CN115032856A

CN115032856A - Light source assembly and projection equipment

Info

Publication number: CN115032856A
Application number: CN202210436739.1A
Authority: CN
Inventors: 李巍; 顾晓强; 唐甜甜
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2021-03-05
Filing date: 2021-03-05
Publication date: 2022-09-09
Anticipated expiration: 2041-03-05
Also published as: CN113031381A; CN113031381B; CN115032856B

Abstract

The application discloses light source subassembly and projection equipment belongs to the photoelectric technology field. The light source assembly comprises light-emitting assemblies, a light combining structure, a collimating lens group and a fluorescent wheel which are arranged along a first direction; the light emitting surface of the fluorescent wheel is a plane and comprises a first area and a second area; the laser penetrates through the collimating lens group from one side of an optical axis in the collimating lens group to emit to the fluorescent wheel; the fluorescent wheel is configured to rotate around a rotating shaft, and an included angle formed by the axial direction of the rotating shaft and the optical axis of the collimating lens group is an acute angle. The method is used for improving the uniformity of the color of the light spot formed after the fluorescence and the blue laser are mixed.

Description

Light source assembly and projection equipment

The application is based on Chinese invention application 202110243214.1 (2021-03-05), and the invention name is: divisional applications of light source assemblies and projection apparatuses.

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

In the projection apparatus, light emitted from the light source assembly may be collected by the light collecting member for image projection.

As shown in fig. 1, a light source assembly in the related art includes: laser 001, dichroic mirror 002, fluorescent wheel 003, converging lens 004, collimating mirror group 005, light-absorbing part 006 and reflector 007. Laser 001, mirror 007, dichroic mirror 002, collimator set 005, and fluorescent wheel 003 are arranged in sequence along a first direction (e.g., the y direction in the figure), and mirror 007 covers a first region in dichroic mirror 002, and mirror 007, dichroic mirror 002, converging lens 004, and light-absorbing member 006 are arranged in sequence along a second direction (e.g., the x direction in the figure) perpendicular to the first direction. Dichroic mirror 002 can transmit blue light and reflect red and green light. Fig. 2 is a top view of the luminescent wheel 003 of fig. 1, and as shown in fig. 2, the luminescent wheel 003 includes first regions 0031 and 0032 and a second region 0033, and the first region 0031 can emit red luminescent light under irradiation of blue laser light, and the first region 0032 can emit green luminescent light under irradiation of blue laser light. The laser 001 emits blue laser light in the first direction, and the blue laser light is emitted toward the fluorescent wheel 003 through a second region other than the first region in the dichroic mirror 002 and the collimator group 005. The luminescent wheel 003 is rotated in the w direction about its rotational axis Z to emit the blue laser light to different regions in the luminescent wheel 003 in time series, and further, the red luminescent light, the green luminescent light, and the blue laser light are emitted from the luminescent wheel 003 in time series. The blue laser passes through the first region of the collimating mirror set 005 and the dichroic mirror 002 and is emitted to the reflector 007, and is further reflected to the converging lens 004; the red and green fluorescent lights pass through the collimator set 005 to the dichroic mirror 002, and are reflected to the condenser lens 004. The light emitted to the condenser lens 004 is condensed to the light-receiving member 006 and projected on a screen.

Because the fluorescent light emitted by the first area can be transmitted to all directions, and the blue laser light is only transmitted to the reflection direction after being reflected by the second area in the fluorescent wheel, the position difference between the spot formed by the fluorescent light and the spot formed by the blue laser light is large. The uniformity of the color of the light spot formed after the fluorescence and the blue laser are mixed is poor, so that the uniformity of the color of the formed projection picture is poor, and the display effect of the projection picture is poor.

Disclosure of Invention

The application provides a light source component and projection equipment, which can solve the problem that the light receiving efficiency of laser emitted by the light source component is low. The technical scheme is as follows:

in one aspect, there is provided a light source assembly comprising: the device comprises a light emitting component, a light combining structure, a collimating lens group and a fluorescent wheel; the light combination structure at least comprises a reflection part, and the light emitting surface of the fluorescent wheel comprises a first area and a second area;

the light-emitting component emits laser, and the laser penetrates through the collimating lens group from one side of an optical axis in the collimating lens group to emit to the fluorescent wheel; the fluorescent wheel is configured to rotate around a rotating shaft, so that the laser light is emitted to different areas in the light emitting surface of the fluorescent wheel during the rotation of the fluorescent wheel; when the laser is emitted to the first area, the laser excites the first area to emit fluorescence, and the fluorescence passes through the collimating lens group and is emitted to the reflecting part; when the laser light is emitted to the second area, the laser light is emitted to the reflecting part after being reflected by the second area and passing through the collimating lens group, the second area is intersected with the optical axis of the collimating lens group and is not vertical to the optical axis of the collimating lens group, and the second area faces to one side of the optical axis in the collimating lens group; the reflecting part is used for turning the transmission direction of the incident light.

