Laser, projection light source and projection equipment

Abstract

A laser (10), a projection light source and a projection apparatus. The laser (10) comprises a base plate (101), a first light emitting chip (103a) and a reflection assembly (104). The first light-emitting chips (103a) are located on the bottom plate (101), and each first light-emitting chip (103a) is provided with a corresponding reflection assembly (104); the first light-emitting chip (103a) is configured to emit laser to the reflection assembly (104), and the reflection assembly (104) is configured to reflect the received laser in a target direction and perform shaping processing on the laser in the reflection process. The divergence angle and the light spot width of the laser output by the laser (10) on the fast and slow axis are optimized, and the beam quality of the laser emitted by the laser (10) is improved; the laser (10) is simple in structure and small in size, and miniaturization development of the laser (10) is facilitated.

Description

Lasers, projection light sources and projection equipment

[0001] This application claims priority to Chinese patent application number 202211588657.5 filed on December 9, 2022, and application name “Laser, projection light source and projection equipment”, as well as priority to Chinese patent application number 202310112842.5 filed on February 13, 2023, and application name “Laser, projection light source and projection equipment”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of optoelectronic technology, and in particular to a laser, a projection light source, and a projection device. Background Art

[0003] With the development of optoelectronic technology, lasers are increasingly used, such as in projection equipment as light sources. Currently, there is an increasing demand for miniaturization of projection equipment, which in turn requires lasers to be smaller in size.

[0004] Public content

[0005] In one aspect, the present application provides a laser, wherein the laser comprises: a base plate, a first light-emitting chip, and a reflective component;

[0006] The first light-emitting chips are located on the bottom plate, and each of the first light-emitting chips has a corresponding reflective component;

[0007] The first light-emitting chip is configured to emit laser light toward the reflective component, and the reflective component is configured to reflect the received laser light along a target direction and perform shaping processing on the laser light during the reflection process.

[0008] In the laser provided in the embodiment of the present application, the first light-emitting chip is located on the base plate, and a reflective component is used to reflect the laser emitted by the first light-emitting chip toward the target direction, and a shaping process is performed during the laser reflection process to optimize the emission angle and spot width of the laser output by the laser on the fast and slow axes, thereby improving the beam quality of the laser emitted by the laser; the laser has a simple structure and a small size, which is conducive to the miniaturization development of the laser.

[0009] On the other hand, the present application provides a projection light source, wherein the projection light source includes the laser described in the present application.

[0010] In another aspect, the present application provides a projection device, wherein the projection device includes the projection light source described in the present application, as well as a light valve and a lens;

[0011] The light valve is configured to modulate the laser light emitted by the projection light source and then emit it toward the lens, and the lens is configured to project the received laser light to form a projection image. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] FIG1 is a schematic structural diagram of a laser provided in Example 1 of the present application;

[0013] FIG2 is a schematic structural diagram of a laser provided in Example 2 of the present application;

[0014] FIG3 is a schematic structural diagram of a laser provided in Example 3 of the present application;

[0015] FIG4 is a schematic diagram of a light spot formed by a laser in front of a first reflective component provided in an embodiment of the present application;

[0016] FIG5 is a schematic diagram of a light spot formed by a laser behind a second reflective component provided in an embodiment of the present application;

[0017] FIG6 is a schematic diagram of the arrangement positions of the first reflective component and the second reflective component provided in an embodiment of the present application;

[0018] FIG7 is a schematic diagram of the side and bottom surfaces of a right-angled trapezoidal reflective prism provided in an embodiment of the present application;

[0019] FIG8 is a schematic structural diagram of a stepped reflector provided in an embodiment of the present application;

[0020] FIG9 is a schematic structural diagram of a laser provided in Example 4 of the present application;

[0021] FIG10 is a schematic structural diagram of a laser provided in Example 5 of the present application;

[0022] FIG11 is a schematic structural diagram of a laser provided in Example 6 of the present application;

[0023] FIG12 is a schematic structural diagram of a laser provided in Example 7 of the present application;

[0024] FIG13 is a schematic structural diagram of a laser provided in Example 8 of the present application;

[0025] FIG14 is a schematic structural diagram of a laser provided in Example 9 of the present application;

[0026] FIG15 is a schematic structural diagram of a laser provided in Example 10 of the present application;

[0027] FIG16 is a schematic structural diagram of a laser provided in Example 11 of the present application;

[0028] FIG17 is a schematic structural diagram of a laser provided in Example 12 of the present application;

[0029] FIG18 is a schematic structural diagram of a laser provided in Example 13 of the present application;

[0030] FIG19 is a schematic structural diagram of a laser provided in Example 14 of the present application;

[0031] FIG20 is a schematic structural diagram of a projection light source provided in Example 15 of the present application;

[0032] FIG21 is a schematic structural diagram of a projection light source provided in Example 16 of the present application. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application will be further described below with reference to the accompanying drawings and examples. However, the example embodiments can be implemented in various forms and should not be understood as being limited to the embodiments set forth herein; on the contrary, these embodiments are provided to make the present application more comprehensive and complete, and to fully convey the concepts of the example embodiments to those skilled in the art. The same figure marks in the figures represent the same or similar structures, and their repeated descriptions will be omitted. The words expressing position and direction described in this application are all explained using the accompanying drawings as examples, but changes can be made as needed, and all changes are included in the scope of protection of this application. The drawings in this application are only used to illustrate relative position relationships and do not represent true proportions.

[0034] With the development of optoelectronic technology, the application of lasers is becoming more and more extensive. For example, lasers can be used as the light source in laser projection equipment. The laser light emitted by the laser can form a projection image with better display effect. Currently, various electronic products (including projection equipment) are gradually developing towards miniaturization, portability and multi-functionality. Correspondingly, the requirements for miniaturization and light-emitting performance of lasers are also becoming higher and higher.

[0035] A laser may include multiple light-emitting chips. Due to the structural characteristics of the active layer of the light-emitting chip itself, the beam quality of the output light beam on the fast and slow axes varies greatly and cannot be used directly. The beam quality can be characterized by the beam parameter product (BPP). The beam parameter product in a certain direction is the product of the spot width and the divergence angle of the light beam in that direction. For example, a row of light-emitting chips in a laser includes three light-emitting chips. The spot length of the laser emitted by this row of light-emitting chips on the fast axis is 0.002 mm, the divergence angle is 23.25 degrees, and the BPP on the fast axis is 0.8 mm × mrad; the overall spot length of the laser emitted by this row of light-emitting chips on the slow axis is 2.75 mm, the divergence angle is 5 degrees, and the BPP on the slow axis is 240 mm × mrad. It can be seen that the BPP on the slow axis is 300 times that of the fast axis, the beam energy is seriously unbalanced, and the beam quality is poor.

