CN113311655A

CN113311655A - Projection light source and projection apparatus

Info

Publication number: CN113311655A
Application number: CN202110679835.4A
Authority: CN
Inventors: 颜珂
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2021-06-18
Filing date: 2021-06-18
Publication date: 2021-08-27
Anticipated expiration: 2041-06-18
Also published as: CN113311655B

Abstract

The application discloses projection light source and projection equipment belongs to the photoelectric technology field. The light combining lens in the projection light source comprises a reflection area and two transmission areas which are respectively positioned at two sides of the reflection area; the fluorescent wheel comprises a first area and a second area, and the second area is provided with a light diffusion part; the laser is used for emitting a plurality of laser beams, and the laser beams emit to the two transmission areas of the light combining lens to enable the laser beams to transmit to the converging lens; the converging lens converges the laser light to the fluorescent wheel; the fluorescent wheel is configured to rotate around the rotating shaft, and different areas in the fluorescent wheel are irradiated by the converged laser light during the rotation of the fluorescent wheel; the first area is excited to emit laser, and the fluorescence passes through the convergent lens and is emitted to the reflecting area; the light diffusion part of the second area diffuses the converged laser light, and the diffused laser light passes through the converging lens and is emitted to the reflecting area; the reflective region reflects the incident light in a target direction. The application solves the problem that the volume of a projection light source is large. The application is used for light emission.

Description

Projection light source and projection apparatus

Technical Field

The application relates to the field of photoelectric technology, in particular to a projection light source and projection equipment.

Background

With the development of electro-optical technology, there is an increasing demand for miniaturization of projection light sources in projection apparatuses.

In the related art, as shown in fig. 1, a projection light source includes: laser 001, dichroic mirror 002, first collimating lens group 003, fluorescent wheel 004, light pipe 005 and relay circuit system including second collimating lens group 006, first mirror 007, first collimating lens 008, second mirror 009, second collimating lens 010, third mirror 011 and third collimating lens 012. The dichroic mirror 002 and the fluorescent wheel 004 are sequentially arranged on the light emitting side of the laser 001 along the light emitting direction (for example, the x direction) of the laser 001, and the arrangement direction (for example, the y direction) of the light guide 005 and the dichroic mirror 002 is perpendicular to the light emitting direction of the laser 001. The dichroic mirror 002 serves to transmit blue light and reflect red and green light. The laser 001 may emit blue laser light toward the dichroic mirror 002, and the blue laser light passes through the dichroic mirror 002 toward the first collimating lens group 003 and then toward the fluorescent wheel 004 through the first collimating lens group 003. The luminescent wheel 004 comprises a luminescent region and a transmissive region, the luminescent wheel 004 can rotate around a rotating shaft parallel to the light emitting direction, and blue laser light is emitted to different regions of the luminescent wheel 004 during the rotation of the luminescent wheel 004. When the blue laser light is emitted to the transmission region of the fluorescent wheel 004, the blue laser light is emitted to the relay circuit system through the transmission region, and is further transmitted to the light guide 005 through the relay circuit system. When the blue laser light is emitted to the fluorescent region of the fluorescent wheel 004, the fluorescent region is excited to emit red light and green light, and the red light and the green light pass through the first collimating lens group 003 to be emitted to the dichroic mirror 002, and are reflected to the light guide 005 by the dichroic mirror 002. Thus, the light guide 005 can receive red, green and blue laser beams, and can project images of the light received by the light guide 005.

However, the related art projection light source has many components, resulting in a large volume of the projection light source.

Disclosure of Invention

The application provides a projection light source and projection equipment, can solve the great problem of projection light source's volume. The technical scheme is as follows:

in one aspect, a projection light source is provided, the projection light source comprising: the device comprises a laser, a light combining lens, a converging lens and a fluorescent wheel; the light combining lens comprises a reflection area and two transmission areas which are respectively positioned at two sides of the reflection area; the fluorescent wheel comprises a first area and a second area, and the second area is provided with a light diffusion part;

the laser is used for emitting a plurality of laser beams, the laser beams irradiate the two transmission areas, and the transmission areas are used for transmitting the incident laser beams to the converging lens;

the converging lens is used for converging the incident laser to the fluorescent wheel;

the fluorescent wheel is configured to rotate around a rotating shaft, and different areas in the fluorescent wheel are irradiated by the converged laser light during the rotation of the fluorescent wheel;

when the converged laser light is emitted to the first region, the first region is excited to emit fluorescence so that the fluorescence is emitted to the reflection region through the converging lens;

when the converged laser light is emitted to the second region, the light diffusion part diffuses the converged laser light so that the diffused laser light is emitted to the reflection region through the converging lens;

the reflecting area is used for reflecting the incident light along the target direction.

In another aspect, a projection apparatus is provided, the projection apparatus comprising: the projection light source, the light valve and the lens;

the projection light source is used for emitting laser to the light valve, the light valve is used for modulating the incident laser and then emitting the modulated laser to the lens, and the lens is used for projecting the incident laser to form a projection picture.

The beneficial effect that technical scheme that this application provided brought includes at least:

in the projection light source provided by the application, the light combining lens comprises a transmission area and a reflection area, the fluorescent wheel comprises a first area and a second area, laser emitted by the laser can emit to the fluorescent wheel through the transmission area of the light combining lens, and then the first area is excited to emit fluorescent light when the laser emits to the first area of the fluorescent wheel, and the fluorescent light is reflected along a target direction on the light combining lens. When the laser light is emitted to the second area of the fluorescent wheel, the laser light is reflected by the second area to the light combining lens and then is reflected by the reflecting area of the light combining lens along the target direction. Therefore, a relay loop system is not arranged, the light combination of laser and fluorescence can be realized only through a light combination lens, and the volume of the projection light source is small.

