CN115702384A

CN115702384A - Light source assembly and projection equipment

Info

Publication number: CN115702384A
Application number: CN202180044686.2A
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: 2021-06-22
Publication date: 2023-02-14
Also published as: WO2021259282A1

Abstract

The application discloses a light source assembly and projection equipment, wherein the light source assembly comprises a first light-emitting assembly and a second light-emitting assembly, wherein the first light-emitting assembly emits a first laser beam and a second laser beam; the first laser beam and the second laser beam are incident to the fluorescent wheel, can excite the fluorescent area to generate first fluorescent light and second fluorescent light respectively, and the first fluorescent light and the second fluorescent light are reflected by the fluorescent wheel, then are incident to the first reflecting part and the second reflecting part respectively and are reflected to the direction of the light outlet; and the first laser beam and the second laser beam can be reflected by the reflecting area of the fluorescent wheel, are also incident to the first reflecting part and the second reflecting part and are reflected to the direction of the light outlet, and the third laser beam is directly emitted to the direction of the light outlet at least through the interval between the first reflecting part and the second reflecting part, so that the combined light output of the laser and the fluorescent light is realized.

Description

Light source assembly and projection equipment

Cross Reference to Related Applications

The priority of the present application claims to the chinese patent application entitled "light source assembly and projection apparatus" filed by the chinese patent office on 22/6/2020, and having application number 202010577389.1, and the chinese patent application entitled "light source assembly and projection apparatus" filed by the chinese patent office on 22/6/2020, and having application number 202010576382.8, which is entitled "light source assembly and projection apparatus", is incorporated herein by reference in its entirety.

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

The laser has the advantages of high brightness, good monochromaticity, long service life and the like, and is applied to the field of photoelectric technology, wherein the laser projection equipment adopts laser of at least one color as a projection light source, for example, a blue laser light source can be adopted as an excitation light source and a blue primary color light source, and a fluorescent wheel is adopted to generate other primary color light except blue light, or the blue laser light source and a red laser light source are adopted, and the fluorescent wheel is adopted to generate other primary color light except blue light and red light. Alternatively, blue, red and green laser sources are used, and the fluorescent wheel is no longer used to generate fluorescence.

And the above product schemes have advantages and disadvantages respectively. The laser projection equipment only adopting the blue laser light source has lower cost, but the color expression and the brightness are improved to meet the bottleneck because other primary color light is fluorescence.

The laser projection equipment adopting the blue laser light source and the red laser light source needs to increase the arrangement of red laser parts on the basis of the scheme that the original blue laser light source excites the fluorescent wheel, so that the volume of the bicolor laser light source is usually larger.

When a pure three-color laser is used as a projection light source, the color gamut and the brightness can reach better indexes, but the cost is higher, and the application of the pure color laser can bring about a more obvious speckle problem.

Disclosure of Invention

An embodiment of the present application provides a light source assembly on one hand, and the adopted technical scheme is as follows:

a light source assembly, comprising:

the first light-emitting component is used for emitting a first laser beam and a second laser beam;

the second light-emitting component is used for emitting a third laser beam, and the color of the third laser beam is different from that of the first laser beam and the second laser beam;

the fluorescent wheel is provided with a fluorescent area and a reflecting area;

the converging lens group is used for converging the first laser beam and the second laser beam to enter the fluorescence wheel;

the fluorescent area can be excited to respectively generate first fluorescence and second fluorescence when receiving the irradiation of the first laser beam and the second laser beam along with the rotation of the fluorescent wheel;

the first fluorescence and the second fluorescence are reflected by the fluorescence wheel, are transmitted through the converging lens group, are respectively incident to the first reflecting part and the second reflecting part, and are respectively reflected by the first reflecting part and the second reflecting part to the direction of the light outlet of the light source component;

the first reflecting part and the second reflecting part are parallel to each other and have intervals;

when the reflecting region of the fluorescent wheel receives the irradiation of the first laser beam and the second laser beam, the first laser beam and the second laser beam are reflected by the reflecting region of the fluorescent wheel, then are transmitted again through the converging mirror group, then are incident to the first reflecting part and the second reflecting part, and are reflected by the first reflecting part and the second reflecting part to the direction of the light outlet of the light source component;

the third laser beam is emitted to the light outlet direction of the light source component at least through the interval between the first reflecting part and the second reflecting part.

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

the light source assembly is used for emitting illuminating light beams to the light machine, the light machine is used for modulating the illuminating light beams emitted by the light source assembly and projecting the illuminating light beams to the lens, and the lens is used for projecting the light beams modulated by the light machine for imaging.

Drawings

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

Fig. 1-1 is a schematic view of an optical path of a light source module provided by an embodiment of the present application;

FIGS. 1-2 are schematic diagrams of the optical path of a laser beam incident on a fluorescence wheel according to embodiments of the present disclosure;

FIGS. 1-3 are schematic diagrams of optical paths for fluorescence excitation provided by embodiments of the present application;

fig. 2-1 is a schematic optical path diagram of a light source module provided in the embodiments of the present application;

2-2 are schematic diagrams of another optical path of a light source module provided by an embodiment of the present application;

FIG. 3-1 is a schematic wheel surface view of a fluorescent wheel provided in embodiments of the present application;

FIG. 3-2 is a schematic wheel surface view of a fluorescent wheel provided in accordance with an embodiment of the present disclosure;

FIG. 4-1 is a schematic view of the optical path of another light source module provided by the embodiments of the present application;

fig. 4-2 is a schematic optical path diagram of another light source module provided in the embodiments of the present application;

4-3 are schematic optical path diagrams of still another light source module provided in the embodiments of the present application;

5-1,5-2 are schematic diagrams of light paths of a light emitting assembly according to embodiments of the present disclosure;

FIG. 6 is a schematic optical path diagram of a projection apparatus provided in an embodiment of the present application;

FIG. 7 is a schematic structural diagram of a projection apparatus provided in an embodiment of the present application;

FIG. 8-1 and FIG. 8-2 are schematic structural views of a light emitting device according to an embodiment of the present invention;

FIG. 9 is a schematic view of an optical path of a light source module provided by an embodiment of the present application;

FIG. 10 is a schematic optical path diagram of a light source module provided in an embodiment of the present application;

FIG. 11 is a schematic view of another optical path of a light source module provided by an embodiment of the present application;

fig. 12 is a schematic view illustrating still another optical path of a light source module according to an embodiment of the present disclosure;

fig. 13 is a schematic plan view of a first light combining lens provided in the embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, the following detailed description of the embodiments of the present application will be made with reference to the accompanying drawings.

The light source subassembly that this application technical scheme relates is applied to among the laser projection equipment. In an example of the present application, a laser projection apparatus may include: the light source assembly is used as a light emitting source, the light machine is located on the light emitting side of the light source assembly, and the lens is located on the light emitting side of the light machine. The light source component is used for providing illumination light beams, can provide three primary colors of light in a time sequence (other colors of light can be added on the basis of the three primary colors of light), mixes light to form white light, and can also output the three primary colors of light simultaneously to continuously emit the white light.

The optical machine comprises a core light modulation component which is used for modulating the illumination light beams emitted by the light source component according to the image display signals to form light beams with image information and converging the light beams to the lens, and the lens is used for projecting and imaging the light beams modulated by the optical machine. The light source assembly comprises a laser capable of emitting laser with at least one color, such as blue laser. The light modulation component in the light machine can be a DMD digital micro-mirror array or an LCD liquid crystal light valve. The lens can be a long-focus lens or a short-focus lens.

In the present application example, the following example is described by taking an example in which the light source module outputs primary light in a time-sequential manner.

And, in this application example, the laser projection apparatus may be based on a DLP projection architecture, in which the light modulation component is a DMD chip, and the lens may be an ultra-short-focus lens, so that the laser projection apparatus in this example may be an ultra-short-focus laser projection apparatus, and projection of a large-size picture may be achieved with a small projection ratio.

In particular, various embodiments of the light source assembly will be described first.

Fig. 1-1 is a schematic diagram illustrating an optical path architecture of a light source module according to an embodiment of the present disclosure, and fig. 2-1 is a schematic diagram illustrating a fluorescence excitation optical path of the light source module according to fig. 1-1.

As shown in fig. 1-1, the light source assembly 10 may include:

the first light emitting assembly 1011 is configured to emit a first laser beam S1 and a second laser beam S2.

A second light emitting component 1012 for emitting a third laser beam S3, wherein the third laser beam has a color different from the first laser beam S1 and the second laser beam 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 the drawings and are shown in other drawings), and the fluorescent wheel 103 is not provided with a light-transmitting region;

the converging mirror group 105 is located on the front surface of the fluorescent wheel 103, is arranged in a light path where the first laser beam S1 and the second laser beam S2 enter the fluorescent wheel 103, and is configured to converge the excitation light beam to form a smaller excitation light spot, and specifically, is configured to converge the first laser beam S1 and the second laser beam S2 to enter the fluorescent wheel 103.