[0036] In the related art, the laser light emitted by the light-emitting chip in the laser can also pass through a collimator to collimate the laser light on the fast axis. After the laser light emitted by the laser passes through the collimator, the optical parameter product on the fast axis is still smaller than the optical parameter product on the slow axis. In the related art, in order to improve the quality of the light beam, the light beam is also shaped and homogenized. The light emitted by the laser first passes through a light-combining mirror group composed of multiple reflectors for light combination. Since the laser light emitted by the laser is not collimated on the slow axis, the light spot will gradually increase with the increase of the optical path distance and may exceed the size range of the optical element. Therefore, a set of beam collimation system needs to be added after the reflector group to collimate the laser light on the slow axis. Finally, the laser light is shaped using components such as a compound eye lens or a diffuser. Although the combination of these optical components with different functions can achieve the purpose of improving the quality of the light beam, it will cause the volume of the light source to be larger, and the improvement of the laser quality is more complicated.

[0037] The following embodiments of the present application provide a laser, a projection light source and a projection device. The laser beam emitted by the laser has good quality and can be smaller in size. The volume of the projection light source can also be smaller, which is conducive to the miniaturization of the projection device and the improvement of the display effect of the projection picture.

[0038] Figure 1 is a schematic diagram of the structure of a laser provided in Example 1 of the present application, and Figure 12 is a schematic diagram of the structure of a laser provided in Example 7 of the present application. As shown in Figures 1 and 12, in some embodiments, the laser 10 includes: a base plate 101, first light-emitting chips 103a, and a reflective assembly 104; the first light-emitting chips 103a are located on the base plate 101, and each first light-emitting chip 103a has a corresponding reflective assembly 104; the first light-emitting chips 103a are configured to emit laser light toward the reflective assembly 104, and the reflective assembly 104 is configured to reflect the received laser light in a target direction and perform shaping processing on the laser light during the reflection process.

[0039] In the laser provided in this embodiment, the first light-emitting chip 103a is located on the base plate 101, and a reflective component 104 is used to reflect the laser emitted by the first light-emitting chip 103a toward the target direction. A shaping process is performed during the laser reflection process to optimize the emission angle and spot width of the laser output on the fast and slow axes, thereby improving the beam quality of the laser emitted by the laser. The laser has a simple structure and a small size, which is conducive to the miniaturization development of the laser.

[0040] In some possible implementations, the reflective component 104 includes, but is not limited to, a emitting prism, a plane reflector, a curved reflector (e.g., a convex reflector, a concave reflector), etc. Alternatively, the reflective component 104 may include at least one reflector, which may be a spherical reflector or an aspherical reflector.

[0041] The shaping of the laser beam by the reflective assembly 104 includes, but is not limited to, shaping optical parameters or optical characteristics such as the divergence angle of the laser beam on the fast axis, the spot width on the fast axis, the divergence angle of the laser beam on the slow axis, the spot width on the slow axis, etc. For example, the divergence angle of the laser beam on the fast axis may be reduced or increased, the spot width of the laser beam on the fast axis may be reduced or increased, the divergence angle of the laser beam on the slow axis may be reduced or increased, the spot width of the laser beam on the slow axis may be reduced or increased, etc.

[0042] As shown in Figures 1 to 3, in some embodiments, the reflective component 104 includes a first reflective component 1041 and a second reflective component 1042; the first reflective component 1041 is located on the base plate 101, and the second reflective component 1042 is located on the side of the first reflective component 1041 away from the base plate 101, and the first reflective component 1041 and the second reflective component 1042 both correspond to the first light-emitting chip 103a; the first reflective component 1041 is configured to emit the received laser in a direction away from the base plate 101 toward the second reflective component 1042, and the second reflective component 1042 is configured to reflect the received laser in a target direction, the target direction is parallel to the board surface of the base plate 101, and the target direction is perpendicular to the light emitting direction of the first light-emitting chip 103a.

[0043] Through the above arrangement, the laser beam can be emitted twice using the first reflecting component 1041 and the second reflecting component 1042, which not only changes the light-emitting direction of the laser beam so that it is emitted along the target direction, but also can adjust the reflecting surfaces in the first reflecting component 1041 and the second reflecting component 1042 to achieve the shaping of the laser beam.

[0044] As shown in Figures 1 to 3, in some embodiments, the laser 10 further includes a first collimating lens 105; the first collimating lens 105 is located on the base plate 101, the first collimating lens 105 corresponds to the first light-emitting chip 103a of the light-emitting chip, and the first collimating lens 105 is located between the first light-emitting chip 103a of the light-emitting chip and the first reflective component 1041; the first light-emitting chip 103a of the light-emitting chip is configured to emit laser light toward the first collimating lens 105, and the first collimating lens 105 is configured to reduce the divergence angle of the received laser light on the fast axis and then emit it toward the first reflective component 1041; the divergence angle of the laser light emitted to the first reflective component 1041 on the fast axis is smaller than the divergence angle on the slow axis.

[0045] By using the first collimating lens 105, the fast-axis divergence angle of the laser beam emitted by the first emitting chip can be reduced, so that the spot of the laser beam is reduced, so that subsequent optical elements (such as the first reflecting component 1041 and the second reflecting component 1042) only need a smaller size to receive and adjust the laser, which is conducive to the miniaturization of the laser 10.

[0046] As shown in Figures 1 to 3, in some embodiments, there are multiple first light-emitting chips 103a, and the multiple first light-emitting chips 103a have the same light-emitting direction. The multiple first light-emitting chips 103a are arranged along an arrangement direction that is perpendicular to the light-emitting direction of the first light-emitting chips 103a. In Figure 1, the y direction represents this arrangement direction.

[0047] As shown in Figures 1 to 3, in some embodiments, the laser 10 includes: a base plate 101, a first light-emitting chip 103a, a first collimating lens 105, and a first reflective component 1041 located on the base plate, and a second reflective component 1042 located on a side of the first reflective component 1041 away from the base plate 101. Exemplarily, the base plate 101 is generally a plate-like structure having two opposing, larger surfaces and a plurality of smaller side surfaces connecting the two surfaces, and the two surfaces may be parallel. The first light-emitting chip 103a, the first collimating lens 105, and the first reflective component 1041 are all located on one surface of the base plate 101.

[0048] The number of first light-emitting chips 103a can be one or more. FIG1 illustrates a laser device including three first light-emitting chips 103a arranged in a row along the y-direction. The row direction of the first light-emitting chips 103a is parallel to the y-direction. The adjacent direction of the three first light-emitting chips 103a is the aforementioned arrangement direction.

[0049] Each first light-emitting chip 103a has a corresponding first collimating lens 105, a first reflecting component 1041, and a second reflecting component 1042. The number of first collimating lenses 105, first reflecting components 1041, and second reflecting components 1042 can be the same as the number of first light-emitting chips 103a. Each first light-emitting chip 103a corresponds to one first collimating lens 105, one first reflecting component 1041, and one second reflecting component 1042. Each first light-emitting chip 103a and any two of its corresponding first collimating lens 105, first reflecting component 1041, and second reflecting component 1042 correspond to each other. For example, the first collimating lens 105 also corresponds to the first reflecting component 1041, and the first reflecting component 1041 also corresponds to the second reflecting component 1042. Each first light-emitting chip 103a may also correspond to multiple first reflective components 1041 and multiple second reflective components 1042, and the number of first reflective components 1041 is the same as the number of second reflective components 1042; or multiple first light-emitting chips 103a may correspond to one first reflective component 1041 and one second reflective component 1042, which is not limited in the embodiment of the present application.