In addition, the transmission areas in the light combining lens are respectively positioned at two sides of the reflection area, and the light energy of the light beam which is emitted to the light combining lens is higher in the middle part and lower in the edge part, so that even if the light which is emitted to the light combining lens is emitted from the transmission area, the energy of the emitted light is smaller, and the light loss of the projection light source is smaller. The light diffusion part is arranged on the second area of the fluorescent wheel, and the laser can be diffused by the light diffusion part and then emitted to the light combining lens when being emitted to the second area of the fluorescent wheel, so that the light emitting angle range of the laser emitted from the fluorescent wheel is expanded. Because the light-emitting angle range of the fluorescence excited by the first area is larger, the light-emitting angle range of the laser and the fluorescence is ensured to be smaller, and the light mixing uniformity of the laser and the fluorescence is higher.

The laser projection equipment applying the projection light source is relatively beneficial to realizing the miniaturization of the optical engine structure of the laser projection equipment through the miniaturization of the projection light source, and can also bring convenience for other structures in the equipment, such as a heat dissipation structure or circuit board arrangement. And the light with higher light mixing uniformity is adopted to form a projection picture, and the display effect of the projection picture is better.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a projection light source provided in the related art;

fig. 2 is a schematic structural diagram of a projection light source provided in an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a fluorescent wheel provided in an embodiment of the present application;

FIG. 4 is a schematic structural diagram of another projection light source provided in the embodiments of the present application;

FIG. 5 is a schematic structural diagram of another projection light source provided in an embodiment of the present application;

FIG. 6 is a schematic structural diagram of another projection light source provided in an embodiment of the present application;

fig. 7 is a schematic structural diagram of a projection apparatus according to an embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a projection light source provided in the related art. As shown in fig. 1, the projection light source includes: laser 001, dichroic mirror 002, first collimating lens group 003, fluorescence wheel 004, relay loop system, and light pipe 005. Dichroic mirror 002, first collimating lens group 003, and luminescent wheel 004 are located at the light-emitting side of laser 001, and are arranged in order along the light-emitting direction of laser 001. The relay loop system includes: the second collimating lens group 006, the first mirror 007, the first collimating lens 008, the second mirror 009, the second collimating lens 010, the third mirror 011, and the third collimating lens 012. The second collimating lens group 006 and the first reflector 007 are located on a side of the fluorescence wheel 004 away from the laser 001, and are sequentially arranged along a light emitting direction (e.g., a y direction in fig. 1) of the laser 001. The first mirror 007, the first collimating lens 008, and the second mirror 009 are sequentially arranged in a direction opposite to a target direction (e.g., x direction in fig. 1) perpendicular to a light-emitting direction of the laser 001. The second reflector 009, the second collimating lens 010 and the third reflector 011 are arranged in order in the opposite direction to the light-emitting direction of the laser 001. The third reflecting mirror 011, the third collimating lens 012, the dichroic mirror 002, and the light pipe 005 are arranged in order along the target direction, and the dichroic mirror 002 is inclined toward the light pipe 005. The light pipe 005 is located at the light outlet of the projection light source.

The laser 001 may emit blue laser light, and the dichroic mirror 002 may transmit blue light. The blue laser light emitted from the laser 001 may be emitted to the fluorescent wheel 004 through the dichroic mirror 002 and the first collimating lens group 003. The fluorescent wheel 004 includes a fluorescent region having a fluorescent material that can emit fluorescent light (such as red fluorescent light and green fluorescent light) under irradiation of blue laser light and a transmissive region (not shown in fig. 1). The luminescent wheel 004 can rotate around a rotating shaft parallel to the light emitting direction of the laser 001, and blue laser can be emitted to different areas of the luminescent wheel 004 when the luminescent wheel 004 rotates. When the blue laser light is emitted to the transmission region of the fluorescent wheel 004, the blue laser light may be emitted to the first reflective mirror 007 through the transmission region and the second collimating lens group 006, and then reflected by the first reflective mirror 007 to be emitted to the second reflective mirror 009 through the first collimating lens 008. The blue laser light may then be reflected by the second mirror 009 to be directed to the third mirror 011 through the second collimating lens 010, and reflected by the third mirror 011 to be directed to the light guide 005 through the third collimating lens 012 and the dichroic mirror 002. As the fluorescent wheel 004 rotates, when the blue laser light emitted from the laser 001 is emitted to the fluorescent region of the fluorescent wheel 004, the blue laser light can excite the fluorescent material of the fluorescent region to emit fluorescent light toward the dichroic mirror 002. The dichroic mirror 002 can also reflect red light and green light, so the fluorescence can be reflected again on the dichroic mirror 002 to be directed to the light guide 005. In this way, the light guide 005 can receive the fluorescent light and the blue laser light, and the fluorescent light and the blue laser light can be mixed under the action of the light guide 005, so that the converging lens can use the mixed light for projection of the projection device.

However, the projection light source in the related art has a large volume, and the following embodiments of the present application provide a projection light source which has a small volume and a high uniformity of the laser light emitted from the projection light source, and is advantageous for displaying the projection image of the projection apparatus.

Fig. 2 is a schematic structural diagram of a projection light source according to an embodiment of the present application. As shown in fig. 2, the projection light source 10 may include: a laser 101, a light combining lens 103, a converging lens 104 and a fluorescent wheel 105.

The light combining lens 103 includes a reflection region and two transmission regions respectively located at two sides of the reflection region, for example, the light combining lens 103 includes a first transmission region 1031a, a second transmission region 1031b, and a reflection region 1032, and the first transmission region 1031a, the reflection region 1032, and the second transmission region 1031b may be sequentially arranged along an extending direction of the light combining lens. The fluorescent wheel 105 includes a first region and a second region, the second region is provided with a light-diffusing portion (the first region, the second region, and the light-diffusing portion are not shown in fig. 2), and the fluorescent wheel 105 is not provided with a light-transmitting region. The first region may be a fluorescent region and the second region may be a reflective region. The first region may be excited to fluoresce under irradiation of the laser light, and the second region may diffuse the incident laser light and reflect the incident laser light.

