CN115803677A

CN115803677A - Light source assembly and projection equipment

Info

Publication number: CN115803677A
Application number: CN202180044664.6A
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: 2023-03-14
Also published as: CN113900334A; WO2021259269A1

Abstract

A light source assembly and a projection device are provided, wherein the light source assembly (10) comprises a light emitting assembly (101) which emits a first laser beam (S1) and a second laser beam (S2), the positions of the first laser beam (S1) and the second laser beam (S2) which are incident to a converging mirror group (105) are distributed on two sides of the optical axis of the converging mirror group (105) and are not symmetrical with respect to the optical axis (h) of the converging mirror group (105), so that the first laser beam (S1) and the second laser beam (S2) can excite a fluorescence area (1031) to generate first fluorescence (E1) and second fluorescence (E2) respectively, and the first fluorescence (E1) and the second fluorescence (E2) are reflected by a fluorescence wheel (103) and then incident to a first light combining part (1022 a) and a second light combining part (1022 b) respectively; and the first laser beam (S1) and the second laser beam (S2) can be reflected by the reflecting area (1032) of the fluorescence wheel (103) and are incident to the first light-combining part (1022 a) and the second light-combining part (1022 b), so that the combined light output of the laser and the fluorescence is realized. The light source component not only has a compact optical frame, but also can realize the output of higher luminous power.

Description

Light source assembly and projection equipment

Cross Reference to Related Applications

The present application claims priority from the chinese patent application having application number 202010576381.3 entitled "light source assembly and projection apparatus" filed by the chinese patent office on 22/6/2020, which 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

With the popularization and application of laser projection equipment, the requirement for equipment miniaturization is met, so that multiple aspects such as size, cost and optical efficiency need to be considered while basic illumination light beams are realized during light source product design.

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

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

the converging lens group is positioned on the front side of the fluorescent wheel and is used for converging the incident first laser beam and the incident second laser beam to the fluorescent wheel;

wherein, the positions of the first laser beam and the second laser beam incident on the converging lens group are distributed on the two sides of the optical axis of the converging lens group and are not symmetrical about the optical axis of the converging lens group,

the fluorescent area is used for generating first fluorescent light and second fluorescent light in a stimulated mode along with the rotation of the fluorescent wheel, the first fluorescent light and the second fluorescent light are reflected by the fluorescent wheel, and are respectively incident to the first light-combining part and the second light-combining part after being transmitted through the converging lens group;

the reflecting area of the fluorescence wheel is used for reflecting the first laser beam and the second laser beam, transmitting the first laser beam and the second laser beam through the converging lens group, and then respectively entering the first light-combining part and the second light-combining 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 subassembly is used for sending illuminating beam to the ray apparatus, and the ray apparatus is used for modulating the illuminating beam that the light source subassembly sent to throw to the camera lens, the camera lens is used for projecting the formation of image with the light beam through the ray apparatus modulation.

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 another schematic view of an 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 another fluorescence wheel provided in embodiments of the present application;

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

4-2 are schematic diagrams of light paths of still another light source module provided by 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;

FIG. 5-1 is a schematic view of an optical path of another light source module provided by an embodiment of the present application;

5-2 are schematic optical path diagrams of still another light source module provided by the embodiments of the present application;

fig. 6 is a schematic plan view of a light combining lens provided in an embodiment of the present application;

FIG. 7-1 is a schematic diagram of an optical path of a light emitting assembly provided in an embodiment of the present application;

FIG. 7-2 is a schematic optical path diagram of another light-emitting assembly provided in the embodiments of the present application;

FIG. 8 is a schematic optical path diagram of a projection apparatus provided in an embodiment of the present application;

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

fig. 10-1 and 10-2 are schematic structural views of a light emitting element applied to the embodiment of the present application.

Detailed Description

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

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 and fig. 2 respectively show the optical path transmission diagrams of a light source module at different times.

Fig. 1 is a schematic view illustrating a fluorescence excitation light path of a light source module according to an embodiment of the present disclosure. As shown, the light source assembly 10 may include:

at least one light emitting component 101 for emitting a first laser beam S1 and a 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 lens group 105 is located on the front side of the fluorescence wheel 103, is arranged in a light path where the first laser beam S1 and the second laser beam S2 enter the fluorescence wheel 103, and is used for converging the first laser beam S1 and the second laser beam S2 entering the fluorescence wheel 103 to form a small excitation light spot.

The positions of the first laser beam S1 and the second laser beam S2 incident on the converging lens group 105 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 of the converging lens group 105.

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

In one embodiment, the first laser light S1 and the second laser light S2 are emitted from the at least one light-emitting component 101 at the same time, and can be regarded as being used for exciting the fluorescence region at the same time.

When the fluorescence area receives the irradiation of the first laser beam S1 and the second laser beam S2, the fluorescence area can be excited to generate a first fluorescence E1 and a second fluorescence E2 respectively corresponding to the first laser beam S1 and the second laser beam S2, and the first fluorescence E1 and the second fluorescence E2 can be both reflected by the fluorescence wheel 103 and respectively incident to the first light combining part 1022a and the second light combining part 1022b after being transmitted through the converging lens assembly 105.