[0050] Each first light-emitting chip 103a and its corresponding first collimating lens 105 and first reflective component 1041 can be arranged in sequence along a direction (such as the x-direction in FIG. 1 ), where the x-direction is the light-emitting direction of the first light-emitting chip 103a, and the x-direction is perpendicular to the y-direction. For example, the first reflective component 1041 and the second reflective component 1042 both have reflective surfaces, and the reflective surfaces are used to reflect the laser light, with the reflective surface of the first reflective component 1041 facing the reflective surface of the corresponding second reflective component 1042. On the base plate 101, the orthographic projection of the reflective surface of each second reflective component 1042 at least partially overlaps with the orthographic projection of the reflective surface of the corresponding first reflective component 1041, so as to ensure that the laser light can be transmitted between the areas corresponding to the overlapping orthographic projections of the first reflective component 1041 and the second reflective component 1042, and to ensure that the light reflected by the reflective surface of the first reflective component 1041 can be directed toward the reflective surface of the second reflective component 1042. Figures 1 to 3 all take the example of the orthographic projection of the reflective surface of the second reflective component 1042 partially overlapping with the orthographic projection of the reflective surface of the corresponding first reflective component 1041 on the bottom plate 101. The orthographic projection of the reflective surface of the second reflective component 1042 may also completely overlap with the orthographic projection of the reflective surface of the corresponding first reflective component 1041, which is not limited in this embodiment of the present application.

[0051] Each first light-emitting chip 103a is configured to emit a laser toward the corresponding first collimating lens 105. The divergence angle of the laser emitted by the first light-emitting chip 103a in the direction perpendicular to the chip surface (such as parallel to the z direction) is large, and this direction can be called the fast axis of the laser; the divergence angle in the direction parallel to the chip surface (such as parallel to the y direction) is small, and this direction can be called the slow axis of the laser. The first collimating lens 105 is configured to collimate the received laser on the fast axis and then direct it toward the corresponding first reflecting component 1041. Collimating the laser on the fast axis means reducing the divergence angle of the laser on the fast axis. The divergence angle of the laser on the fast axis after passing through the first collimating lens 105 can be smaller than the divergence angle on the slow axis. The first reflecting component 1041 and the second reflecting component 1042 can then be used to achieve a balance in the optical parameter product of the laser on the fast axis and the slow axis. In the embodiment of the present application, the laser light emitted by the first light-emitting chip 103a first passes through the first collimating lens 105 to reduce the divergence angle on the fast axis. This can reduce the spot size of the laser light emitted from the first collimating lens 105. Accordingly, subsequent optical components (such as the first reflective component 1041 and the second reflective component 1042) only need to be smaller in size to receive and adjust the laser light, which facilitates the miniaturization of the laser 10.

[0052] Laser light emitted from the first collimating lens 105 can be directed toward the reflective surface of the corresponding first reflective component 1041. Each first reflective component 1041 can use its reflective surface to direct the received laser light away from the base plate 101 toward the reflective surface of the corresponding second reflective component 1042. The second reflective component 1042 uses its reflective surface to reflect the received laser light in a target direction, parallel to the surface of the base plate 101 and perpendicular to the light emission direction of the first light-emitting chip 103a. As shown in Figures 1 to 3, the first reflective component 1041 directs the laser light in the z-direction toward the corresponding second reflective component 1042. The second reflective component 1042 then deflects the received laser light 90 degrees, reflecting it in the y-direction. After passing through the first and second reflective components 1041 and 1042, the fast axis of the laser light changes from being parallel to the z-direction to being parallel to the x-direction, and the slow axis of the laser light changes from being parallel to the y-direction to being parallel to the z-direction. Furthermore, the divergence angles of the laser light on the fast and slow axes are interchanged, while the spot size does not significantly change. This increases the laser's divergence angle on the fast axis while keeping the spot size small, effectively increasing the optical parameter product on the fast axis. On the slow axis, the laser's divergence angle decreases while keeping the spot size large, effectively reducing the optical parameter product on the slow axis. Consequently, the optical parameter products of the laser on the fast and slow axes can be relatively close, ensuring a relatively balanced beam quality on both the fast and slow axes.

[0053] For example, Figure 4 is a schematic diagram of a light spot formed by a laser in front of a first reflective component provided in an embodiment of the present application. As shown in Figure 4, at the first reflective component 1041, the lasers emitted by a row of first light-emitting chips 103a form a rectangular light spot as a whole. The width of the rectangular light spot on the fast axis is smaller than the width on the slow axis, and the divergence angle of the laser on the fast axis is also smaller than the divergence angle on the slow axis. For example, at the first reflective component 1041, the width of the rectangular light spot formed by the laser in the z direction (fast axis) is approximately 0.3 mm, the divergence angle of the laser is approximately 0.5 degrees, and the optical parameter product of the laser in the z direction is 26 mm × mrad. The width of the rectangular light spot in the y direction (slow axis) is approximately 2.75 mm, the divergence angle of the laser is approximately 5 degrees, and the optical parameter product of the laser in the y direction is 240 mm × mrad. Figure 5 is a schematic diagram of a light spot formed by a laser after a second reflective component provided in an embodiment of the present application. As shown in Figure 5, after passing through the second reflective component 1042, the laser beam becomes a rectangular spot with a width of approximately 3 mm and a divergence angle of approximately 0.5 degrees in the x-direction (fast axis), and a width of approximately 0.3 mm and a divergence angle of approximately 5 degrees in the z-direction (slow axis). Thus, after passing through the second reflective component 1042, the optical parameter product (BPP) of the laser on the fast axis is 0.3 mm × 5° = 26 mm × mrad, and the optical parameter product (BPP) on the slow axis is 3 mm × 0.5° = 26 mm × mrad. It can be seen from this that after passing through the first reflective component 1041 and the second reflective component 1042, the optical parameter products of the laser on the fast and slow axes are essentially the same, and the beam quality of the laser in different directions is relatively balanced.

[0054] In the embodiment of the present application, the inclination of the reflective surface of the first reflective component 1041 and the reflective surface of the second reflective component 1042 can both be 45 degrees, and the inclination refers to the angle formed with the plate surface. The laser directed to the first reflective component 1041 is in the x-direction, and the first reflective component 1041 turns the laser 90 degrees and then shoots it in the z-direction to the second reflective component 1042, and then the second reflective component 1042 turns the laser again 90 degrees and then emits it in the target direction. Optionally, the inclination of the reflective surface of the first reflective component 1041 and the reflective surface of the second reflective component 1042 can also be other angles, and accordingly, the transmission direction of the laser between the first reflective component 1041 and the second reflective component 1042 will also deviate to a certain extent, which is not limited in the embodiment of the present application.

[0055] In the embodiment of the present application, the first collimating lens 105 is disposed on the base plate 101 , so that there is no need to dispose a layer of collimating lenses in the z direction, which can reduce the thickness of the laser 10 and is conducive to the miniaturization of the laser 10 .