The first laser beam S1 and the second laser beam S2 are respectively incident to different positions of the mirror surface of the converging mirror assembly 105, and are both incident to the fluorescent wheel 103 after being converged by the converging mirror assembly 105.

As the fluorescent wheel 103 rotates, the fluorescent areas and the reflective areas are alternately illuminated by the laser beam.

When the fluorescent area receives the irradiation of the first laser beam S1 and the second laser beam S2, in this example, the first laser beam S1 and the second laser beam S2 may be emitted from the first light emitting assembly at the same time, and may also be regarded as being used to excite the fluorescent area at the same time.

As shown in fig. 1-2, when the first laser beam S1 and the second laser beam S2 are incident on the converging lens group 105, they do not pass through the optical axis h of the converging lens group 105, and are also not symmetrical with respect to the optical axis h. Further, the first laser beam S1 and the second laser beam S2 are distributed on two sides of the optical axis h of the converging mirror group 105 and are not symmetrical with respect to the optical axis h.

In one embodiment, a connection line between the position of the mirror surface of the first laser beam S1 and the position of the second laser beam S2 incident on the converging lens group 105 and the converging position of the respective laser beams on the fluorescent wheel 103 is different from an angle formed by the optical axis h of the converging lens group 105, for example, an angle is α and an angle is β, where α ≠ β. It should be noted that, when the included angle formed by the two laser beams is different, the two laser beams may be located on both sides of the optical axis h, or may be located on one side of the optical axis h. In this example, the example is given by distributing two laser beams on both sides of the optical axis h.

Alternatively, in a specific implementation, the distances from the positions where the first laser beam S1 and the second laser beam S2 are incident on the mirror surface of the converging mirror assembly 105 to the optical axis h of the converging mirror assembly 105 are different, for example, one distance is d1 and one distance is d2, where d1 ≠ d2, it should be noted that when the distances from the two laser beams to the optical axis h are different, the two laser beams may be located at two sides of the optical axis h, or may be located at one side of the optical axis h. In this example, the example is given by distributing two laser beams on both sides of the optical axis h.

Referring to fig. 2-1, the fluorescence area can be excited to generate a first fluorescence E1 and a second fluorescence E2 corresponding to the first laser S1 and the second laser S2, respectively, and both the first fluorescence E1 and the second fluorescence E2 can be reflected by the fluorescence wheel 103 and respectively incident on the first reflection portion 1022a and the second reflection portion 1022b after being transmitted through the converging mirror group 105.

And, with continued reference to fig. 1-1, fig. 2-1, wherein the first reflection portion 1022a and the second reflection portion 1022b are both disposed obliquely to the wheel surface of the fluorescent wheel 103, in an implementation, the first reflection portion 1022a and the second reflection portion 1022b are disposed along the same oblique angle, parallel to each other, and the first reflection portion 1022a and the second reflection portion 1022b do not overlap each other and have a gap therebetween. The gap is used for allowing the laser excitation light to pass through, and neither of the first reflection portion 1022a and the second reflection portion 1022b is located in the optical paths of the first laser beam S1 and the second laser beam S2, and does not block the two laser excitation lights.

Since the first fluorescence E1 and the second fluorescence E2 can be regarded as being excited and reflected by the fluorescence wheel 103 at the same time and being collimated by the converging mirror assembly 105, the first fluorescence E1 and the second fluorescence E2 are incident on the reflective surfaces of the first reflective portion 1022a and the second reflective portion 1022b, respectively, at the same time and are reflected by the two reflective members, in this example, both are reflected towards the light outlet of the light source module.

And, the third laser beam S3 emitted from the second light emitting element 1012 passes through at least the gap between the first and second reflecting

portions

1022a and 1022b and is directed toward the light exit of the light source element.

Therefore, when the first laser beam and the second laser beam emitted by the first light-emitting assembly emit to the reflection area of the fluorescent wheel along with the rotation of the fluorescent wheel, the two laser beams are reflected by the reflection area of the fluorescent wheel, and then are emitted to two different reflection parts after passing through the converging lens group again, and then are reflected to the light outlet direction of the light source assembly by the different reflection parts. When the two beams of light irradiate to the fluorescent area, the two beams of light excite the fluorescent area to generate fluorescence in different directions, the fluorescence is reflected by the fluorescent wheel and then is emitted to different reflecting parts, the different reflecting parts reflect the fluorescence to the direction of the light outlet, and the light beam of the second light-emitting component at least directly irradiates to the direction of the light outlet of the light source component through the interval between the two reflecting parts, so that the first beam of laser, the second beam of laser, the fluorescence and the third beam of laser all utilize the first reflecting part and the second reflecting part to complete light combination.

And, referring to fig. 3-1, a schematic illustration of a fluorescent wheel tread configuration is illustratively shown. As shown, the fluorescent wheel 103 includes a fluorescent region 1031 and a reflective region 1032, wherein the fluorescent region 1031 and the reflective region 1032 enclose to form a closed loop shape, such as a ring shape; the fluorescent region 1031 and the reflective region 1032 may also be both fan-shaped, so as to form a disk shape by enclosing. In this example, the fluorescent wheel does not include a light-transmissive region.

At least a green phosphor material, which may be a phosphor, may be disposed in the phosphor zone of the phosphor wheel 103. A yellow fluorescent material may also be disposed in the phosphor zone. The fluorescent material of each color can emit fluorescent light of a corresponding color under excitation of laser light. In one embodiment, the fluorescence obtained by excitation may also be one. As such, the fluorescent region of the fluorescent wheel 103 may emit green fluorescent light by the light emitted from the first light emitting assembly, or may also include yellow fluorescent light.

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. As shown in fig. 3-2, 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. The two sub fluorescent regions may include a green fluorescent material and a red fluorescent material, respectively, or the two sub fluorescent regions may include a green fluorescent material and a yellow fluorescent material, respectively, or the two sub fluorescent regions may include a green fluorescent material and an orange fluorescent material, respectively.

It should be noted that the area ratio of each of the fluorescent and reflective regions in fig. 3-1 or fig. 3-2 is merely an example. 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. The laser emitted to the reflecting area of the fluorescent wheel is assumed to be blue laser; the sub fluorescent region G1 comprises a yellow fluorescent material and can emit yellow 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.

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.

Referring to fig. 2-1, a schematic optical path diagram of fluorescence excitation is shown, it should be noted that, as the fluorescence wheel rotates, different fluorescent materials may sequentially and repeatedly generate fluorescence according to the rotation timing sequence by using the same optical path diagram as that in fig. 2-1, and the fluorescence of different colors may also be reflected, collimated, and finally reflected by the first and

second reflection portions

1022a and 1022b with reference to the path diagram in fig. 2-1. The excitation process of other fluorescence is not repeated herein, and reference is made to the foregoing description.

And, 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 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 fluorescent material and a reflective coating may be applied to a ring structure having a poor light reflection effect 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.

The schematic path of the laser beam in the light source module is described below in connection with fig. 2-2. As shown in fig. 2-2, the first laser beam S1 and the second laser beam S2 are both emitted from the first light emitting assembly 1011, and the first laser beam S1 and the second laser beam S2 are two separate non-overlapping beams, and in a specific implementation, there is a space between the first laser beam S1 and the second laser beam S2, so as to allow the first laser beam S1 and the second laser beam S2 to be incident on different positions of the optical lens in the optical path.

The first laser beam S1 and the second laser beam S2 emitted by the first light emitting assembly 1011 may be two independent beams, or the first laser beam S1 and the second laser beam S2 may also be two beams of light in one beam, which is not limited in the embodiment of the present application. In a specific implementation, the first light emitting assembly 1011 can 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 first light emitting assembly is not limited in the embodiment of the present application. In this application, the first beam of laser and the second beam of laser may be two arbitrary beams of light in the multiple beams of light emitted by the first light-emitting assembly, and for the case where the first light-emitting assembly emits other beams of light, reference may be made to the description of the first beam of laser and the second beam of laser, which is not repeated in this application.

As shown in fig. 2-2, the first laser light S1 and the second laser light S2 are incident on different positions of the mirror surface of the focusing lens group 105 on the front surface of the fluorescence wheel 103. The converging mirror group 105 converges both the two light beams to the front of the fluorescent wheel 103 to form a smaller excitation spot.

When the reflection region of the fluorescence wheel 103 receives the irradiation of the first laser beam S1 and the second laser beam S2, the first laser beam S1 and the second laser beam S2 may be reflected by the reflection region of the fluorescence wheel 103, and enter the first reflection portion 1022a and the second reflection portion 1022b after being transmitted through the focusing mirror assembly 105 again.