For example, as shown in fig. 1, the respective connecting lines between the positions of the mirror surface of the first laser beam S1 and the second laser beam S1 incident on the converging mirror group 105 and the converging position on the fluorescence wheel are different from the included angles formed by the optical axis h of the converging mirror group 105, which are the included angle α and the included angle β, and the included angles are not equal. 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. Therefore, the directions of two different laser beams incident on the surface of the fluorescence wheel after being converged by the converging lens group 105 are also different, according to the reflection principle, when the two laser beams irradiate and excite the fluorescence wheel, the fluorescence wheel is excited to generate two fluorescence beams with different emergent directions, the two fluorescence beams are also distributed on two sides of the optical axis of the converging lens group and are not symmetrical about the optical axis of the converging lens group, and thus the two different fluorescence beams can respectively irradiate to different spatial positions, namely the first light combining part 1022a and the second light combining part 1022b.

In a specific implementation, the first light combining part 1022a and the second light combining part 1022b are both disposed at an angle oblique to the wheel surface of the fluorescent wheel 103, and are parallel to each other along the same oblique angle, and the first light combining part 1022a and the second light combining part 1022b are not overlapped and have a gap therebetween. The gap is used for allowing the laser excitation light to pass through, and neither of the first light combining part 1022a and the second light combining part 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 at the same time and reflected by the fluorescence wheel 103, and as being collimated by the converging lens assembly 105, the first fluorescence E1 and the second fluorescence E2 are incident on the reflecting surfaces of the first light combining part 1022a and the second light combining part 1022b, respectively, at the same time and are reflected by the two reflecting members, and in this example, both are reflected toward the light outlet of the light source module.

Referring to fig. 3-1, a schematic view of a fluorescent wheel tread is illustrated. As shown, the fluorescent wheel 103 includes a fluorescent zone 1031 and a reflective zone 1032, wherein the fluorescent zone 1031 and the reflective zone 1032 enclose a closed loop shape, such as a ring shape; the fluorescent region 1031 and the reflective region 1032 may also be fan-shaped, so as to form a disc 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. At least one of a red fluorescent material and a yellow fluorescent material may be disposed in the fluorescent region. The fluorescent material of each color can emit fluorescent light of a corresponding color under the excitation of the laser. In one embodiment, the fluorescence that is excited may also be a laser. In this manner, the fluorescent region of the fluorescent wheel 103 can emit green, red or yellow fluorescent light under the action of the light emitted from the light emitting assembly.

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. 3-1, 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 fluorescent region and reflective region in fig. 3-1 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 red fluorescent material and can emit red light under the excitation of blue laser; the sub fluorescent region G2 includes a green fluorescent material capable of emitting green light under excitation of blue laser light. The projection device needs to project white light, and then light of various colors, which needs to be converged by the converging lens, can be mixed to obtain white light. Illustratively, white light can be obtained by mixing blue light, red light and green light in a ratio of 1. In the embodiment of the present application, the rotation speed of the fluorescent wheel can be kept unchanged, and the areas of the sub-fluorescent regions and the reflection region of the fluorescent wheel are equal, so that the ratio of the blue light, the red light and the green light emitted by the fluorescent wheel is 1. As another example, if white light can be obtained after mixing blue light, red light, and green light in a ratio of 1. In one embodiment, the number of the sub-fluorescence regions can also be four, five or other numbers; the colors of the fluorescent light emitted from the respective sub fluorescent regions may all be different, or there may be at least two sub fluorescent regions emitting fluorescent light of the same color, and the at least two sub fluorescent regions may not be adjacent.

With reference to fig. 1, a schematic diagram of a fluorescence excitation light path is shown, and it should be noted that, as the fluorescence wheel rotates, different fluorescent materials sequentially and repeatedly generate fluorescence according to a rotation timing sequence by using the same light path as that in fig. 1, and the fluorescence of different colors is reflected and collimated by referring to the path illustrated in fig. 1, and finally reflected by the first light combining part 1022a and the second light combining part 1022b. 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-reflecting 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 area and the reflecting area can be surrounded into a ring shape by designing the coating area of the fluorescent material.

In another alternative, the substrate of the fluorescent wheel may not be a reflective substrate, e.g., the substrate is a ceramic substrate on which a reflective film layer may be disposed, e.g., the reflective region of the fluorescent wheel includes a reflective coating. For example, a ring structure with a poor light reflection effect may be coated with a fluorescent material and a reflective coating to obtain a fluorescent wheel. Wherein the areas coated with the fluorescent material form 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 is described below with reference to fig. 2. As shown in fig. 2, the first laser beam S1 and the second laser beam S2 are emitted from at least one light emitting assembly 101, and the first laser beam S1 and the second laser beam S2 are two separate non-overlapping beams, and in a specific implementation, a gap is provided 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 an optical lens in a light path.

In one embodiment, there are two light emitting elements 101, which respectively emit a first laser beam S1 and a second laser beam S2.