[0056] In summary, in the laser 10 provided in the embodiments of the present application, a collimating lens is disposed on the base plate 101. The collimating lens is used to reduce the divergence angle of the laser light emitted by the light-emitting chip on the fast axis, so that the divergence angle and spot width of the laser light on the fast axis are both smaller than the divergence angle and spot width on the slow axis, and then the laser light is emitted toward the first reflective component 1041. The first reflective component 1041 can then emit the laser light in a direction away from the base plate 101 toward the second reflective component 1042, so that the second reflective component 1042 can emit the laser light in a target direction parallel to the base plate 101 and perpendicular to the light emission direction of the light-emitting chip. In this way, after passing through the first reflective component 1041 and the second reflective component 1042, the divergence angles of the laser light on the fast and slow axes can be replaced, so that the laser light emitted from the second reflective component 1042 has a larger divergence angle and a smaller spot width on the fast axis, and a smaller divergence angle and a larger spot width on the slow axis. Therefore, the difference between the optical parameter products of the laser light on the fast and slow axes is small, and the quality of the laser light emitted by the laser 10 can be improved.

[0057] In the embodiment of the present application, the first collimating lens 105 is located on the base plate 101, and the laser emitted by the first light-emitting chip 103a is collimated by the first collimating lens 105 and then sequentially emitted to the first reflecting component 1041 and the second reflecting component 1042. Optionally, the first collimating lens 105 can also be located on the side of the second reflecting component 1042 away from the base plate 101. The laser emitted by the first light-emitting chip 103a can first pass through the first reflecting component 1041 and the second reflecting component 1042 to balance the fast and slow axis beam quality, and then be emitted to the first collimating lens 105 to limit the divergence angle. In this way, the laser emitted from the first light-emitting chip 103a will expand significantly during the process of being transmitted from the first reflecting component 1041 to the second reflecting component 1042. The size of the second reflecting component 1042 needs to be larger to ensure complete reception of the laser. Correspondingly, the light spot formed by the laser emitted from the second reflecting component 1042 is also larger, which will have a certain impact on the subsequent transmission and utilization of the laser.

[0058] To address the issue of a large spot size formed by the laser light emitted by the second reflective component 1042 in this method, a dichroic mirror can be provided after the second reflective component 1042 to combine the laser light emitted by each second reflective component 1042 to reduce the spot size. Alternatively, the second reflective component 1042 can be configured as a dichroic mirror so that some second reflective components 1042 reflect the laser light to other second reflective components 1042 and transmit the laser light through these other second reflective components 1042 to reduce the spot size. However, in this method, since the laser light needs to undergo additional reflection or transmission, it may have a certain impact on the brightness and quality of the combined laser light.

[0059] In an embodiment of the present application, the laser 10 may include a plurality of first light-emitting chips 103a having the same light-emitting direction and arranged in a row, and the row direction (i.e., the arrangement direction) of the plurality of first light-emitting chips 103a is perpendicular to the light-emitting direction, such as the light outlets of the plurality of first light-emitting chips 103a may be in the same straight line. Figures 1 to 3 take the example of a laser 10 including only three first light-emitting chips 103a arranged in a row along the y direction, and the light-emitting directions of the three first light-emitting chips 103a are all in the x direction. Optionally, the laser 10 may also include multiple rows of first light-emitting chips 103a, and the number of first light-emitting chips 103a in each row may be 2, 3, 4, or other numbers; each row of first light-emitting chips 103a and its corresponding first collimating lens 105, first reflective component 1041, and second reflective component 1042 may all refer to the relevant introduction about the first light-emitting chips 103a in the row in Figures 1 to 3. Optionally, the first light-emitting chips 103a in the laser 10 may not be arranged in rows, such as in a staggered or scattered arrangement. It is only necessary to ensure that each first light-emitting chip 103a corresponds to a first collimating lens 105, a first reflecting component 1041 and a second reflecting component 1042. The laser emitted by the first light-emitting chip 103a can be transformed in transmission direction through the first reflecting component 1041 and the second reflecting component 1042 to achieve adjustment of the divergence angle on the fast and slow axes of the laser.

[0060] In the laser 10, each first light-emitting chip 103a in a row of first light-emitting chips 103a corresponds to a first reflective component 1041 and a second reflective component 1042, and different first light-emitting chips 103a correspond to different first reflective components 1041 and second reflective components 1042. The reflective surfaces of the first reflective components 1041 corresponding to the first light-emitting chips 103a in the row can be parallel to each other, and the reflective surfaces of the second reflective components 1042 can also be parallel to each other. The first reflective components 1041 corresponding to the first light-emitting chips 103a in the row are staggered in the row direction of the first light-emitting chips 103a (e.g., the y-direction), and correspondingly, the second reflective components 1042 can be staggered in the x-direction.

[0061] As shown in Figures 1 to 3, the spacing between different first light-emitting chips 103a in the same row and the reflective surfaces of the corresponding first reflective components 1041 varies; that is, for two first light-emitting chips 103a in the same row, the spacing between one first light-emitting chip 103a and the reflective surface of its corresponding first reflective component 1041 is different from the spacing between the other first light-emitting chip 103a and the reflective surface of its corresponding first reflective component 1041. The spacing between two components refers to the distance between the ends of the two components that are closest to each other. On a reference plane perpendicular to the x-direction, the orthographic projections of the second reflective components 1042 at least partially do not overlap to prevent laser light reflected by a second reflective component 1042 from being blocked by other second reflective components 1042.

[0062] For example, in the laser 10, along the row direction (i.e., the arrangement direction) of the first light-emitting chips 103a, the spacing between the first light-emitting chips 103a and the corresponding reflective surface of the first reflective component 1041 increases sequentially. As shown in Figures 1 to 3, along the y-direction, the spacing between the second first light-emitting chip 103a and the corresponding reflective surface of the first reflective component 1041 is greater than the spacing between the first first light-emitting chip 103a and the corresponding reflective surface of the first reflective component 1041; and the spacing between the third first light-emitting chip 103a and the corresponding reflective surface of the first reflective component 1041 is greater than the spacing between the second first light-emitting chip 103a and the corresponding reflective surface of the first reflective component 1041. Optionally, in the laser 10, the spacing between the first light-emitting chips 103a and the corresponding reflective surface of the first reflective component 1041 may also increase sequentially along the direction opposite to the y-direction. This ensures that, after the second reflective components 1042 are configured accordingly, the arrangement of the light spots formed by the lasers emitted by each second reflective component 1042 is the same as the arrangement of the light spots formed by the lasers emitted by each first light-emitting chip 103a toward the first reflective component 1041, ensuring consistency in the arrangement of the laser light spots at each position. Optionally, the spacing between each first light-emitting chip 103a and the reflective surface of the corresponding first reflective component 1041 may also increase or decrease irregularly along the y-direction. For example, along the y-direction, the spacing between the second first light-emitting chip 103a and the reflective surface of the corresponding first reflective component 1041 may be the largest. This is not limited in the present embodiment.

[0063] Optionally, the distance between the two first reflective components 1041 that are farthest apart in the x-direction may be equal to the distance between the two first reflective components 1041 that are farthest apart in the y-direction, so that, based on this, the second reflective components 1042 are configured accordingly, the width of the laser light emitted by each second reflective component 1042 is similar to the width of the laser light emitted by each first reflective component 1041. The distance between two components may refer to the distance between the center points of the two components, or the distance between the ends of the two components located on the same side.

