CN113900335A

CN113900335A - Light source assembly and projection equipment

Info

Publication number: CN113900335A
Application number: CN202010576382.8A
Authority: CN
Inventors: 李巍; 顾晓强; 田有良
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2020-06-22
Filing date: 2020-06-22
Publication date: 2022-01-07

Abstract

The application discloses a light source assembly and laser projection equipment, wherein the light source assembly comprises a light-emitting assembly, a first laser and a second laser are emitted from the light-emitting assembly, and a third laser different from the two lasers is emitted from the second light-emitting assembly; the first beam of laser and the second beam of laser are incident to the fluorescent wheel, can excite the fluorescent area to generate first fluorescence and second fluorescence respectively, and the first fluorescence and the second fluorescence are reflected by the fluorescent wheel, then are incident to different reflecting areas of the first light combining lens respectively and are reflected to the second light combining lens; 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 different reflecting areas of the first light combining lens and are reflected to the second light combining lens. The second light combining lens reflects the third laser beam and transmits the light beam reflected by the first light combining lens, so that the combined light output of the laser and the fluorescence is realized. The light source subassembly among this application technical scheme compromises hi-lite output and reasonable overall arrangement.

Description

Light source assembly and projection equipment

Technical Field

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

Background

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

The application provides a light source subassembly and projection equipment, can compromise the high brightness output and the reasonable overall arrangement of equipment. The adopted technical scheme is as follows:

in one aspect, there is provided 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;

a first light combining lens having a plurality of reflective regions and at least one transmissive region,

the second light combining lens is arranged at the intersection of the first laser beam, the second laser beam and the third laser beam;

the first beam of light and the second beam of light are respectively transmitted to the fluorescence wheel through different transmission areas of the first light combining lens, and the fluorescence areas can be excited to respectively generate first fluorescence and second fluorescence; the first fluorescence and the second fluorescence are reflected by the fluorescence wheel and then enter different reflection areas of the first light combining lens, and are reflected to the second light combining lens by the different reflection areas of the first light combining lens respectively;

the first laser beam and the second laser beam can be reflected by the reflection area of the fluorescent wheel, then enter different reflection areas of the first light combining lens and are reflected to the second light combining lens by different reflection areas of the first light combining lens respectively;

the second light combining lens reflects the third laser beam and transmits the first laser beam, the second laser beam, the first fluorescence and the second fluorescence.

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

the light source module that this application provided wherein first laser beam and the second laser beam that first light emitting component sent are as the exciting light, arouse the fluorescence wheel and produce different first fluorescence and second fluorescence. The second light-emitting component emits a third laser beam, the color of the third laser beam is different from that of the first laser beam and that of the second laser beam, and the light source component is a bicolor laser light source component.

First, a first beam of laser and a second beam of laser are emitted as excitation light, so that the fluorescent wheel is excited to generate a first fluorescent light and a second fluorescent light in different emitting directions, the two beams of fluorescent light are respectively incident to a first reflecting area and a second reflecting area of the first light combining lens and then reflected to the second light combining lens, the first beam of laser and the second beam of laser are also reflected by the reflecting area of the fluorescent wheel and are also incident to the first reflecting area and the second reflecting area of the first light combining lens and are reflected to the second light combining lens in the same way. Therefore, the first reflecting area and the second reflecting area of the first light combining lens can reflect the first laser beam, the second laser beam and the fluorescent light beam in the same direction at least in a time-sharing mode, and the light combining of the first laser beam, the second laser beam and the fluorescent light is completed.

And a third beam of laser emitted by the second light-emitting component is emitted to the second light-combining lens. And the second light combining lens reflects the third laser beam, transmits the first laser beam, the second laser beam, the first fluorescence and the second fluorescence reflected by the first light combining lens, and completes light combination.

Two bundles of laser can be utilized in the above-mentioned light source subassembly as excitation light source simultaneously, and all utilize the reflection of fluorescence wheel, and the reflection of sharing first light lens that closes accomplishes the first light that closes of excitation light sum fluorescence to set up second light-emitting component in the route of the first light output that closes, send the third bundle of laser, and utilize the second to close the light lens and accomplish and close the light, thereby the optical component overall arrangement in the light source subassembly is more compact.

In this application technical scheme, fluorescence takes turns to and is provided with the laser reflection district, sets up the laser reflection district and then need set up relay loop system in with the correlation technique and compare, and the relay that uses changes the optical component few in the light source subassembly in this application scheme, has saved the space of arranging, also makes the light path framework compact, can also compromise the miniaturization of light source subassembly when realizing higher luminous power, higher luminance output.

