CN113900333B

CN113900333B - Light source assembly and projection equipment

Info

Publication number: CN113900333B
Application number: CN202010574764.7A
Authority: CN
Inventors: 李巍; 韩五月; 田有良
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2020-06-22
Filing date: 2020-06-22
Publication date: 2023-02-24
Anticipated expiration: 2040-06-22
Also published as: CN113900333A

Abstract

The application discloses light source subassembly and projection equipment belongs to the photoelectric technology field. The light source assembly includes: a light emitting element; a fluorescent wheel; the first lens group is arranged in a light path of the first beam of light and the second beam of light emitted by the light-emitting component and incident to the fluorescent wheel; the first beam of light and the second beam of light respectively transmit through different transmission areas of the light combining lens, are converged by the first lens group and then enter the fluorescent wheel; when the reflecting area of the fluorescence wheel receives the irradiation of the first beam of light and the second beam of light, the generated fluorescence is transmitted to different reflecting areas of the light combining lens through the first lens group and is reflected towards the light outlet direction, and when the reflecting area of the fluorescence wheel receives the irradiation of the first beam of light and the second beam of light, the first beam of light and the second beam of light are reflected by the reflecting area of the fluorescence wheel and are transmitted through the first lens group again, and then are transmitted to different reflecting areas of the light combining lens and are reflected towards the light outlet direction. The problem of the volume of light source subassembly is great has been solved in this application. The application is used for light emission.

Description

Light source assembly and projection equipment

Technical Field

The present application relates to the field of optoelectronic technologies, and in particular, to a light source module and a projection apparatus.

Background

With the development of the optoelectronic technology, the requirement for miniaturization of the light source component in the projection device is higher and higher.

In the related art, as shown in fig. 1, a light source assembly includes: laser 001, dichroic mirror 002, first collimating lens group 003, fluorescent wheel 004, light pipe 005, and a relay circuit system (not labeled in fig. 1) that may include 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 located on the light outgoing side of the laser 001, and are sequentially arranged along the light outgoing direction (e.g., x direction in fig. 1) of the laser 001, and the arrangement direction (e.g., y direction in fig. 1) of the light guide 005 and the dichroic mirror 002 is perpendicular to the light outgoing direction. This laser 001 is used for sending out blue laser, and this dichroic mirror 002 can be through blue light, so this blue laser can pass through dichroic mirror 002 and shoot to first collimating lens group 003, and then shoot to fluorescence wheel 004 through this first collimating lens group 003. The fluorescent wheel 004 includes a fluorescent region and a transmissive region, the fluorescent wheel 004 can rotate around a rotating shaft parallel to the light emitting direction, and blue laser can be emitted to different regions of the fluorescent wheel 004 when the fluorescent wheel 004 rotates. When blue laser light is emitted to the transmissive region of the fluorescent wheel 004, the blue laser light may pass through the transmissive region to be emitted to the relay circuit system, and the relay circuit system may transmit the blue laser light to the light guide 005. With the rotation of the fluorescent wheel 004, when the blue laser light is emitted to the fluorescent region of the fluorescent wheel 004, the fluorescent region can be excited to emit red light and green light, the red light and the green light can pass through the first collimating lens group 003 to be emitted to the dichroic mirror 002, the dichroic mirror 002 can also reflect the red light and the green light, and then the dichroic mirror 002 can reflect the red light and the green light to the light guide 005. The light guide 005 thus receives red and green light and blue laser light, which can be mixed for projection by the projection device.

However, as can be seen from the above schematic drawings, due to the arrangement of the blue light relay circuit, not only the number of lenses in the optical system is large, but also a certain space is required to be occupied, which results in a large volume of the light source module in the related art.

Disclosure of Invention

The application provides a light source assembly and projection equipment, which can solve the problem that the volume of the light source assembly is large. The technical scheme is as follows:

in one aspect, there is provided a light source assembly comprising: the light-emitting component is used for emitting first light beams and second light beams;

the fluorescent wheel is provided with a fluorescent area and a reflecting area, and the fluorescent wheel is not provided with a light-transmitting area;

a first lens group arranged in the light path of the first beam of light and the second beam of light incident on the fluorescent wheel;

the first beam of light and the second beam of light respectively transmit through different transmission areas of the light combining lens,

and the first beam and the second beam are converged by the first lens group and then enter the fluorescence wheel,

when the fluorescent area receives the irradiation of the first beam of light and the second beam of light, the fluorescent light generated by the excitation of the fluorescent area is reflected by the fluorescent wheel and is transmitted through the first lens group;

the light combining lens further comprises a plurality of reflection areas, the fluorescent light transmitted by the first lens group is respectively incident to different reflection areas of the light combining lens, the different reflection areas of the light combining lens reflect the fluorescent light towards the light outlet,

when the reflection area of the fluorescence wheel receives the irradiation of the first beam of light and the second beam of light, the first beam of light and the second beam of light are reflected by the reflection area of the fluorescence wheel, and are incident to different reflection areas of the light combining lens after being transmitted through the first lens group again, and the different reflection areas of the light combining lens reflect the first beam of light and the second beam of light towards the light outlet direction;

and the transmission areas or the reflection areas of the light combination lenses are arranged at intervals.

In another aspect, a projection apparatus is provided, the projection apparatus comprising: the light source assembly, the optical machine and the lens, wherein the optical machine is located at the light-emitting side of the laser, and the lens is located at the light-emitting side of the optical machine;

the light source assembly is used for emitting light to the ray machine, the ray machine is used for converging the light that the light source assembly sent to the camera lens, the camera lens is used for projecting the light after the ray machine converges.

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

in the light source subassembly that this application provided, close the light lens and include a plurality of transmission areas and reflecting area, the fluorescence wheel includes fluorescence area and reflecting area, and first bundle of light and the second that light emitting component sent are restrainted light as the exciting light, can see through and close the equal directive first mirror group of transmission area of difference in the light lens, and then through the first mirror group after gathering directive fluorescence wheel. When the two beams of light are emitted to the reflecting regions of the fluorescent wheel along with the rotation of the fluorescent wheel, the two beams of light are reflected by the reflecting regions of the fluorescent wheel, and are emitted to different reflecting regions of the light combining lens after passing through the first lens group again, and then are reflected to the direction of the light outlet of the light source component by the different reflecting regions. When the two beams of light irradiate the fluorescent area, the two beams of light excite the fluorescent area to generate fluorescence, the fluorescence is reflected by the fluorescent wheel and then is emitted to different reflecting areas of the light combining lens, and then the different reflecting areas reflect the fluorescence to the direction of the light outlet. Therefore, along with the rotation time sequence of the fluorescent wheel, the light source component can realize that two bundles of light emitted by the light-emitting component and the fluorescent light generated by the stimulated emission of the fluorescent area are all combined by the same light combining lens after being reflected by the fluorescent wheel, and are all reflected to the light outlet direction of the light source component by the light combining lens, so that the light source component has a compact light path structure, less optical lenses can realize the combination of the excitation light beams and the laser beams, and the volume of the light source component is smaller.

The laser projection equipment applying the light source component is relatively beneficial to realizing the miniaturization of the optical engine structure of the laser projection equipment through the miniaturization of the light source component, and can also bring convenience for other structures in the equipment, such as a heat dissipation structure or circuit board arrangement.

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 light source module provided in the related art;

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

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

FIG. 4 is a schematic view of another light source module according to the embodiments of the present disclosure;

FIG. 5 is a schematic view of a partial structure of a light source module according to an embodiment of the present disclosure;

FIG. 6 is a schematic view of a light source module according to another embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of another light source module provided in 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 light source assembly provided in the related art. As shown in fig. 1, the light source assembly includes: laser 001, dichroic mirror 002, first collimating lens group 003, fluorescence wheel 004, relay loop system, and light pipe 005. The dichroic mirror 002, the first collimating lens group 003, and the fluorescent wheel 004 are located on the light-emitting side of the laser 001, and are sequentially arranged along the light-emitting direction of the 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 light source module.