In a specific implementation, the first laser beam S1 and the second laser beam S2 emitted by the light emitting assembly 101 may be two independent beams, or the first laser beam S1 and the second laser beam S2 may also be two partial beams of a single beam.

In one embodiment, the light emitting assembly 101 may be a single light emitting assembly, and the first laser light S1 and the second laser light S2 are emitted from different light emitting regions of the single light emitting assembly.

In a specific implementation, the light emitting assembly 101 may emit not only two light beams, but also three light beams, four light beams, or even more light beams. In this application, the first beam of laser and the second beam of laser may be two arbitrary beams of light among a plurality of beams of light emitted by the light-emitting assembly, and for the case where the 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 described in detail in this application.

As shown in fig. 2, the first laser beam S1 and the second laser beam S2 are respectively incident to different positions of the mirror surface of the converging lens group 105 on the front surface of the fluorescence wheel 103, and specifically, the positions where the two laser beams are incident to the converging lens group 105 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 of the converging lens group 105. 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 to the first light combining part 1022a and the second light combining part 1022b after being transmitted through the converging 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 the position irradiated by the first beam of laser in the converging lens group and the converging position of the first beam of laser on the fluorescence 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 laser beam in the converging lens group and the converging position of the second laser beam on the fluorescent wheel is a second connecting line, and the included angle between the second connecting line and the optical axis of the 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 focusing mirror group at different incident angles, for example, the convex surface of the first lens of the focusing mirror group, but according to the reflection principle, the respective reflection light 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 can be incident on the first light combining part 1022a and the second light combining part 1022b along different reflection light paths, respectively, 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.

In order to realize the excitation optical path shown in fig. 1 and 2, one of the first laser beam and the second laser beam may be transmitted through the gap between the first light combining part and the second light combining part, and the other may be transmitted through the first light combining part or the second light combining part away from the gap, for example, the other may be considered to be transmitted through the outer side of one of the two reflecting parts. Thus, the first light combining part and the second light combining part do not block the laser excitation light beam by arranging an interval.

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. As shown in fig. 4-1, the light source assembly 10 may further include: the beam reducing mirror group 106 is located between the light emitting element 101 and the first and second

beam combining parts

1022a and 1022b, and is configured to reduce the light spots of the first and second beams of laser light emitted from the light emitting element. The beam shrinking mirror 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 reduction mirror 106 can be a telescopic mirror, and the reduction mirror 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.

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.

With continued reference to fig. 4-1, the light source assembly 10 in the embodiments of the present disclosure 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

light combining parts

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

In one embodiment, the light-emitting surface of the light-emitting element 101 is parallel to the wheel surface of the fluorescent wheel 103, as shown in the light path in fig. 1, 2, and 4-1.

And, on the basis of the above embodiments, fig. 4-2 shows a schematic light path diagram of another light source module provided in the present application.

The difference between the schematic diagrams of the light source modules shown in fig. 1, 2, and 4-1 is that in fig. 4-2, the light emitting surface of the light emitting element 101 is perpendicular to the wheel surface of the fluorescent wheel 103, rather than parallel to each other. A turning lens 108 is further disposed along the light-emitting surface direction of the light-emitting assembly 101 for reflecting the light beams emitted by the light-emitting assembly toward the wheel surface direction of the fluorescent wheel 103, and making the distance from the position where the multiple reflected laser beams enter the mirror surface of the converging lens group 105 to the optical axis h of the converging lens group 105 different.

In an implementation, the light emitting element 101 may be an MCL-type laser 101, and a light emitting surface of the laser 101 may be perpendicular to a wheel surface or a light receiving surface of the fluorescent wheel 103.

For example, fig. 10-1 and 10-2 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. 10-1 shows an MCL laser having two rows and seven columns of light emitting chips, and fig. 10-2 shows an MCL laser having four rows and six columns of light emitting chips.

And when the light-emitting surface of the light-emitting element 101 is perpendicular to the wheel 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 101, and the turning lenses 108 are configured to reflect the light beam emitted from the laser 10 to form a plurality of light beams. The distances between the turning mirrors 108 and the light-emitting surface of the laser 101 may be different. As shown in fig. 4-2, the turning mirrors 108 may include two turning mirrors, and the two turning mirrors are respectively used for reflecting different portions of the light beam emitted from the laser 101 to form the first laser beam S1 and the second laser beam S2, and a gap is formed between the first laser beam S1 and the second laser beam S2.

In a specific implementation, if the MCL laser includes N rows or columns of light emitting chips, a turning lens is disposed in an optical path of light emitted from each N/2 rows or columns of light emitting chips, where N is an even number.

Schematically, fig. 7-1 and 7-2 show the light path turning schematic diagram of the light emitting component corresponding to the laser shown in fig. 10-1 and 10-2.

In fig. 7-1, the laser includes two rows or columns of light emitting chips, and two laser beams are emitted, and a turning lens 108 is disposed in the light emitting path corresponding to each row or column of light emitting chips.