In one embodiment, the respective connecting lines between the position of the mirror surface of the first laser beam S1 and the second laser beam S1 incident on the focusing lens assembly 105 and the focusing position on the fluorescent wheel are different from the included angle formed by the optical axis h of the focusing lens assembly 105.

And the first laser beam S1 and the second laser beam S2 do not pass through the optical axis of the converging lens group 105, and the two laser beams are also not symmetrical with respect to the optical axis h of the converging lens group 105.

For example, a connecting line between a position to which a first laser beam is emitted in the converging lens group and a converging position of the first laser beam on the fluorescent wheel is a first connecting line, and an included angle between the first connecting line and an optical axis of the converging lens group is a first included angle; a connecting line between the position irradiated by the second beam of laser in the converging lens group and the converging position of the second beam of laser on the fluorescent wheel is a second connecting line, and an included angle between the second connecting line and the optical axis of the converging lens group is a second included angle; the first included angle is different from the second included angle. For example, referring to fig. 2-2, a first included angle formed by the first laser beam S1 and the optical axis h of the focusing lens group 102 is an angle α, a second included angle formed by the second laser beam S2 and the optical axis h of the focusing lens group 102 is an angle β, and α > β. Thus, the first laser beam and the second laser beam can be incident on the mirror surface of the converging mirror group at different incident angles, for example, the convex surface of the first lens of the converging mirror group, but according to the reflection principle, the respective reflection optical paths of the first laser beam and the second laser beam will not overlap, so that the first laser beam and the second laser beam reflected by the reflection area of the fluorescent wheel can be incident on the first reflection part 1022a and the second reflection part 1022b respectively along different reflection optical paths, and reflected by the two reflection parts, for example, emitted toward the light outlet direction of the light source assembly.

The first lens of the converging lens group is a lens which receives laser incidence in the converging lens group first.

And, in order to realize the excitation light path shown in fig. 2-1 and 2-2, one of the first laser beam and the second laser beam may be transmitted through the space between the first reflecting portion and the second reflecting portion, and the other may be transmitted through the side of the first reflecting portion or the second reflecting portion away from the space, for example, the side may be considered as being transmitted through the outside of one of the two reflecting portions. Thus, the first reflection part and the second reflection part do not block the laser excitation light beam by arranging the interval.

And, in the example shown in fig. 2-2, a beam reducing mirror group 106 is further included in the path of the first laser beam and the second laser beam entering the fluorescent wheel, and is located between the first light emitting assembly 1011 and the first and

second reflection parts

1022a and 1022b, and is used for reducing the spots of the first laser beam and the second laser beam emitted from the first light emitting assembly. The beam reduction lens group 106 can make the emitted laser beam thinner than the incident laser beam, so as to pass through the lens in the rear light path.

In one implementation, the beam reduction mirror group 106 can be a telescopic mirror group, and the beam reduction mirror group 106 can include a convex lens 1061 and a concave lens 1062. In one embodiment, the optical axis of the beam reducing mirror 106 and the optical axis of the converging mirror 105 may be collinear or coincident.

In one embodiment, the positions of the mirror surfaces of the first laser beam and the second laser beam incident on the beam reducing mirror 106 are different, and neither the first laser beam nor the second laser beam passes through the optical axis of the beam reducing mirror.

In one embodiment, the positions of the mirror surfaces of the first laser beam and the second laser beam incident on the beam reduction mirror 106 may not be symmetrical with respect to the optical axis of the beam reduction mirror 106.

It should be noted that, when the positions of the mirror surface of the converging mirror group 105 on which the first laser beam and the second laser beam are incident are different, the converging mirror group and the converging mirror group are coaxial, and thus, although the laser beam has the function of reducing the area of a light spot, when the first laser beam and the second laser beam before being reduced are incident on the converging mirror group 106, they are also incident on different positions of the mirror surface of the converging mirror group 106, and thus are also not symmetrical with respect to the optical axis of the converging mirror group 106.

And, on the basis of the above embodiments, fig. 4-1 shows a schematic light path diagram of another light source module provided in the present application.

The light source module of fig. 1-1, 2-1, and 2-2 is different from the light source modules of fig. 1-1, 2-1, and 2-2 in that the light emitting surface of the first light emitting element 1011 is perpendicular to the wheel surface of the fluorescent wheel 103 in fig. 4-1, rather than parallel to each other. The turning lens 108 is further disposed along the light-emitting surface direction of the first light-emitting assembly 1011 for reflecting the light beam emitted by the first light-emitting assembly to the wheel surface direction of the fluorescent wheel 103.

In an implementation, the first light emitting element 1011 may be an MCL-type laser 1011, and a light emitting surface of the laser 1011 may be perpendicular to a wheel surface or a light receiving surface of the fluorescent wheel 103.

The light source assembly 10 may further include a plurality of turning lenses 108, the turning lenses 108 may be arranged along the light emitting direction of the laser 1011, and the turning lenses 108 are configured to reflect the light beams emitted from the laser 10 to form a plurality of light beams. The distances between the turning lenses 108 and the light-emitting surface of the laser 1011 may all be different. As shown in fig. 4-2, the turning mirrors 108 may include two reflecting mirrors, which are respectively used to reflect different portions of the light beam emitted from the laser 1011 to form the first laser beam S1 and the second laser beam S2, and there is a gap between the first laser beam S1 and the second laser beam S2.

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

In one embodiment, each surface of the turning lens may be reflective, or only the surface of the turning lens facing the laser 1011 may be reflective. In the embodiment of the present application, the number of turning lenses may be an integer greater than or equal to 1, and fig. 4-1 illustrates that the light source assembly 10 includes two turning lenses, and in a specific implementation, the number of the turning lenses may also be one, three, four or more. When the light source assembly only comprises one turning lens, the turning lens can be used for adjusting the transmission direction of the laser emitted by the laser. When the light source assembly comprises a plurality of turning lenses, the turning lenses can be used for splitting the laser emitted by the laser, and the distance between the split laser beams can be adjusted by adjusting the positions of the turning lenses.

For example, as shown in fig. 5-1 and 5-2, the laser 1011 may emit at least two laser beams, the at least two laser beams may be directed to two turning mirrors 108, each turning mirror 108 may reflect a portion of the laser beam directed to the turning mirror 108, and the two turning mirrors 108 may divide the laser beam into a first laser beam S1 and a second laser beam S2.

The laser 1011 may also emit multiple laser beams, such as four or more laser beams, and the multiple laser beams may be respectively emitted to two turning mirrors 108, and each turning mirror 108 reflects and outputs a laser beam.

As shown in fig. 5-1 and 5-2, the larger the distance between two turning lenses 108 in the light source module in the x direction (i.e., the light emitting direction of the laser 1011), the larger the distance between the two laser beams obtained by splitting the laser beam emitted by the laser 1011. Therefore, the distance between the laser beams emitted from the turning lenses 108 can be adjusted by adjusting the distance between the turning lenses 108 in the light emitting direction of the laser 1011.

And, fig. 4-2 is an embodiment of a further light source module provided on the basis of the example of fig. 4-1.

In the schematic of the lamp assembly shown in fig. 4-2, the laser 1011 can emit two beams, which are deflected by the deflecting lens 108 to form two laser beams that are directed to the beam reduction mirror 106. The first laser beam and the second laser beam do not pass through the optical axis of the beam shrinking mirror group 6, and pass through the beam shrinking of the beam shrinking mirror group 106, and the first laser beam and the second laser beam both thin and avoid the first reflection part 1022a and the second reflection part 1022b, and emit to the converging mirror group 105. The optical axes of the converging mirror group 105 and the beam reducing mirror group coincide, the first laser beam and the second laser beam which pass through the beam reduction irradiate different positions on the mirror surface of the converging mirror group, and are incident to the same spot position of the fluorescence wheel after being converged to excite the fluorescence area of the fluorescence wheel 103 or be reflected by the reflection area of the fluorescence wheel 103.

The first laser beam, the second laser beam, or the first fluorescent light and the second fluorescent light reflected by the fluorescent wheel are sequentially emitted to the first reflector 1022a and the second reflector 1022b, and are reflected by the two reflectors toward the light exit of the light source unit to form a sequential illumination beam.

And, the light source assembly 10 in the embodiment of the present application may further include: a third lens 107. The first laser beam and the second laser beam are transmitted through the beam reduction lens group 105 and pass through a third lens 107 before being incident on the fluorescence wheel 103, and the third lens 107 may be a light homogenizing lens, such as a diffusion sheet. The third lens 107 can be located between the beam-shrinking mirror group 106 and the first and

second reflection portions

1022a and 1022b. The laser emitted by the laser device is condensed by the beam-condensing lens group 106 and then emitted to the third lens 107, the third lens 107 can homogenize two different beams of laser and then emit, and the excitation beam with homogenized energy density is beneficial to improving the conversion efficiency of fluorescence excitation.