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 and imaging the light beams modulated by the light machine.

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

Drawings

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

Fig. 1 is a schematic optical path diagram of a light source module provided in an embodiment of the present application;

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

FIG. 3 is another schematic optical path diagram of a light source module provided by an embodiment of the present application;

fig. 4 is a schematic view illustrating still another optical path of a light source module provided in an embodiment of the present application;

FIG. 5-1 is a schematic wheel surface view of a fluorescent wheel provided in embodiments of the present application;

FIG. 5-2 is a schematic wheel surface view of a fluorescent wheel provided in embodiments of the present application;

FIG. 6-1 is a schematic diagram of an optical path of a laser beam incident on a fluorescent wheel according to an embodiment of the present application;

FIG. 6-2 is a schematic diagram of the optical path of fluorescence excitation provided by an embodiment of the present application;

fig. 7 is a schematic plan view of a first light combining lens provided in the present embodiment;

8-1, 8-2 are schematic optical path diagrams of a light emitting assembly provided by an embodiment of the present application;

FIG. 9 is a schematic optical path diagram of a projection apparatus provided in an embodiment of the present application;

FIG. 10 is a schematic structural diagram of a projection apparatus provided in an embodiment of the present application;

fig. 11-1 and 11-2 are schematic structural views of a light emitting device according to an embodiment of the present disclosure.

Detailed Description

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

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 includes a laser capable of emitting laser light of at least one color, such as blue laser light. 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 is a schematic view illustrating an optical path architecture of a light source module according to an embodiment of the present disclosure.

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

the first light emitting assembly 1011 is used for emitting a first laser beam S1 and a second laser beam S2.

A second light emitting assembly 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 used for converging the excitation light beam to form a smaller excitation light spot, and specifically is used for converging 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 on different positions of the mirror surface of the converging mirror assembly 105, and are both incident on the fluorescence wheel 103 after being converged by the converging mirror assembly 105.

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

The second beam combining lens 109 is located at the intersection of the first laser beam S1, the second laser beam S2, and the third laser beam S3.

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

When the phosphor screen receives 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 module at the same time, and may also be regarded as being used to excite the phosphor screen at the same time.

As shown in fig. 6-1 and 6-2, the first laser light S1 and the second laser light S2 do not pass through the optical axis h of the converging lens group 105 and are not symmetrical with respect to the optical axis h when being incident on the converging lens group 105. 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 line connecting the position of the mirror surface of the first laser beam S1 and the position of the second laser beam S2 incident on the focusing lens assembly 105 and the respective focusing position on the fluorescent wheel 103 forms an included angle with the optical axis h of the focusing lens assembly 105, which is different, for example, an included angle is α and an included 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 one embodiment, 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 optical axis h are different, the two laser beams may be located at two sides of the optical axis h, or 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. 1 and 6-2, the fluorescence areas can be excited to generate a first fluorescence E1 and a 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. 1 and 6-2, wherein the first reflective region 1022a and the second reflective region 1022b are both disposed at an angle 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 angle of inclination. 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 almost simultaneously excited and reflected by the fluorescence wheel 103, and the light beam is collimated by the converging mirror assembly 105, the first fluorescence E1 and the second fluorescence E2 are almost simultaneously incident on the reflective surfaces of the first reflective region 1022a and the second reflective region 1022b, respectively, and are reflected by the two reflective members, in this example, both 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. 1, the second light combining lens 109 is located in the exit light path of the first light combining lens 102, the second light emitting assembly 1012 emits the third laser light S3 to reach 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.

And, referring to fig. 5-1, 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 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. 5-2, the fluorescent zone 1031 may include two sub-fluorescent 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. 5-1 or 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 yellow fluorescent material capable of emitting 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. 6-2, 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 time sequence by using the same optical path diagram as that of fig. 6-2, and the 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 path illustrated in fig. 6-2. 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 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 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 will be described below with reference to fig. 1 and 6-1.

As shown in fig. 1 and 6-1, 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 laser 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.

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 a single 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. 1, 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 is incident to the first reflection region after being irradiated onto the fluorescent wheel and being reflected with the wheel, or exciting the fluorescent wheel to generate fluorescence, and the laser beam transmitted through the second transmission region is incident to the second reflection region after being reflected by the fluorescent wheel.