In another aspect, a projection apparatus is provided, the projection apparatus comprising: the light source assembly, the optical machine and the lens are arranged;

the light source assembly is used for emitting light to the light machine, the light machine is used for modulating the light emitted by the light source assembly and then emitting the light to the lens, and the lens is used for projecting the emitted light.

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

in the light source module that this application provided, the laser that light-emitting component sent passes the collimating mirror group directive fluorescence wheel from one side of optical axis in the collimating mirror group, and when this laser directive fluorescence wheel in the second district, this second district intersects and not perpendicular with the optical axis of collimating mirror group, and this one side of optical axis in this second district orientation collimating mirror group. Therefore, the reflection direction of the laser emitted by the light-emitting component after being emitted to the second area in the fluorescent wheel can be relatively close to the optical axis of the collimating lens group. Because the fluorescent light emitted from the first region in the fluorescent wheel in each direction is received by the collimating lens group and then emitted to the light combining structure, the fluorescent light is equivalently transmitted along the optical axis of the collimating lens group. Therefore, the transmission directions of the laser and the fluorescence which are emitted to the light combination structure are relatively close, the position difference of light spots formed by the laser and the fluorescence is relatively small, the color uniformity of the light spots formed after the laser and the fluorescence are combined is relatively good, the color uniformity of a formed projection picture is relatively good, and the display effect of the projection picture is improved.

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 diagram of a fluorescent wheel provided in the related art;

fig. 3 is a schematic structural diagram of a light source module provided in an embodiment of the present disclosure;

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 light source module according to another embodiment of the present disclosure;

FIG. 6 is a schematic view of another light source module provided in the embodiments of the present application;

FIG. 7 is a schematic view of a light source module according to another embodiment of the present disclosure;

FIG. 8 is a schematic view of another light source module according to another embodiment of the present disclosure;

FIG. 9 is a schematic view of another light source module according to another embodiment of the present disclosure;

FIG. 10 is a schematic view of another light source module according to another embodiment of the present disclosure;

FIG. 11 is a schematic view of a light source module according to still another embodiment of the present application;

FIG. 12 is a schematic view of another light source module according to still another embodiment of the present application;

FIG. 13 is a schematic view of a light source module according to still another embodiment of the present application;

FIG. 14 is a schematic view of a light source module according to still another embodiment of the present application;

FIG. 15 is a schematic view of a light source module according to another embodiment of the present disclosure;

FIG. 16 is a schematic view of another light source module according to another embodiment of the present application;

fig. 17 is a schematic view of a light source module according to still another embodiment of the present disclosure.

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.

With the development of the electro-optical technology, the requirement for the display effect of the projection picture of the projection device is higher and higher. In the correlation technique, the facula that the blue light that the light source subassembly sent formed and the facula position difference that ruddiness and green glow formed are great, and the coincidence degree of the facula that the light of different colours formed is lower, and the colour homogeneity that leads to the facula that the light source subassembly sent formed is lower, and then leads to the display effect of the projection picture that the light that sends according to the light source subassembly formed relatively poor. In addition, referring to fig. 1, the blue laser emitted from the laser 001 needs to pass through the dichroic mirror 002 and strike the collimating mirror group 005, and the collimating mirror group 005 converges the blue laser and strikes the fluorescent wheel 003 after the spot is reduced. The blue laser light is reflected when it is emitted to the second region in the fluorescence wheel 003, and is emitted to the reflecting mirror 007 through the collimator lens group 005 and the dichroic mirror 002 again, and the reflecting mirror 007 reflects the blue laser light so that the blue laser light is emitted to the condensing lens 004 after passing through the dichroic mirror 002 again, and is further condensed to the light-absorbing member 006 by the condensing lens 004. Therefore, the blue laser light passes through the dichroic mirror 002 three times. Since there is a partial loss of light each time the laser light passes through the dichroic mirror, e.g., the range of light transmittance of the dichroic mirror96% -97%, the maximum light efficiency of the blue laser which finally emits to the convergent lens after the blue laser in the related art transmits through the dichroic mirror for three times is 1-3% ³ About 0.91, the light loss of the blue laser is large.

The following embodiment of this application provides a light source subassembly, can improve the coincidence degree of the facula that the light of the different colours that the light source subassembly sent formed, and reduce the light loss of laser, improves the display effect of the projection picture of formation.

Fig. 3 is a schematic structural diagram of a light source module provided in an embodiment of the present disclosure. As shown in fig. 3, the light source assembly 10 may include: a light emitting component 101, a light combining structure 102, a fluorescent wheel 103 and a collimating lens group 105. The light combining structure 102 at least includes a reflection portion 1022, and the light emitting surface of the fluorescent wheel 103 includes a first region and a second region, the first region may also be referred to as a fluorescence excitation region, and the second region may also be referred to as a laser reflection region. In the embodiment of the present application, the light emitting surface of the fluorescent wheel refers to a surface of the fluorescent wheel for receiving and reflecting the laser light or emitting the excitation light. It should be noted that, in the embodiment of the present application, a top view of the fluorescence wheel 103 may refer to a top view of the fluorescence wheel shown in fig. 2, and for the description of the fluorescence wheel 103, reference may also be made to the description of the fluorescence wheel in fig. 2, and details of the embodiment of the present application are not repeated.

