller, for example, the length of the filter 21 in this embodiment is greater than or equal to 5mm and less than or equal to 9mm, the width is greater than or equal to 1.5mm and less than or equal to 3mm, and the thickness is greater than or equal to 0.5mm and less than or equal to 1mm. The focal length of the focusing lens 22 in this embodiment is small, the focal length is greater than or equal to 6mm and less than or equal to 7mm, which can make the distance between the filter 21 and the focusing lens 22 smaller, and reduce the space occupied by the light guiding system 20.

[0042] See also Figure 1 , Figure 2 and Figure 3 In this embodiment, the light guiding system 20 further includes an illumination lens 23, which is disposed between the filter 21 and the fluorescent color wheel 30, and further, the illumination lens 23 is also located between the fluorescent color wheel 30 and the reflector 40. Specifically, the filter 21 changes the optical path of the laser beam so that the laser beam is transmitted toward the fluorescent color wheel 30. The illumination lens 23 is disposed on the optical path of the laser beam, and can play a role in fine-tuning the optical path direction of the laser beam, so that the laser beam can be transmitted to the fluorescent color wheel 30 more accurately and more. On the other hand, the illumination lens 23 in this embodiment can also increase the outer diameter of the laser beam, reduce the power density of the laser beam, and avoid the thermal quenching phenomenon of the fluorescent color wheel 30 under the irradiation of the laser beam with a high power density. The fluorescent color wheel 30 is excited to emit an illumination beam and transmit it toward the reflector 40. The illumination lens 23 is disposed on the optical path of the illumination beam, and can play a role in converging the illumination beam, reducing the divergence of the illumination beam, so that the illumination beam is transmitted to the reflector 40 more. Therefore, in this embodiment, the illumination lens 23 is provided in the projection light source system 100, which can reduce the loss of the light beam during the transmission process, 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, so as to further reduce the space occupied by the light guide system 20.

[0043] As can be seen from the foregoing, the light guiding system 20 in this embodiment is arranged between the reflector 40 and the fluorescent color wheel 30, and the illumination lens 23 is arranged between the filter 21 and the fluorescent color wheel 30, so 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 that are arranged opposite to each other, wherein the illumination lens 23 is arranged opposite to the first surface, and the reflector 40 is correspondingly arranged on the second surface. The illumination light beams of multiple colors generated by the fluorescent color wheel 30 are sequentially transmitted toward the illumination lens 23, and the illumination light beams pass through the illumination lens 23 and are transmitted to the reflector 40. In this embodiment, the filter 21 is located on the optical path of the illumination light beam between the illumination lens 23 and the reflector 40, which can make the components of the projection light source system 100 arranged more compactly to reduce the occupied space of the projection light source system 100.

[0044] In this embodiment, the filter 21 is arranged at the edge position of the optical path of the illumination light beam to reduce the influence of the filter 21 on the transmission of the illumination light beam. When projected along the optical path of the illumination light beam, the projection area of ​​the filter 21 is much smaller than the projection area of ​​the illumination light beam. Specifically, the filter 21 in this embodiment deviates from the optical axis of the illumination lens 23. For example, in this embodiment, the filter 21 tries to ensure that any structure of the filter 21 is not collinear with the optical axis of the illumination lens 23, so that the filter 21 avoids the optical path of the illumination light beam as much as possible, so that the illumination light beam obtained by the display chip 900 is relatively uniform, and the quality of the projection picture formed by the final projection light beam is ensured, and the projection picture is prevented from having low color uniformity or yellowing and darkening at the edge of the picture. In addition, in this embodiment, when the display chip 900 receives the illumination light beam and generates a projection light beam to transmit to the space between the reflector 40 and the light guide system 20, the filter 21 is located outside the optical path of the projection light beam to avoid direct influence on the projection picture.

[0045] See also Figure 2 In this embodiment, the optical axis of the illumination lens 23 is substantially parallel to the rotation axis of the fluorescent color wheel 30 and is spaced apart, that is, the optical axis of the illumination lens 23 and the normal of the fluorescent color wheel 30 are substantially perpendicular. This arrangement of the embodiment enables the laser beam to be transmitted to the fluorescent color wheel 30 substantially in a direction perpendicular to the surface of the fluorescent color wheel 30, and the transmission direction of the illumination beam is substantially consistent with the optical axis direction of the illumination lens 23, thereby reducing the scattering of the illumination beam, allowing the illumination beam to be transmitted to the illumination lens 23 as much as possible, thereby enabling the reflector 40 to receive more illumination beams, thereby improving the projection effect of the lighting device.