The laser 101, the light combining lens 103, the converging lens 104 and the fluorescent wheel 105 may be arranged in sequence along an auxiliary direction (e.g., the y direction in fig. 2). The laser 101 may emit a plurality of laser beams, and the plurality of laser beams may be emitted to two transmission regions in the light combining lens 103, and each transmission region may transmit the emitted laser beams to the condensing lens 104. Alternatively, the laser light emitted from the two transmission regions does not pass through the optical axis of the condenser lens 104. Optionally, the light spots formed on the converging lens 104 by the two laser beams respectively emitted from the two transmission regions may be symmetrical with respect to an optical axis h of the converging lens 104, or may not be symmetrical with respect to the optical axis h, which is not limited in this embodiment of the application.

Illustratively, the plurality of laser beams emitted by the laser 101 includes: a first laser beam L1 and a second laser beam L2. The first laser beam L1 is directed to the first transmissive area 1031a, and is directed to the condensing lens 104 through the first transmissive area 1031 a; the second laser beam L2 is directed to the second transmission region 1031b and is directed to the condensing lens 104 through the second transmission region 1031 b. The spot formed on the condensing lens 104 by the first laser beam L1 and the spot formed on the condensing lens 104 by the second laser beam L2 are symmetrical with respect to the optical axis of the condensing lens 104. In other words, the position of the mirror irradiated with the first laser beam L1 on the condensing lens 104 and the position of the mirror irradiated with the second laser beam L2 are symmetrical with respect to the optical axis h of the condensing lens 104.

The condensing lens 104 may condense the incident laser light toward the fluorescent wheel 105. The fluorescent wheel 105 is rotatable about the rotation axis Z, and during the rotation of the fluorescent wheel 105, different areas in the fluorescent wheel 105 are irradiated with the converged laser light (i.e., the laser light emitted from the converging lens 104). When the converged laser light is emitted to the first region of the fluorescent wheel 105, the first region is excited to emit fluorescent light having a color different from that of the incident laser light of the fluorescent wheel 105. The fluorescent light may be directed through a converging lens 104 toward the light combining optic 103, such as to a reflective region in the light combining optic 103. When the converged laser light is emitted to the second region in the fluorescent wheel 105, the light diffusion part disposed on the second region can diffuse the converged laser light, and the diffused laser light can be emitted to the light combining lens 103 through the converging lens 104 again, for example, to the reflection region of the light combining lens 103. The reflecting area of the light combining lens 103 can reflect the light emitted to the reflecting area by the converging lens 104 along the target direction; that is, the reflective region may reflect both the laser light and the fluorescent light emitted to the reflective region by the condensing lens 104 in a target direction, so as to realize mixing of the laser light and the fluorescent light.

In the embodiment of the application, the auxiliary direction is intersected with the target direction. Fig. 2 illustrates that the auxiliary direction is perpendicular to the target direction in the embodiment of the present application, and optionally, the included angle between the auxiliary direction and the target direction may also be an obtuse angle or an acute angle. Fig. 2 illustrates that the number of laser beams emitted by the laser is 2, and each laser beam is emitted to one transmissive area, alternatively, the number of laser beams emitted by the laser may be more than 2, and there may be multiple laser beams emitted by the laser emitted to the same transmissive area. Alternatively, the laser may include a plurality of rows of light emitting chips, and each laser light emitted from the laser may be emitted from one or more rows of light emitting chips.

When the first region on the fluorescence wheel 105 emits fluorescence under the excitation of the laser light, the region irradiated by the laser light in the first region emits light in all directions, and the side of the fluorescence wheel 105 away from the converging lens 104 does not transmit light, so the light emission angle of the region irradiated by the laser light in the first region can be approximately in the range of 0 to 180 degrees, and the region emits fluorescence like a lambertian body. The fluorescent light emitted from the first region may form a spot on the condenser lens that is close to covering the entire mirror surface of the condenser lens. In the embodiment of the application, the second region is provided with the light diffusion structure, so that after the laser light is emitted to the second region, the laser light is reflected by the second region and diffused by the light diffusion structure, and the emitting angle range of the laser light is increased relative to the incident angle range. The laser light can be emitted to a larger range after being emitted to the second area so as to be emitted to the convergent lens, and the position irradiated by the laser light on the second area is also equivalent to a point light source similar to a lambertian body. Alternatively, the spot formed on the converging lens after the laser light is reflected by the second region may be close to the entire mirror surface covering the converging lens. Therefore, the difference between the light-emitting angle range of the fluorescence emitted by the first region and the light-emitting angle range of the laser emitted by the second region in the fluorescence wheel can be reduced, and the light mixing effect of the fluorescence and the laser can be further optimized.

In the embodiment of the present application, since the first region and the second region of the fluorescent wheel 105 are similar to lambertian when emitting light, the light energy of the middle portion of the emitted light beam is high, and the light energy of the edge portion is low. Therefore, even if the edge portion of the light emitted to the light combining lens 103 through the first region or the second region of the fluorescent wheel is emitted from the transmissive region and cannot be used for forming a projection screen, the loss of the light of the projection light source is small because the energy of the emitted light in the entire light beam is small.

In summary, in the projection light source provided in the embodiment of the present application, the light combining lens includes the transmission area and the reflection area, the fluorescent wheel includes the first area and the second area, the laser emitted by the laser device can be emitted to the fluorescent wheel through the transmission area of the light combining lens, and then the first area is excited to emit fluorescent light when the laser is emitted to the first area of the fluorescent wheel, and the fluorescent light is reflected on the light combining lens along the target direction. When the laser light is emitted to the second area of the fluorescent wheel, the laser light is reflected by the second area to the light combining lens and then is reflected by the reflecting area of the light combining lens along the target direction. Therefore, a relay loop system is not arranged, the light combination of laser and fluorescence can be realized only through a light combination lens, and the volume of the projection light source is small.