As shown in fig. 3, the light emitting assembly 101 may emit laser light, which is directed from one side of the optical axis of the collimator set 105 through the collimator set 105 toward the fluorescent wheel 103. For convenience of description, a side of the collimating lens group 105 on which the laser light emitted from the light emitting element 101 is incident is referred to as a target side, and the target side in fig. 3 is a right side of the optical axis. The fluorescent wheel 103 is configured to rotate around the rotation axis Z, such that during the rotation of the fluorescent wheel 103, the laser light is emitted to different areas in the light emitting surface of the fluorescent wheel 103, i.e. the laser light can be emitted to the first area and the second area in the fluorescent wheel 103 respectively at different times. When the laser light is emitted to the first region in the fluorescence wheel 103, the laser light excites the first region to emit fluorescence, and the fluorescence passes through the collimator group 105 and is emitted to the reflection part 1022; when the laser light is emitted to the second region in the fluorescent wheel 103, the laser light is reflected by the second region and then emitted to the reflection unit 1022 through the collimating lens group 105, the second region intersects with and is not perpendicular to the optical axis of the collimating lens group 105, and the second region faces to the target side of the collimating lens group 105. The reflection portion 1022 is used to turn the transmission direction of the incident light, for example, the reflection portion 1022 can reflect both the laser light and the fluorescence emitted from the collimating lens group 105 to the reflection portion 1022 along the target direction (e.g., x direction in fig. 4).

Alternatively, the fluorescent wheel may include a light-reflecting substrate, and a phosphor disposed on a partial region of the light-reflecting substrate. The surface of the light reflecting substrate facing the collimating lens group can be a light emergent surface of the fluorescent wheel, the area on the light reflecting substrate provided with the fluorescent powder is a first area of the fluorescent wheel, and the area without the fluorescent powder is a second area of the fluorescent wheel. Alternatively, the fluorescent wheel may include a substrate, and the phosphor and the reflective film are disposed on different regions of the substrate. The surface of the substrate facing the collimating lens group can be a light-emitting surface of the fluorescent wheel, the area on the substrate provided with the fluorescent powder is a first area of the fluorescent wheel, and the area provided with the reflective film is a second area of the fluorescent wheel. As shown in fig. 2, the top view of the light emitting surface of the fluorescent wheel may be annular. It should be noted that each first region of the fluorescent wheel may be provided with a color phosphor, each color phosphor may be excited to emit a color fluorescent light under irradiation of the laser light, and the fluorescent light may be emitted in various directions.

In the embodiment of the present application, when the first region on the fluorescent wheel 103 emits fluorescence under excitation of laser light, the region irradiated by the laser light in the first region emits light in all directions, and the side of the fluorescent wheel 103 away from the light emitting component 101 is opaque, so the light emitting angle of the region irradiated by the laser light in the first region may be 180 degrees. The fluorescence emitted from the region and incident on the collimating lens assembly 105 can be emitted to the reflecting portion 1022 of the light combining structure 102 by the collimating lens assembly 105, and then utilized for image projection. The fluorescence is emitted in the direction of the optical axis of the collimating lens group 105.

When the laser light is emitted to the second region in the fluorescent wheel 103, the second region is intersected with the optical axis of the collimating lens group 105 and is not perpendicular to the optical axis, and the second region faces the target side of the collimating lens group 105, that is, the second region is inclined and faces the side of the collimating lens group 105 from which the laser light is emitted. The angle between the second region and the optical axis of the collimating lens group 105 can be an acute angle. The second area facing the target side of the collimating lens group 105 is equivalent to rotating the normal line of the second area to the incident side of the laser, and further, compared with the fluorescent wheel in the related art, the incident angle of the laser in the second area in the embodiment of the present application is reduced, and accordingly the exit angle of the laser is also reduced; therefore, the exit direction of the laser in the second region is closer to the incident direction, and the exit direction can be closer to the optical axis of the collimating lens group 105. In the related art, when the laser is reflected by the second region on the fluorescent wheel 103, the incident light and the emergent light are respectively located at two sides of the optical axis of the collimator set 105, and the incident direction and the emergent direction are symmetrical with respect to the optical axis. Compared with the related art, in the embodiment of the present application, the exit direction of the laser light reflected by the second region may be closer to the optical axis of the collimating lens group 105, and may even exit along the optical axis. Therefore, the emitting direction of the laser is closer to the emitting direction of the fluorescence in the embodiment of the application, so that the difference between the irradiation position of the laser and the irradiation position of the fluorescence is smaller, the coincidence degree of the light spot formed by the laser and the light spot formed by the fluorescence is higher, the color uniformity of the light spot formed by mixing the laser and the fluorescence is higher, and the display effect of the projection picture formed by the light with higher color uniformity can be better.