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 fluorescence (such as red fluorescence and green fluorescence) under irradiation of blue laser light and a transmissive region (not shown in fig. 1). The luminescent wheel 004 can rotate around a rotation axis parallel to the light emitting direction of the laser 001, and blue laser light 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 that the fluorescent light 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 light source module in the related art is bulky, and the following embodiments of the present application provide a light source module that is bulky.

Fig. 2 is a schematic structural diagram of a light source module according to an embodiment of the present disclosure. As shown in fig. 2, the light source assembly 10 may include:

a light emitting assembly 101 for emitting a first beam of light S1 and a second beam of light S2;

a fluorescent wheel 103 provided with a fluorescent region and a reflective region (the fluorescent region and the reflective region are not shown in fig. 2), and the fluorescent wheel 103 is not provided with a light-transmitting region;

a first lens group 105, disposed near the fluorescent wheel 103 and in the light path of the first beam S1 and the second beam S2 incident on the fluorescent wheel 103;

the light combining lens 102, the first light S1 and the second light S2 respectively transmit through different transmission regions (e.g. the first transmission region 1021a and the second transmission region 1021 b) of the light combining lens 102, and the first light S1 and the second light S2 are converged by the first lens assembly 105 and then incident on the fluorescent wheel 103. That is, the first light beam S1 and the second light beam S2 are emitted to the first lens group 105 through different transmission regions of the light combining lens 102, and further are converged by the first lens group 105 and then are emitted to the fluorescent wheel 103.

When the fluorescent region receives the irradiation of the first light beam S1 and the second light beam S2 as the fluorescent wheel 103 rotates, the fluorescent light generated by the excitation of the fluorescent region is reflected by the fluorescent wheel 103 and transmitted through the first mirror group 105; the light combining lens 102 further includes a plurality of reflective regions (e.g., a first reflective region 1022a and a second reflective region 1022 b), fluorescent light transmitted through the first lens group 105 is incident to different reflective regions of the light combining lens 102, and the different reflective regions of the light combining lens 102 reflect the fluorescent light toward the light exit. The first light and the second light are excitation light beams of fluorescence, and the fluorescence emitted by the fluorescence area can be called as an excited laser beam. In one embodiment, the direction of the light exit of the light source module 10 (e.g., the x direction in fig. 2) can be perpendicular to the arrangement direction (i.e., the y direction) of the light combining lens 102, the first lens group 105 and the fluorescent wheel 103. In one embodiment, as shown in fig. 1, the light source module 10 may further include a converging lens 104, and the converging lens 104 may be disposed at the light outlet of the light source module 10 to converge the light emitted toward the light outlet and then emit the light out of the light source module.

When the reflection area of the fluorescent wheel 103 receives the illumination of the first light beam S1 and the second light beam S2, the first light beam S1 and the second light beam S2 are reflected by the reflection area of the fluorescent wheel 103 and transmitted through the first lens group 105 again, and then are incident to different reflection areas of the light combining lens 102, and the different reflection areas of the light combining lens 102 reflect the first light beam S1 and the second light beam S2 toward the light outlet. As shown in fig. 2, the first light S1 is reflected by the reflective area of the fluorescent wheel 103 and transmitted through the first lens group 105 again, and then enters the first reflective area 1022a of the light combining lens 102; the second beam of light S2 is reflected by the reflective region of the fluorescent wheel 103 and then transmitted through the first mirror group 105 again, and then enters the second reflective region 1022b of the light combining lens 102.

Wherein, the transmission area or the reflection area of the light combining lens 102 are arranged at intervals. For example, the transmissive and reflective regions of the combiner lens 102 may alternate. As shown in fig. 2, the second reflective region 1022b is spaced between the first transmissive region 1012a and the second transmissive region 1012b, and the second transmissive region 1012b is spaced between the first reflective region 1022a and the second reflective region 1022b.

In the light source module provided in the embodiments of the present application, the light source module 10 may include a light emitting module 101, a light combining lens 102, a first lens group 105, and a fluorescent wheel 103. In one implementation, the light source module 10 may further include a converging lens 104. The light emitting assembly 101, the light combining lens 102 and the fluorescent wheel 103 may be sequentially arranged along a first direction (e.g., y direction shown in fig. 1), and the light combining lens 102 and the condensing lens 104 may be arranged along a second direction (e.g., x direction shown in fig. 1), where the first direction intersects the second direction. In the embodiment of the present application, the first direction is perpendicular to the second direction, and in a specific implementation, an included angle between the first direction and the second direction may also be an obtuse angle or an acute angle.

The first light beam S1 and the second light beam S2 emitted by the light emitting assembly 101 may be two independent light beams, or the first light beam S1 and the second light beam S2 may also be two light beams in one light beam, which is not limited in the embodiment of the present application. In a specific implementation, the light emitting assembly 101 may emit not only two light beams, but also three light beams, four light beams, or even more, and the number of the light beams emitted by the light emitting assembly is not limited in the embodiment of the present application. First beam of light and second beam of light can be for arbitrary two bundles of light in the many bundles of light that light emitting component sent, send the introduction to this first beam of light and second beam of light to the condition that light emitting component sent other numbers, this application embodiment is no longer repeated.

The transmissive region of the light combining lens 102 can transmit the light (e.g., the first light and the second light) emitted from the light emitting assembly 101, and the reflective region of the light combining lens 102 can reflect all of the incident light (e.g., the fluorescent light, the first light, or the second light) to the light outlet of the light source assembly 10 (e.g., where the converging lens 104 is located). In a specific implementation, the center of the light spot formed by the light reflected from the light combining lens 102 to the converging lens 104 may pass through the optical axis of the converging lens 104, or may not pass through the optical axis of the converging lens 104, which is not limited in the embodiment of the present application.

In one embodiment, as shown in fig. 2, the first lens group 105 may include at least one convex lens, and the convex arc surface of each convex lens faces the light combining lens 102. Fig. 2 illustrates that the first lens group 105 includes two convex lenses, for example, the first lens group 105 may also be a lens group formed by a piece of aspheric lens and a piece of plano-convex lens or a lens group formed by a concave-convex lens. In one embodiment, the first lens group 105 may also include one or three convex lenses. When the first lens group 105 includes a plurality of convex lenses, the convex lenses may be sequentially arranged along the arrangement direction of the light combining lens 102 and the fluorescent wheel 103, and the optical axes of the convex lenses are collinear. The first lens group 105 includes a plurality of convex lenses to ensure that the laser light incident into the first lens group is converged at the fluorescent wheel 103 more precisely.

In one embodiment, as shown in FIG. 2, the fluorescence wheel 103 can rotate about the rotation axis Z, such that the laser light (e.g., including the first beam and the second beam) transmitted from the combiner lens 102 to the fluorescence wheel 103 is switched between the fluorescence area and the reflection area. In one embodiment, the fluorescent wheel 103 may have a disc shape, the plane of the disc may intersect the first direction, and the rotation axis Z may pass through the center of the circular ring and be perpendicular to the plane of the disc. The fluorescent region of the fluorescent wheel 103 is used for emitting fluorescent light with a color different from that of the laser light under the excitation of the incident laser light; the reflecting region of the fluorescent wheel 103 is used for reflecting the incident laser light. In one embodiment, the fluorescent region can emit fluorescence in all directions under the excitation of the laser, for example, the light emitting angle of the fluorescent region can be 180 degrees, or other angles can also be used.