In addition, the transmission areas in the light combining lens are respectively positioned at two sides of the reflection area, and the light energy of the light beam which is emitted to the light combining lens is higher in the middle part and lower in the edge part, so that even if the light which is emitted to the light combining lens is emitted from the transmission area, the energy of the emitted light is smaller, and the light loss of the projection light source is smaller. The light diffusion part is arranged on the second area of the fluorescent wheel, and the laser can be diffused by the light diffusion part and then emitted to the light combining lens when being emitted to the second area of the fluorescent wheel, so that the light emitting angle range of the laser emitted from the fluorescent wheel is expanded. Because the light-emitting angle range of the fluorescence excited by the first area is larger, the light-emitting angle range difference between the laser and the fluorescence is smaller, the light mixing effect of the laser and the fluorescence is better, the light with the better light mixing effect is adopted to form a projection picture, and the display effect of the projection picture is also better.

Based on the above-mentioned projection light source structure of the embodiment, the fluorescent wheel 105 will be described with reference to the accompanying drawings:

fig. 3 is a schematic structural diagram of a fluorescent wheel provided in an embodiment of the present application, and fig. 3 is a top view of the fluorescent wheel in fig. 2. Referring to fig. 2 and 3, the fluorescent wheel 105 can rotate around the rotation axis Z, so that the laser light (e.g., including the first laser beam and the second laser beam) converged by the converging lens 104 to the fluorescent wheel 105 is switched between the first area 1051 and the second area 1052. Alternatively, the fluorescent wheel 105 may be in a ring shape, a ring surface of the ring may intersect with the auxiliary direction (y direction), the rotation axis Z may be parallel to the y direction, and the rotation axis Z may pass through a center of the ring and be perpendicular to the ring surface of the ring. Alternatively, the fluorescent wheel 105 may include a light-reflecting substrate on which a partial region may be provided with a fluorescent material (e.g., phosphor), and a partial region may be provided with a light-diffusing portion. The region where the fluorescent material is provided is the first region 1051 of the fluorescent wheel 105, and the region where the light-diffusing part is provided is the second region 1052 of the fluorescent wheel 105. The fluorescent material of each color may be excited with laser light of that color.

When the laser beam is emitted to the first region 1051, the phosphor thereon may be excited to emit fluorescent light of a corresponding color, which is different from the color of the laser beam, and the fluorescent light may be reflected by the reflective substrate toward the condensing lens 104. Illustratively, at least a green fluorescent material may be disposed in the first region of the fluorescent wheel 105. At least one of a red fluorescent material and a yellow fluorescent material may be disposed in the first region. The fluorescent light emitted by the first region of the fluorescent wheel 105 may be green fluorescent light, red fluorescent light, or other colors of fluorescent light, such as yellow fluorescent light. Alternatively, the fluorescence may be a laser. The color of the fluorescence is different from the color of the laser light emitted by the laser 101, e.g., the laser 101 may emit blue laser light. Optionally, the color of the laser light emitted by the laser 101 may also be other colors, which is not limited in this embodiment.

For example, the first region 1051 in the fluorescent wheel 105 in the embodiment of the present application may include at least one sub-region, and each sub-region may be provided with a fluorescent material of one color. When the first region 1051 includes a plurality of sub-regions, the plurality of sub-regions and the second region 1052 may be arranged circumferentially. The first region 1051 may, for example, comprise two sub-regions G1 and G2. The fluorescent wheel 105 can rotate in the w direction or in the opposite direction of the w direction about the rotation axis Z. For example, the two sub-regions may include a green fluorescent material and a red fluorescent material, respectively, or the two sub-regions may include a green fluorescent material and a yellow fluorescent material, respectively, or the two sub-regions may include a green fluorescent material and an orange fluorescent material, respectively. It should be noted that, in the embodiments of the present application, only the areas of the sub-regions in the first region are equal, and the area of the second region is also equal to the area of any sub-region. Alternatively, the areas of the sub-regions and the second region in the first region of the fluorescence wheel may be different, and the areas of the sub-regions and the second region of the fluorescence wheel may be designed according to the ratio of the emitted light to the desired light.

When the laser light is emitted to the second zone 1052 of the fluorescent wheel 105, the light can be diffused by the light diffusion part thereon and reflected by the reflective substrate toward the condensing lens 104. Alternatively, the light-diffusing part provided on the second region in the fluorescent wheel 105 may include a diffusion sheet or a diffuse reflector. The diffuse reflector may be a diffuse reflective coating, or a diffuse reflective plate. For example, a diffusion sheet may be attached to the area corresponding to the second region 1052 of the reflective substrate, or a diffuse reflection coating may be applied. Optionally, the diffusion sheet may be a large-angle diffusion sheet, that is, the diffusion angle of the diffusion sheet to light may be greater than an angle threshold; the diffuse reflective coating may be a high reflectivity diffuse reflective coating, i.e., the diffuse reflective coating may have a reflectivity for light greater than a threshold reflectivity. Alternatively, since the diffuse reflector may directly reflect the light, if the light diffusion portion is a diffuse reflector, the second region 1052 on the substrate of the fluorescent wheel 105 may not have a light reflecting function.

The fluorescent light emitted from the first region 1051 of the fluorescent wheel 105 and the laser light emitted from the second region 1052 of the fluorescent wheel 105 can both be emitted toward the condenser lens 104 in a wide range of light emission angles. Alternatively, the laser light and the fluorescent light may both be parallel light after passing through the converging lens 104. Since the first region and the second region in the fluorescent wheel are similar to lambertian bodies when emitting light, and emit light towards the whole surface of the convergent lens, the convergent lens can collimate the incident light, so that the light is emitted in a whole beam similar to parallel light. Optionally, in the embodiment of the present application, the converging lens 104 is only one convex lens, and optionally, the converging lens 104 may also be composed of a plurality of lenses, so as to improve the converging effect of the converging lens on light.