It should be noted that, in this embodiment of the present application, the light emitting assembly 101 may emit a laser beam, and the emitting direction and the incident direction of the laser beam in this embodiment both refer to the emitting direction and the incident direction of the central light beam of the laser beam. The optical axis of the collimating lens group may be located inside the laser beam reflected at the second region of the fluorescent wheel. The color of the laser light emitted by the light emitting assembly 101 is different from the color of the fluorescent light emitted by the first region in the fluorescent wheel 103. The collimating lens group 105 can converge the incident laser light to reduce the spot of the laser light and emit the laser light to the fluorescent wheel 103.

To sum up, in the light source module provided in the embodiment of the present application, laser emitted by the light emitting module passes through the collimating lens group from one side of the optical axis in the collimating lens group to emit to the fluorescent wheel, and when the laser emits to the second region in the fluorescent wheel, the second region intersects with the optical axis of the collimating lens group and is not perpendicular to the optical axis, and the second region faces the one side of the optical axis in the collimating lens group. Therefore, the reflection direction of the laser emitted by the light-emitting component after being emitted to the second area in the fluorescent wheel can be relatively close to the optical axis of the collimating lens group. Because the fluorescent light emitted from the first region in the fluorescent wheel in each direction is received by the collimating lens group and then emitted to the light combining structure, the fluorescent light is equivalently transmitted along the optical axis of the collimating lens group. Therefore, the transmission directions of the laser and the fluorescence which are emitted to the light combination structure are relatively close, the position difference of light spots formed by the laser and the fluorescence is relatively small, the color uniformity of the light spots formed after the laser and the fluorescence are combined is relatively good, the color uniformity of a formed projection picture is relatively good, and the display effect of the projection picture is improved.

Referring to fig. 3, the light emitting element 101, the light combining structure 102, the collimating lens assembly 105 and the fluorescent wheel 103 may be sequentially arranged along a first direction (e.g., a y direction in fig. 3), where the first direction may be parallel to an optical axis of the collimating lens assembly 105. The light emitting element 101 is configured to emit laser light in a first direction, and the laser light is emitted to the collimator set 105 through a space outside the reflection portion 1022 in the light combining structure 102. The reflector 1022 may reflect light emitted from the collimating mirror group 105 toward the reflector 1022 in a target direction (e.g., x-direction in fig. 4). For convenience of description, the target direction will be referred to as a second direction, which may be perpendicular to the first direction, hereinafter.

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, in addition to fig. 3, the light source assembly 10 further includes a condensing lens 104 and a light-absorbing member 106. The light combining structure 102, the converging lens 104 and the light collecting part 106 are arranged in sequence along a second direction (such as the x direction in fig. 4), and the first direction is perpendicular to the second direction. The reflection unit 1022 in the light combining structure 102 is used for reflecting the incident light (such as the laser light and the fluorescent light) to the condensing lens 104, and the condensing lens 104 is used for condensing the incident light to the light-absorbing member 106. Alternatively, the light-absorbing part 106 may be a light pipe, or the light-absorbing part 106 may also be other parts, such as a fly-eye lens, and the embodiment of the present application is not limited thereto.

In the embodiment of the present application, there are many alternative implementations of the fluorescent wheel 103 to realize that the second region on the fluorescent wheel 103 is inclined and faces the target side of the collimator group 105, and three of the alternative implementations are described as examples below.

In a first alternative implementation, the light-emitting surface of the fluorescent wheel 103 is not planar, and the second region of the light-emitting surface of the fluorescent wheel 103 is convex relative to the first region. Alternatively, the first region may be planar. The plane of the first region is perpendicular to the axial direction of the rotation axis Z of the fluorescent wheel 103, and the axial direction of the rotation axis Z is parallel to the optical axis of the collimator group 105. Since the top view of the light emitting surface of the fluorescent wheel 103 is annular, the second area is a part of the light emitting surface, and the second area may be a curved surface, which may be a part of the circular table. The circular table surface in the embodiment of the application refers to a curved surface like the side surface of a circular table.

For example, with continuing reference to fig. 3 and fig. 4, a plane of a first region of the light-emitting surface of the fluorescent wheel 103 may be perpendicular to the optical axis of the collimating lens group 105, and a region of the orthogonal projection of a second region on the plane of the first region may be protruded with a reflective structure. The target cross section of the reflection structure may be triangular, the target cross section is parallel to the optical axis of the collimating lens group 105 and parallel to the radial direction of the fluorescent wheel 103, and the surface of the edge of the target cross section facing the target side of the collimating lens group 105 in the reflection structure is the second area in the light-emitting surface of the fluorescent wheel 103. Alternatively, as shown in fig. 3 and 4, the cross section of the reflecting structure may be a right triangle, and the second region may be a surface of the reflecting structure where a hypotenuse of the right triangle is located; or the section can also be an obtuse triangle, and the second area is the surface where the longest edge of the obtuse triangle in the reflecting structure is located; or the cross section may be an acute triangle, which is not limited in the embodiments of the present application.