In this embodiment, after the first beam of light and the second beam of light pass through the light combining lens 102 and are emitted to the reflection area of the fluorescent wheel 103, the reflection area of the fluorescent wheel 103 can reflect the first beam of light and the second beam of light to different reflection areas in the light combining lens 102, and then different reflection areas in the light combining lens 102 can reflect the first beam of light and the second beam of light to the light outlet. After the first beam of light and the second beam of light pass through the light combining lens 102 and are emitted to the fluorescence area of the fluorescence wheel 103, the fluorescence area can emit fluorescence under the excitation of the first beam of light and the second beam of light, and the fluorescence is emitted to the reflection area in the light combining lens 102, so that the fluorescence can be reflected to the light outlet by the reflection area in the light combining lens 102.

It should be noted that fig. 2 illustrates the transmission process of the light only when the first light and the second light emitted from the light emitting assembly 101 respectively transmit through the first transmission area 1021a and the second transmission area 1021b of the light combining lens 102 and further emit to the reflection area of the fluorescent wheel 103. In this case, the light reflected by the reflective region of the fluorescent wheel 103 can be directed to only the reflective region of the combiner lens 102, such as the first light directed to the first reflective region 1022a and the second light directed to the second reflective region 1022b. In a specific implementation, for the case that the light emitted from the light emitting component 101 is directed to the fluorescent area of the fluorescent wheel 103, the fluorescent light emitted from the fluorescent area may be directed to both the reflective area and the transmissive area in the light combining lens 102, and the light transmission process in this case is not illustrated in this embodiment of the present application.

In the embodiment of the present application, the transmission area in the light combining lens 102 only needs to ensure that the laser light emitted by the light emitting component 101 can be transmitted and the fluorescence emitted by the fluorescence area of the fluorescence wheel can be reflected, and the reflection area in the light combining lens 102 only needs to ensure that the laser light emitted by the light emitting component 101 and the fluorescence emitted by the fluorescence area of the fluorescence wheel can be reflected; the embodiment of the present application is not limited to whether light with a color different from both laser light and fluorescent light can transmit through the transmission region or the reflection region in the light combining lens 102. In one implementation, the transmissive region of the light combining lens 102 can reflect light with a color different from both the laser light and the fluorescent light, and the reflective region of the light combining lens 102 can reflect light with all colors.

In one embodiment, the color of the laser light emitted by the light emitting assembly may be blue, that is, the first light beam and the second light beam are both blue laser light, and the color of the fluorescent light emitted by the fluorescent area in the fluorescent wheel under excitation of the blue laser light may include at least one of red, green and yellow. In a specific implementation, the color of the laser light emitted by the light emitting element and the color of the fluorescent light emitted by the fluorescent area may be other colors, which is not limited in the embodiments of the present application.

In the embodiment of the present application, the light emitting device 101 can emit laser light to the light combining lens 102, and the laser light can be emitted to the first lens group 105 through the transmission region in the light combining lens 102, and further emitted to the fluorescent wheel 103 through the first lens group 105. When the light source assembly 10 works, the fluorescent wheel 103 can rotate around the rotation axis Z thereof, and then the laser penetrating through the light combining lens can be switched between the fluorescent area and the reflective area of the fluorescent wheel 103. In the embodiment of the present application, an area irradiated by the laser light emitted from the light emitting assembly at the position of the fluorescent wheel is referred to as an irradiation area of the laser light. For example, as the fluorescent wheel 103 rotates, when the reflective area of the fluorescent wheel 103 is located at the irradiation area, i.e. the laser transmitted through the light combining lens 102 is emitted to the reflective area of the fluorescent wheel 103, the reflective area of the fluorescent wheel 103 can reflect the laser to the reflective area of the light combining lens 102. The reflection area of the light combining lens 102 reflects the laser light to the light outlet of the light source assembly 10. When the fluorescence area of the fluorescence wheel 103 is located in the irradiation area, that is, the laser light transmitted through the light combining lens 102 is emitted to the fluorescence area, the fluorescence area can emit fluorescence having a color different from that of the laser light to the light combining lens 102 under excitation of the laser light. The reflection region of the light combining lens 102 reflects the fluorescence to the light outlet of the light source assembly 10. Thus, the light outlet of the light source assembly 10 can converge laser light and fluorescent light with different colors.

In summary, in the light source module provided by the embodiment of the present application, the light combining lens includes a plurality of transmission regions and reflection regions, the fluorescence wheel includes a fluorescence region and a reflection region, and a first beam of light and a second beam of light emitted by the light emitting module serve as excitation light and can be transmitted through different transmission regions in the light combining lens to emit to the first lens group, and then emit to the fluorescence wheel after being converged by the first lens group. When the two beams of light irradiate the reflection area of the fluorescent wheel along with the rotation of the fluorescent wheel, the two beams of light are reflected by the reflection area of the fluorescent wheel, pass through the first lens group again and then are emitted to different reflection areas of the light combining lens, and then are reflected to the direction of the light outlet of the light source component by the different reflection areas. When the two beams of light irradiate the fluorescent area, the two beams of light excite the fluorescent area to generate fluorescence, the fluorescence is reflected by the fluorescent wheel and then is emitted to different reflecting areas of the light combining lens, and then the different reflecting areas reflect the fluorescence to the direction of the light outlet. Therefore, along with the rotation time sequence of the fluorescent wheel, the light source assembly can realize that two beams of light emitted by the light-emitting assembly and fluorescent light generated by the stimulated emission of the fluorescent area are combined by the same light combining lens after being reflected by the fluorescent wheel, and are reflected to the direction of the light outlet of the light source assembly by the light combining lens, so that the light source assembly has a compact light path structure, the combination of the excitation light beams and the received laser beams can be realized by fewer optical lenses, and the size of the light source assembly is smaller.

In addition, since the laser light is lost when passing through the dichroic mirror, and the laser light needs to pass through the dichroic mirror twice in the process of emitting the excitation light beam to the light outlet in the related art, the loss of the excitation light beam is high. In the embodiment of the application, the excitation light beam can be emitted to the light outlet through the light combining lens only once, so that the loss of the excitation light beam is reduced.

Based on the light source module structure of the above embodiments, the fluorescent wheel will be described with reference to the accompanying drawings:

in the technical scheme example of the application, the fluorescent wheel comprises a fluorescent area and a reflecting area, wherein the fluorescent area and the reflecting area can be enclosed to form a ring shape; the fluorescent area and the reflecting area can also be both in a fan shape and form a disc shape by enclosing. At least a green phosphor material, which may be a phosphor, may be disposed in the phosphor zone of the phosphor wheel 103. At least one of a red fluorescent material and a yellow fluorescent material may be disposed in the fluorescent region. The fluorescent material of each color can emit fluorescent light of a corresponding color under the excitation of the laser. In one embodiment, the fluorescence that is excited may also be a laser. In this way, the fluorescent area of the fluorescent wheel 103 can emit green fluorescent light, red fluorescent light or yellow fluorescent light under the action of the light emitted by the light emitting component.

For example, the fluorescent region in the fluorescent wheel 103 in the embodiment of the present application may include at least one sub-fluorescent region, and each sub-fluorescent region may include a fluorescent material of one color. When the fluorescent region includes a plurality of sub-fluorescent regions, the plurality of sub-fluorescent regions and the reflective region may be arranged in a circle. For example, fig. 3 is a schematic structural diagram of a fluorescent wheel provided in an embodiment of the present application, and the fluorescent wheel shown in fig. 3 may be a top view of the fluorescent wheel shown in fig. 2. As shown in fig. 3, the fluorescence wheel 103 may include a fluorescence zone 1031 and a reflection zone 1032, and the fluorescence zone 1031 may include two sub-fluorescence zones G1 and G2. The fluorescent wheel 103 can rotate in the w direction or the direction opposite to the w direction about the rotation axis Z. For example, the two sub-fluorescent regions may respectively include a green fluorescent material and a red fluorescent material, or the two sub-fluorescent regions may respectively include a green fluorescent material and a yellow fluorescent material, or the two sub-fluorescent regions may respectively include a green fluorescent material and an orange fluorescent material.