As shown in fig. 1, the first laser light S1 and the second laser light S2 respectively transmit through different transmission regions (e.g., the first transmission region 1021a and the second transmission region 1021 b) of the first light combining lens 102, and the first laser light S1 and the second laser light S2 are converged by the converging lens 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 areas 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 fluorescence area receives the irradiation of the first laser beam S1 and the second laser beam S2 as the fluorescence wheel 103 rotates, fluorescence generated by the fluorescence area is reflected by the fluorescence wheel 103 and is transmitted through the converging mirror group 105; the first light combining lens 102 further includes a plurality of reflective regions (e.g., a first reflective region 1022a and a second reflective region 1022 b), the fluorescent light transmitted by the converging lens assembly 105 is incident to different reflective regions of the first light combining lens 102, and the different reflective regions 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 region of the fluorescent 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 region of the fluorescent wheel 103 and transmitted through the converging mirror group 105 again, and then are incident on different reflection regions of the first light combining lens 102, and the different reflection regions of the first light combining lens 102 reflect the first laser beam S1 and the second laser beam S2 toward the light outlet direction. As shown in fig. 6-1, the first laser light S1 is reflected by the reflection area of the fluorescence wheel 103 and is transmitted through the converging lens assembly 105 again, and then is incident on the first reflection area 1022a of the first light combining lens 102; the second laser beam S2 is reflected by the reflection area of the fluorescent wheel 103 and transmitted through the converging lens assembly 105 again, and then enters the second reflection area 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. 6, 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 1022 b.

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 light S1 and the second laser light S2, the first laser light S1 and the second laser light 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 again through the converging lens group 105.

In one embodiment, the respective connecting lines of 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 fluorescence wheel are different from the 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. 6-1, 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, and 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, where 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.

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 optical path shown in fig. 1, 6-1 and 6-2, 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. 1, 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.

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. 5-2, the turning mirrors 108 may include two turning mirrors for reflecting 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. 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. 8-1 and 8-2, 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. 8-1 and 8-2, 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, so as to achieve the purpose of being incident to different positions on the optical lens.

Fig. 2 shows a schematic view of the optical path of another light source module. Unlike the example shown in fig. 1, in this example, the turning mirror is not disposed on the first light emitting element 1011, and the disposition of the second light emitting element 1012 is changed by 90 degrees compared with the example shown in fig. 1, 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 homogenize energy of 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. 3 also shows a schematic view of the optical path of another light source module. In fig. 3, reference may be made to the related description in fig. 1 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. 3 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. 3, 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.

Fig. 4 shows a schematic view of the optical path of yet another light source module. Unlike fig. 3, in fig. 4, the laser beam emitted from the first light emitting assembly 1011 passes through the beam shrinking mirror 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 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 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.

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.

Specifically, in the light source module diagram shown in fig. 4, the laser 1011 can emit two beams of light, and the two beams of light are formed by the turning action of the turning lens 108 and 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 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

1022a and 1022 b. 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.

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 1022 b. In a specific implementation, for the case that the light emitted from the first light-emitting component 101 is directed to the fluorescence area of the fluorescence wheel 103, the fluorescence emitted from the fluorescence area may be directed to both the reflection area in the first light-combining lens 102 and the transmission area in the first light-combining lens 102, and the light transmission process in this case is not illustrated in the 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 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.

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 component, a third laser beam can be emitted when the first light-emitting component is not lighted, and the third laser beam is directly emitted to the second light combining lens, so that the third or fourth primary color output of the light source can be formed together with the blue laser beam and the fluorescent light beam.

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 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.

And, in this application technical scheme, the fluorescence takes turns to and is provided with the laser reflection district, set up laser transmission district and then need set up relay loop system in the correlation technique and compare, and 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 above embodiment, in a specific implementation, a light collecting component may be further disposed in the light outlet direction of the light source module 10, or the collecting lens 104 and the light collecting component are sequentially disposed to complete the collection of the fluorescence and the laser beams sequentially reflected by the second light combining lens, and the fluorescence and the laser beams are used as the output of the light source module.

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. 11-1 and 11-2 show two different MCL lasers arranged in an array, where the MCL lasers include a plurality of light emitting chips arranged in an array, and light beams are emitted in a row or column direction.

Fig. 11-1 shows an MCL laser having two rows of seven columns of light-emitting chips, and fig. 11-2 shows an MCL laser having four rows of six columns of light-emitting chips.

In one embodiment, the converging lens group 105 may include at least one convex lens, and the convex arc surface of each convex lens faces the first light combining lens 102.

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 first 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.