And, as shown in fig. 7-2, the laser includes 4 rows or columns of light emitting chips, and can emit four laser beams, and a turning lens 108 is disposed in the light emitting path corresponding to every two rows or columns of light emitting chips.

After the direction of the turning lens 108 is turned, two independent laser beams are formed.

Still alternatively, the laser may only emit one laser beam, the one laser beam may be emitted to the two turning mirrors 108, each turning mirror 108 may reflect a portion of the one laser beam emitted to the turning mirror 108, and the two turning mirrors 108 may divide the one laser beam into a first laser beam S1 and a second laser beam S2.

And, the larger the distance between the two turning lenses 108 in the light emitting direction of the laser in the light source module is, the larger the distance between the two laser beams obtained by splitting the laser beam emitted by the laser 101 is. Therefore, the distance between the laser beams emitted from the turning mirrors 108 can be adjusted by adjusting the distance between the turning mirrors 108 in the light emitting direction of the laser 101.

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 a reflective surface, or only the surface of the turning lens facing the laser 101 may be a reflective surface. In the embodiment of the present application, the number of turning lenses may be an integer greater than or equal to 1, and fig. 4-2 illustrate that the light source assembly 10 includes two turning lenses, in a specific implementation, the number of 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 laser emitted by the laser. When the light source subassembly includes a plurality of turning lenses, these a plurality of turning lenses can be used for carrying out the beam splitting to the laser that the laser instrument sent, and can also adjust the distance between each bundle of laser that the beam splitting obtained through the position of adjusting each turning lens.

And, fig. 4-3 is an embodiment of a further light source module provided on the basis of the examples of fig. 4-1 and 4-2.

In the light source module diagram shown in fig. 4-3, the laser beam emitted from the laser 101 is deflected by the two deflecting mirrors 108 to form two laser beams which are emitted 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 beams of the first laser beam and the second laser beam both become thin, and are emitted to the converging mirror group 105 by avoiding the first light combining part 1022a and the second light combining part 1022b. 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 light combining part 1022a and the second light combining part 1022b, and are reflected by the two reflecting parts toward the light outlet of the light source module to form a sequential illumination light beam.

In one or more embodiments of the present disclosure, at least one light emitting component emits a first laser beam and a second laser beam, where positions of the first laser beam and the second laser beam incident on the converging lens group are distributed on two sides of an optical axis of the converging lens group and are not symmetrical with respect to the optical axis of the converging lens group, so that directions of the first laser beam and the second laser beam incident on the surface of the fluorescence wheel after being converged by the converging lens group are also different.

When the two laser beams converge on the reflection area of the fluorescent wheel, the two laser beams are reflected by the reflection area and then penetrate through the converging lens group again, and then are emitted out relative to the optical axis of the converging lens group according to the reflection principle, so that the two laser beams can also respectively enter different light-combining parts, such as a first light-combining part and a second light-combining part.

Therefore, along with the rotation time sequence of the fluorescence wheel, the first light combining part and the second light combining part can alternately receive the first laser beam, the second laser beam and the fluorescence generated by corresponding excitation, and the light source component can be ensured to output the laser beam and the fluorescence beam in time sequence.

Moreover, in the technical scheme of the application, the fluorescent wheel is provided with the laser reflection area, and compared with the related art in which the laser reflection area is arranged and then the relay loop system is required to be arranged, the light source assembly in the scheme of the application has fewer optical components and compact light path architecture, and can also take into account the miniaturization of the light source assembly while realizing higher luminous power.

And, because 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, resulting in an increase in the cost of the optical path architecture, but also the problem of heat dissipation to the fluorescence wheel due to the irradiation of the high-energy-density beam may be caused, and the fluorescence conversion efficiency is reduced instead.

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.

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 assembly 10, or a converging lens and a light collecting component are sequentially disposed to complete the collection of the fluorescence and laser beams sequentially reflected by the first light combining portion and the second light combining portion, and the fluorescence and laser beams are used as the output of the light source assembly.

In one embodiment of the present application, the first light-combining portion and the second light-combining portion are two independently disposed mirrors, and the mirrors are full-band mirrors, or mirrors reflecting a specific plurality of bands, such as red band or yellow band, green band, and blue band, which are required to be reflected.

And, as a variation of one or more of the above embodiments, in another specific implementation of the present application, the first light-combining portion and the second light-combining portion are a first reflective area and a second reflective area respectively disposed on one light-combining lens, and a second transmissive area is disposed between the second reflective area and the first reflective area, and is used for transmitting any one of the first laser beam and the second laser beam.

The other of the first laser beam and the second laser beam can transmit from the first reflection region or the second reflection region on the side far away from the second transmission region.

Or the light combining lens is also provided with a first transmission area for transmitting the other of the first laser beam and the second laser beam, and a second reflection area is arranged between the first transmission area and the second transmission area.

Fig. 5-1 is a schematic light path diagram of a light source assembly, further including a light combining lens 102, which is disposed obliquely to a wheel surface of a fluorescent wheel 103 and includes at least one transmission area, in this application example, the light combining lens 102 includes two transmission areas corresponding to a first laser beam and a second laser beam, where the first transmission area is located at an end of the light combining lens 102 far from the fluorescent wheel 103, the first reflection area is located at an end of the light combining lens 102 close to the fluorescent wheel 103, and the second transmission area and the second reflection area are located between the first reflection area and the first transmission area.