In the embodiments of the present application, the areas of the sub fluorescent regions are equal, and the area of the second reflective region is equal to the area of any one of the sub fluorescent regions. In one embodiment, the areas of the sub-phosphor regions and the reflective regions in the phosphor wheel may be different, and the areas of the sub-phosphor regions and the reflective regions of the phosphor wheel may be designed according to the color of the light emitted therefrom. Assuming that the laser emitted to the reflecting region of the fluorescent wheel is blue laser; the sub-fluorescent region G1 comprises a red fluorescent material and can emit red light under the excitation of blue laser; the sub fluorescent region G2 includes a green fluorescent material capable of emitting green light under excitation of blue laser light. The projection device needs to project white light, and then the light of various colors, which needs to be converged by the converging lens, can be mixed to obtain the white light. Illustratively, white light can be obtained by mixing blue light, red light and green light in a ratio of 1. In the embodiment of the present application, the rotation speed of the fluorescent wheel can be kept unchanged, and the areas of the sub-fluorescent regions and the reflection region of the fluorescent wheel are equal, so that the ratio of the blue light, the red light and the green light emitted by the fluorescent wheel is 1. As another example, if white light can be obtained after mixing blue light, red light, and green light in a ratio of 1. In one embodiment, the number of the sub-fluorescence regions can also be four, five or other numbers; the colors of the fluorescent light emitted from the respective sub fluorescent regions may all be different, or there may be at least two sub fluorescent regions emitting fluorescent light of the same color, and the at least two sub fluorescent regions may not be adjacent.

In the embodiments of the present application, the preparation of the fluorescence wheel can be achieved in various ways.

In an alternative, the fluorescent wheel 103 may have a reflective substrate, and the reflective region of the fluorescent wheel 103 may be a part of the reflective substrate, for example, the fluorescent wheel has a metal substrate, such as an aluminum substrate, and the surface of the aluminum substrate facing the light incidence has a mirror surface. The fluorescent region of the fluorescent wheel 103 may be located on a reflective substrate, the surface of which is a light-reflective surface. For example, the fluorescent material may be applied at a fixed location on the reflective substrate to form a fluorescent region of the fluorescent wheel, and the region of the reflective substrate that is not coated with the fluorescent material forms a reflective region of the fluorescent wheel. In one embodiment, the reflective substrate may be circular or ring-shaped, or may be in other shapes, such as rectangular or hexagonal, etc. When the reflecting substrate is in other shapes, the fluorescent region and the reflecting region can be surrounded into a ring shape by designing the coating region of the fluorescent material.

In another alternative, the substrate of the fluorescent wheel may not be a reflective substrate, e.g., the substrate is a ceramic substrate on which a reflective film layer may be disposed, e.g., the reflective region of the fluorescent wheel includes a reflective coating. For example, a ring structure with a poor light reflection effect may be coated with a fluorescent material and a reflective coating to obtain a fluorescent wheel. Wherein the areas coated with the fluorescent material form fluorescent regions of the fluorescent wheel and the areas coated with the reflective coating form reflective regions of the fluorescent wheel. As another example, a reflective coating can be applied to a region of a fluorescent structure made of a fluorescent material to provide a fluorescent wheel. The area of the fluorescent material coated with the reflective coating is a reflective area of the fluorescent wheel, and the area of the fluorescent material not coated with the reflective coating is a fluorescent area of the fluorescent wheel.

Based on the light source module structure of the above embodiments, the light combining lens 102 is described below with reference to the accompanying drawings:

in one embodiment, the light combining lens 102 may be disposed obliquely to the traveling direction of the first light beam and the second light beam emitted by the light emitting assembly, that is, the light combining lens 102 forms an included angle with the traveling direction. If the traveling direction of the first and second beams is the arrangement direction of the combining lens 102, the first lens group 105 and the fluorescent wheel 103 (i.e. the y direction in fig. 2), the combining lens 102 can be tilted with respect to the y direction. For example, the light combining lens 102 can be tilted toward the light outlet.

In one implementation, the number of the transmissive areas and the reflective areas in the light combining lens 102 may be greater than or equal to the number of the light beams emitted by the light emitting elements. For example, in the embodiment of the present application, the light emitting element 101 emits two beams of light, and the light combining lens 102 includes two transmissive regions and two reflective regions. In a specific implementation, the number of the transmission areas and the reflection areas in the light combining lens 102 may also be three, four or more, which is not limited in this embodiment of the present application. In one embodiment, the light combining lens may include other regions besides the transmissive regions and the reflective regions, and no light may be emitted to the other regions.

For example, as shown in fig. 2, the light combining lens 102 includes a first transmissive region 1021a, a second transmissive region 1021b, a first reflective region 1022a, and a second reflective region 1022b. The transmissive areas and the reflective areas in the light combining lens 102 may be alternately arranged along a second direction (e.g., x direction in fig. 2), for example, the first reflective area 1022a, the second transmissive area 1021b, the second reflective area 1022b, and the first transmissive area 1021a may be sequentially arranged along the second direction. The light combining lens 102 is tilted towards the light exit, for example, tilted at 45 degrees, so that the first transmission region 1021a can be disposed away from the first lens group 105, and the first reflection region 1022a can be disposed close to the first lens group 105. It should be noted that the light combining lens 102 is disposed in an inclined manner at 45 degrees, that is, an included angle between the light combining lens 102 and a traveling direction of the laser light emitted by the light emitting assembly is 45 degrees. The included angle may also be other angles, and the embodiment of the present application is not limited.

In this embodiment, each transmission area in the light combining lens 102 may correspond to a reflection area, and if light transmitted from a certain transmission area is reflected by the reflection area of the fluorescent wheel, the light may be reflected by the reflection area of the fluorescent wheel and then emitted to the reflection area corresponding to the transmission area in the light combining lens. If the light transmitted from a certain transmission area enters the fluorescence area of the fluorescence wheel, the excited fluorescence is reflected by the fluorescence wheel and then at least emits to the reflection area corresponding to the transmission area in the light combining lens. For example, with reference to fig. 2, a first transmission area 1021a of the light combining lens 102 corresponds to the first reflection area 1022a, and a second transmission area 1021b corresponds to the second reflection area 1022b.

In one embodiment, the area of the first transmissive region 1021a in the light combining lens 102 may be smaller than the area of the second transmissive region 1021b, and the area of the first reflective region 1022a may be smaller than the area of the second reflective region 1022b.

With reference to fig. 2, the distance between the first transmission region 1021a and the light emitting element 101 may be smaller than the distance between the second transmission region 1021b and the light emitting element 101, and the optical path of the laser (e.g., the first light beam S1) from the light emitting element 101 to the first transmission region 1021a is shorter than the optical path of the laser (e.g., the second light beam S2) from the light emitting element 101 to the second transmission region 1021 b; the distance between the first reflective region 1022a and the fluorescent wheel 103 is smaller than the distance between the second reflective region 1022b and the fluorescent wheel 103, and the optical path of the light (e.g., the first light S1 or the fluorescent light) from the fluorescent wheel 103 to the first reflective region 1022b is shorter than the optical path of the light (e.g., the second light S2 or the fluorescent light) from the fluorescent wheel 103 to the first reflective region 1022 a. Since the light spot formed by the shorter optical path of the light is smaller, the light spot on the first transmission area 1021a may be smaller than the light spot on the second transmission area 1021b, and the light spot on the first reflection area 1022a may be smaller than the light spot on the second reflection area 1022b. Furthermore, the first transmissive region 1021a only needs a small area to complete transmission of the incident laser, and the first reflective region 1022a only needs a small area to complete reflection of the incident light, so the area of the first transmissive region 1021a can be smaller than that of the second transmissive region 1021b, and the area of the first reflective region 1022a can be smaller than that of the second reflective region 1022b.