Fig. 4 is a schematic structural diagram of another projection light source provided in an embodiment of the present application. As shown in fig. 4, based on fig. 2, the laser 10 may further include a light splitting device 106, the laser 101 may emit laser light to the light splitting device 106, and the light splitting device 106 may split the laser light emitted by the laser 101 into a plurality of laser light beams and emit the laser light beams to the two transmission areas of the light combining lens 103. Illustratively, as shown in fig. 4, the laser 101 and the light splitting device 106 may be arranged in sequence along a target direction (e.g., x direction in fig. 4). The light splitting device 106, the light combining lens 103, the converging lens 104 and the fluorescent wheel 105 may be arranged in sequence along an auxiliary direction (e.g., y direction in fig. 4). The laser 101 may emit laser light to the beam splitter 106, and the beam splitter 106 may split the laser light emitted from the laser 101 into a plurality of laser beams and emit the laser beams to two transmission regions in the light combining lens 103.

The light splitting device 106 in the projection light source is described below with reference to the drawings:

optionally, the light splitting device 106 includes a plurality of light splitting mirrors, and the distances between the light splitting mirrors and the light emitting surface of the laser 101 are all different. The distance between the spectroscope and the light-emitting surface of the laser may include: the distance between any point of the spectroscope close to the surface of the laser and the light-emitting surface. The plurality of spectroscopes in the spectroscope can satisfy the following conditions: in any two spectroscopes, at least part of orthographic projection of one spectroscope on the light-emitting surface of the laser is positioned outside orthographic projection of the other spectroscope on the light-emitting surface of the laser; the minimum separation of a point in one beam splitter from the laser may be greater than the maximum separation of a point in another beam splitter from the laser. Therefore, the distance between all points in the surface of each spectroscope close to the laser and the laser is different from the distance between any point in the surface of other spectroscopes close to the laser and the laser.

Each beam splitter is configured to receive a portion of the laser light emitted from the laser 101, and reflect the received portion of the laser light as a beam of laser light, for example, to a transmission area in the beam combiner 103, so as to split the laser light emitted from the laser 101 into a plurality of laser light beams, and to emit the plurality of laser light beams to two transmission areas in the beam combiner 103. Alternatively, each surface of the beam splitter may be a reflective surface, or only the surface of the beam splitter facing the laser 101 may be a reflective surface. Alternatively, the distance between the split laser beams can be adjusted by adjusting the position of each beam splitter. The number of beam splitters in the beam splitter 106 is the same as the number of laser beams obtained by splitting the laser beam. Optionally, the light splitting device may also implement light splitting in other ways, and the embodiment of the present application is not limited.

Illustratively, as shown in fig. 4, the beam splitter 106 includes two beam splitters,

beam splitters

1061 and 1062, respectively. The laser 101 may emit only one laser beam, the one laser beam may be emitted to the

beam splitters

1061 and 1062, each beam splitter may reflect a portion of the one laser beam emitted to the beam splitter, and the two beam splitters may split the one laser beam into the first laser beam L1 and the second laser beam L2. The first laser beam L1 may be directed to the first transmissive region 1031a and directed to the condensing lens 104 through the first transmissive region 1031 a; the second laser beam L2 may be directed to the second transmissive area 1031b and directed to the condensing lens 104 through the second transmissive area 1031 b. As shown in fig. 4, the larger the distance between the two beam splitters in the projection light source in the x direction (i.e., the light emitting direction of the laser 101), the larger the distance between the two laser beams obtained by splitting the laser light emitted by the laser 101. Therefore, the distance between the laser beams emitted by the beam splitters can be adjusted by adjusting the distance between the beam splitters in the light emitting direction of the laser 101.

It should be noted that, in fig. 4, the light splitting device 106 includes two light splitters, so as to divide the laser light emitted from the laser 101 into two laser beams that are respectively emitted to two transmission regions in the light combining lens 103. Optionally, the optical splitter may also include three, four, or even more optical splitters, so as to divide the laser light emitted by the laser 101 into three laser beams, four laser beams, or even more laser beams, and further enable multiple laser beams in the divided laser beams to emit to the same transmission region.

Fig. 5 is a schematic structural diagram of another projection light source provided in an embodiment of the present application. As shown in fig. 5, the projection light source 10 may further include two beam-reducing components 102 on the basis of fig. 4. The beam-reducing component 102 is located between the light-splitting device 106 and the light-combining lens 103. The beam reduction unit 102 is used to reduce the incident laser beam, that is, to reduce the incident laser beam and then emit the laser beam. The two beam-reducing components 102 may correspond to two transmissive areas in the light-combining lens 103. The laser beam emitted from the laser 101 can be condensed by the condensing member 102, and then emitted to the transmission region of the condensing lens 103 corresponding to the condensing member 102. In the embodiment of the present application, the projection light source 10 includes the beam-reducing component 102 on the basis that the light-splitting device 106 is included, optionally, the projection light source 10 may also include the beam-reducing component 102 when the light-splitting device 106 is not included, and the embodiment of the present application is not limited.

Optionally, the plurality of beam splitters in the beam splitting device 106, the plurality of beam reduction components 102, and the plurality of transmissive areas in the beam combining lens 103 correspond to one another. The laser beam emitted by each beam splitter is reduced by the corresponding beam reducing component 102 and then emitted to the corresponding transmission area. Illustratively, the number of beam splitters, the number of beam reduction parts 102 and the number of transmission areas in the beam combination lens 103 are all 2, and the laser light emitted by the laser 101 is divided into a plurality of laser lights by the beam splitting device 106, which includes: a first laser beam L1 and a second laser beam L2. The first laser beam L1 is attenuated by the corresponding beam attenuating member 102 and directed to the first transmissive region 1031a, and directed to the condensing lens 104 through the first transmissive region 1031 a; the second laser beam L2 is attenuated by the corresponding beam attenuating member 102, directed to the second transmission region 1031b, and directed to the condensing lens 104 through the second transmission region 1031 b.