In one implementation, the third optic may also be a fly-eye lens.

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 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 the embodiment of the application, the laser emitted by the first light-emitting component can be more uniform under the action of the diffusion sheet or the fly-eye lens, and then the interference generated by using the laser for projection is weaker, so that the speckle effect of projection equipment during projection display can be weakened, the projection image is prevented from being deformed, the display effect of the projection image is improved, and the dizzy feeling generated by watching by human eyes is avoided.

And, referring to fig. 4-3, the difference from fig. 4-2 is that a diffusion member 109 is further provided in the outgoing optical path of the second light emitting element 1012 before the third laser beam passes through the space between the first and

second reflection parts

1022a, 1022b. The diffusion member 109 may be specifically a diffusion sheet, and may be a diffusion sheet that is fixedly provided, or may be a diffusion sheet that moves, such as by vibration or rotation. After passing through the diffusion member 109, the red laser beam has an increased degree of homogenization, which is advantageous for reducing the speckle effect of the red laser beam.

And, in the light source module example shown in fig. 4-3, the third lens 107 may be specifically a fixedly disposed diffusion sheet, and may perform diffusion and homogenization after the first laser beam and the second laser beam are contracted, so as to excite the fluorescent material with a more uniform energy density distribution, thereby facilitating to improve the fluorescence conversion efficiency.

In the above examples, the third laser beam emitted from the second light emitting assembly 1012 may be directed to the light exit of the light source assembly 10 only through the gap between the first and

second reflectors

1022a and 1022b, or may be directed to the light exit of the light source assembly through the gap between the first and

second reflectors

1022a and 1022b, and through the side of the first or

second reflector

1022a or 1022b away from the gap. In this example, the first reflection part 1022a and the second reflection part 1022b may be both mirrors, such as formed by plating a reflection film on glass, and the two mirrors are arranged in parallel with a gap therebetween and do not overlap each other. And, when the light beam of the second light emitting assembly 1012 passes through both the interval between the first and

second reflection parts

1022a and 1022b and the side of the first or

second reflection part

1022a or 1022b away from the interval, the second light emitting assembly 1012 may emit two laser lights having a gap, specifically, for example, the second light emitting assembly 1012 may be an MCL type laser having four rows of light emitting chips, and the emission of the two laser lights having a gap may be realized by lighting at intervals. In the present embodiment, the third laser beam is not limited to only one laser beam, but may be two laser beams having a gap, and the third beam is to be distinguished from the first beam and the second beam.

In one embodiment, the first laser and the second laser may be the same color, such as blue laser, and the third laser may be red laser.

In the above-mentioned one and a plurality of embodiments of this application scheme, in this application technical scheme, the last laser reflection district that is provided with of fluorescence wheel, set up laser transmission district and then need set up relay loop system in the correlation technique and compare, the relay that uses in the light source subassembly in this application scheme changes optical component few, has saved the space of arranging, also makes the light path architecture compact, can also compromise the miniaturization of light source subassembly when realizing higher luminous power.

And the first laser beam and the second laser beam emitted by the first light-emitting component are both used as exciting light and emitted to different positions of the mirror surface of the converging lens group, are not symmetrical about the optical axis of the converging lens group, and can excite the fluorescence wheel to generate first fluorescence and second fluorescence in different emergent directions.

Since the laser beam is a high-energy beam, if it is desired to increase the luminous power of the fluorescence by increasing the energy density of the single laser beam, it will not only bring unreliability and higher heat-resistant requirements to the optical lens in the optical path, resulting in an increase in the cost of the optical path architecture, but also may bring heat dissipation to the fluorescence wheel due to the irradiation of the high-energy density beam, and on the contrary, decrease the fluorescence conversion efficiency.

In this application technical scheme, set up laser excitation light beam into two bundles, to setting up the lens in the excitation light path, two bundles of different light shines to the different positions of lens, can alleviate the lens part and receive the ageing or the performance degradation problem that high energy beam shines and bring for a long time.

And irradiating the two laser beams to different positions of the converging lens group, so that the incident directions of the two laser beams to the fluorescent wheel are different, when the two laser beams converge at the reflecting region of the fluorescent wheel, the two laser beams are reflected and then penetrate through the collimating lens group again and then are emitted according to the reflection law, and therefore the two laser beams are incident to different reflecting components and are reflected by different reflecting components.

And, in a similar way, irradiating the two laser beams to different positions of the converging lens group, so that the incident directions to the fluorescence wheel are different, when converging in the fluorescence area of the fluorescence wheel, the two laser beams excite the fluorescence area to generate two fluorescence beams, and the two fluorescence beams are reflected by the fluorescence wheel and then are emitted to different reflecting components through the converging lens group. The reflecting component can reflect the two laser beams and the fluorescent beam in the same direction in a time-sharing manner so as to complete light combination.

And for the second light-emitting component, a third laser beam can be emitted when the first light-emitting component is not lighted, and the third laser beam is emitted at least through the interval between the first reflecting part and the second reflecting part and directly emitted to the light outlet direction of the light source component, so that the third laser beam, the blue laser beam and the fluorescent beam can jointly form three primary colors or four primary colors of the light source to be output.

The third beam of laser emitted by the second light-emitting component is emitted to the light outlet direction of the light source component at least through the interval between the first reflecting part and the second reflecting part, so that the emitting directions of the third beam of laser and the first beam of laser, the second beam of laser and the fluorescence are consistent, and the combined light output of the bicolor laser and the fluorescence can be realized by using the first reflecting part and the second reflecting part. Because the used light combination parts are few, the light emitting assemblies emitting laser with different colors can be arranged close to each other due to the sharing of the parts, and the layout of optical parts in the light source assembly can be more compact.

In this application technical scheme, first reflection part, second reflection part are as to close light part, and wherein three directions are around being provided with first light-emitting component, second light-emitting component and fluorescent wheel, and remaining one direction is the light-emitting window of light source subassembly, and like this, the outgoing light beam of first light-emitting component, second light-emitting component, fluorescent wheel shares first reflection part and second reflection part as to close light part, closes light part few, and light source framework overall arrangement is compact.

Meanwhile, the first reflecting part and the second reflecting part are used as guide components for the first laser beam and the second laser beam emitted by the first light emitting assembly to enter the fluorescent wheel, and also used as light receiving components for the first laser beam and the second laser beam after being reflected by the fluorescent wheel, and are combined in the same direction, so that the first reflecting part and the second reflecting part are multiplexed in the fluorescent excitation process.

And the turning lens is arranged on the light-emitting surface of the first light-emitting component, and the distance between the first laser beam and the second laser beam is adjusted through the distance between the turning lens and the light-emitting surface, so that the position of the two laser beams incident on the mirror surface of the optical lens is changed, and the asymmetric arrangement of the two laser beams relative to the optical axis of the lens is realized.

Based on the asymmetric arrangement, the two excitation light paths cannot be overlapped, the utilization rate of the lens area is improved, the excitation power can be improved, and the requirement on the local tolerance of the optical lens cannot be increased.

As an improvement or modification of the foregoing embodiments, in a specific implementation, a light collecting component may be further disposed in the light outlet direction of the light source assembly 10, or a collecting lens and a light collecting component are sequentially disposed to complete the collection of the fluorescent light and the laser light beams sequentially reflected by the first reflecting portion and the second reflecting portion, and the collected fluorescent light and the laser light beams are used as the output of the light source assembly.

In one embodiment of the present application, the first reflecting portion and the second reflecting portion are two independently disposed mirrors, and the mirrors are full-band mirrors or mirrors reflecting specific multiple bands, such as specific yellow band, green band, and blue band.

In another specific implementation of the present application, the first reflective portion and the second reflective portion may be dichroic mirrors, which are capable of transmitting red light and reflecting light in other wavelength bands besides red light, and may reflect blue light, green light in a specific wavelength band more precisely, or may reflect yellow light in a specific wavelength band. In this example, the third laser beam emitted by the second light emitting assembly may pass through the space between the two reflecting members, or may pass through the space and partially or completely pass through the two reflecting portions.

In the embodiment of the present application, the first light emitting assembly and the second light emitting assembly may both adopt MCL lasers, and include a plurality of light emitting chips.

For example, fig. 8-1 and 8-2 show two MCL type lasers with different array arrangements, where the MCL type lasers include a plurality of light emitting chips arranged in an array, and light beams are emitted in row or column directions.

Fig. 8-1 shows an MCL laser having two rows and seven columns of light emitting chips, and fig. 8-2 shows an MCL laser having four rows and six columns of light emitting chips.

And, in one implementation, the converging lens group 105 may include at least one convex lens, and the convex arc surface of each convex lens faces the incident direction of the laser beam.