[0064] Optionally, the distance between any two first reflecting components 1041 that are closest to each other in the x-direction is equal, so that it can be ensured that after the second reflecting components 1042 are set accordingly based on this, the laser light emitted by each second reflecting component 1042 can be evenly distributed. Figure 6 is a schematic diagram of the setting position of a first reflecting component and a second reflecting component provided in an embodiment of the present application. As shown in Figure 6, the distance L1 between the two first reflecting components 1041 that are closest to each other in the x-direction can be 0.35 mm, or 0.4 mm or other distances, which is not limited in the embodiment of the present application. The distance between any two first reflecting components 1041 that are closest to each other in the y-direction can also be equal. As shown in Figure 6, the distance L2 can be 1.3 mm, or 1.4 mm or other distances, which is not limited in the embodiment of the present application. Optionally, L1 can also be equal to L2.

[0065] The spacing between each second reflective component 1042 and the base plate 101 corresponding to a row of first light-emitting chips 103a in the laser 10 can be the same. This ensures that the laser light emitted by each second reflective component 1042 forms a light spot of a desired shape, such as a rectangular light spot, ensuring that the emitted laser light meets the light collection requirements and avoids the laser light forming multiple small light spots at different positions.

[0066] In the embodiment of the present application, the distance between each first reflecting component 1041 and the distance between each second reflecting component 1042 in the x-direction can be adjusted to adjust the aspect ratio of the light spot formed by the laser, thereby realizing the shaping of the laser and making the shape of the light spot meet the requirements of the rear-end light collection. The farther the distance between each first reflecting component 1041 in the x-direction is, the longer the length of the laser emitted by the second reflecting component 1042 in the x-direction will be after the corresponding second reflecting component 1042 is set. In the embodiment of the present application, the distance between the second reflecting component 1042 and the base plate 101 can also be called adjusting the height of the second reflecting component 1042 to adjust the aspect ratio of the light spot formed by the laser. The farther the second reflecting component 1042 is from the base plate 101, the wider the width of the laser emitted by the second reflecting component 1042 in the z-direction will be due to the diffusion of the laser between the first reflecting component 1041 and the second reflecting component 1042.

[0067] In the embodiment of the present application, a high-precision placement device can be used to place each first reflective component 1041 and each second reflective component 1042 to ensure that the positional relationship between each first reflective component 1041 meets the requirements, the positional relationship between each second reflective component 1042 meets the requirements, and the positional relationship between each first reflective component 1041 and the corresponding second reflective component 1042 also meets the requirements. After placement, the position of each reflective component can be measured, and reflective components that do not meet the requirements can be re-placed.

[0068] In an embodiment of the present application, each first reflecting component 1041 may be independent of each other. In an optional manner, the first reflecting component 1041 may be a plane reflector. A plane reflector refers to a reflector that is flat as a whole and has one plate surface as a reflective surface. In another optional implementation, as shown in Figures 1 to 3, the first reflecting component 1041 may be a reflecting prism, and the surface of the reflecting prism close to the corresponding first light-emitting chip 103a is the reflective surface. For example, the reflecting prism is roughly a quadrangular prism with a right-angled trapezoidal bottom surface, and the oblique waist of the right-angled trapezoid is the edge of the reflective surface. Since the reflective surface of the reflecting prism faces the corresponding first light-emitting chip 103a, the right-angled trapezoidal surface is a side surface of the reflecting prism. The shape, size and dimensions of each first reflecting component 1041 can be exactly the same.

[0069] FIG7 is a schematic diagram of a bottom surface of a right-angled trapezoidal reflective prism provided in an embodiment of the present application. As shown in FIG7 , the angle a between the oblique waist and the lower base in the right-angled trapezoid is 45 degrees, the angle b between the oblique waist and the upper base is 135 degrees, the length of the upper base L3 can be 0.89 mm, the length of the lower base L4 can be 1.84 mm, and the height H can be 1 mm. Due to certain manufacturing errors during preparation, the angles and the lengths of each side may have certain errors. For example, the error of angle a can be within 10 minutes, the error of angle b can be within 0.5 degrees, the error of the length of the upper base L3 can be within 0.05 mm, the error of the lower base L4 can be within 0.15 mm, and the error of the height H can be within 0.02 mm. Optionally, the height (dimension in the y direction) of the quadrangular prism can be 1.02 mm, and the distance between adjacent reflective prisms in the y direction can be 0.3 mm.

[0070] Optionally, each first reflective component 1041 corresponding to each row of first light-emitting chips 103a can also be integrally formed, that is, each first reflective component 1041 is a one-piece structure. For example, FIG8 is a schematic structural diagram of a stepped reflector provided in an embodiment of the present application. The first reflective component 1041 corresponding to each row of first light-emitting chips 103a can be replaced by the stepped reflector shown in FIG8 . Each step in the stepped reflector can serve as a first reflective component 1041, and the inclined surface where each step is located (such as the inclined surfaces M1, M2, and M3 in FIG8 ) is a reflective surface. The laser light emitted by each first light-emitting chip 103a can be directed toward the inclined surface where a step is located.

[0071] As shown in Figures 1 to 3, illustratively, the second reflecting components 1042 in the embodiments of the present application can be independent of each other, such as each second reflecting component 1042 can be a plane reflector. For example, the length of the plane reflector is 0.7 mm, the width is 0.6 mm, and the thickness is 0.2 mm. This size is only an example, and the dimensions (length, width and thickness) of the plane reflector can also be other values, which are not limited by the embodiments of the present application. Optionally, the respective second reflecting components 1042 corresponding to each row of the first light-emitting chips 103a can also be integrally formed, that is, each second reflecting component 1042 is an integral structure. For example, the second reflecting components 1042 corresponding to each row of the first light-emitting chips 103a can also be replaced by the stepped reflector shown in Figure 8. It is only necessary to adjust the setting direction of the stepped reflector in Figure 8 so that the reflective surface in the stepped reflector can adjust the laser transmitted along the z direction to be transmitted along the y direction.

[0072] The laser 10 in the embodiment of the present application can be a monochromatic laser, and each first light-emitting chip 103a in the laser 10 is configured to emit laser light of the same color. For example, the laser 10 can be a blue laser, and each first light-emitting chip 103a therein is configured to emit blue laser light, or the laser 10 can also be a red laser or a green laser, which is not limited in the embodiment of the present application. For a monochromatic laser, the arrangement position of the first reflective component 1041 corresponding to each row of the first light-emitting chips 103a can be unrestricted. The spacing between the first reflective component 1041 and the corresponding first light-emitting chip 103a can increase or decrease in sequence along the y-direction, or the spacing between the first reflective component 1041 and the corresponding first light-emitting chip 103a can be the largest or smallest at any position.

[0073] The laser 10 can also be a multicolor laser, which can include at least multiple types of light-emitting chips, with different types of light-emitting chips configured to emit laser light of different colors. For example, the laser 10 is a three-color laser, comprising a red light-emitting chip, a green light-emitting chip, and a blue light-emitting chip, with each type of light-emitting chip configured to emit laser light of a corresponding color. In the same row, only first light-emitting chips 103a configured to emit laser light of the same color can be arranged, or different types of first light-emitting chips 103a can be arranged in the same row.