In the embodiment of the present application, the functions of the reflective area and the transmissive area in the light combining lens 102 can be realized in the following manner.

In an alternative mode, functional film layers can be arranged on different areas of the light-transmitting substrate to obtain the light-combining lens. For example, for the reflective area, the reflective area of the light combining lens 102 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 least one wave band of a red light wave band, a green light wave band and a blue light wave band. The coating film may be located on a side of the light combining lens 102 close to the first lens group 105, or on a side of the light combining lens 102 far from the first lens group 105, which is not limited in the embodiment of the present application. For the transmission area, the light combining lens 102 is disposed on the side close to the first lens group 105, and a dichroic film is disposed on at least the surface of the transmission area. The dichroic film may be configured to transmit blue light and reflect at least one of red, yellow, and green light. For example, the fluorescent light emitted from the fluorescent area of the fluorescent wheel to the light combining lens 102 includes red light, and even if the fluorescent light is emitted to the transmission area, the fluorescent light will be reflected by the dichroic film and further emitted to the light outlet of the light source module on the basis that the dichroic film is disposed on the surface of the transmission area of the light combining lens 102, so that the utilization rate of the fluorescent light is improved.

In another alternative, the reflective area of the light combining lens 102 can also be directly made of a reflective material. In one embodiment, the transmissive region of the light combining lens 102 can also be directly made of a dichroic material for transmitting blue light and reflecting at least one of red light, yellow light and green light. At this time, the plating film and the dichroic film may not be provided.

In one embodiment, an anti-reflection film is disposed on a side of the light combining lens 102 away from the first lens group 105; or, an antireflection film is disposed in the transmission region of the light combining lens 102 on the side far away from the first lens group 105. In an embodiment of the present invention, the transmittance of the anti-reflection film is increased for a full spectrum of light, or only for a laser (such as a blue laser) emitted by the light emitting device, and the embodiment of the present invention is not limited thereto.

Based on the light source module structure of the above embodiments, the following description is provided with reference to the accompanying drawings for light emitted by the light emitting module:

in one implementation, the wavelength bands of the first light and the second light emitted by the light-emitting assembly 101 can have an overlap. Illustratively, the first beam of light and the second beam of light may each be blue light. For example, the wave bands of the first light beam and the second light beam can be 400 nanometers to 450 nanometers; or the wave band of the first light beam can be 400-430 nm, and the wave band of the second light beam can be 420-450 nm; or the wavelength bands of the first light and the second light may also be other wavelength bands, and the embodiment of the present application is not limited.

In one implementation, the dominant wavelengths of the first and second beams of light are different. For example, the first and second beams of light may be blue light having different dominant wavelengths. It should be noted that a beam of light is obtained by combining light of a plurality of wavelengths in a wavelength band, and the beam of light is perceived by the human eye as a result of the combination of the wavelengths of light, and the human eye perceives the beam of light as corresponding to a single wavelength, which is the dominant wavelength of the beam of light.

The first beam of light and the second beam of light in this embodiment of the application may originate from the same light emitting component, or the first beam of light and the second beam of light may originate from different light emitting components, which is not limited in this embodiment of the application. The light emitting component 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 first light beam and the second light beam are emitted from different light emitting areas of the laser, for example, the first light beam and the second light beam can be emitted from different light emitting chips of the laser.

Referring to fig. 2, the light emitting surface of the laser 101 and the light receiving surface of the fluorescent wheel 103 may be parallel. The laser 101, the light combining lens 102, the first lens group 105 and the fluorescent wheel 103 are sequentially arranged along the light emitting direction of the laser 101, for example, the laser can directly emit laser to the transmission region of the light combining lens 102. In one implementation, the laser 101 may emit a laser beam that may be directed to each transmissive region of the combiner optic 102. Alternatively, the laser 101 may emit a plurality of laser beams such that each laser beam is directed to one transmissive area.

Fig. 4 is a schematic structural diagram of another light source module provided in the embodiments of the present application. As shown in fig. 4, the light emitting element may be an MCL type laser 101, and a light emitting surface of the laser 101 may be perpendicular to a light receiving surface of the fluorescent wheel 103. The light source module 10 may further include a plurality of reflective mirrors 108, the reflective mirrors 108 may be arranged along the light-emitting direction of the laser 101, and the reflective mirrors 108 are configured to reflect the light beam emitted from the laser 10 to form a plurality of light beams. The distances between the reflective mirrors 108 and the light-emitting surface of the laser 101 may be different. As shown in fig. 2, the plurality of mirrors 108 may include two mirrors for reflecting different portions of the beam emitted by the laser 101 to form the first beam S1 and the second beam S2.

For example, the distance between each mirror and the light emitting surface of the laser may include: the distance between any point of the surface of the reflection lens close to the laser and the light-emitting surface. The plurality of mirror plates may satisfy: in any two reflectors, at least part of orthographic projection of one reflector on the light-emitting surface of the laser is positioned outside orthographic projection of the other reflector on the light-emitting surface of the laser; the minimum separation of a point in the one mirror from the laser may be greater than the maximum separation of a point in the other mirror from the laser. Therefore, the distance between any point in the surface of each reflection mirror close to the laser and the laser is different from the distance between all points in the surfaces of the other reflection mirrors close to the laser and the laser.

In one implementation, each surface of the mirror may be a reflective surface, or only the surface of the mirror facing the laser 101 may be a reflective surface. In the embodiment of the present application, the number of the reflective mirrors may be an integer greater than or equal to 1, and fig. 4 illustrates that the light source assembly 10 includes two reflective mirrors, and in a specific implementation, the number of the reflective mirrors may also be one, three, four, or more. When the light source assembly only comprises one reflector, the reflector can be used for adjusting the transmission direction of the laser emitted by the laser. When the light source assembly comprises a plurality of reflection lenses, the plurality of reflection lenses can be used for splitting the laser emitted by the laser, and the distance between the laser beams obtained by splitting the laser can be adjusted by adjusting the positions of the reflection lenses.

For example, as shown in fig. 5, the laser 101 may emit only one laser beam, the one laser beam may be directed to two reflective mirrors 108, each of the reflective mirrors 108 may reflect a portion of the one laser beam directed to the reflective mirror 108, and the two reflective mirrors 108 may divide the one laser beam into a first beam S1 and a second beam S2. As shown in fig. 5, the larger the distance between the two reflectors 108 in the x direction (i.e., the light emitting direction of the laser 101) in the light source module is, the larger the distance between the two laser beams obtained by splitting the laser light emitted by the laser 101 is. Therefore, the distance between the laser beams emitted from the respective mirrors 108, that is, the distance between the laser beams emitted to the combiner 102 can be adjusted by adjusting the distance between the respective mirrors 108 in the light emitting direction of the laser 101.

In the embodiment of the present application, the number of the reflective lenses in the light source assembly may be the same as the number of the transmissive areas in the light combining lens, and each reflective lens in the light source assembly may correspond to each transmissive area in the light combining lens one to one. Each of the reflective mirrors may reflect the incident laser light to a corresponding transmissive region. For example, referring to fig. 4, in the two reflective mirror plates 108, the reflective mirror plate close to the laser corresponds to the first transmissive area 1021a of the light combining lens 102, and the reflective mirror plate reflects the incident laser light to the first transmissive area 1021a. The reflection lens far away from the laser corresponds to the second transmission region 1021b in the light combining lens 102, and the reflection lens can reflect the incident laser to the second transmission region 1021b. In the embodiment of the application, the positions of the corresponding reflection lenses can be designed according to the positions of the transmission areas in the light combining lens, so that the reflection of the incident laser to the corresponding transmission areas by each reflection lens is ensured.