In the foregoing embodiments, the converging lens group 105 is illustrated as including two convex lenses, for example, the converging 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 converging optic 105 may also include one or three convex lenses. When the converging lens group 105 includes a plurality of convex lenses, the plurality of 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 plurality of convex lenses are collinear. The converging lens group 105 includes a plurality of convex lenses to ensure that the laser light incident into the converging lens group converges on the fluorescent wheel 103 more accurately.

And, based on the light source module architectures of the above embodiments, the first light emitting module and the second light emitting module are described with reference to the accompanying drawings:

in one implementation, the first light emitting assembly 1011 emits the first laser beam and the second laser beam with overlapping wavelength bands. Illustratively, the first laser beam and the second laser beam may both be blue light. For example, the wave bands of the first laser beam and the second laser beam can be 400-450 nanometers; or the wave band of the first beam of laser can be 400-430 nanometers, and the wave band of the second beam of laser can be 420-450 nanometers; or the wavelength bands of the first laser beam and the second laser beam may also be other wavelength bands, which is not limited in the embodiment of the present application.

In one implementation, the first laser beam and the second laser beam have different dominant wavelengths. For example, the first laser beam and the second laser beam may be blue light with 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.

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

Alternatively, the first light and the second light may also originate from different first light emitting assemblies, and the embodiment of the present application is not limited.

With continued reference to fig. 1-1, 2-1, and 2-2, the light emitting surface of the laser 1011 and the wheel surface or light receiving surface of the fluorescent wheel 103 may be parallel to each other.

The laser 1011, the light combining lens 102 or the first reflection part 1022a, the second reflection part 1022b, the converging lens group 105 and the fluorescent wheel 103 are sequentially arranged along the light emitting direction of the laser 1011, for example, the laser can directly emit laser to the transmission region of the light combining lens 102.

In one implementation, the laser 1011 can emit a laser beam that can be directed to each transmissive region of the combiner lens 102. Alternatively, the laser 1011 may emit a plurality of laser beams such that each laser beam is directed to one transmissive area.

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 reflecting mirror, the transmitting area in the light combining mirror, the fluorescent wheel, and the reflecting area in the light combining mirror and then is emitted to the condensing 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 the second light emitting mode of the laser, the laser can emit laser light to different reflecting 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 of the converging lens is improved. In this case, the light emitting chip in the laser does not need to continuously emit light, 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 may emit laser light to different reflective mirrors according to the switching timing of the fluorescent regions and the reflective regions in the fluorescent wheel, so that the laser light reflected by different reflective mirrors passes through the corresponding transmissive regions to emit to different regions (such as the fluorescent regions and the reflective regions) 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.

And, in one embodiment, the second light-emitting component 1012 can emit red light in a wavelength range of 610nm to 640nm, but can also emit red light in other wavelength ranges according to the color matching requirement of the light source component, and generally, the wavelength range between 620nm to 630nm is selected.

And the first light emitting element 1011 and the second light emitting element 1012 alternately emit light in one period, when the first light emitting element 1011 emits light, that is, the duty timing is valid, in this period, the light source module light outlet can obtain blue laser and green fluorescence (or green fluorescence and yellow fluorescence) in time sequence, when the first light emitting element 1011 does not emit light, that is, the duty timing is invalid, the second light emitting element 1012 emits light, and in this period, the light source module light outlet obtains red laser. Accordingly, by alternately lighting the first light emitting element 1011 and the second light emitting element 1012, a multi-primary color light including a blue laser, a red laser, and at least green fluorescence can be obtained.

Fig. 9 is a diagram illustrating an optical path architecture of a light source module according to an embodiment of the present disclosure.

As shown in fig. 9, the light source assembly 10 may include:

the converging mirror group 105 is located on the front side of the fluorescence wheel 103, is disposed in a light path where the first laser beam S1 and the second laser beam S2 enter the fluorescence wheel 103, and is configured to converge the excitation light beam to form a smaller excitation light spot, and specifically, is configured to converge the first laser beam S1 and the second laser beam S2 to enter the fluorescence wheel 103.

The first lens assembly 102 is located between the first light emitting assembly 1011 and the fluorescent wheel 103.

And the second light combining lens 109 is positioned at the intersection of the first laser beam S1, the second laser beam S2 and the third laser beam S3.

As shown in fig. 1-2 and fig. 1-3, when the first laser beam S1 and the second laser beam S2 are incident on the converging mirror group 105, they do not pass through the optical axis h of the converging mirror group 105, and are also not symmetrical with respect to the optical axis h. Further, the first laser beam S1 and the second laser beam S2 are distributed on two sides of the optical axis h of the converging lens group 105 and are not symmetrical with respect to the optical axis h.

Referring to fig. 9 and fig. 1-3, the fluorescence areas can be excited to generate first fluorescence E1 and second fluorescence E2 respectively corresponding to the first laser S1 and the second laser S2, and the first fluorescence E1 and the second fluorescence E2 can both be reflected by the fluorescence wheel 103 and respectively enter the first reflection area 1022a and the second reflection area 1022b of the first light combining lens 102 after being transmitted through the converging lens group 105.

And, with continued reference to fig. 9 and fig. 1-3, wherein the first reflective region 1022a and the second reflective region 1022b are both disposed obliquely to the wheel surface of the fluorescent wheel 103, in an implementation, the first reflective region 1022a and the second reflective region 1022b are different regions of the same first light combining lens, and are disposed along the same oblique angle. And, the first light combining lens 102 further has at least one transmission area, for example, a second transmission area 1021b is located between the first reflection area 1022a and the second reflection area 1022b, and the second transmission area 1021b can allow one of the first laser beam S1 and the second laser beam S2 to pass through, and direct the laser beam to the fluorescent wheel 103. The first reflection region 1022a and the second reflection region 1022b are not located in the optical paths of the first laser beam S1 and the second laser beam S2, and do not block the two excitation light beams.

Since the first fluorescence E1 and the second fluorescence E2 can be regarded as being excited at the same time and reflected by the fluorescence wheel 103, and collimated by the converging mirror assembly 105, the first fluorescence E1 and the second fluorescence E2 are incident on the reflecting surfaces of the first reflecting region 1022a and the second reflecting region 1022b, respectively, at the same time and reflected by the two reflecting members, in this example, both reflected toward the second light combining mirror.

Therefore, when the first laser beam and the second laser beam emitted by the first light-emitting assembly emit to the reflection area of the fluorescent wheel along with the rotation of the fluorescent wheel, the two laser beams are reflected by the reflection area of the fluorescent wheel, and then emitted to two different reflection parts after passing through the converging lens group again, and further reflected to the second light combining lens by the different reflection parts. When the two beams of light irradiate the fluorescent area, the two beams of light excite the fluorescent area to generate fluorescence in different directions, the fluorescence is reflected by the fluorescent wheel and then is emitted to different reflecting parts, and the different reflecting parts reflect the fluorescence to the direction of the second light combining lens, so that the first beam of laser, the second beam of laser, the first fluorescence and the second fluorescence all utilize the reflection of the fluorescent wheel, and the first light combining lens can complete the first light combining, thereby the combination of the excitation light beam and the laser beam can be realized by using fewer optical lenses, and simultaneously, the multiple beams of laser excitation light beams are simultaneously excited, thereby being beneficial to improving the light source brightness.

And, in fig. 9, the second light combining lens 109 is located in the emitting optical path of the first light combining lens 102, the third laser beam S3 emitted from the second light emitting assembly 1012 reaches the second light combining lens 109, and the second light combining lens 109 is a dichroic mirror and can reflect red and transmit blue-green, or can reflect red and transmit blue, green, and yellow.

At least a green phosphor material, which may be a phosphor, may be disposed in the phosphor zone of the phosphor wheel 103. A yellow fluorescent material may also be disposed in the fluorescent region. The fluorescent material of each color can emit fluorescent light of a corresponding color under excitation of laser light. In one embodiment, the fluorescence obtained by excitation may be one. As such, the fluorescent region of the fluorescent wheel 103 may emit green fluorescent light by the light emitted from the first light emitting assembly, or may also include yellow fluorescent light.

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 circumferentially. As shown in fig. 5-2, 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. The two sub-fluorescent regions may include a green fluorescent material and a red fluorescent material, respectively, or the two sub-fluorescent regions may include a green fluorescent material and a yellow fluorescent material, respectively, or the two sub-fluorescent regions may include a green fluorescent material and an orange fluorescent material, respectively.

It should be noted that the area ratio of each of the fluorescent and reflective regions in fig. 3-1 or fig. 5-2 is merely an example. 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. The laser emitted to the reflecting area of the fluorescent wheel is assumed to be blue laser; the sub-fluorescent region G1 comprises a yellow fluorescent material and can emit yellow 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.