[0074] When different types of first light-emitting chips 103a are arranged in the same row, the position of the first light-emitting chips 103a in the row can be set based on the divergence angle of the laser light emitted by the different types of first light-emitting chips 103a. For example, the multiple first light-emitting chips 103a located in the same row include at least one first-type light-emitting chip and multiple second-type light-emitting chips. The divergence angle of the laser light emitted by the first-type light-emitting chip is greater than the divergence angle of the laser light emitted by the second-type light-emitting chip. In this way, the multiple second-type light-emitting chips can be located on both sides of the at least one first-type light-emitting chip. In this way, as the laser light diffuses during transmission, the laser light emitted by the first-type light-emitting chip in the middle can be mixed with the laser light emitted by the second-type light-emitting chips on both sides, achieving the combination of laser light of different colors and ensuring a smaller spot size after the combination. In this arrangement, along the y-direction, the spacing between each first light-emitting chip 103a in each row and the corresponding first reflective component 1041 can increase or decrease in sequence.

[0075] For example, in the row of first light-emitting chips 103a in Figures 1 to 3, the first type of light-emitting chip can be the first light-emitting chip 103a located in the middle, which is configured to emit red laser light; the two first light-emitting chips 103a located on both sides are both second type of light-emitting chips, one of the first light-emitting chips 103a is configured to emit blue laser light, and the other first light-emitting chip 103a is configured to emit green laser light. The divergence angle of the red laser light is greater than the divergence angle of the blue laser light, and greater than the divergence angle of the green laser light. In this way, the red laser light located in the middle can be mixed with the blue laser light and the green laser light located on both sides, realizing the combination of the three-color laser light and ensuring that the spot after the combination is small. Optionally, the second type of light-emitting chip can also only include the first light-emitting chip 103a configured to emit laser light of the same color, such as the second type of light-emitting chips are all blue light-emitting chips or green light-emitting chips.

[0076] If the laser 10 is a multi-color laser, the reflective surface of the first reflective component 1041 corresponding to each type of light-emitting chip can be coated with a reflective film that matches the laser light emitted by that type of light-emitting chip to ensure high reflectivity for that laser light. For example, for a first light-emitting chip 103a configured to emit red laser light, the reflective surface of the corresponding first reflective component 1041 must ensure high reflectivity for red laser light; there is no limit on the reflectivity for other colors of light.

[0077] Continuing with reference to Figures 1 to 3, the laser 10 may further include, for example, a plurality of heat sinks 1010. Each of the plurality of heat sinks 1010 may correspond one-to-one to the plurality of first light-emitting chips 103a. Each first light-emitting chip 103a is positioned on a corresponding heat sink 1010, and the heat sink 1010 is configured to assist in heat dissipation of the corresponding first light-emitting chip 103a. The material of the heat sink 1010 may include ceramic.

[0078] Figure 9 is a schematic diagram of the structure of the laser provided in Example 4 of the present application, and Figure 12 is a schematic diagram of the structure of the laser provided in Example 7 of the present application. As shown in Figures 9 and 12, in some embodiments, the laser 10 further includes a frame 102; the frame 102 is fixed to the base plate 101, and the frame 102 surrounds the first light-emitting chip 103a and the reflective component 104. The frame 102 can form a complete groove with the base plate 101, enclosing the first light-emitting chip 103a and the reflective component 104 within the groove, which facilitates the processing and packaging of the laser 10.

[0079] As shown in FIG9 , based on the aforementioned laser, illustratively, the laser 10 further includes a frame 102 and a light-transmitting sealing component 1012. FIG10 is a schematic structural diagram of the laser provided in Example 5 of the present application. FIG10 does not illustrate the frame 102 and the first collimating lens 105. FIG9 may be a front view of the laser shown in FIG10 .

[0080] The frame 102 is a frame-like structure having two opposite annular end faces at both ends in the axial direction (e.g., the z-direction), and an inner wall and an outer wall connecting the two end faces. The frame 102 is fixed to the base plate 101 and surrounds the first light-emitting chip 103a, the first collimating lens 105, and the first reflective component 1041. For example, one end of the frame 102 can be fixed to the base plate 101, and the frame 102 and the base plate 101 enclose a groove, which is also an accommodating space, and the first light-emitting chip 103a, the first collimating lens 105, and the first reflective component 1041 are located in the accommodating space.

[0081] The light-transmitting sealing component 1012 may be in the shape of a plate. The light-transmitting sealing component 1012 is located on the side of the frame 102 away from the base plate 101 and is configured to seal the accommodation space enclosed by the frame 102 and the base plate 101. The material of the frame 102 may be ceramic, and the edge area of ​​the light-transmitting sealing component 1012 may be directly fixed to the surface of the frame 102 away from the base plate 101. For example, the edge area of ​​the light-transmitting sealing component 1012 may be pre-set with solder. The light-transmitting sealing component 1012 may be placed on the side of the frame 102 away from the base plate 101, and the solder may be in contact with the surface of the frame 102 away from the base plate 101. The frame 102 and the light-transmitting sealing component 1012 are then placed together in a high-temperature furnace to melt the solder and then weld the frame 102 and the light-transmitting sealing component 1012.

[0082] The second reflecting component 1042 can be located on the side of the light-transmitting sealing component 1012 away from the base plate 101. In this way, the position of the second reflecting component 1042 can be adjusted after the accommodating space of the laser 10 is sealed, which can ensure that the laser light combining quality is high; and in this way, the accommodating space is smaller and the height of the frame 102 is lower. For example, as shown in Figure 9, the second reflecting component 1042 is fixed to the surface of the light-transmitting sealing component 1012 away from the base plate 101. For example, the second reflecting component 1042 can be fixed to the corresponding position of the surface of the light-transmitting sealing component 1012 away from the base plate 101 by adhesive. Optionally, the side of the light-transmitting sealing component 1012 away from the base plate 101 can have multiple grooves, and adhesive can be set in the grooves, and each second reflecting component 1042 is located in a groove. The groove can limit the position of the second reflecting component 1042 and ensure the fixing stability of the second reflecting component 1042.

[0083] Alternatively, the second reflective component 1042 may be fixed to the side of the light-transmitting sealing component 1012 away from the bottom plate 101 using other fixing components, rather than being fixed to the light-transmitting sealing component 1012. For example, the fixing components may clamp opposite sides of the second reflective component 1042 to secure the second reflective component 1042. In this manner, as well as in the manner shown in FIG9 in which the light-transmitting sealing component 1012 is not provided with a groove to secure the second reflective component 1042, the position of the second reflective component 1042 can be adjusted more flexibly, which facilitates shaping of the laser light by adjusting the position of the second reflective component 1042.