[0046] See also Figure 1 , Figure 2 and Figure 5The light guiding system 20 in this embodiment may further include a light homogenizer 24, which is located on the optical path of the laser beam, so that the laser beam is transmitted to the fluorescent color wheel 30 after being homogenized by the light homogenizer 24. Specifically, the light homogenizer 24 in this embodiment is located between the illumination lens 23 and the fluorescent color wheel 30, that is, the light homogenizer 24 is located 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 that are arranged opposite to each other, the first end face 241 faces the reflector 40, that is, 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 transmitted into the light homogenizer 24 via the first end face 241, and the laser beam is diverged to the fluorescent color wheel 30 via the second end face 242 after being homogenized by the light homogenizer 24. Then the corresponding fluorescent excitation area 31 reflects the illumination light beam, and after the illumination light beam is transmitted into the light homogenizer 24 via the second end face 242, it is transmitted to the illumination lens 23 via the first end face 241, and the illumination light beam is transmitted to the reflector 40 after the convergence of the illumination lens 23. In this embodiment, the light homogenizer 24 is provided so that the laser beam with a light intensity of Gaussian distribution can be transmitted to the fluorescent reflection area on the fluorescent color wheel 30 after the light homogenization treatment. On the one hand, the laser beam is more uniform after the light homogenization treatment, so that the illumination light beam reflected by the fluorescent color wheel 30 also has the advantage of being more uniform, which can ensure the display effect of the final projection picture; on the other hand, after the light homogenization treatment, the light intensity of the high-intensity laser beam is weakened to a certain extent, which can avoid the thermal quenching phenomenon of the fluorescent powder sheet on the fluorescent excitation area 31 under the action of the laser beam with a higher power density, avoid damage to the fluorescent color wheel 30, and extend the service life of the fluorescent color wheel 30 and the projection device 1000.

[0047] See also Figure 1 and Figure 2 In the present 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, and prevent 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 collection efficiency of the fluorescence by the light homogenizer 24. Therefore, the light homogenizer 24 can efficiently collect the light of the illumination beam excited by the fluorescent color wheel 30, reduce the loss of light, and improve the illumination efficiency and brightness of the projection light source system 100.

[0048] See also Figure 2 and Figure 5In this embodiment, the ratio between the first end face 241 and the second end face 242 of the light homogenizer 24 is 6.25:1, that is, the area of ​​the first end face 241 is larger than the area of ​​the second end face 242. The first end face 241 of this embodiment corresponds to the illumination lens 23, and the area of ​​the first end face 241 is set to be larger and wider so that the light homogenizer 24 can receive more laser beams, i.e., light sources. The second end face 242 corresponds to the fluorescent color wheel 30, and the area of ​​the second end face 242 is set to be smaller and narrower, so that the laser beam emitted from the second end face 242 is thinner, which can avoid excessive divergence of the laser beam. Combined with the foregoing, the laser beam of this embodiment is roughly transmitted perpendicular to the fluorescent color wheel 30, and the distance between the fluorescent color wheel 30 and the second end face 242 of the light homogenizer 24 is small, so that the second end face 242 can effectively receive the illumination beam reflected by the fluorescent color wheel 30.

[0049] The light homogenizer 24 in this embodiment is a truncated pyramid structure, wherein the first end face 241 is a rectangle, and the length ratio of the two adjacent sides of the first end face 241 is 2:1; the second end face 242 is also a rectangle, and the length ratio of the two adjacent sides of the second end face 242 is 2:1. The long side of the first end face 241 is parallel to the long side of the second end face 242, and the ratio between the two is 2.5:1; the short side of the first end face 241 is parallel to the short side of the second end face 242, and the ratio between the two is 2.5:1. In other embodiments, the light homogenizer 24 can be a truncated pyramid structure.

[0050] See also Figure 1 and Figure 2 , combined with the above description of 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 a 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, and after the light homogenization processing by the light homogenizer 24, it is transmitted to one of the fluorescent lights on the fluorescent color wheel 30. The excitation area 31 has a fluorescent powder layer of a certain color on the fluorescent excitation area 31. The fluorescent powder layer of the color reflects an illumination light beam of the color after being excited. 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 is subjected to color adjustment processing or convergence processing by the projection lens 800, and is finally projected onto the projection surface.

[0051] See also Figure 6In this embodiment, multiple components need to be adjusted and installed at an angle so that the laser beam, the illumination beam, and the projection beam are conducted according to the optical path described above. This embodiment will describe 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 is roughly a cube structure. First, a right-handed coordinate system is determined based on the three edges of the display chip 900 that intersect each other. The length side A of the display chip 900 extends along the α-axis direction, the width side B of the display chip 900 extends along the β-axis direction, and the thickness side C of the display chip 900 extends along the γ-axis direction. Multiple components are introduced into the right-handed coordinate system.