Referring to fig. 1-3, a schematic optical path diagram of fluorescence excitation is shown, it should be noted that, as the fluorescence wheel rotates, different fluorescent materials may sequentially and repeatedly generate fluorescence according to the rotation sequence by using the same optical path diagram as that shown in fig. 1-3, and fluorescence of different colors may also be reflected, collimated, and finally reflected by the first and second

reflective regions

1022a and 1022b with reference to the paths shown in fig. 1-3. The excitation process of other fluorescence will not be described herein, and reference can be made to the foregoing description.

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 fluorescent material and a reflective coating may be applied to a ring structure having a poor light reflection effect to obtain a fluorescent wheel. Wherein the areas coated with the fluorescent material form the fluorescent regions of the fluorescent wheel and the areas coated with the reflective coating form the reflective regions of the fluorescent wheel.

The schematic path of the laser beam in the light source module will be described below with reference to fig. 9 and 1-2.

As shown in fig. 9 and fig. 1-2, the first laser beam S1 and the second laser beam S2 are both emitted from the first light emitting assembly 1011, and the first laser beam S1 and the second laser beam S2 are two separate non-overlapping beams, and in a specific implementation, the first laser beam S1 and the second laser beam S2 have a space therebetween, so as to allow the first laser beam S1 and the second laser beam S2 to be incident on different positions of the optical lens in the optical path.

As shown in fig. 9, the first light combining lens 102, which is disposed obliquely to the wheel surface of the fluorescent wheel 103, includes at least one transmissive region. As shown in fig. 6, in the present example, the first light combining lens 102 includes two transmission regions corresponding to the first laser beam and the second laser beam, wherein the first transmission region is located at an end of the first light combining lens 102 away from the fluorescent wheel 103, the first reflection region is located at an end of the first light combining lens 102 close to the fluorescent wheel 103, and the second transmission region and the second reflection region are located between the first reflection region and the first transmission region.

In one embodiment, the laser beam transmitted through the first transmission region, after irradiating onto the fluorescent wheel, is reflected or excites the fluorescent wheel to generate fluorescence, and both reflected and incident onto the first reflection region by the fluorescent wheel, and the laser beam transmitted through the second transmission region, after irradiating onto the fluorescent wheel, is reflected or excites the fluorescent wheel to generate fluorescence, and both reflected and incident onto the second reflection region by the fluorescent wheel.

As shown in fig. 9, the first laser beam S1 and the second laser beam S2 respectively transmit through different transmission regions (e.g., a first transmission region 1021a and a second transmission region 1021 b) of the first light combining lens 102, and both the first laser beam S1 and the second laser beam S2 are converged by the converging mirror assembly 105 and then incident on the fluorescence wheel 103. That is, the first laser beam S1 and the second laser beam S2 are emitted to the converging lens assembly 105 through different transmission regions of the first light combining lens 102, and then are converged by the converging lens assembly 105 and then are emitted to the fluorescent wheel 103.

When the fluorescent region receives the irradiation of the first laser beam S1 and the second laser beam S2, the fluorescent light generated by the excitation of the fluorescent region is reflected by the fluorescent wheel 103 and transmitted through the converging lens group 105; the first light combining lens 102 further includes a plurality of reflection areas (e.g., a first reflection area 1022a and a second reflection area 1022 b), the fluorescent light transmitted by the converging lens group 105 is incident to different reflection areas of the first light combining lens 102, and the different reflection areas of the first light combining lens 102 reflect the fluorescent light toward the light outlet. In this case, the first laser beam and the second laser beam are also excitation beams of fluorescence, and the fluorescence emitted from the fluorescence area can be referred to as an excited laser beam. In one embodiment, the light exit direction (e.g., x direction in fig. 2-1) of the light source module 10 can be perpendicular to the arrangement direction (i.e., y direction) of the first light combining lens 102, the converging lens assembly 105 and the fluorescent wheel 103.

When the reflection area of the fluorescence wheel 103 receives the irradiation of the first laser beam S1 and the second laser beam S2, the first laser beam S1 and the second laser beam S2 are reflected by the reflection area of the fluorescence wheel 103 and are transmitted through the converging lens group 105 again, and then are incident to different reflection areas of the first light combining lens 102, and the different reflection areas of the first light combining lens 102 reflect the first laser beam S1 and the second laser beam S2 toward the light outlet. As shown in fig. 1-2, the first laser beam S1 is reflected by the reflection region of the fluorescence wheel 103 and then transmitted through the converging mirror group 105 again, and then enters the first reflection region 1022a of the first light combining lens 102; the second laser beam S2 is reflected by the reflection region of the fluorescent wheel 103 and transmitted through the converging lens group 105 again, and then enters the second reflection region 1022b of the first light combining lens 102.

The transmission area or the reflection area of the first light combining lens 102 is arranged at intervals. For example, the transmissive areas and the reflective areas of the first light combining lens 102 may be alternately arranged. As shown in fig. 13, a second reflective region 1022b is spaced between the first transmissive region 10112a and the second transmissive region 10112b, and a second transmissive region 1021b is spaced between the first reflective region 1022a and the second reflective region 1022b.

The transmission area in the first light combining lens 102 can transmit light (such as a first laser beam and a second laser beam) emitted by the first light emitting assembly 1011, and the reflection area in the first light combining lens 102 can reflect all incident light (such as fluorescent light, the first laser beam, and the second laser beam) to the light outlet of the light source assembly 10.

The converging mirror group 105 converges both the two light beams to the front of the fluorescent wheel 103 to form a smaller excitation spot.

When the reflection region of the fluorescence wheel 103 receives the irradiation of the first laser beam S1 and the second laser beam S2, the first laser beam S1 and the second laser beam S2 may be reflected by the reflection region of the fluorescence wheel 103, and may be incident on the first reflection region 1022a and the second reflection region 1022b of the first light combining lens 102 after being transmitted through the converging lens group 105 again.

For example, a connecting line between a position to which a first laser beam is emitted in the converging lens group and a converging position of the first laser beam on the fluorescent wheel is a first connecting line, and an included angle between the first connecting line and an optical axis of the converging lens group is a first included angle; a connecting line between the position irradiated by the second beam of laser in the converging lens group and the converging position of the second beam of laser on the fluorescent wheel is a second connecting line, and an included angle between the second connecting line and the optical axis of the converging lens group is a second included angle; the first included angle is different from the second included angle. For example, referring to fig. 1-2, a first included angle formed by the first laser beam S1 and the optical axis h of the focusing lens group 102 is an angle α, a second included angle formed by the second laser beam S2 and the optical axis h of the focusing lens group 102 is an angle β, and α > β. Thus, the first laser beam and the second laser beam may be incident on the mirror surface of the converging mirror group at different incident angles, for example, the convex surface of the first lens of the converging mirror group, but according to the reflection principle, the respective reflection optical paths of the first laser beam and the second laser beam will not overlap, so that the first laser beam and the second laser beam reflected by the reflection area of the fluorescence wheel may be incident on the first reflection area 1022a and the second reflection area 1022b, respectively, along different reflection optical paths, and reflected by the two reflection components, for example, emitted toward the second light combining mirror.

And, in order to realize the excitation light path shown in fig. 9, fig. 1-2, and fig. 1-3, when the first light combining lens includes only one transmissive region, that is, only the second transmissive region located between the two reflective regions, one of the first laser beam and the second laser beam may also be transmitted through the second transmissive region between the first reflective region and the second reflective region of the first light combining lens, and the other may be transmitted through the first reflective region or the second reflective region on a side away from the second transmissive region, for example, the other may be considered to be transmitted through an outer side of one of the two reflective regions.

And, as shown in fig. 9, the light emitting surface of the first light emitting element 1011 is perpendicular to the wheel surface of the fluorescent wheel 103, rather than parallel to each other. The turning lens 108 is further disposed along the light-emitting surface direction of the first light-emitting assembly 1011 for reflecting the light beam emitted by the first light-emitting assembly to the wheel surface direction of the fluorescent wheel 103.

The light source assembly 10 may further include a plurality of turning lenses 108, the turning lenses 108 may be arranged along the light emitting direction of the laser 1011, and the turning lenses 108 are configured to reflect the light beams emitted from the laser 10 to form a plurality of light beams. The distances between the turning lenses 108 and the light-emitting surface of the laser 1011 may all be different. As shown in fig. 3-2, the turning mirrors 108 may include two turning mirrors, which are respectively used to reflect different portions of the light beam emitted from the laser 1011 to form the first laser beam S1 and the second laser beam S2, and there is a gap between the first laser beam S1 and the second laser beam S2.