[0084] Optionally, Figure 11 is a structural diagram of the laser provided in Example 6 of the present application. As shown in Figure 11, the laser 10 may further include a sealing frame 1013. The outer edge area of ​​the sealing frame 1013 is fixed to the surface of the frame body 102 away from the base plate 101, and the inner edge area of ​​the sealing frame 1013 is fixed to the edge of the light-transmitting sealing component 1012. The light-transmitting sealing component 1012 is fixed to the frame body 102 through the sealing frame 1013. Optionally, the inner edge area of ​​the sealing frame 1013 can be recessed toward the base plate 101 relative to the outer edge area. The fixing method of the second reflective component 1042 in the laser 10 shown in Figure 11 can refer to the above-mentioned introduction to Figures 9 and 10, and will not be repeated in the embodiments of the present application.

[0085] In this type of laser 10, the frame 102 and the sealing frame 1013 can both be made of metal, and the sealing frame 1013 and the frame 102 can be welded together using a parallel welding technique. Because parallel welding generates heat locally and relatively little in the contact area between the welded objects, less heat is transferred to the first light-emitting chip 103a when the light-transmitting sealing component 1012 and the frame 102 are secured together. This heat has a relatively small impact on the first light-emitting chip 103a, thereby reducing the risk of damage to the first light-emitting chip 103a.

[0086] The above contents of this application are all described with respect to the second reflecting component 1042 being located on the side of the light-transmitting sealing component 1012 away from the base plate 101. Optionally, the second reflecting component 1042 may also be located on the side of the light-transmitting sealing component 1012 close to the base plate 101, that is, in the accommodating space of the laser 10. In an optional implementation, the second reflecting component 1042 may be fixed to the surface of the light-transmitting sealing component 1012 close to the base plate 101, such as being integrally formed with the light-transmitting sealing component 1012. In another optional implementation, each second reflecting component 1042 may be fixed to the corresponding first reflecting component 1041, such as being integrally formed with the second reflecting component 1042. In yet another optional implementation, each second reflecting component 1042 corresponding to each row of first light-emitting chips 103a and each second reflecting component 1042 may all be fixed, such as being integrally formed. For example, each second reflecting component 1042 is a stepped reflecting mirror, and each first reflecting component 1041 is an independent reflecting prism or plane reflecting mirror; or each second reflecting component 1042 is an independent plane reflecting mirror, and each first reflecting component 1041 is a stepped reflecting mirror.

[0087] As shown in Figures 9 to 11, in the laser 10 of the embodiment of the present application, the first collimating lens 105 is set on the base plate 101. In this way, there is no need to set another layer of collimating lens outside the light-transmitting sealing component 1012. The thickness of the laser 10 can be reduced to a certain extent, which is conducive to the miniaturization of the laser 10.

[0088] In summary, in the laser provided in the embodiment of the present application, a collimating lens is set on the base plate, and the collimating lens is used to reduce the divergence angle of the laser emitted by the light-emitting chip on the fast axis, so that the divergence angle and spot width of the laser on the fast axis are smaller than the divergence angle and spot size on the slow axis, and then emitted to the first reflecting component; the first reflecting component can emit the laser in a direction away from the base plate to the second reflecting component, so that the second reflecting component can emit the laser in a target direction parallel to the base plate and perpendicular to the light-emitting direction of the light-emitting chip. In this way, the divergence angles of the laser on the fast and slow axes can be replaced after passing through the first reflecting component and the second reflecting component, so that the laser emitted from the second reflecting component has a larger divergence angle and a smaller spot width on the fast axis, and a smaller divergence angle and a larger spot width on the slow axis. Therefore, the difference between the optical parameter products of the laser on the fast axis and the slow axis is small, and the quality of the laser emitted by the laser can be better.

[0089] Figure 12 is a schematic diagram of the structure of the laser provided in Example 7 of the present application, Figure 13 is a schematic diagram of the structure of the laser provided in Example 8 of the present application, Figure 12 is a top view of the laser shown in Figure 13, and Figure 13 is a schematic diagram of the cross-section of the laser shown in Figure 12.

[0090] As shown in Figures 12 and 13, in some embodiments, the reflective component 104 includes a concave reflector 1043; the concave reflector 1043 is located on the base plate 101, and the concave emitting mirror corresponds to the first light-emitting chip 103a; the first light-emitting chip 103a is configured to emit a laser to the concave reflector 1043, and the concave reflector 1043 is configured to reflect the received laser along the target direction.

[0091] Through the above arrangement, the concave reflector 1043 in the laser 10 of this embodiment also converges the laser light to a certain degree during the reflection process. Therefore, the divergence angle of the laser light after reflection by the concave reflector 1043 can be reduced, thereby achieving laser beam shaping. For example, the concave reflector 1043 can collimate the laser light, that is, adjust the laser light to be nearly parallel light.

[0092] As shown in Figures 12 and 13, in some embodiments, the laser 10 further includes a first light homogenizing component 106; the first light homogenizing component 106 is located in the target direction of the concave reflector 1043; the concave reflector 1043 is configured to direct the received laser toward the first light homogenizing component 106, and the first light homogenizing component 106 is configured to homogenize the received laser and then emit it along the target direction.

[0093] As shown in Figures 12 and 13, in some embodiments, there are multiple first light-emitting chips 103a, the multiple first light-emitting chips 103a have the same light-emitting direction, and the multiple first light-emitting chips 103a are arranged along an arrangement direction, which is perpendicular to the light-emitting direction of the first light-emitting chip 103a. The arrangement direction is represented by the y direction in Figure 12. In other embodiments, the laser 10 further includes a frame 102; the frame 102 is fixed to the base plate 101, and the frame 102 surrounds the first light-emitting chip 103a and the reflective component 104. The frame 102 can construct a complete groove with the base plate 101, enclosing the first light-emitting chip 103a and the reflective component 104 in the groove, which is beneficial to the processing and packaging of the laser 10.

[0094] As shown in FIG. 12 and FIG. 13 , in some embodiments, the laser 10 includes: a base plate 101 , a frame 102 , at least one first light-emitting chip 103 a , at least one concave reflector 1043 , and a first light-homogenizing component 106 .

[0095] The base plate 101 is a plate-like structure having two relatively large plate surfaces and a plurality of smaller side surfaces connecting the two plate surfaces. The frame 102 is a frame-like structure having two relatively large annular end surfaces and an inner wall and an outer wall connecting the two annular end surfaces. It can also be said that the frame-like structure includes a plurality of side walls, which can be connected in sequence to enclose a closed area, and the frame-like structure has two openings connected in the height direction of the side wall (such as the z direction in Figure 12), each opening being surrounded by an annular end surface. In the embodiment of the present application, one of the side walls of the frame 102 has a light outlet K.

[0096] The base plate 101 is fixed to the frame 102. The at least one first light-emitting chip 103a and the at least one concave reflector 1043 are both located on the base plate 101 and surrounded by the frame 102. The base plate 101 and the frame 102 can enclose a groove, with the base plate 101 forming the bottom of the groove and the frame 102 forming the sidewalls of the groove. The groove is a storage space, and the at least one first light-emitting chip 103a and the at least one concave reflector 1043 are both located in the groove. The first light-emitting chip 103a and the concave reflector 1043 are both located on the base plate 101 and surrounded by the frame 102. The structure formed by the base plate 101 and the frame 102 can be referred to as a tube shell.