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. 5-1, 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 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 group 105 through different transmission regions of the light combining lens 102, and then are converged by the converging lens group 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 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 light combining lens 102, and the different reflective regions of the 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 by the fluorescence area being excited may be referred to as an excited laser beam. In one embodiment, the light exit direction (e.g., x direction in fig. 1) of the light source module 10 may be perpendicular to the arrangement direction (i.e., y direction) of the 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 light combining lens 102, and the different reflection areas of the light combining lens 102 reflect the first laser beam S1 and the second laser beam S2 toward the light outlet. As shown in fig. 5-1, the first laser beam S1 is reflected by the reflection area of the fluorescence wheel 103 and then transmitted through the converging lens assembly 105 again, and then enters the first reflection area 1022a of the light combining lens 102; the second laser beam S2 is reflected by the reflective region of the fluorescent wheel 103 and transmitted through the converging mirror group 105 again, and then enters the second reflective region 1022b of the light combining lens 102.

Wherein, the transmission area or the reflection area of the light combining lens 102 are arranged at intervals. For example, the transmissive and reflective regions of the combiner lens 102 may alternate. As in fig. 5-1 or 6, a second reflective region 1022b is spaced between the first transmissive region 1012a and the second transmissive region 1012b, and a second transmissive region 1012b is spaced between the first reflective region 1022a and the second reflective region 1022b.

The transmission area in the light combining lens 102 can transmit light (such as a first laser beam and a second laser beam) emitted by the light emitting assembly 101, and the reflection area in the light combining lens 102 can reflect 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.

In one implementation, as shown in fig. 5-1, the converging lens group 105 may include at least one convex lens, and the convex arc surface of each convex lens faces the light combining lens 102.

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 lens group 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.

In one embodiment, as shown in FIG. 5-1, the fluorescence wheel 103 can rotate about the rotation axis Z, such that the laser light (e.g., including the first laser beam and the second laser beam) transmitted from the light combining lens 102 to the fluorescence wheel 103 is switched between the fluorescence area and the reflection area.

In one embodiment, the fluorescent wheel 103 may have a disc shape, the plane of the disc may intersect the first direction, and the rotation axis Z may pass through the center of the circular ring and be perpendicular to the plane of the disc. The fluorescent region of the fluorescent wheel 103 is used for emitting fluorescent light with a color different from that of the laser light under the excitation of the incident laser light; the reflecting region of the fluorescent wheel 103 is used for reflecting the incident laser light. In one embodiment, the fluorescent region can emit fluorescence in all directions under the excitation of the laser, for example, the light emitting angle of the fluorescent region can be 180 degrees, or other angles less than 180 degrees.

In this embodiment, after the first laser beam and the second laser beam pass through the light combining lens 102 and are emitted to the reflection area of the fluorescent wheel 103, the reflection area of the fluorescent wheel 103 may reflect the first laser beam and the second laser beam to different reflection areas in the light combining lens 102, and then the different reflection areas in the light combining lens 102 may reflect the first laser beam and the second laser beam to the light outlet. After the first beam of laser and the second beam of laser penetrate through the light combining lens 102 and emit to the fluorescence area of the fluorescence wheel 103, the fluorescence area can emit fluorescence under excitation of the first beam of laser and the second beam of laser, and emit the fluorescence to the reflection area in the light combining lens 102, and then the reflection area in the light combining lens 102 can reflect the fluorescence to the light outlet of the light source component.

It should be noted that, in fig. 5-1, the transmission process of the light is illustrated only by the case that the first laser beam and the second laser beam emitted by the light emitting assembly 101 respectively transmit through the first transmission region 1021a and the second transmission region 1021b of the light combining lens 102 and further emit to the reflection region of the fluorescence 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 light combining lens 102, such as the first reflective region 1022a to which the first laser beam is directed and the second reflective region 1022b to which the second laser beam is directed.

In one implementation, for the case that the light emitted from the 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 and the transmission area of the lens assembly 102, and the light transmission process in this case is not illustrated in the embodiment of the present application.

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

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

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

And, fig. 5-2 shows a schematic view of the light path of another light source module, based on the embodiment of the light source module shown in fig. 5-1. Unlike the example of fig. 5-1, the turning lens 108 is further disposed in the light exit path of the light emitting element 101 in fig. 5-2, and the light source assembly further includes the beam reduction lens group 106, and may further include the third lens 107, for the relationship between the light emitting element and the turning lens, and the functions of the beam reduction lens group 106 and the third lens 107 in the light path, reference may be made to the descriptions in fig. 4-1, fig. 4-2, and fig. 4-3, and no further description is provided herein. Unlike fig. 4-1, 4-2 and 4-3, the first laser beam and the second laser beam are homogenized by the beam reduction mirror 106 or the third mirror 107, and then specifically enter the transmission regions of the light combining mirror 102, such as the first transmission region and the second transmission region, and then enter the converging mirror 105 after being transmitted by the first transmission region and the second transmission region.