For example, with continuing reference to fig. 1, fig. 2, fig. 3, and fig. 4, the first transmission area 1021a is located at an end of the first light combining lens 102 away from the fluorescent wheel 103, and the first reflection area 1022a is located at an end of the first light combining lens 102 close to the fluorescent wheel 103. The second transmissive region 1021b may be a transmissive region through which the laser light transmitted to the reflective region in the fluorescent wheel 103 is transmitted, and the first transmissive region 1021a may be a transmissive region through which the laser light transmitted to the fluorescent region in the fluorescent wheel 103 is transmitted. For example, as the fluorescent wheel 103 rotates, when the reflection region of the fluorescent wheel 103 is located at the irradiation region of the laser light emitted by the first light emitting element 1011, the laser 1011 can emit the laser light to the turning lens closer to the laser; the laser light can be reflected on the turning lens and then emitted to the reflection area of the fluorescent wheel 103 through the second transmission area 1021b, and the reflection area of the fluorescent wheel 103 can reflect the laser light to the second reflection area 1022 b. When the fluorescent area on the fluorescent wheel 103 is located in the irradiation area of the laser emitted by the first light emitting assembly 1011, the laser 1011 can emit the laser to the turning lens farther away from the laser; the laser can be reflected on the turning lens and then emitted to the fluorescence area through the first transmission area 1021 a; the fluorescent region may emit fluorescent light toward the first reflective region 1022a under excitation of the laser light. Since the optical path of the fluorescence from the fluorescence wheel 103 to the first reflection region 1022a is short, the light spot formed by the fluorescence on the first reflection region 1022a is small, the light beam of the fluorescence is thin, and the first reflection region 1022a easily reflects all the fluorescence to the light outlet of the light source module.

In one embodiment, the first light combining lens 102 may be disposed obliquely to the traveling direction of the first laser beam and the second laser beam emitted by the first light emitting assembly, that is, an included angle exists between the first light combining lens 102 and the traveling direction. The first light combining lens 102 can be inclined toward the light outlet. Alternatively, the first light combining lens 102 is disposed to be inclined at 45 degrees with respect to the wheel surface of the fluorescence wheel 103.

In one implementation, the number of the transmissive areas and the reflective areas in the first light combining lens 102 may be greater than or equal to the number of the light beams emitted by the first light emitting assembly. For example, in the embodiment of the present application, the first light emitting assembly 1011 emits two beams of light, and the first light combining lens 102 includes two transmissive regions and two reflective regions. In a specific implementation, the number of the transmission areas and the reflection areas in the first light combining lens 102 may also be three, four or more, which is not limited in this embodiment of the present application. In one embodiment, the first light combining lens may include other regions besides the transmissive regions and the reflective regions, and no light may be emitted to the other regions.

For example, as shown in the plan structure diagram of the first light combining lens shown in fig. 7, the first light combining lens 102 includes a first transmissive region 1021a, a second transmissive region 1021b, a first reflective region 1022a, and a second reflective region 1022 b. The transmissive areas and the reflective areas in the first light combining lens 102 may be alternately arranged along a second direction (e.g., the x direction in fig. 6-1), for example, the first reflective area 1022a, the second transmissive area 1021b, the second reflective area 1022b, and the first transmissive area 1021a may be sequentially arranged along the second direction. The first light combining lens 102 is tilted towards the light exit, for example, tilted at 45 degrees, so that the first transmission region 1021a can be disposed away from the converging lens assembly 105, and the first reflection region 1022a can be disposed close to the converging lens assembly 105. It should be noted that the first light combining lens 102 is disposed in an inclined manner at 45 degrees, that is, an included angle between the first light combining lens 102 and the traveling direction of the laser light emitted by the first light emitting assembly is 45 degrees. The included angle may also be other angles, and the embodiment of the present application is not limited.

In this embodiment, each transmission area in the first light combining lens 102 may correspond to a reflection area, and if light transmitted from a certain transmission area is reflected by the reflection area of the fluorescent wheel, the light may be reflected by the reflection area of the fluorescent wheel and then emitted to the reflection area corresponding to the transmission area in the first light combining lens. If the light transmitted from a certain transmission area is incident to the fluorescence area of the fluorescence wheel, the excited fluorescence is reflected by the fluorescence wheel and then at least emits to the reflection area corresponding to the transmission area in the first light combining lens. For example, referring to fig. 7, the first transmissive area 1021a of the first light combining lens 102 corresponds to the first reflective area 1022a, and the second transmissive area 1021b corresponds to the second reflective area 1022 b.