In a second alternative implementation manner, fig. 5 is a schematic structural diagram of another light source module provided in the embodiments of the present application. As shown in fig. 5, the second region and the first region of the fluorescent wheel 103 are coplanar, and the light-emitting surface of the fluorescent wheel 103 is a plane. The plane of the light exit surface is perpendicular to the axial direction of the rotation axis Z of the fluorescent wheel 103, and the included angle formed by the axial direction and the optical axis of the collimating lens group 105 is an acute angle. Illustratively, the fluorescent wheel 103 may be a substantially annular plate-shaped structure, the fluorescent wheel 103 may be entirely inclined, and the surface of the fluorescent wheel 103 near the collimator lens group 105 faces the target side of the collimator lens group 105.

In a third alternative implementation, when the fluorescent wheel 103 rotates around the rotation axis Z thereof to irradiate the laser to the first area of the light-emitting surface, the first area may also be inclined and face the target side of the collimating lens group 105, for example, the light-emitting surface of the fluorescent wheel 103 may be a curved surface. Fig. 6 is a schematic structural diagram of another light source module provided in the embodiment of the present application. As shown in fig. 6, the light-emitting surface of the fluorescent wheel 106 is a circular table, the rotating shaft Z of the fluorescent wheel 103 is coaxial with the axis of the circular table, and the axial direction of the rotating shaft is parallel to the optical axis of the collimator group 105. It should be noted that, even if the first region in the fluorescence wheel 103 is also inclined, since the fluorescence emitted to the light combining structure 102 is determined by the light received by the collimating lens group 105, the fluorescence is still emitted to the light combining structure 102 along the optical axis of the collimating lens group 105, and the spot position difference between the laser and the fluorescence is still small. It should be noted that, in this optional implementation manner, reference may be made to the related description of the structure of the portion where the second region is located in the fluorescence wheel in the first optional implementation manner for the structure of the portion where the first region and the second region are located in the fluorescence wheel 103, and details of the embodiment of the present application are not described again. For example, as shown in fig. 6, the fluorescent wheel 103 may be configured like a circular truncated cone provided on an annular plate-shaped structure, and the light exit surface of the fluorescent wheel 103 is a side surface of the circular truncated cone.

It should be noted that fig. 3 to 6 are illustrated by taking the target side of the collimating lens group 105 as an example of the side of the collimating lens group 105 close to the converging lens 104. Alternatively, the target side may also be a side of the collimating lens group 105 away from the converging lens 104, that is, the laser light emitted by the light emitting element 101 enters the collimating lens group 105 from a side of the optical axis of the collimating lens group 105 away from the converging lens 104. Fig. 7 is a schematic structural diagram of a light source module according to another embodiment of the present disclosure, fig. 8 is a schematic structural diagram of another light source module according to another embodiment of the present disclosure, fig. 9 is a schematic structural diagram of another light source module according to another embodiment of the present disclosure, fig. 7 illustrates a manner that a second region in a light-emitting surface of a fluorescent wheel is convex with respect to a first region, fig. 7 illustrates a manner that the second region is coplanar with the first region in the light-emitting surface of the fluorescent wheel, and fig. 9 illustrates a manner that a light-emitting surface of the fluorescent wheel is a circular table. As shown in fig. 7 to 9, in this case, when the laser light is emitted to the second region in the light exit surface of the fluorescent wheel 103, the second region faces the target side of the collimator group 105 and is away from the condensing lens 104.

With continued reference to fig. 3-9, the rotation axis Z of the fluorescence wheel 103 can be located on the opposite side of the target side of the collimating lens group 105. Alternatively, fig. 10 to 15 are schematic structural diagrams of six other light source modules provided in the embodiments of the present application, and as shown in fig. 10 to 15, the rotation axis Z of the fluorescent wheel 103 may also be located at the target side of the collimating lens group 105. It should be noted that fig. 10 to fig. 15 are structures obtained by only changing the arrangement position of the rotating shaft of the fluorescent wheel 103 for fig. 4 to fig. 9, respectively, and for other related descriptions, please refer to fig. 4 to fig. 9, which is not repeated in the embodiments of the present application. For example, the fluorescent wheel 103 of fig. 12 and 15 may be configured similarly to a target ring-shaped structure provided on the ring-shaped plate-shaped structure, the target ring-shaped structure is a structure remaining after a circular truncated cone is cut in the middle of the cylinder, and the lower bottom surface of the cut circular truncated cone is the same as the bottom surface of the cylinder.