In the embodiment of the present application, each laser beam split by the optical splitter 106 can be shrunk by the independent beam shrinking component 102, so that it can be ensured that the difference of the beam shrinking effect of each laser beam is small, and the beam shrinking effect of each laser beam is good. And even if a certain beam-reducing component has a problem, other beam-reducing components can still work normally, and the risk that the projection light source cannot be used completely due to the beam-reducing component is reduced.

Alternatively, the beam-reducing member 102 may include one convex lens 1021 and one concave lens 1022 arranged in sequence in the auxiliary direction. The laser light emitted from the beam splitter can be emitted to the convex lens 1021, the convex lens 1021 can converge the emitted laser light and emit the converged laser light to the concave lens 1022, and the concave lens 1022 can collimate the emitted laser light and emit the collimated laser light to the transmission area corresponding to the beam reduction component 102 in the light combination film 103, so that the beam reduction of the laser light by the beam reduction component 102 is realized.

The light combining lens 103 is described below with reference to fig. 2 to 5:

the mirror surface of the light combining lens 103 may be inclined to ensure that the light emitted from the converging lens is reflected in the target direction. Light (such as laser light or fluorescent light) emitted from the condenser lens 104 to the light combining lens 103 is similar to parallel light, and can be emitted from the condenser lens 104 over the entire surface. The light emitted to the light combining lens 103 is emitted not only to the reflection region in the light combining lens 103 but also to the transmission region in the light combining lens 103. The reflection area in the light combining lens 103 may reflect the laser light and the fluorescence, and the embodiment of the present application is not limited to whether the reflection area reflects light with a color different from that of the laser light and the fluorescence. For example, the reflective region may be a full spectrum highly reflective film, i.e., reflecting all colors of light. The light combining optic 103 may have opposing first and second faces, the first face may face the laser 101, and the second face may face the converging lens 104. The first surface is also the light incident surface of the light combining lens 103, and the second surface is also the light emitting surface of the light combining lens 103. Alternatively, the light from the condenser lens 104 to the light combining lens 103 may be reflected at the second surface.

Alternatively, the transmissive region in the x-ray combining lens 103 may have dichroism. The transmissive region may transmit laser light reflected by the second region 1052 of the fluorescent wheel 105 (also laser light emitted by the laser 101) and reflect fluorescence light that is excited by the first region 1051 of the fluorescent wheel 105. Alternatively, the transmissive region may reflect light of a color different from the laser color. Illustratively, the transmissive region may be configured to transmit blue light and reflect red and green light. The fluorescence excited in the first region 1051 of the fluorescence wheel 105 can be totally reflected along the target direction after being emitted to the light combining lens 103, so as to be used for forming a projection picture later, and the utilization rate of the fluorescence is ensured. Alternatively, the transmissive region in the light combining lens 103 may also be transmissive for all light.

For example, with continuing reference to fig. 2, in the embodiment of the present application, the light combining lens 103 may include two transmissive areas and one reflective area, and the two transmissive areas are respectively located at two ends of the reflective area. Alternatively, the area of the transmissive region in the light combining lens 103 may be smaller than the area of the reflective region. If the area of each transmissive region in the combiner lens 103 is smaller than the area of the reflective region, the total area of all transmissive regions may be smaller than the area of the reflective region. Alternatively, the area of each transmissive region may be less than or equal to 1/4 of the area of the reflective region. Alternatively, the areas of the transmission regions in the light combining lens 103 are equal, or the areas of the transmission regions may be different. The area of the transmission region in the light combining lens 103 only needs to be sufficient to transmit the incident laser light. The laser beam emitted by the laser 101 can be thinned after being reduced by the beam reducing component 102, and the area of the transmission area in the light combining lens 102 can be reduced as the laser beam is thinner. Optionally, the beam-shrinking component 102 is a high-magnification telescope system, which can shrink the beam to a greater extent; the area of the transmissive region in the combiner lens 103 can be small. Further, even if the laser light emitted from the condenser lens 104 is emitted to the transmission region in the light combining lens 103 and is transmitted through the transmission region, since the area of the transmission region is small, only a small amount of laser light is wasted, and the utilization rate of the laser light is high.

Optionally, an antireflection film is disposed on a surface (i.e., the first surface) of the light combining lens 103 close to the beam shrinking component 102 to increase the laser transmittance of the light combining lens 103. For example, the antireflection film can only increase the transmittance of laser (such as blue laser) emitted by a laser, and the antireflection film is a blue light antireflection film; or the anti-reflection film can increase the transmittance of the full-spectrum light, and the anti-reflection film is a full-spectrum anti-reflection film. The surface of the light combining lens 103 close to the beam-shrinking component 102 can be provided with an antireflection film on the whole surface. Alternatively, since only the transmission region of the light combining lens 103 is used for transmitting laser light, an antireflection film may be provided only in the transmission region. Therefore, the laser transmitted from the light combining lens 103 is more, the loss of the laser is less, and the utilization rate of the laser is improved.

Optionally, the surface of the light combining lens 103 close to the beam-shrinking component 102 is provided with a light diffusion structure. The light diffusing structure may be a diffuser, or a structure composed of a plurality of micro-prism structures, or include a plurality of parallel stripe-shaped protrusions, for example. The light diffusion structure is a small-angle diffusion structure, and the diffusion angle of the light diffusion structure to light is smaller than an angle threshold value. The light diffusion structure can diffuse the laser emitted to the light combining lens 103 to ensure that the energy distribution uniformity of the laser emitted from the light combining lens 103 is high, and further, after the laser is emitted to the first area of the fluorescent wheel 105, the energy distribution of the fluorescent light emitted by the excited first area is uniform.