For example, with continuing reference to fig. 5-1 and fig. 5-2, the first transmission region 1021a is located at an end of the light combining lens 102 far from the fluorescent wheel 103, and the first reflection region 1022a is located at an end of the light combining lens 102 near 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 emitted from the light emitting assembly 101, the laser 101 may emit laser light to the turning mirror 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 1022b. When the fluorescent area on the fluorescent wheel 103 is located in the irradiation area of the laser emitted from the light emitting component 101, the laser 101 can emit 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 fluorescent light from the fluorescent wheel 103 to the first reflection area 1022a is short, the light spot formed by the fluorescent light on the first reflection area 1022a is small, the light beam of the fluorescent light is thin, and the first reflection area 1022a easily reflects all the fluorescent light to the light outlet of the light source module.

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

in one embodiment, the light combining lens 102 may be disposed obliquely to the traveling direction of the first laser beam and the second laser beam emitted by the light emitting assembly, that is, an included angle exists between the light combining lens 102 and the traveling direction. If the traveling direction of the first laser beam and the second laser beam is the arrangement direction of the light combining lens 102, the converging lens group 105 and the fluorescence wheel 103 (i.e. the y direction in fig. 5-1), the light combining lens 102 may be inclined with respect to the y direction. For example, the light combining lens 102 can be tilted toward the light outlet. Alternatively, the light combining lens 102 is disposed to be inclined at 45 degrees with respect to the wheel surface of the fluorescent wheel 103.

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

For example, as shown in the plan structure diagrams of the light combining lens of fig. 5-1, 5-2 and 6, the light combining lens 102 includes a first transmissive region 1021a, a second transmissive region 1021b, a first reflective region 1022a and a second reflective region 1022b. The transmissive areas and the reflective areas in the light combining lens 102 may be alternately arranged along a second direction (e.g., the x direction in fig. 5-1), 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 light combining lens 102 is tilted toward the light exit, for example, tilted by 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 light combining lens 102 is disposed in an inclined manner at 45 degrees, that is, an included angle between the light combining lens 102 and a traveling direction of the laser light emitted by the light emitting assembly is 45 degrees. The included angle may also be other angles, and the embodiment of the present application is not limited.

In this embodiment, each transmission area in the light combining lens 102 may correspond to a reflection area, and if light transmitted from a certain transmission area is reflected by the reflection area of the fluorescent wheel, the light may be reflected by the reflection area of the fluorescent wheel and then emitted to the reflection area corresponding to the transmission area in the light combining lens. If the light transmitted from a certain transmission area 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 light combining lens. For example, with reference to fig. 6, a first transmission area 1021a of the light combining lens 102 corresponds to the first reflection area 1022a, and a second transmission area 1021b corresponds to the second reflection area 1022b.

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

With reference to fig. 5-1 and fig. 5-2, the distance between the first transmission area 1021a and the light emitting device 101 may be smaller than the distance between the second transmission area 1021b and the light emitting device 101, and the optical path of the laser (e.g., the first laser beam S1) from the light emitting device 101 to the first transmission area 1021a is shorter than the optical path of the laser (e.g., the second laser beam S2) from the light emitting device 101 to the second transmission area 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 light S1 or the fluorescent light) from the fluorescent wheel 103 to the first reflective region 1022b is shorter than the optical path of the light (e.g., the second laser light S2 or the fluorescent light) from the fluorescent wheel 103 to the first reflective region 1022 a. Since the light spot formed by the shorter optical path of the light is smaller, the light spot on the first transmission region 1021a may be smaller than the light spot on the second transmission region 1021b, and the light spot on the first reflection region 1022a may be smaller than the light spot on the second reflection region 1022b. 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 1022b.

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

In an alternative manner, functional film layers may be disposed on different areas of the transparent substrate to obtain a light combining lens. For example, for the reflective area, the reflective area of the light combining lens 102 may have a coating. The coating film can be a full-wave band reflecting film, or the coating film is a reflecting film aiming at least one wave band of a red light wave band, a green light wave band and a blue light wave band. The coating may be located on a side of the light combining lens 102 close to the converging lens group 105, or on a side of the 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 light combining lens 102 is disposed on the side close to the converging lens group 105, and a dichroic film is disposed on at least the 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 light combining lens 102 includes red light, and even if the fluorescent light is emitted to the transmission area, the fluorescent light will be reflected by the dichroic film and further emitted to the light outlet of the light source module on the basis that the dichroic film is disposed on the surface of the transmission area of the light combining lens 102, so that the utilization rate of the fluorescent light is improved.