Optionally, in the embodiment of the present application, in the light exit surface of the fluorescent wheel 103, an included angle between a cross-sectional line of the second region cut by the target cross-section and the optical axis of the collimating lens group 105 ranges from 60 degrees to 75 degrees, the target cross-section is parallel to the optical axis of the collimating lens group 105 and the radial direction of the fluorescent wheel 102, and the included angle is also an included angle between the cross-sectional line and the first direction. For example, referring to fig. 3 to fig. 15, an included angle α between the intersection line and the optical axis of the collimating lens assembly 105 may range from 60 degrees to 75 degrees, that is, an included angle β between the intersection line and a plane perpendicular to the optical axis of the collimating lens assembly 105 ranges from 15 degrees to 30 degrees. The angle range can ensure that the emitting direction of the laser light reflected by the second region of the light emitting surface of the fluorescent wheel 103 is closer to the optical axis of the collimating lens group 105.

In the embodiment of the present application, the light combining structure 102 may only include the reflection portion 1022, or as shown in fig. 3 to fig. 15, the light combining structure 102 may further include a transmission portion 1021, and the transmission portion 1021 and the reflection portion 1022 are arranged in the second direction. The light emitting element 101 can emit laser light to the transmission part 1021 in the light combining structure 102, the laser light passes through the transmission part 1021 and is emitted to the collimating lens assembly 105, and the side where the transmission part 1021 is located is the target side of the collimating lens assembly 105. Therefore, when the laser beam is emitted to the second region of the light emitting surface of the fluorescent wheel 103, the second region can face the side of the transmission part 1021 in the light combining structure 102. Fig. 3 to fig. 6 are all illustrated by an example that the transmission part 1021 and the reflection part 1022 in the light combining structure 102 are sequentially arranged along the second direction, in this case, the second region in the fluorescent wheel 103 can face the transmission part 1021 and the converging lens 104 in the light combining structure 102 at the same time. Alternatively, as shown in fig. 7 to 9, the transmission part 1021 and the reflection part 1022 in the light combining structure 102 may also be arranged in sequence along the direction opposite to the second direction.

In the embodiment of the present application, the reflection part 1022 in the light combining structure 102 may be configured to reflect light of all wavelength bands, the transmission part 1021 may have dichroism, and the transmission part 1021 may be configured to transmit the laser light emitted from the light emitting element 101 and reflect the fluorescent light emitted from the first region of the fluorescent wheel 103. Illustratively, the laser light emitted by the light emitting assembly 101 may include blue laser light, and the fluorescent light emitted by the first region of the fluorescent wheel 103 may include at least one of red fluorescent light, green fluorescent light, and yellow fluorescent light. If the fluorescent light can comprise red fluorescent light and green fluorescent light, the fluorescent wheel can comprise two first areas, and one first area is provided with a red fluorescent material and is used for emitting the red fluorescent light under the irradiation of blue laser; the other first region is provided with a green fluorescent material for emitting green fluorescence under irradiation of blue laser light.

There are many alternative implementations of the light combining structure 102, and three of them are described as examples in the embodiments of the present application. In a first alternative implementation, the light combining structure 102 may be composed of two lenses that are spliced together. If the light combining structure 102 is formed by splicing a dichroic mirror as the transmission unit 1021 in the light combining structure 102 and a reflection mirror as the reflection unit 1022 in the light combining structure 102. In a second alternative implementation, the light combining structure 102 includes a transparent lens body, and dichroic and reflective films attached to different areas of the transparent lens body. The transmissive portion 1021 in the light combining structure 102 includes a dichroic film and a portion of the light transmissive lens body covered by the dichroic film, and the reflective portion 1022 in the light combining structure 102 includes a reflective film and a portion of the light transmissive lens body covered by the reflective film. In a third alternative implementation, the light combining structure 102 includes a dichroic mirror, and a reflective film attached to a partial region of the dichroic mirror. The transmission part 1021 in the light combining structure 102 includes a part not covered by the reflective film in the dichroic mirror, and the reflection part 1022 in the light combining structure 102 includes the reflective film and a part covered by the reflective film in the dichroic mirror. In the second and third alternative implementations, the light combining structure 102 can be a single lens.

Optionally, in the second optional implementation manner and the third optional implementation manner, the reflective film may be attached to one side of the light-transmitting lens body or the dichroic mirror, which is close to the fluorescent wheel 103, so that the laser light emitted by the light-emitting assembly 101, after passing through the transmission portion 1021 of the light combining structure 102 and being reflected by the second region in the light-emitting surface of the fluorescent wheel 103 and emitted out of the collimating lens group 105, may be directly reflected by the reflective film toward the converging lens 104 without passing through the light-transmitting lens body or the dichroic mirror again, thereby avoiding light loss caused by passing through the light-transmitting lens body or the dichroic mirror again. It should be noted that, in the light source module provided by the embodiment of the present application, the blue laser light emitted by the light emitting component can only pass through the dichroic mirror once, and the light loss caused by the dichroic mirror can only be 3% -4%, so that the light efficiency is improved compared with the light source module in the related art.