[0052] See also Figure 1 In this embodiment, the monochromatic laser emitter 11 emits a laser beam. In the initial state, the laser beam extends along the positive direction of the γ axis. Then, the monochromatic laser emitter 11 rotates 38° counterclockwise around the α axis (counterclockwise in the right-hand coordinate, the same below) to switch to the target state. In this embodiment, when the focusing lens 22 is in the initial state, the optical axis of the focusing lens 22 is parallel to the γ axis. In the target state, the optical axis of the focusing lens 22 and the optical path of the laser beam are collinear. The filter 21 in this embodiment is a cube. In the initial state, the normal of 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. Then, the filter 21 rotates counterclockwise around the α axis at an angle greater than or equal to 77° and less than or equal to 78°, and rotates counterclockwise around the β axis at an angle greater than or equal to 0° and less than or equal to 2° to switch to the target state. In this embodiment, when the illumination lens 23 is in the initial state, the optical axis of the illumination lens 23 is parallel to the γ axis, and then the illumination lens 23 rotates 116° counterclockwise around the α axis to switch to the target state. In this embodiment, when the truncated pyramid-shaped light homogenizer 24 is in the initial state, the normal of the first end face 241 is parallel to the γ axis, and the length side of the first end face 241 is parallel to α, and then the light homogenizer 24 rotates 116° counterclockwise around the α axis to switch to the target state. In this embodiment, when the fluorescent color wheel 30 is in the initial state, 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 and the optical axis of the illumination lens 23 are arranged in parallel. In this embodiment, when the reflector 40 is in the initial state, the reflective concave surface 41 of the reflector 40 opens toward the positive direction of the γ axis, and the optical axis of the reflective concave surface 41 is parallel to the γ axis, and then the reflector 40 rotates 125° counterclockwise around the α axis to switch to the target state. The coordinate system in this embodiment is established based on the display chip 900, and the display chip 900 does not change its angle in this coordinate system. In this embodiment, when the projection lens 800 is in the initial state, the main optical axis of the projection lens 800 is parallel to the γ axis, and the projection lens 800 does not change its angle. Only the angle changes between the various components are involved here, and the positional relationship between the various components can be referred to in the previous text.

[0053] In summary, the projection light source system 100 provided in this embodiment includes a light source module 10 for emitting a laser beam, and a light guide system 20, a fluorescent color wheel 30 and a reflector 40 located on 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 can adjust 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 can rotate around its rotation axis, and the fluorescent color wheel 30 includes a plurality of fluorescent excitation areas 31 of different colors, and a plurality of different fluorescent laser areas 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, and the plurality of fluorescent excitation areas 31 can be rotated in sequence to a position corresponding to the laser beam so as to receive the laser beam, and each fluorescent excitation area 31 emits an illumination beam under the excitation of the laser beam, and the illumination beam is used to be transmitted to the display chip 900. Among them, the color of the illumination beam emitted by each fluorescent excitation area 31 is different.

[0054] The reflector 40 in this embodiment is located on the optical path of the illumination beam and is arranged corresponding to the display chip 900, so that the reflector 40 can reflect the illumination beam to the display chip 900 after receiving the illumination beam. The reflector 40 in this embodiment is arranged opposite to the fluorescent color wheel 30, which can effectively simplify the light path of the illumination beam and shorten the transmission distance of the illumination beam, and can also reduce the space jointly occupied by the fluorescent color wheel 30 and the reflector 40. Further, the light guide system 20 in this embodiment is arranged between the fluorescent color wheel 30 and the reflector 40, so that the space jointly occupied by the light guide system 20, the fluorescent color wheel 30 and the reflector 40 is small, which can further reduce the space occupied by the projection light source system 100. Under the arrangement of this embodiment, part of the optical path of the illumination beam and the laser beam overlaps, that is, there is an overlap between the illumination beam between the fluorescent color wheel 30 and the reflector 40 and the laser beam between the light guide system 20 and the fluorescent color wheel 30.

[0055] 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.

[0056] 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, so it should be interpreted as "including but not limited to"; "substantially" means that those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0057] In the description of the present application, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", and "inside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are merely simplified descriptions for the convenience of describing the present application. They 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, and therefore should not be understood as a limitation on the present application.

[0058] In this application, unless otherwise clearly specified or limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be internal communication between two elements, or it can be only surface contact. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0060] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0061] 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 it. 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: The reflector 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 reflector 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, characterized in that: The ratio between the area of ​​the first end surface and the area of ​​the second end surface is 6.25:1, or / and The first end surface is rectangular, and the length ratio of two adjacent sides of the first end surface is 2:1; or / and The second end surface is rectangular, and the length ratio of two adjacent sides of the second end surface is 2:

1.

10. The projection light source system according to any one of claims 1 to 5, characterized in that: The reflector 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°.

11. A projection device, characterized in that: include: Display chip; as well as The projection light source system according to any one of claims 1 to 10, wherein the projection light source system is used to form the illumination light beam, and the display chip is arranged on the optical path of the illumination light beam.

12. The projection device according to claim 11, characterized in that: The display chip is arranged corresponding to the reflector, the illumination beam is transmitted from the reflector 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 reflector and the fluorescent color wheel, and intersects with the illumination beam.

13. The projection device according to claim 11 or 12, characterized in that: The projection device further comprises a projection lens, and the display chip and the projection lens are arranged and spaced apart 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.

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