In the first light emitting mode of the laser, the laser may emit laser light to all of the plurality of reflecting mirrors at the same time. For example, the laser may include a plurality of light emitting chips, and the plurality of light emitting chips may emit light simultaneously, thereby enabling the laser to emit laser light to a plurality of reflective mirrors simultaneously. In this case, the laser beam emitted from the laser is thick, the brightness of the laser beam is high, and the laser beam is high when it passes through the reflection mirror, the transmission region in the light combining mirror, the fluorescent wheel, and the reflection region in the light combining mirror and then is emitted to the condenser lens. Therefore, the converging lens can use the light with higher brightness for projection of the projection equipment, so that the brightness of the image obtained by projection of the projection equipment is higher, and the projection effect of the projection equipment is better.

In a second mode of the laser, the laser may emit laser light to different mirrors at different times. For example, the laser includes a plurality of light emitting chips, each of which corresponds to one of the mirror plates, and each of the light emitting chips is capable of emitting light toward the corresponding mirror plate. The light emitting chips emitting light in the laser at different time are different, so that the laser can emit laser to different reflecting lenses at different time. In this case, since only a part of the light emitting chips in the laser emit light at the same time, the beam of the emitted laser light is thin, and the beam of the laser light is thin when the laser light is emitted to the condensing lens after passing through the reflection mirror, the transmission region in the light combining mirror, the fluorescent wheel, and the reflection region in the light combining mirror. Therefore, the laser beams can be ensured to be easily and completely irradiated into the converging lens, the waste of the laser is avoided, and the simplicity of converging light by the converging lens is improved. In this case, the light emitting chip in the laser does not need to emit light continuously, so that the pulse current can be used for supplying power to the light emitting chip, and the energy of the pulse current is higher, so that the laser light emitting chip can emit laser with higher 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.

In one embodiment, the laser can emit laser light to different reflective mirrors according to the switching timing sequence of the fluorescent area and the reflective area in the fluorescent wheel, so that the laser light reflected by different reflective mirrors passes through the corresponding transmissive areas to emit to different areas (such as the fluorescent area and the reflective area) of the fluorescent wheel. In a specific implementation, the timing of the laser emitting light to each reflective mirror may also be independent of the switching timing of the fluorescent area and the reflective area in the fluorescent wheel, and the embodiment of the present application is not limited thereto.

For example, with continued reference to fig. 2 or 4, the first transmission area 1021a of the light combining lens 102 is close to the converging lens 104 relative to the second transmission area 1021b. The second transmissive region 1021b may be a transmissive region through which the laser light transmitted to the reflective region in the fluorescent wheel 103 is transmitted, and the first transmissive region 1021a may be a transmissive region through which the laser light transmitted to the fluorescent region in the fluorescent wheel 103 is transmitted. For example, as the fluorescent wheel 103 rotates, when the reflection area of the fluorescent wheel 103 is located at the irradiation area of the laser emitted from the light emitting assembly 101, the laser 101 may emit laser light to the reflective mirror closer to the laser; the laser light may be reflected on the reflective lens and then emitted to the reflective region of the fluorescent wheel 103 through the second transmissive region 1021b, and the reflective region of the fluorescent wheel 103 may reflect the laser light to the second reflective region 1022b. When the fluorescent region on the fluorescent wheel 103 is located at the irradiation region of the laser light emitted from the light emitting assembly 101, the laser 101 may emit the laser light toward the reflective mirror farther from the laser; the laser light can be reflected on the reflecting lens and then emitted to the fluorescent area through the first transmission area 1021 a; the fluorescent region may emit fluorescent light toward the first reflective region 1022a under excitation of the laser light. Since the optical path of the fluorescent light from the fluorescent wheel 103 to the first reflection region 1022a is short, the light spot formed by the fluorescent light on the first reflection region 1022a is small, the light beam of the fluorescent light is thin, and the first reflection region 1022a easily reflects all the fluorescent light to the converging lens 104, thereby improving the converging effect of the converging lens 104 on the fluorescent light.

The transmission of light from the light emitting assembly and the relationship between the first lens set and the light combining lens set will be described with reference to the accompanying drawings:

the laser beams transmitted through the transmission region of the light combining lens 102 can transmit through the region outside the optical axis h in the first lens group 105, and the first lens group 105 can converge the incident laser beams to the fluorescence wheel 103, for example, to the region of the fluorescence wheel 103 passing through the optical axis of the first lens group 105. It should be noted that there is no change in optical characteristics when light enters the first lens group along the optical axis of the first lens group, and if laser light passing through the transmission region in the light combining lens passes through the first lens group along the optical axis of the first lens group and is emitted to the fluorescence wheel, light emitted from the fluorescence wheel also passes through the first lens group along the optical axis of the first lens group and is then emitted to the transmission region, so that the laser light cannot reach the converging lens. Therefore, in the embodiment of the present application, the laser light emitted by the light emitting element needs to be transmitted to the region outside the optical axis in the first lens group through the transmissive region, and further transmitted to the fluorescent wheel.

In the embodiment of the present application, the first beam of light and the second beam of light may satisfy at least one of the following conditions:

the first beam of light and the second beam of light are incident to different mirror surface positions of the first mirror group;

the included angles formed by the connecting lines of the positions of the mirror surface of the first lens group, which is incident to the first light beam and the converging position of the second light beam on the fluorescent wheel, and the optical axis of the first lens group are different;

and the positions of the mirror surfaces of the first lens group and the second lens group are not symmetrical about the optical axis of the first lens group.

Therefore, the situation that when any one of the first light and the second light is converged to the reflection area of the fluorescent wheel, the first light and the second light are reflected to the transmission area into which the other light is incident by the reflection area can be avoided.

Illustratively, a connection line between a position to which the first light beam in the first lens group is directed and a convergence position of the first light beam on the fluorescent wheel is a first connection line, and an included angle between the first connection line and an optical axis of the first lens group is a first included angle; the connecting line of the position to which the second light beam in the first lens group irradiates and the convergence position of the second light beam on the fluorescent wheel is a second connecting line, and the included angle between the second connecting line and the optical axis of the second lens group is a second included angle; the first included angle is different from the second included angle. For example, referring to fig. 2 and fig. 4, a first angle formed by the first light beam S1 and the optical axis h of the first lens group 102 is an angle α, a second angle formed by the second light beam S2 and the optical axis h of the first lens group 102 is an angle β, and α > β. Thus, the first light and the second light can be incident on the mirror surface of the first lens group at different incident angles, for example, the convex surface of the first lens group, but according to the reflection principle, the respective reflection paths of the first light and the second light will not overlap. The first lens is a lens close to the light combining lens in the first lens group.

In one embodiment, for each transmissive region and corresponding reflective region in the light combining lens 102, the transmissive region and the reflective region are respectively located at two sides of the optical axis h of the first lens group 105; at least a partial orthographic projection of the transmissive region on the luminescent wheel 103 and at least a partial orthographic projection of the reflective region on the luminescent wheel 103 are symmetrical about the optical axis h. The orthographic projection of a certain component on the fluorescent wheel in the embodiment of the application can refer to the orthographic projection of the component on the disk surface of the fluorescent wheel. In one embodiment, when the light combining lens 102 includes a plurality of transmissive areas and a plurality of reflective areas, the transmissive areas may be located on two sides of the optical axis h and are not symmetrical with respect to the optical axis h, and the transmissive areas and the reflective areas in the light combining lens 102 may be alternately arranged.