In an alternative implementation manner of the light combining lens, functional film layers may be disposed in different areas on the light-transmitting substrate to obtain the transmission area and the reflection area in the light combining lens. For example, for the reflection area, the reflection area of the light combining lens 103 may have a coating. The coating film can be a full-wave band reflecting film, or the coating film is a reflecting film aiming at a red wave band, a green wave band and a blue wave band. The coating may be located on a side of the beam combining lens 103 close to the beam shrinking component 102, or may be located on a side of the beam combining lens 103 far from the beam shrinking component 102, which is not limited in this embodiment. For the transmission area, the side of the beam combining lens 103 close to the beam reduction member 102 is provided with a dichroic film at least on the surface of the transmission area. The dichroic film may be used to transmit blue light and reflect red and green light. In another alternative implementation of the light combining lens, the reflection area of the light combining lens 103 may also be directly made of a reflective material. Alternatively, the transmissive region in the x-ray combining lens 103 can be directly made of a dichroic material. At this time, the plating film and the dichroic film may not be provided.

The laser 101 is described below with reference to the accompanying drawings:

in the embodiment of the present application, the projection light source may include a laser 101, and the plurality of laser beams respectively emitted to the plurality of beam-reducing parts 102 are all emitted by the same laser 101. The Laser 101 may be a multi-chip Laser Diode (MCL) type Laser, and the MCL type Laser may include a plurality of light emitting chips packaged in the same package and arranged in an array, and each light emitting chip may independently emit Laser light. The laser light directed to different beam splitters in the beam splitter 106 may be emitted by different light emitting regions in the laser, as described above, the first laser beam L1 and the second laser beam L2 may be emitted by light emitting chips in different light emitting regions in the laser 101, respectively. Alternatively, the laser light emitted to different beam splitters in the beam splitter 106 may also be from different lasers, and the embodiment of the present application is not limited thereto.

In the first light emitting mode of the laser, all the light emitting chips in the laser emit light simultaneously, so as to emit laser light to all the beam splitters in the beam splitter 106 simultaneously. In this case, the laser light emitted from the laser is high in brightness, and the brightness of the laser light is still high after the laser light is collected in the target direction by optical members such as a beam condensing member, a light combining lens, a condensing lens, and a fluorescent wheel. And the energy of the laser is higher, so that the first area on the fluorescent wheel can be excited to emit fluorescent light with higher brightness. Therefore, the brightness of the projection picture formed by mixing the laser and the fluorescence is higher, so that the higher brightness of the formed projection picture can be ensured, and the better projection effect of the projection equipment is ensured.

In the second light emission mode of the laser, the light emitting chip in the laser can emit light in a time-division manner. For example, the first part of chips and the second part of chips in the laser emit light alternately; the light emitting time of the first and second chips can be determined according to the switching timing of the first and second regions in the fluorescent wheel. For example, the laser light emitted from the first portion of the chip is directed to the first area, and the laser light emitted from the second portion of the chip is directed to the second area. Alternatively, the laser 101 may emit laser light to different beamsplitters at different times. For example, the first laser beam L1 emitted by the laser in fig. 2 may be laser emitted by the first partial chip, and the second laser beam L2 may be laser emitted by the second partial chip. In this case, since the light emitting chip in the laser does not need to continuously emit light, the light emitting chip can be powered by pulse current, and the energy of the pulse current is high, so that the laser light emitting chip can emit laser light with high brightness. And the light-emitting chip in the laser does not need to continuously emit light, so that the service life of the light-emitting chip in the laser can be prolonged. Optionally, the light emitting time of each light emitting chip in the laser may also be unrelated to the switching timing of the first region and the second region in the fluorescent wheel, and the embodiment of the present application is not limited. Alternatively, the first portion of chips may be subdivided into several portions of chips, and the laser emitted by each portion of chips is used to irradiate a sub-region in the first region. Optionally, the number of the first partial chip and the second partial chip may be the same or may also be different, and the embodiments of the present application are not limited.

Fig. 6 is a schematic structural diagram of a projection light source according to another embodiment of the present disclosure. As shown in fig. 6, in addition to any of the above projection light sources, the projection light source 10 may further include a light-receiving lens 108 and a light-uniformizing member 109, and fig. 6 is illustrated based on the projection light source shown in fig. 5. The light splitting device 106, the light combining lens 103, the light collecting lens 108 and the light uniformizing part 109 may be arranged in sequence along the target direction. The light combining lens 103 may reflect the light emitted from the converging lens 104 toward the light receiving lens 108 along a target direction, the light receiving lens 108 may converge the incident light to the light homogenizing member 109, and the light homogenizing member 109 may homogenize the incident light and emit the homogenized light to a subsequent member to form a projection image. For example, the light uniformizing part 109 may be a light pipe or a fly eye lens, and fig. 6 illustrates the light uniformizing part 109 as a light pipe.

In addition, each laser beam emitted by the laser is contracted through the corresponding beam contracting component, the beam contracting effect of each laser beam can be improved, the size of the transmission area on the light combining lens can be smaller, less laser beams which are emitted from the transmission area and cannot be utilized are emitted, and the utilization rate of the laser beams is ensured. The light diffusion part is arranged on the second area of the fluorescent wheel, and the laser can be diffused by the light diffusion part and then emitted to the light combining lens when being emitted to the second area of the fluorescent wheel, so that the light emitting angle range of the laser emitted from the fluorescent wheel is expanded. Because the light-emitting angle range of the fluorescence excited by the first area is larger, the light-emitting angle range difference between the laser and the fluorescence is smaller, the light mixing effect of the laser and the fluorescence is better, the light with the better light mixing effect is adopted to form a projection picture, and the display effect of the projection picture is also better.

Fig. 7 is a schematic structural diagram of a projection apparatus according to an embodiment of the present application. As shown in fig. 7, the projection apparatus may further include a light valve 110 and a lens 111 on the basis of fig. 6. The dodging part 109 of the projection light source 10 may emit light to the light valve 110, the light valve 110 may modulate the incident light and emit the modulated light to the lens 111, and the lens 111 may project the incident light to form a projection screen.