And the distance between the first transmission section 1021a and the first light emitting module 1011 may be smaller than the distance between the second transmission section 1021b and the first light emitting module 1011, and the optical path length of the laser (e.g. the first laser beam S1) from the first light emitting module 1011 to the first transmission section 1021a is shorter than the optical path length of the laser (e.g. the second laser beam S2) from the first light emitting module 1011 to the second transmission section 1021 b; the distance between the first reflective region 1022a and the fluorescent wheel 103 is smaller than the distance between the second reflective region 1022b and the fluorescent wheel 103, and the optical path of the light (e.g., the first laser beam S1 or the fluorescent light) from the fluorescent wheel 103 to the first reflective region 1022b is shorter than the optical path of the light (e.g., the second laser beam S2 or the fluorescent light) from the fluorescent wheel 103 to the first reflective region 1022 a. Since the light spot formed by the shorter optical path of the light is smaller, the light spot on the first transmission area 1021a may be smaller than the light spot on the second transmission area 1021b, and the light spot on the first reflection area 1022a may be smaller than the light spot on the second reflection area 1022 b. Furthermore, the first transmissive region 1021a only needs a small area to complete transmission of the incident laser beam, and the first reflective region 1022a only needs a small area to complete reflection of the incident laser beam, so the area of the first transmissive region 1021a can be smaller than that of the second transmissive region 1021b, and the area of the first reflective region 1022a can be smaller than that of the second reflective region 1022 b.

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

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

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

And, in the light path schematic diagrams of the light source modules shown in fig. 3 and fig. 4, the number of turning lenses 108 in the light source module may be the same as the number of transmission regions in the first light combining lens, and each turning lens in the light source module may correspond to each transmission region in the first light combining lens one to one. Each turning lens can reflect the incident laser to the corresponding transmission area. For example, referring to fig. 3 and fig. 4, in the two turning lenses 108, the turning lens close to the laser corresponds to the first transmission area 1021a of the first light combining lens 102, and the turning lens reflects the incident laser light to the first transmission area 1021 a. The turning lens far away from the laser corresponds to the second transmission area 1021b in the first light combining lens 102, and the turning lens can reflect the incident laser to the second transmission area 1021 b. In the embodiment of the present application, the position of the corresponding turning lens may be designed according to the position of each transmission area in the first light combining lens, so as to ensure that each turning lens reflects the incident laser to the corresponding transmission area.

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

in one embodiment, the first light beam and the second light beam emitted by the first light emitting element 1011 can have overlapping wavelength bands, and the first light emitting element 1011 can emit light having a wavelength band that does not overlap with the second light emitting element 1012 (i.e., the third light beam). Illustratively, the first beam of light and the second beam of light may each be blue light. For example, the wave bands of the first beam of light and the second beam of light can be 460-480 nanometers; or the wave band of the first light beam can be 450 nm to 470 nm, and the wave band of the second light beam can be 460 nm to 480 nm; or the wavelength bands of the first light and the second light may also be other wavelength bands, and the embodiment of the present application is not limited. The third light beam can be red light, and the waveband of the third light beam can be 610 nm-700 nm, or 660 nm-690 nm, or other wavebands, which is not limited in the embodiment of the application.

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

In a specific implementation, the first light emitting module and the second light emitting module may be both multi-chip Laser Diode (MCL) type lasers, the MCL type lasers may include a plurality of light emitting chips packaged in a same package and arranged in an array, and each light emitting chip may independently emit Laser light. In the embodiment of the present application, the first light beam and the second light beam may originate from the same first light emitting component, and the first light beam and the second light beam are emitted from different light emitting areas of the laser, for example, the first light beam and the second light beam may be emitted from different light emitting chips in 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.

In the first light emitting mode of the laser, the laser can emit laser light to a plurality of turning lenses 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 turning lenses simultaneously. In this case, the laser beam emitted from the laser is thicker and has higher brightness, and the laser beam is emitted to the converging lens with higher brightness after passing through the turning lens, the transmission region in the first light combining lens, the fluorescent wheel and the reflection region in the first light combining 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 turning lenses at different times. For example, the laser includes a plurality of light emitting chips, and each light emitting chip corresponds to one turning lens, and each light emitting chip can emit light to the corresponding turning lens. The light emitting chips emitting light in the laser at different time are different, so that the laser can emit laser to different turning 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 turning lens, the transmission region in the first light combining lens, the fluorescent wheel, and the reflection region in the first light combining lens. 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 device can emit laser light to different turning lenses according to the switching timing sequence of the fluorescent region and the reflective region in the fluorescent wheel, so that the laser light reflected by different turning lenses passes through the corresponding transmission regions and is emitted to different regions (such as the fluorescent region and the reflective region) of the fluorescent wheel. In an embodiment, the timing of the laser emitting light to each turning lens may also be independent of the switching timing of the fluorescent region and the reflective region in the fluorescent wheel, and the embodiment of the present application is not limited thereto.