Exemplarily, as shown in fig. 2 and 4, the second transmissive region 1021b and the corresponding second reflective region 1022b are located at two sides of the optical axis h of the first lens group 105, and the first transmissive region 1021a and the corresponding first reflective region 1022a are located at two sides of the optical axis h of the first lens group 105. The second transmission regions 1021b and the first transmission regions 1021a are also located at two sides of the optical axis h of the first lens group 105, and are not symmetric with respect to the optical axis h, so that the laser emitted to one transmission region is not emitted from the other transmission region. In one embodiment, a distance between the first transmission area 1021a and the optical axis h may be greater than a distance between the second transmission area 1021b and the optical axis h, so as to ensure that after the laser light passing through the first transmission area 1021a excites the fluorescence emitted by the fluorescence area, the first reflection area 1022a irradiated by the fluorescence is farther from the optical axis h than the second reflection area 1022b, thereby ensuring that an optical path from the fluorescence to the first reflection area 1022a is shorter, and a light spot formed by the fluorescence in the first reflection area 1022a is smaller.

Fig. 6 is a schematic structural diagram of another light source module according to an embodiment of the present disclosure. As shown in fig. 6, the light source assembly 10 may further include: the first beam of light and the second beam of light emitted by the light emitting element 101 also pass through the second lens group 106 before entering the light combining lens 102, and the second lens group 106 is used for reducing the light spots of the first beam of light and the second beam of light. The second lens group 106 can make the emitted laser beam thinner than the incident laser beam, so as to ensure that the laser can all enter the first lens group 105 through the transmission region of the light combining lens 102, thereby avoiding the waste of the laser.

In one embodiment, the second lens group 106 can be a telescopic lens group, and the second lens group 106 can include a convex lens 1061 and a concave lens 1062. In one embodiment, the optical axes of second lens group 106 and first lens group 105 may be collinear. Alternatively, the optical axis of second lens group 106 and the optical axis of first lens group 105 may not be collinear, for example, the distance between the first transmissive region and the optical axis of second lens group 106 may be equal to the distance between the second transmissive region and the optical axis of second lens group 106.

In one embodiment, the positions of the mirror surfaces of the first and second light beams incident on second lens group 106 are different. In one embodiment, the positions of the mirror surfaces of the first and second light beams incident on the second lens group 106 may not be symmetrical with respect to the optical axis of the second lens group 106.

With continued reference to fig. 6, the light source assembly 10 in the embodiment of the present application may further include: a third lens 107. The first light and the second light are transmitted through the second lens group 105 and pass through the third lens 107 before entering the light combining lens 102, and the third lens 107 may be a light homogenizing lens, such as a diffusion sheet. The third lens element 107 can be disposed between the second lens group 106 and the light combining lens element 102. The laser emitted by the laser device is contracted by the second lens group 106 and then emitted to the third lens 107, and the third lens 107 can uniformly process two different beams of laser and then emit to different transmission areas in the light combining lens 102.

In a specific implementation, the light source module of the present application may also be provided without the third lens, such that the light combining lens 103 has a light diffusion structure near the target surface (i.e. the light receiving surface) of the light emitting element 101. In one embodiment, the light diffusing structure may include a plurality of parallel stripe-shaped protrusions. Thus, the light source component can comprise fewer structures, and the volume of the light source component can be ensured to be smaller.

It should be noted that, in the related art, a speckle effect is usually generated when the projection device performs projection display. The speckle effect refers to an effect that after two laser beams emitted by a coherent light source are scattered when irradiating a rough object (such as a screen of a projection device), the two laser beams interfere in space, and finally granular spots with alternate light and dark appear on the screen. The speckle effect causes the display effect of the projected image to be poor, and the unfocused spots with alternate light and shade are in a flickering state when being seen by human eyes, so that the dazzling feeling is easy to generate after long-time viewing, and the viewing experience of a user is poor. In the embodiment of the application, the laser emitted by the light emitting component can be more uniform under the action of the light diffusion structure in the diffusion sheet or the light combination lens, so that the interference generated by the laser used for projection is weaker, the speckle effect when the projection equipment performs projection display can be weakened, the projection image is prevented from being deformed, the display effect of the projection image is improved, and the vertigo generated when the human eyes watch the projection image is avoided.

The transmission process of light in the light source module of the embodiments of the present application is described below.

As shown in fig. 6, as the fluorescent wheel 103 rotates, the laser 101 may emit laser light to the reflective mirror 108 near the laser when the reflective area of the fluorescent wheel 103 is located at the irradiation area of the laser light emitted from the light emitting assembly 101. The laser light may be reflected off the mirror to obtain a second beam of light, and the second beam of light is directed to second mirror group 106. The second lens group 106 may attenuate the second light beam and emit the second light beam to the third lens 107, and the third lens 107 may perform a homogenization treatment on the second light beam, so as to emit the second light beam to the second transmission area 1021b corresponding to the reflective lens. The second light beam can be transmitted to the first lens set 105 through the second transmission region 1021b, and the transmission direction of the second light beam is adjusted by the first lens set 105 to be transmitted to the fluorescent wheel 103. Since the reflection region of the fluorescent wheel 103 is located at the irradiation region of the laser light emitted from the light emitting unit 101, the second light can be emitted to the reflection region of the fluorescent wheel 103. The reflective region of the fluorescent wheel 103 can directly reflect the second beam of light to the second reflective region 1022b of the combiner lens 102, and the laser light can be reflected again on the second reflective region 1022b to enter the condenser lens 104.

As the fluorescent wheel 103 rotates, the laser 101 may emit laser light to the reflective mirror 108 away from the laser when the fluorescent area of the fluorescent wheel 103 is located at the irradiation area of the laser light emitted from the light emitting assembly 101. The laser beam can be reflected by the reflective mirror to obtain a first beam of light, and the first beam of light is transmitted to the second lens group 106. The second lens group 106 can attenuate the first light beam and emit the first light beam to the third lens 107, and the third lens 107 can homogenize the laser beam and emit the homogenized laser beam to the first transmission region 1021a corresponding to the reflective lens. The laser beam can be transmitted to the first lens set 105 through the first transmission region 1021a, and the first lens set 105 adjusts the transmission direction of the first beam to emit the first beam to the fluorescent wheel 103. Since the fluorescent region of the fluorescent wheel 103 is located at the irradiation region of the laser beam emitted from the light emitting element 101, the first beam of light can be emitted to the fluorescent region of the fluorescent wheel 103. The fluorescence area can emit fluorescence to the light combining lens 102 under the excitation of the first light, and the fluorescence can be reflected on the light combining lens 102 to enter the converging lens 104 after being emitted to the light combining lens 102.

It should be noted that, for the case that the laser in the light emitting assembly emits light to each reflection lens at the same time, reference may be made to the introduction that the light emitting assembly emits laser to different reflection lenses according to the switching timing sequence of the fluorescence area and the reflection area in the fluorescence wheel, and details of the embodiment of the present application are not repeated herein.

In summary, the light combining lens includes a plurality of transmission regions and reflection regions, the fluorescence wheel includes a fluorescence region and a reflection region, and the first beam and the second beam emitted by the light emitting assembly serve as excitation light and can be emitted to the first lens group through different transmission regions in the light combining lens, and then are emitted to the fluorescence wheel after being converged by the first lens group. When the two beams of light are emitted to the reflecting regions of the fluorescent wheel along with the rotation of the fluorescent wheel, the two beams of light are reflected by the reflecting regions of the fluorescent wheel, and are emitted to different reflecting regions of the light combining lens after passing through the first lens group again, and then are reflected to the direction of the light outlet of the light source component by the different reflecting regions. When the two beams of light irradiate the fluorescent area, the two beams of light excite the fluorescent area to generate fluorescence, the fluorescence is reflected by the fluorescent wheel and then is emitted to different reflecting areas of the light combining lens, and then the different reflecting areas reflect the fluorescence to the direction of the light outlet. Therefore, along with the rotation time sequence of the fluorescent wheel, the light source assembly can realize that two beams of light emitted by the light-emitting assembly and fluorescent light generated by the stimulated emission of the fluorescent area are combined by the same light combining lens after being reflected by the fluorescent wheel, and are reflected to the direction of the light outlet of the light source assembly by the light combining lens, so that the light source assembly has a compact light path structure, the combination of the excitation light beams and the received laser beams can be realized by fewer optical lenses, and the size of the light source assembly is smaller.