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

In one embodiment, each surface of the turning lens may be reflective, or only the surface of the turning lens facing the laser 1011 may be reflective. In the embodiment of the present application, the number of turning lenses may be an integer greater than or equal to 1, and fig. 9 illustrates that the light source assembly 10 includes two turning lenses, and in a specific implementation, the number of the turning lenses may also be one, three, four or more. When the light source assembly only comprises one turning lens, the turning lens can be used for adjusting the transmission direction of the laser emitted by the laser. When the light source assembly comprises a plurality of turning lenses, the turning lenses can be used for splitting the laser emitted by the laser, and the distance between the split laser beams can be adjusted by adjusting the positions of the turning lenses.

The laser 1011 may also emit a plurality of laser beams, such as four or more laser beams, and the plurality of laser beams may be respectively emitted to two turning mirrors 108, and each turning mirror 108 reflects and outputs a laser beam.

As shown in fig. 5-1 and 5-2, the larger the distance between two turning lenses 108 in the light source module in the x direction (i.e., the light emitting direction of the laser 1011), the larger the distance between the two laser beams obtained by splitting the laser light emitted by the laser 1011. Therefore, the distance between the laser beams emitted from the turning lenses 108 can be adjusted by adjusting the distance between the turning lenses 108 in the light emitting direction of the laser 1011, so as to achieve the purpose of being incident to different positions on the optical lens.

Fig. 10 shows a schematic view of the optical path of another light source module. Unlike the example shown in fig. 9, in this example, the turning mirror is not disposed on the first light emitting element 1011, and the arrangement of the second light emitting element 1012 is changed by 90 degrees compared with the example shown in fig. 9, so that the reflective mirror 110 is required to be disposed to guide the third light beam S3 to the reflective surface of the second light combining mirror 109.

The reflective mirror 10 may also be a reflective vibration mirror, and may also perform energy homogenization on the laser beam to reduce the speckle effect while changing the optical path direction of the third laser beam.

And, for the purpose of reducing speckle effect, the reflective mirror 10 may also be a rotating reflective diffuser structure.

And the third laser that expands the beam still does benefit to and has the clearance thereby the great first laser of facula, second laser, first fluorescence, second fluorescence mix, and when the facula size difference is less, the color uniformity of mixed light facula also can be better.

And, fig. 11 also shows a schematic view of the optical path of another light source module. In fig. 11, reference may be made to the related description in fig. 9 for the arrangement of the first light emitting assembly 1011, and reference may be made to the related description in fig. 2 for the arrangement of the second light emitting assembly 1012, which is not described again here. Fig. 11 adopts the above-mentioned light source module, the turning lens 108 can be utilized to conveniently realize that the first laser beam and the second laser beam are incident to different positions of the same optical lens, so as to realize the generation of fluorescence with higher brightness under the excitation of high power. And, when adopting the mode that the second light emitting component sets up reflective vibration part or reflective rotating part in fig. 11, do benefit to and alleviate the speckle effect of second light emitting component, and do benefit to the even light of the facula of different colours.

And, fig. 12 shows a schematic view of the optical path of yet another light source module. Unlike fig. 11, in fig. 12, the laser beam emitted from the first light-emitting assembly 1011 passes through the beam-reducing lens 106 before being transmitted through the first light-combining lens 102. And the first and

second reflection regions

1022a and 1022b are located between the first light emitting assembly 1011 for reducing the spot size of the first and second laser beams emitted from the first light emitting assembly. The beam reduction lens group 106 can make the emitted laser beam thinner than the incident laser beam, so as to pass through the lens in the rear light path.

In one implementation, the beam reduction mirror group 106 can be a telescopic mirror group, and the beam reduction mirror group 106 can include a convex lens 1061 and a concave lens 1062. In one embodiment, the optical axes of the beam reducing lens group 106 and the converging lens group 105 may be collinear or coincident.

In one embodiment, the positions of the mirror surfaces of the first laser beam and the second laser beam incident on the beam reduction mirror 106 are different, and neither the first laser beam nor the second laser beam passes through the optical axis of the beam reduction mirror.

Specifically, in the schematic diagram of the light source module shown in fig. 12, the laser 1011 can emit two beams, and the two beams are formed into two laser beams by the turning action of the turning lens 108 to the beam reduction mirror 106. The first laser beam and the second laser beam do not pass through the optical axis of the beam shrinking mirror group 6, and pass through the beam shrinking of the beam shrinking mirror group 106, and the first laser beam and the second laser beam both thin and avoid the first reflection region 1022a and the second reflection region 1022b, and emit to the converging mirror group 105. The optical axes of the converging mirror group 105 and the beam shrinking mirror group coincide, the first laser beam and the second laser beam which pass through the beam shrinking irradiate different positions of the mirror surface of the converging mirror group, and are converged and then enter the same spot position of the fluorescence wheel to excite the fluorescence area of the fluorescence wheel 103 or be reflected by the reflection area of the fluorescence wheel 103.

The first laser beam, the second laser beam, or the first fluorescent light and the second fluorescent light reflected by the fluorescent wheel are sequentially emitted to the first reflective region 1022a and the second reflective region 1022b, and are reflected by the two reflective portions to the second light combining lens, thereby forming a sequential illumination beam.

And, the light source assembly 10 in the embodiment of the present application may further include: a third lens 107. The first laser beam and the second laser beam are transmitted through the beam reduction lens group 105 and pass through a third lens 107 before being incident on the fluorescence wheel 103, and the third lens 107 may be a light homogenizing lens, such as a diffusion sheet. The third lens 107 can be located between the beam-shrinking mirror 106 and the first and second

reflective regions

In one implementation, the third optic may also be a fly-eye lens.

In this embodiment, after the first beam of light and the second beam of light pass through the first light combining lens 102 and emit 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 first light combining lens 102, and then different reflection areas in the first 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 first 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 first light combining lens 102, and then the fluorescence can be reflected to the light outlet by the reflection area in the first light combining lens 102.

In the above example, the transmission process of the light is illustrated when the first light and the second light emitted by the first light emitting element 1011 pass through the first transmission area 1021a and the second transmission area 1021b of the first light combining lens 102, respectively, and then are emitted 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 first 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 light emitted from the first 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 in the first light combining lens 102 and the transmissive area in the first light combining lens 102, and the light transmission process in this case is not illustrated in this embodiment of the present application.

In one embodiment, the color of the laser light emitted from the first light emitting assembly, the color of the laser light emitted from the second light emitting assembly, and the color of the fluorescent light emitted from the fluorescent area may all be different. For example, the first light-emitting assembly can emit blue laser, namely, the first light beam and the second light beam are both blue laser; the second light-emitting component can emit red laser, namely the third light is red laser; the fluorescent region emits at least one of green fluorescence and yellow fluorescence. In a specific implementation, the laser light emitted by the first light emitting assembly, the laser light emitted by the second light emitting assembly, and the fluorescent light emitted by the fluorescent region may also be of other colors, which is not limited in this embodiment.

In the above one or more embodiments of the present disclosure, the first laser beam and the second laser beam emitted by the first light emitting assembly are both used as excitation light and emitted to different positions of the mirror surface of the converging mirror group, which are not symmetrical with respect to the optical axis of the converging mirror group, and the fluorescence wheel can be excited to generate the first fluorescence and the second fluorescence in different emission directions.

Since the laser beam is a high-energy beam, if it is desired to increase the luminous power of the fluorescence by increasing the energy density of the single laser beam, not only unreliability and higher heat-resistant requirements are brought to the optical lens in the optical path, which leads to an increase in the cost of the optical path architecture, but also the problem of heat dissipation of the fluorescence wheel due to the irradiation of the high-energy-density beam may be caused, which reduces the fluorescence conversion efficiency.

In this application technical scheme, set up laser excitation light beam into two bundles, to setting up the lens in the excitation light path, two different bundles of light shines to the different positions of lens, can alleviate the lens part and receive the ageing or the performance degradation problem that high energy beam shines and bring for a long time.

And the two laser beams are irradiated to different positions of the converging lens group, and then the directions of incidence to the fluorescent wheel are different, when the two laser beams converge on the reflecting area of the fluorescent wheel, the two laser beams are reflected and then penetrate through the collimating lens group again to be emergent according to the reflection law, so that the two laser beams are incident to different reflecting components and are reflected by different reflecting components.

Therefore, the light source component can output the blue laser beam and the fluorescent beam in a time sequence along with the rotation time sequence of the fluorescent wheel.

And for the second light emitting assembly, a third laser beam can be emitted when the first light emitting assembly is not lighted, and the third laser beam directly irradiates the second light combining lens, so that the third laser beam and the blue laser beam and the fluorescent light beam can jointly form three-primary-color or four-primary-color output of the light source.

In the technical solution of the present application, the first light combining lens is used as a guide component for the first laser beam and the second laser beam emitted by the first light emitting component to enter the fluorescent wheel, and is also used as a light receiving component for the first laser beam and the second laser beam after being reflected by the fluorescent wheel, and is combined in the same direction, so that the first light combining lens is multiplexed in the fluorescent excitation process.