Alternatively, in the second alternative implementation, the dichroic film may be attached to the side of the transparent lens body near the fluorescent wheel 103. Optionally, the transmission part of the light combining structure 102 may also be plated with a film for increasing the transmittance of the blue laser. Optionally, in the embodiment of the present application, no lens may be disposed at the position of the transmission portion 1021 of the light combining structure 102, so as to allow the laser light emitted by the light emitting element 101 to directly enter the collimating lens group 105, which is not limited in the embodiment of the present application.

In the embodiment of the present application, on a plane perpendicular to the optical axis of the collimating lens assembly 105, an area of an orthogonal projection of the reflecting portion 1022 in the light combining structure 102 may be larger than an area of an orthogonal projection of the transmitting portion 1021. The area of the transmission part 1021 in the light combining structure 102 only needs to be enough for all the laser light emitted by the light emitting element 101 to transmit. For example, on a plane perpendicular to the optical axis of the collimating lens assembly 105, the orthographic projection of the transmission part 1021 in the light combining structure 102 can be overlapped with the orthographic projection of the light emitting surface of the light emitting element 101, and other areas in the light combining structure 102 can be set as the reflection parts 1022. In the embodiment of the present application, the laser light emitted from the transmission part 1021 of the light combining structure 102 can be emitted to the target side of the optical axis of the collimating lens group 105, and the laser light emitted from the light emitting component 101 after being reflected by the second region of the fluorescent wheel 103 can be emitted to the reflection part of the light combining structure 102 on the other side of the optical axis. Based on the principle of light reflection, there is a gap between the position of the light combining structure 102 where the laser beam is irradiated on the reflection part and the position where the laser beam is emitted from the transmission part, and the gap may belong to the reflection part 1022. Therefore, the deviation of the reflection angle can be avoided, the light loss generated by the reflection of the laser from the gap is caused, and the optical efficiency of the light source component can be improved.

In the embodiment of the present application, as shown in fig. 3 to 15, the light emitting assembly 101 may include only a laser. Alternatively, fig. 16 is a schematic structural diagram of another light source module provided in another embodiment of the present application. As shown in fig. 16, the light emitting assembly 101 may include a laser 1011 and a reflector 1012, the laser 1011 and the reflector 1012 may be sequentially arranged along the second direction, and the reflector 1012 is used for adjusting the transmission direction of the laser emitted by the laser 1011, so as to facilitate flexible arrangement of the structure of the light source assembly. On a plane (e.g., the light emitting surface of the laser 1011) perpendicular to the second direction, the orthographic projection of the mirror 1012 at least partially coincides with the light emitting surface of the laser 1011; on a plane perpendicular to the first direction, an orthogonal projection of the mirror 1012 at least partially overlaps an orthogonal projection of the transmission section 1021 of the light combining structure 102. Thus, it is ensured that the laser emitted from the light emitting surface of the laser 1011 is emitted to the reflector 1012, and is reflected on the reflector 1012 to the transmission part 1021 of the light combining structure 102, and further emitted from the transmission part 1021 of the light combining structure 102 to the collimating lens group 105.

Alternatively, fig. 17 is a schematic structural diagram of another light source module according to another embodiment of the present disclosure. As shown in fig. 17, on the basis of fig. 4, the light source assembly may further include: a beam shrinking mirror 107, wherein the beam shrinking mirror 107 may be located between the light emitting device 101 and the light combining structure 102. The laser emitted from the light emitting device 101 can be emitted to the beam shrinking mirror 107, and the beam shrinking mirror 107 can shrink the emitted laser to be emitted to the transmission portion 1021 of the light combining structure 102. Thus, the laser emitted from the light emitting assembly 101 can be condensed by the condensing lens assembly 107 to reduce the size of the light spot formed by the laser, so as to reduce the size of the light combining structure 102 and the optical elements in the subsequent light path, which is beneficial to the miniaturization of the light source assembly. For example, fig. 17 illustrates that the beam reducing lens group 107 includes one convex lens and one concave lens arranged in sequence along the first direction, and optionally, the beam reducing lens group may also include two convex lenses, for example, the beam reducing lens group may be a keplerian telescope.

Optionally, the light source assembly in the embodiment of the present application may further include a diffusion plate, and the diffusion plate may be disposed between the light emitting assembly and the light combining structure to improve a homogenization effect of the laser light emitted by the light emitting assembly. Optionally, in this embodiment of the application, the light diffusion structure may be disposed on a surface of the transmission portion of the light combination structure, which is close to the light emitting module, at this time, the light source module may not include a diffusion plate, and then the light source module may include fewer structures, which may ensure that the volume of the light source module is smaller.

It should be noted that, when the projection device in the related art performs projection display, a speckle effect is usually generated. 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 light and dark spots appear on the screen. The speckle effect makes the display effect of the projection image worse, and the spots which are not focused and have alternate light and shade are in a twinkling state when being seen by human eyes, so that the user is easy to feel dizzy when watching for a long time, and the watching experience of the user is worse. In this application embodiment, the laser that light emitting component sent can become comparatively even under the effect of diffuser plate or light diffusion structure, and then is used for the interference that projection produced with these lasers less strongly, can weaken the speckle effect when projection equipment carries out projection display, avoids the projection image to become colored, improves the display effect of projection image, avoids the people's eye to watch the dizzy sense that produces.