It should be noted that the above embodiments of the present application are only explained by taking the case that the light source assembly includes a light emitting assembly for emitting light of one color as an example. In one embodiment, the light source module may also include a plurality of light-emitting elements, each of which may emit light of one color.

Fig. 7 is a schematic structural diagram of another light source module provided in an embodiment of the present application. As shown in fig. 7, any one of the light source modules may further include another light-emitting component 109, and fig. 7 illustrates an example of adding another light-emitting component to the light source module of fig. 2. For example, the original light emitting device 101 in fig. 2 can be referred to as a first light emitting device, and the light emitting device added on the basis of fig. 2 can be referred to as a second light emitting device. The second light emitting assembly 109 may emit light of a different color from the first light emitting assembly 101, for example, the second light emitting assembly 109 may emit red laser light.

As shown in fig. 7, the light combining lens 102 and the converging lens 104 of the second light emitting assembly 109 are arranged along a second direction (x direction shown in fig. 7), which may be a light emitting direction of the second light emitting assembly 109. The second light-emitting assembly 109 can emit a third light beam S3, and the third light beam S3 can be transmitted through the combiner lens 102 toward the condenser lens 104 at the light-exit of the light source assembly. In this case, both the transmissive area and the reflective area of the light combining lens 102 need to be able to transmit the light emitted by the second light emitting assembly 109.

For the light source assembly shown in fig. 7, the third beam of light is directly emitted by the second light-emitting assembly without being excited by laser, so that the light-emitting limitation of the light source assembly can be reduced. In this way, the fluorescent area of the fluorescent wheel may not be provided with the fluorescent material having the same color as the third beam of light, and more fluorescent materials having different colors from the third beam of light may be provided to excite other colors of light, thereby ensuring higher excitation efficiency of the other colors of light. The fluorescent wheel may thus comprise only reflective areas and fluorescent areas provided with green fluorescent material.

In one embodiment, a diffusion sheet (not shown in fig. 7) may be further disposed between the second light emitting assembly 109 and the light combining lens 102 to ensure that the third light emitted to the light outlet of the light source assembly is uniform, so as to further reduce the speckle effect of the projection apparatus.

An embodiment of the present application further provides a projection device, where the projection device may include: the light source assembly, the optical machine and the lens, wherein the optical machine is positioned on the light-emitting side of the light source assembly, and the lens is positioned on the light-emitting side of the optical machine; the light source subassembly is used for sending light to the ray apparatus, and the ray apparatus is used for assembling the light that the light source subassembly sent to the camera lens, and the camera lens is used for throwing the light after assembling the ray apparatus. The light source assembly may be any one of the light source assemblies described above.

The projection equipment that this application embodiment provided is owing to use above-mentioned light source subassembly, so on the more miniaturized basis of light source subassembly, also do benefit to the miniaturization that realizes laser projection equipment optical engine structure to still can be for arranging of other structures in the projection equipment to bring convenience, for example this other structures can include heat radiation structure or circuit board.

The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship. 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 "at least one of a, B and C" means that there may be seven relationships that may represent: there are 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. 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 "plurality" means two or more unless explicitly defined otherwise.

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 light source assembly, comprising:

the light-emitting component is used for emitting first light beams and second light beams;

the light combining lens further comprises a plurality of reflection areas, the fluorescence transmitted by the first lens group is respectively incident to different reflection areas of the light combining lens, the different reflection areas of the light combining lens reflect the fluorescence towards the light outlet,

when the reflection area of the fluorescence wheel receives the irradiation of the first beam of light and the second beam of light, the first beam of light and the second beam of light are reflected by the reflection area of the fluorescence wheel and are incident to different reflection areas of the light combination lens after being transmitted through the first lens group again, and the different reflection areas of the light combination lens reflect the first beam of light and the second beam of light towards the light outlet;

the transmission areas or the reflection areas of the light combining lens are arranged at intervals, and the transmission areas are positioned on two sides of an optical axis in the first lens group and are not symmetrical relative to the optical axis;

the first beam of light and the second beam of light satisfy at least one of:

the included angles formed by the connecting lines of the positions of the mirror surface of the first lens group, which is incident to the first light beam, and the converging positions of the second light beam on the fluorescent wheel and the optical axis of the first lens group are different;

the position of a mirror surface of the first lens group, on which the first beam of light and the second beam of light are incident, is not symmetrical about an optical axis of the first lens group;

the light combining lens further comprises a first transmission area and a second transmission area, the first transmission area is located at one end of the light combining lens far away from the fluorescent wheel, the first reflection area is located at one end of the light combining lens close to the fluorescent wheel, and the second transmission area and the second reflection area are located between the first reflection area and the first transmission area; the first and second transmission regions transmit light emitted from the light emitting assembly and reflect fluorescence emitted from the fluorescence region of the fluorescence wheel.

2. The light source module as recited in claim 1, wherein the first transmissive region of the light combining lens is disposed away from the first mirror group, and the first reflective region is disposed proximate to the first mirror group.

3. The light source assembly according to claim 1, wherein an antireflection film is disposed on a side of the light combining lens away from the first lens group; or an antireflection film is arranged in a transmission area on one side of the light combining lens, which is far away from the first lens group;

and/or the light combination lens is close to one side of the first lens group, and a dichroic film is arranged on the surface of at least the transmission area and is used for transmitting blue light and reflecting at least one of red light, yellow light and green light.

4. The light source assembly of claim 1, wherein the reflection area of the light combining lens has a coating film, the coating film is a full-wavelength reflection film, or the coating film is a reflection film for at least one wavelength band selected from a red wavelength band, a green wavelength band, and a blue wavelength band.

5. The light source module as claimed in claim 1, wherein the first beam of light and the second beam of light pass through a second lens group before being incident on the light combining lens, and the second lens group is configured to narrow the spots of the first beam of light and the second beam of light.

6. The light source module as recited in claim 5, wherein the first light beam and the second light beam are transmitted through the second lens group and pass through a third lens before entering the light combining lens, and the third lens is a dodging lens.

7. The light source module according to claim 5, wherein the positions of the mirror surfaces of the first and second light beams incident on the second lens group are different, and/or the positions of the mirror surfaces of the first and second light beams incident on the second lens group are not symmetrical with respect to the optical axis of the second lens group.

8. The light source assembly of claim 1 or 5, wherein the first beam of light and the second beam of light originate from the same light-emitting assembly.

9. The light source assembly of claim 1 or 5, wherein the first beam of light and the second beam of light originate from different light-emitting assemblies.

10. The light source module of claim 8, wherein the light-emitting assembly is an MCL-type laser, and the first beam of light and the second beam of light are emitted from different light-emitting regions of the laser.

11. The light source module as claimed in claim 8, wherein the light emitting assembly is an MCL laser, and the light emitting surface of the laser is parallel to the light receiving surface of the fluorescent wheel.

12. The light source module as claimed in claim 8, wherein the light emitting module is an MCL-type laser, the light emitting surface of the laser is perpendicular to the light receiving surface of the fluorescent wheel, and two reflective mirrors are disposed along the light emitting direction of the laser, and the two reflective mirrors are respectively configured to reflect the light beam emitted from the laser to form the first light beam and the second light beam.

13. The light source module as recited in claim 12, wherein the two mirrors are at different distances from the exit surface of the laser.

14. A projection device, characterized in that the projection device comprises: the light source module of any one of claims 1 to 13, and an opto-mechanical and lens;

the light source assembly is used for emitting light to the ray machine, the ray machine is used for converging the light that the light source assembly emitted to the camera lens, the camera lens is used for projecting the light after the ray machine converges.