And, in this application technical scheme, the last laser reflection district that is provided with of fluorescence wheel, set up laser transmission district and then need set up relay circuit system and compare with the correlation technique, the light source subassembly optical component in this application scheme is few, and the light path framework is compact, can also compromise the miniaturization of light source subassembly when realizing higher luminous power.

As an improvement or modification of the foregoing embodiment, in a specific implementation, a light collecting component may be further disposed in the light outlet direction of the light source assembly 10, or the collecting lens 104 and the light collecting component are sequentially disposed to complete the collection of the fluorescent light and the laser light beams reflected in time sequence by the second light combining lens, and the collected fluorescent light and the laser light beams are used as the output of the light source assembly.

The embodiment of the present application further provides a laser projection device, as shown in the schematic diagram of the ultra-short-focus laser projection device shown in fig. 7, the projection device projects obliquely upward to the optical screen for imaging, the projection device is closer to the plane where the optical screen is located, and large-size projection display can be realized with a smaller projection ratio.

And fig. 6 shows a projection light path schematic diagram of a laser projection apparatus. As shown in fig. 6, the light beam output by the light source assembly 100 is incident into the optical engine 200, and the optical engine 200 further emits the light beam into the lens 300.

The light source module 100 further includes a plurality of optical lenses for combining and condensing the laser beam and the fluorescent beam. The light source assembly 100 may be any of the light source assembly solutions of the embodiments described above. And will not be described in detail herein.

The light beam emitted from the light source assembly 100 is incident to the optical engine 200, and a homogenizing component, such as a light pipe, is disposed at the front end of the optical engine 200 for receiving the illumination light beam of the light source, and has the functions of mixing and homogenizing, and the outlet of the light pipe is rectangular, and has a shaping effect on the light spot. The optical engine 200 further includes a plurality of lens groups, and the TIR or RTIR prism is used to form an illumination light path, and to inject the light beam to the light valve, which is a key core device, and to inject the light beam modulated by the light valve into the lens group of the lens 300 for imaging.

Depending on the projection architecture, the Light valve can include a variety of LCOS, LCD or DMD, and in this example, a DLP (Digital Light Processing) projection architecture is used, and the Light valve is referred to as a DMD chip or Digital micromirror array. Before the light beam of the light source 100 reaches the light valve DMD, the light path of the light machine is shaped to make the illumination light beam conform to the illumination size and the incident angle required by the DMD. The DMD surface includes thousands of tiny mirrors, each of which can be individually driven to deflect, such as plus or minus 12 degrees or plus or minus 17 degrees in a DMD chip provided by TI. The light reflected by the positive deflection angle is called ON light, the light reflected by the negative deflection angle is called OFF light, and the OFF light is ineffective light and generally hits the shell or is absorbed by a light absorption device. The ON light is an effective light beam which is irradiated by the illumination light beam received by a tiny mirror ON the surface of the DMD light valve and enters the lens 300 through a positive deflection angle, and is used for projection imaging. The quality of the illumination beam emitted from the light source assembly 100 directly affects the quality of the beam irradiated onto the surface of the light valve DMD, so that the beam is projected and imaged by the lens 300 and then reflected on a projection picture.

In this example, the lens 300 is an ultra-short-focus projection lens, and the light beam modulated by the light valve enters the lens and finally exits in an oblique direction, which is different from a light exit mode in which the optical axis of the projection light beam is located at the perpendicular bisector of the projection screen in the conventional long-focus projection, the ultra-short-focus projection lens usually has an offset of 120% to 150% relative to the projection screen, the projection mode has a smaller throw ratio (which can be understood as a ratio of the distance from the projection host to the projection screen to the size of the diagonal of the projection screen), for example, about 0.2 or less, and the projection device can be closer to the projection screen, so that the projection device is suitable for home use, but the light exit mode also determines that the light beam has higher uniformity, otherwise, the luminance or chromaticity non-uniformity of the projection screen is more obvious compared with the conventional long-focus projection.

In this example, when a DMD light valve assembly is used, the light source 100 can output three primary colors in a time sequence, and the human eye cannot distinguish the colors of light at a certain time according to the principle of three-color mixing, and still perceives mixed white light. When a plurality of light valve components, such as three DMD or three LCD liquid crystal light valves, are used, the three primary colors of light in the light source 100 can be simultaneously lit to output white light.

The projection equipment that this application embodiment provided is owing to use the light source subassembly in above-mentioned a plurality of embodiments, and blue light return circuit has been cancelled to above-mentioned light source subassembly to less optical lens and compact optics framework realize the output of at least three chromatic lights, on the miniaturized basis of above-mentioned light source subassembly, also do benefit to the miniaturization that realizes laser projection equipment optical engine structure, and still can bring the facility for arranging of other structures in the projection equipment, for example this other structure 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 related 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 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: there are seven cases of A alone, B alone, C alone, both A and B, both A and C, both C and B, and both A, B and C. 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.

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

A light source assembly, comprising:

the first light-emitting component is used for emitting a first laser beam and a second laser beam;

the second light-emitting component is used for emitting a third laser beam, and the color of the third laser beam is different from that of the first laser beam and the second laser beam;

the fluorescent wheel is provided with a fluorescent area and a reflecting area;

the converging lens group is used for converging the first laser beam and the second laser beam to be incident on the fluorescence wheel;

when the fluorescent area receives the irradiation of the first laser beam and the second laser beam, the fluorescent area can be excited to respectively generate first fluorescent light and second fluorescent light;

the first fluorescence and the second fluorescence are both reflected by the fluorescence wheel, are transmitted through the converging mirror group, are respectively incident to the first reflecting part and the second reflecting part, and are respectively reflected by the first reflecting part and the second reflecting part to the direction of a light outlet of the light source assembly;

the first reflection part and the second reflection part are parallel to each other and have a space;

when the reflecting region of the fluorescence wheel receives the irradiation of the first laser beam and the second laser beam, the first laser beam and the second laser beam are reflected by the reflecting region of the fluorescence wheel, then are transmitted again through the converging mirror group, enter the first reflecting part and the second reflecting part, and are reflected by the first reflecting part and the second reflecting part towards the light outlet direction of the light source component;

the third laser beam is emitted to the direction of the light outlet of the light source component at least through the interval between the first reflecting part and the second reflecting part.
The light source assembly of claim 1, wherein a turning lens is disposed in a light emitting direction of the first light emitting assembly, and the turning lens is configured to separate a laser beam emitted by the first light emitting assembly into the first laser beam and the second laser beam.
The light source module as recited in claim 1, wherein one of the first laser beam and the second laser beam is transmitted through a space between the first reflector and the second reflector, and the other is transmitted through a side of the first reflector or the second reflector away from the space, and both are directed to the fluorescent wheel.
The light source module as claimed in claim 1, wherein a connecting line between a position of the mirror surface of the first laser beam and a position of the second laser beam incident on the converging mirror group and a position of the converging mirror on the fluorescent wheel forms a different angle with an optical axis of the converging mirror group.
The light source assembly according to claim 1, wherein the first laser beam and the second laser beam are incident on the mirror surfaces of the converging mirror group at different distances from the optical axis of the converging mirror group.
The light source module as claimed in claim 1, wherein the first laser beam and the second laser beam are distributed on two sides of the optical axis of the converging lens group and are not symmetrical with respect to the optical axis of the converging lens group.
The light source module as claimed in claim 1, wherein the third laser beam further transmits through a side of the first reflector or the second reflector away from the gap and is directed towards the light outlet of the light source module.
The light source module according to claim 1, further comprising a beam reducing mirror group for reducing the spots of the first and second laser beams emitted from the first light emitting assembly, and wherein the optical axes of the beam reducing mirror group and the converging mirror group coincide.
The light source assembly of claim 1, wherein the first and second reflective portions are both mirrors;

alternatively, the first and second reflection portions may be dichroic mirrors that transmit red light and reflect light other than red light.
The light source assembly according to claim 1, wherein the first and second reflective portions are dichroic mirrors capable of transmitting red light and reflecting light other than red light, or capable of transmitting red light and reflecting at least a specific wavelength range of blue light and green light.
The light source assembly of claim 2, wherein the turning lenses are multiple, and each turning lens has a different distance from the light-emitting surface of the first light-emitting assembly.
The light source module according to any one of claims 1 to 11, wherein the wavelength bands of the first laser beam and the second laser beam have an overlap.
A projection device, characterized in that the projection device comprises: the light source module of any one of claims 1 to 12, and an opto-mechanical and lens;

the light source assembly is used for emitting illuminating beams to the light machine, the light machine is used for modulating the illuminating beams emitted by the light source assembly and projecting the illuminating beams to the lens, and the lens is used for imaging the light beams modulated by the light machine.