An embodiment of the present application further provides a projection device, where the projection device may include: the optical machine is positioned on the light emitting side of the light source component, and the lens is positioned on the light emitting side of the optical machine; the light source assembly is used for emitting light to the ray apparatus, and the ray apparatus is used for the light modulation back directive camera lens that sends the light source assembly, and the camera lens is used for throwing the light of incidenting into. The light source assembly may be any one of the light source assemblies described above. The light source assembly can 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 the display effect of the projection picture that this projection equipment throws can be better.

The term "at least one of a and B" in the present application is only one kind of association relation describing an associated object, and means that three kinds of relations 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 "plurality" means two or more unless expressly limited 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 of hardware 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 light source assembly, comprising: the light-emitting components, the light-combining structure, the collimating lens group and the fluorescent wheel are arranged along a first direction; the light combination structure at least comprises a reflection part, the light emitting surface of the fluorescent wheel is a plane and comprises a first area and a second area, and fluorescent powder is arranged in the first area; the second area is not provided with fluorescent powder and is used for reflecting light;

the first direction is parallel to the optical axis of the collimating lens group, and the light-emitting component is used for emitting laser along the first direction;

the laser penetrates through the collimating lens group from one side of an optical axis in the collimating lens group and is emitted to the fluorescent wheel; the fluorescent wheel is configured to rotate around a rotating shaft, so that the laser light is emitted to different areas in the light emitting surface of the fluorescent wheel during the rotation of the fluorescent wheel;

an included angle formed by the axial direction of the rotating shaft and the optical axis of the collimating lens group is an acute angle;

the reflecting part reflects light emitted from the collimating lens group to the reflecting part along a second direction, and the second direction is perpendicular to the first direction.

2. The light source assembly of claim 1, wherein the fluorescent wheel comprises a reflective substrate, the area on which the phosphor is disposed is a first region of the fluorescent wheel, and the area on which the phosphor is not disposed is a second region of the fluorescent wheel; or,

the fluorescent wheel comprises a substrate, wherein the area provided with fluorescent powder on the substrate is the first area of the fluorescent wheel, and the area provided with a reflective film is the second area of the fluorescent wheel.

3. The light source module as claimed in claim 1, wherein the light combining structure includes a transmission portion and a reflection portion, the laser light emitted from the light emitting module sequentially passes through the transmission portion and the collimator set to be emitted to the fluorescent wheel, and the transmission portion is configured to transmit the laser light and reflect the fluorescent light.

4. The light source assembly according to claim 3, wherein the reflective part and the transmissive part are arranged in the second direction or in a direction opposite to the second direction;

the first region and the second region are coplanar, and the second region faces to the side of the light combining structure where the transmission part is located.

5. The light source assembly according to claim 3, further comprising a converging lens and a light-receiving component,

when the reflection part and the transmission part are arranged along the second direction, the surface of the fluorescent wheel close to the collimating lens group faces the target side of the collimating lens group, and the target side of the collimating lens group is the side of the collimating lens group close to the converging lens.

6. The light source module according to any one of claims 1 to 5, wherein an included angle between a cross-sectional line of the second region, which is cut by a target cross-section parallel to the optical axis of the collimating lens group and a radial direction of the fluorescent wheel, and the optical axis is in a range of 60 degrees to 75 degrees; or the included angle beta between the intersection line and a plane perpendicular to the optical axis of the collimating lens group is 15-30 degrees.

7. The light source module according to claim 6, wherein an area of an orthographic projection of the reflecting part in the light combining structure is larger than an area of an orthographic projection of the transmitting part on a plane perpendicular to the optical axis.

8. The light source assembly of claim 3, wherein the light combining structure comprises a light transmissive lens body, and a dichroic film and a reflective film attached to different areas of the light transmissive lens body; the transmissive portion includes the dichroic film and a portion of the light transmissive lens body covered by the dichroic film, and the reflective portion includes the reflective film and a portion of the light transmissive lens body covered by the reflective film;

or the light combination structure comprises a dichroic mirror and a reflecting film attached to a partial area of the dichroic mirror; the transmissive portion includes a portion of the dichroic mirror not covered by the reflective film, and the reflective portion includes the reflective film and a portion of the dichroic mirror covered by the reflective film;

or, the light combination structure is formed by splicing a dichroic mirror and a reflecting mirror, the transmission part comprises the dichroic mirror, and the reflecting part comprises the reflecting mirror.

9. The light source module according to any one of claims 1 to 5, further comprising a beam shrinking mirror and a diffusion plate, the beam shrinking mirror and the diffusion plate being disposed between the light emitting assembly and the light combining structure.

10. A projection device, characterized in that the projection device comprises: the light source module of any one of claims 1 to 9, and an opto-mechanical and lens;