The technical scheme of the application also provides a laser projection device, as shown in the schematic diagram of the ultra-short-focus laser projection device shown in fig. 10, the projection device projects obliquely upwards 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. 9 shows a projection optical path schematic of a laser projection apparatus. As shown in fig. 9, 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 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.

The Light valve may include a variety of structures such as LCOS, LCD or DMD, and in this example, a dlp (digital Light processing) projection structure is used, and the Light valve is referred to as a DMD chip or a 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 a light beam modulated by a light valve enters the lens and finally exits in an oblique direction, which is different from a light exit mode in which an optical axis of a projection light beam is located at a perpendicular line in a projection picture in a conventional long-focus projection, the ultra-short-focus projection lens usually has an offset of 120% to 150% relative to the projection picture, the projection mode has a smaller throw ratio (which can be understood as a ratio of a distance from a projection host to a projection screen to a size of a diagonal line of the projection picture), for example, about 0.2 or even smaller, so that the projection device and the projection screen can be closer to each other, and thus 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 picture 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 owing to use the light source subassembly in above-mentioned a plurality of embodiments, above-mentioned light source subassembly has cancelled the blue light return circuit to less optical lens and compact optics framework realize the output of at least three chromatic light, 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 structures can include heat radiation structure or circuit board.

The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter 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 relationship describing an associated object, and means that three kinds of relationships may exist, for example, at least one of a and B may mean: a exists alone, A and B exist simultaneously, and B exists alone. The term "A, B and at least one of C" means that there may be seven relationships that may mean: seven cases of A alone, B alone, C alone, A and B together, A and C together, C and B together, and A, B and C together exist. In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "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

1. A light source assembly, comprising:

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

the first beam of light and the second beam of light are respectively transmitted through different transmission areas of the first light combination lens to be emitted to the fluorescence wheel, and the fluorescence areas can be excited to respectively generate first fluorescence and second fluorescence; the first fluorescence and the second fluorescence are reflected by the fluorescence wheel and then enter different reflection areas of the first light combining lens, and are reflected to the second light combining lens by different reflection areas of the first light combining lens respectively;

the first laser beam and the second laser beam can be reflected by the reflection area of the fluorescent wheel, then enter different reflection areas of the first light combining lens, and are reflected to the second light combining lens by different reflection areas of the first light combining lens;

2. 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.

3. The light source assembly of claim 2, wherein the turning lenses are plural, and a distance from each turning lens to the light emitting surface of the first light emitting assembly is different.

4. The light source module as claimed in claim 1, wherein the first light combining lens has a first reflective region, a second reflective region and a second transmissive region disposed between the two reflective regions, one of the first laser beam and the second laser beam passes through the second transmissive region, and the other passes through one of the first reflective region and the second reflective region, which is far away from the second transmissive region, and both of the first laser beam and the second laser beam are directed to the fluorescent wheel.

5. The light source module as recited in claim 4, wherein the first and second reflective regions of the first light combining lens reflect at least green and blue light bands.

6. The light source assembly according to claim 4,

the first light combining lens is also provided with a first transmission area, and the second reflection area is arranged between the first transmission area and the second transmission area.

7. The light source assembly as recited in claim 6, wherein the first light combining lens is disposed obliquely to a wheel surface of the fluorescent wheel, the first transmission region is located at an end of the first light combining lens away from the fluorescent wheel, and the first reflection region is located at an end of the first light combining lens close to the fluorescent wheel.

8. The light source assembly of claim 6, wherein at least the first and second transmission regions of the first light combining lens are provided with an antireflection film;

and/or at least the transmission area of the first light combination lens is provided with a dichroic film, and the dichroic film is used for transmitting blue light and reflecting at least one of red light, yellow light and green light.

9. 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.

10. The light source module according to claim 1, wherein the first laser beam and the second laser beam are incident on the mirror surface of the converging mirror group at different distances from the optical axis of the converging mirror group.

11. 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.

12. 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.

13. The light source assembly according to any one of claims 1 to 12, wherein the wavelength bands of the first laser beam and the second laser beam have an overlap.

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

the light source assembly is used for emitting 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.