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

In one embodiment, an anti-reflection film is disposed on a side of the light combining lens 102 away from the converging lens group 105; or, an antireflection film is disposed in the transmission region on the side of the 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 schematic light path diagram of the light source module shown in fig. 5-2, the number of turning lenses 108 in the light source module may be the same as the number of transmission regions in the light combining lens, and each turning lens in the light source module may correspond to each transmission region in the light combining lens one to one. Each turning lens can reflect the incident laser to the corresponding transmission area. For example, referring to fig. 5-2, of the two turning lenses 108, the turning lens close to the laser corresponds to the first transmission area 1021a of the light combining lens 102, and the turning lens reflects the incident laser light to the first transmission area 1021a. The turning lens far away from the laser corresponds to the second transmission area 1021b in the light combining lens 102, and the turning lens can reflect the incident laser to the second transmission area 1021b. In the embodiment of the application, the position of the corresponding turning lens can be designed according to the position of each transmission area in the light combining lens, so that each turning lens can reflect the incident laser to the corresponding transmission area.

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

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

And, based on the light source module structures of the above embodiments, the light emitting module is described with reference to the accompanying drawings:

in one implementation, the first laser and the second laser emitted by the light emitting assembly 101 may have 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 nm, and the wave band of the second beam of laser can be 420-450 nm; 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.

The first laser beam and the second laser beam in the embodiment of the present application may originate from the same light emitting assembly, or the first laser beam and the second laser beam may also originate from different light emitting assemblies, which is not limited in the embodiment of the present application. The light emitting component may be a multi-chip Laser Diode (MCL) type Laser, and the MCL type Laser may include a plurality of light emitting chips packaged in the same package and arranged in an array, and each light emitting chip may independently emit Laser light. The first 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 can be emitted from different light emitting chips in the laser.

With continued reference to fig. 1, 2, 4-1, and 5-1, the light emitting surface of the laser 101 and the wheel surface or the light receiving surface of the fluorescent wheel 103 may be parallel to each other.

The laser 101, the light combining lens 102 or the first light combining part 1022a, the second light combining part 1022b, the converging lens group 105 and the fluorescent wheel 103 are sequentially arranged along the light emitting direction of the laser 101, for example, the laser can directly emit laser to the transmission region of the light combining lens 102.

In one implementation, the laser 101 can emit a laser beam that can be directed to each transmissive region of the combiner lens 102. Alternatively, the laser 101 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 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 thick, the brightness of the laser is high, and the laser beam is also high when it is emitted to the condenser lens after passing through the turning mirror, the transmission region in the light combining mirror, the fluorescent wheel, and the reflection region in the light combining mirror. Therefore, the converging lens can use the light with higher brightness for projection of the projection equipment, so that the brightness of the image obtained by projection of the projection equipment is higher, and the projection effect of the projection equipment is better.

In a second 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 it is emitted to the condensing lens after passing through the turning 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. Because the light emitting chip in the laser does not need to continuously emit light under the condition, the pulse current can be adopted to supply 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 to different turning lenses according to the switching timing sequence of the fluorescent area and the reflective area in the fluorescent wheel, so that the laser reflected by different turning lenses passes through the transmission area in the corresponding light combining lens and is emitted to different areas (such as the fluorescent area and the reflective area) of the fluorescent wheel. In one embodiment, the timing of the light emitted from the laser to each turning mirror can be independent of the switching timing of the fluorescent region and the reflective region in the fluorescent wheel.

And, in one implementation, the first laser beam and the second laser beam emitted by the light emitting assembly 101 have different colors and are emitted by the light emitting assembly 101 in a time sequence. Still referring to the schematic optical path diagram of fig. 2, for example, one of the first laser beam and the second laser beam is a blue laser, and the other is a red laser. The blue laser can be used as an excitation light source and can also be used as a blue primary color light source. The red laser is used as a red primary color light source. However, unlike when both beams are blue lasers, the wheel surface structure of the fluorescent wheel has changed, specifically, another fluorescent wheel is shown in a schematic plan view in fig. 3-2.

As shown in fig. 3-2, the fluorescent wheel 103 includes a fluorescent zone 1031 and a reflective zone 1032, wherein the fluorescent zone 1031 may include at least green phosphor and may also include yellow phosphor. And reflective region 1032 may be divided into a blue reflective region 1032a and a red reflective region 1032b.

According to the above arrangement, the irradiation region of blue laser light includes the fluorescent region 1031 and the blue light reflection region 1032a, and the irradiation region of red laser light includes the red light reflection region 1032b.

Therefore, as the fluorescent wheel 103 rotates, green fluorescence (or green and yellow fluorescence), blue laser, and red laser can be emitted in a time sequence, and light beams of three primary colors or four primary colors are all reflected by the first light-combining part and the second light-combining part to be emitted to the light-emitting port of the light source assembly, so that light combination is completed.

In one embodiment, the red reflecting region 1032b may further include a scattering material, which reflects the red laser light and scatters the red laser light, so as to improve the speckle-dispersing effect of the red laser light.

The transmission of the light emitted by the light emitting assembly and the relationship between the condensing lens and the light combining lens will be described with reference to the accompanying drawings:

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

In one embodiment, the first laser beam and the second laser beam emitted by the light emitting assembly can be incident on different mirror positions of the converging mirror group. In one embodiment, the positions of the mirror surfaces of the first laser beam and the second laser beam incident on the converging mirror group are not symmetrical with respect to the optical axis of the converging mirror group. Therefore, the situation that the first laser beam is reflected to the transmission area, into which the second laser beam enters, by the reflection area when the first laser beam is converged to the reflection area of the fluorescent wheel can be avoided.