For example, the light valve 110 may include a plurality of reflective sheets, each of which may be used to form a pixel in the projection image, and the light valve 110 may reflect the laser light to the lens 111 according to the image to be displayed, so as to modulate the light, where the reflective sheet corresponding to the pixel that needs to be displayed in a bright state. Lens 111 may include a plurality of lenses (not shown), and for the arrangement of the structures in the projection device shown in fig. 7, the lenses in lens 111 may be arranged in sequence in a direction perpendicular to the paper surface. The laser emitted from the light valve 110 may sequentially pass through a plurality of lenses in the lens 111 to be emitted to the screen, so as to realize the projection of the laser by the lens 111 and realize the display of the projection picture.

Optionally, with continuing reference to fig. 7, the projection apparatus may further include an illumination lens assembly 112 disposed between the light uniformizing element 109 and the light valve 110, and the laser light homogenized by the light uniformizing element 109 may be emitted to the light valve 110 through the illumination lens assembly 112. The illumination mirror assembly 112 may include a reflector F, a lens T, and a Total Internal Reflection (TIR) prism L. The laser light emitted from the light homogenizing part 109 may be emitted to the reflective sheet F, the reflective sheet F may reflect the emitted light to the convex lens T, the convex lens T may converge the emitted laser light to the tir prism L, and the tir prism L reflects the emitted laser light to the light valve 110.

In summary, in the projection light source of the projection apparatus provided in the embodiment of the present application, the light combining lens includes a transmission area and a reflection area, the fluorescent wheel includes a first area and a second area, and the laser light emitted by the laser device can be emitted to the fluorescent wheel through the transmission area of the light combining lens, and then the first area is excited to emit fluorescent light when being emitted to the first area of the fluorescent wheel, and the fluorescent light is reflected on the light combining lens along the target direction. When the laser light is emitted to the second area of the fluorescent wheel, the laser light is reflected by the second area to the light combining lens and then is reflected by the reflecting area of the light combining lens along the target direction. Therefore, a relay loop system is not arranged, the light combination of laser and fluorescence can be realized only through a light combination lens, and the volume of the projection light source is small.

In addition, the transmission areas in the light combining lens are respectively positioned at two sides of the reflection area, and the light energy of the light beam which is emitted to the light combining lens is higher in the middle part and lower in the edge part, so that even if the light which is emitted to the light combining lens is emitted from the transmission area, the energy of the emitted light is smaller, and the light loss of the projection light source is smaller. Each laser beam emitted by the laser is contracted through the corresponding beam contracting component, the beam contracting effect of each laser beam can be improved, the size of the transmission area on the light combining lens can be smaller, less laser beams which are emitted from the transmission area and cannot be utilized are emitted, and the utilization rate of the laser beams is ensured. The light diffusion part is arranged on the second area of the fluorescent wheel, and the laser can be diffused by the light diffusion part and then emitted to the light combining lens when being emitted to the second area of the fluorescent wheel, so that the light emitting angle range of the laser emitted from the fluorescent wheel is expanded. Because the light-emitting angle range of the fluorescence excited by the first area is larger, the light-emitting angle range difference between the laser and the fluorescence is smaller, the light mixing effect of the laser and the fluorescence is better, the light with the better light mixing effect is adopted to form a projection picture, and the display effect of the projection picture is also better.

The term "at least one of a and B" in the present application is only one kind of association relationship describing an associated object, and means that three kinds of relationships may exist, for example, at least one of a and B may mean: a exists alone, A and B exist simultaneously, and B exists alone. The term "A, B and at least one of C" means that there may be seven relationships that may mean: seven cases of A alone, B alone, C alone, A and B together, A and C together, C and B together, and A, B and C together exist. In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "at least one" means one or more, and the term "plurality" means two or more, unless expressly defined otherwise.

As used in this specification and the appended claims, certain terms are used to refer to particular components, and it will be appreciated by those skilled in the art that a manufacturer may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result.

The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A projection light source, comprising: the device comprises a laser, a light combining lens, a converging lens and a fluorescent wheel; the light combining lens comprises a reflection area and two transmission areas which are respectively positioned at two sides of the reflection area; the fluorescent wheel comprises a first area and a second area, and the second area is provided with a light diffusion part;

2. The projection light source of claim 1, wherein the two laser beams respectively emitted from the two transmission regions form spots on the converging lens, and the spots are symmetrical with respect to an optical axis of the converging lens.

3. The projection light source according to claim 1 or 2, wherein the projection light source further comprises two beam splitters, each of which is configured to receive a portion of the laser light emitted by the laser device and reflect the received portion of the laser light as a laser light toward one of the transmission regions, so as to split the laser light emitted by the laser device into two laser lights respectively emitted to the two transmission regions.

4. The projection light source of claim 1 or 2, wherein the area of the transmission region in the light combining lens is smaller than the area of the reflection region.

5. The projection light source of claim 4 wherein the area of each transmissive region in the light combining lens is less than or equal to 1/4 times the area of the reflective region.

6. The projection light source of claim 4, wherein the projection light source further comprises two beam-reducing components, and the two beam-reducing components correspond to the two transmissive regions one to one; the laser emitted by the laser is contracted by the beam contracting component and then emitted to the corresponding transmission area.

7. The projection light source of claim 1 or 2, wherein the light combining lens satisfies at least one of the following conditions:

an antireflection film is arranged on the surface of the light combining lens facing the laser;

the surface of the light combining lens facing the laser is provided with a light diffusion structure;

and the transmission region is used for transmitting laser and reflecting the fluorescence.

8. The projection light source according to claim 1 or 2, wherein the laser light diffused by the light diffusion portion is parallel light after passing through the condensing lens.

9. The projection light source of claim 1 or 2, wherein the laser comprises a plurality of light emitting chips;

all light emitting chips in the laser emit light simultaneously;

or the first partial chip and the second partial chip in the laser alternately emit light; the laser emitted by the first part of chips is used for emitting to the first area, and the laser emitted by the second part of chips is used for emitting to the second area.

10. A projection device, characterized in that the projection device comprises: the projection light source of any one of claims 1 to 9, and a light valve and lens;