In one embodiment, the first laser beam and the second laser beam are incident on the mirror surface of the converging mirror group, and the respective connecting lines of the converging positions on the fluorescent wheel and the optical axis of the converging mirror group form different included angles. 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, a first included angle formed by the first laser beam S1 and the optical axis h of the focusing lens assembly 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 assembly 102 is an angle β, and α > β. Therefore, 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 light paths of the first laser beam and the second laser beam will not overlap. The first finger lens refers to a lens close to the light combining lens in the converging lens group.

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

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

It should be noted that, for the case that the laser in the light emitting assembly emits light to each turning lens at the same time, reference may be made to the introduction that the light emitting assembly emits laser to different turning lenses according to the switching timing sequence of the fluorescence area and the reflection area in the fluorescence wheel, and this embodiment is not described again.

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

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

The technical scheme of the application also provides a laser projection device, and as shown in a schematic diagram of an ultra-short-focus laser projection device in fig. 9, the projection device projects obliquely upwards to an optical screen for imaging, the projection device is closer to a plane where the optical screen is located, and large-size projection display can be realized with a smaller projection ratio.

And, FIG. 8 shows a projection light path schematic of a laser projection device. As shown in fig. 8, 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.

Light source assembly 100 also includes a plurality of optical lenses that combine and converge the laser and fluorescent light beams.

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, depending on the projection structure, 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 Digital micromirror array. Before the light beam of the light source 100 reaches the light valve DMD, the illumination light path of the optical 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 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 "at least one of a, B and C" means that there may be seven relationships that may represent: there are seven cases of A alone, B alone, C alone, A and B together, A and C together, C and B together, and A, B and C together. In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless 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 light-emitting assembly is used for emitting a first laser beam and a second laser beam;

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

the converging mirror group is positioned on the front surface of the fluorescent wheel and is used for converging the incident first laser beam and the incident second laser beam to the fluorescent wheel;

wherein the positions of the first laser beam and the second laser beam incident on the converging lens group 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 fluorescent area is used for being excited to generate first fluorescent light and second fluorescent light along with the rotation of the fluorescent wheel, and the first fluorescent light and the second fluorescent light are both reflected by the fluorescent wheel and are respectively incident to the first light-combining part and the second light-combining part after being transmitted through the converging lens group;

and the reflecting area of the fluorescence wheel is used for reflecting and transmitting the first laser beam and the second laser beam through the converging mirror group and then respectively entering the first light-combining part and the second light-combining part.
The light source module as recited in claim 1, wherein the number of the light emitting assemblies is two, and the first laser beam and the second laser beam are emitted respectively.
The light source module as recited in claim 1, wherein the light emitting assembly comprises one, and the first laser beam and the second laser beam are emitted from different light emitting areas of the one light emitting assembly.
The light source assembly according to claim 2 or 3, wherein the light emitting surface of the light emitting assembly is parallel to the wheel surface of the fluorescent wheel, and a gap is formed between the first laser beam and the second laser beam.
The light source assembly according to claim 2 or 3, wherein a light-emitting surface of the light-emitting assembly is perpendicular to a wheel surface of the fluorescent wheel, and a turning lens is further disposed along the light-emitting surface of the light-emitting assembly,

the turning lens enables the distances from the positions of the laser beams after being reflected to the mirror surface of the converging mirror group to the optical axis of the converging mirror group to be different.
The light source assembly according to claim 5, wherein the light emitting assembly is an MCL laser, the MCL laser includes N rows or columns of light emitting chips, and one turning lens is disposed in an optical path of light emitted from every N/2 rows or columns of light emitting chips, where N is an even number.
The light source module according to claim 1, wherein the first laser beam and the second laser beam have overlapping wavelength bands and are the same color.
The light source assembly of claim 7, wherein the first laser and the second laser are emitted simultaneously by the light emitting assembly.
The light source assembly of claim 1, wherein the first laser beam and the second laser beam are of different colors.
The light source assembly of claim 9, wherein the first laser light and the second laser light are emitted by the light emitting assembly in a time sequence.
The light source assembly according to claim 1, wherein the first light combining part and the second light combining part are arranged in parallel with a space therebetween.
The light source module according to claim 1, wherein the first light-combining portion and the second light-combining portion are a first reflective area and a second reflective area respectively disposed on one light-combining lens, and a second transmissive area is disposed between the second reflective area and the first reflective area, and the second transmissive area is configured to transmit either one of the first laser beam and the second laser beam;

the light combining lens is also provided with a first transmission area which is used for transmitting the other one of the first laser beam and the second laser beam; the second reflective region is disposed between the first transmissive region and the second transmissive region.
A projection device, characterized in that the projection device comprises: the light source module of any one of claims 1 to 12, and an optical engine 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.