[0097] The at least one first light-emitting chip 103a in the laser 10 corresponds one-to-one with at least one concave reflector 1043, with each concave reflector 1043 located on the light-emitting side of the corresponding first light-emitting chip 103a. Laser light emitted by the first light-emitting chip 103a is directed toward the corresponding concave reflector 1043, which is configured to reflect the received laser light. Concave reflector 1043 also converges the laser light to a certain degree during the reflection process, thereby reducing the divergence angle of the laser light after reflection from concave reflector 1043. For example, concave reflector 1043 can collimate the laser light, that is, adjust the laser light to be nearly parallel light.

[0098] Because the laser light emitted by each first light-emitting chip 103a can be collimated by the corresponding concave reflector 1043, even if there are errors in the mounting positions of the first light-emitting chips 103a, the positions of the corresponding concave reflectors 1043 can be adjusted accordingly to ensure that the laser light emitted by each first light-emitting chip 103a is well collimated. Therefore, the collimation effect of the laser light emitted by the laser 10 is good. Figures 12 and 3 illustrate an example in which the laser 10 includes three first light-emitting chips 103a. Optionally, the number of first light-emitting chips 103a can also be one, two, or more, and this embodiment of the application is not limited thereto.

[0099] The first light homogenizing component 106 is located in the transmission path of the laser light emitted from the concave reflector 1043 and is configured to homogenize the received laser light before emitting it. The laser light reflected by the concave reflector 1043 can be emitted through the first light homogenizing component 106 and the light outlet K on the side wall of the frame 102 to achieve light output from the laser 10. This ensures that the laser light emitted by the laser 10 has a high uniformity. The laser 10 of the embodiment of the present application can also be referred to as a side-emitting laser.

[0100] In one arrangement of the first light-homogenizing component 106, the first light-homogenizing component 106 can be located in a groove enclosed by the base plate 101 and the frame 102. The laser reflected by the concave reflector 1043 is homogenized by the first light-homogenizing component 106 and then emitted from the groove through the light outlet K. As shown in Figures 12 and 3, the first light-homogenizing component 106 is located on the base plate 101 and surrounded by the frame 102. Optionally, the first light-homogenizing component 106 can also be fixed to the frame 102, such as the first light-homogenizing component 106 can be fixed to the inner wall surface of the side wall of the frame 102 where the light outlet K is located, and cover the light outlet K. This method is not illustrated in the embodiments and drawings of this application. In this method, the first light-homogenizing component 106 can simultaneously achieve sealing of the light outlet K.

[0101] In another arrangement of the first light homogenizing component 106, the first light homogenizing component 106 is located outside the groove, and the laser reflected by the concave reflector 1043 is emitted from the light outlet K and then homogenized by the first light homogenizing component 106. Figure 14 is a schematic diagram of the structure of the laser provided in Example 9 of the present application. As shown in Figure 14, the first light homogenizing component 106 can be fixed to the outer wall surface of the side wall of the frame 102 where the light outlet K is located, and cover the light outlet K. In this embodiment, the first light homogenizing component 106 can also achieve a seal for the light outlet K.

[0102] In the embodiment of the present application, the laser 10 is a side-emitting laser, so there is no need to set a reflective prism or a large collimating lens group outside the tube shell. The laser light emitted by the first light-emitting chip 103a in the laser 10 is directly reflected by the concave reflector 1043, so the laser divergence angle can be directly reduced, the light spot formed by the laser during the subsequent transmission process is smaller, and the size of the components on the subsequent transmission path of the laser (such as the first light-homogenizing component 106) can be smaller. Since the laser 10 includes smaller components than the lasers of the related art, the volume of the laser 10 can be smaller. When the laser 10 is used as a light source in a projection device, it can also be conducive to the miniaturization of the projection device.

[0103] In summary, in the laser provided in the embodiment of the present application, the laser emitted by the light-emitting chip can be directly emitted after being reflected by the concave reflector and homogenized by the light-homogenizing component. The concave reflector can collimate the laser while reflecting the laser. Therefore, the laser emitted by the laser has good collimation and uniformity, and the laser light efficiency is good. In addition, the laser is directly collimated after being emitted from the light-emitting chip, which reduces the divergence angle of the laser. Therefore, the divergence degree of the laser in the subsequent transmission process is small, and the size of the components in the light path after collimation (such as the light-homogenizing component) is small. In this way, the components in the laser are small, so the volume of the laser is small.

[0104] In the embodiment of the present application, the first light-emitting chip 103a refers only to the light-emitting chip that emits laser light toward the concave reflector 1043. The first light-emitting chip 103a may include different types of light-emitting chips configured to emit laser light of different colors, such as a light-emitting chip configured to emit red laser light, a light-emitting chip configured to emit green laser light, and a light-emitting chip configured to emit blue laser light. The divergence angles of laser light of different colors will vary to a certain extent. The parameters (such as curvature) of the concave reflector 1043 corresponding to the different types of light-emitting chips can be designed accordingly based on the divergence angle of the laser light configured to be received, so that the collimation of the laser light emitted by each concave reflector 1043 is high. Optionally, the parameters of each concave reflector 1043 can also be the same to simplify the preparation process of the laser 10. The curved reflective surface of the concave reflector 1043 can be a shape formed by parabolic rotation.

[0105] In the embodiment of the present application, the first light homogenizing component 106 may include a light homogenizer or a fly-eye lens. The accompanying drawings illustrate the first light homogenizing component 106 as a fly-eye lens. The fly-eye lens may be composed of two opposing single-sided fly-eye lenses, or a single double-sided fly-eye lens. The light homogenizer may include multiple microlenses or prisms to homogenize and superimpose the incident light beam to achieve the light homogenization function.

[0106] The parameters of the microlenses on both sides of the compound eye lens can be identical. A parallel light beam is projected perpendicularly onto the multiple microlenses on the first side of the compound eye lens and can be divided into multiple small light beams by each microlens. Each microlens can focus the received small light beam at the center of the corresponding microlens on the second side, which is then emitted by the microlens on the second side. The small light beams emitted from each microlens can be superimposed on each other, compensating for subtle unevenness in each small light beam, thereby achieving a uniform light function and ensuring a high uniformity of the light spot.

[0107] 12 to 14 , illustratively, the laser 10 further includes a heat sink 1010 fixed to the base plate 101 and surrounded by the frame 102 . The heat sink 1010 can correspond one-to-one to the light-emitting chips in the laser 10, and each light-emitting chip is fixed to the corresponding heat sink 1010 so as to be fixed to the base plate 101 through the heat sink 1010 . FIG12 to FIG14 illustrate the case where the light-emitting chip is located on the surface of the corresponding heat sink 1010 away from the base plate 101 as an example. Optionally, FIG15 is a structural schematic diagram of the laser provided in Example 10 of the present application. As shown in FIG15 , the light-emitting chip can also be located on the side of the corresponding heat sink 1010. If the heat sink 1010 is in the shape of a rectangular parallelepiped, the side of the heat sink 1010 is also on a surface perpendicular to the base plate 101. The perpendicular (or parallel) to the base plate 101 described in the embodiment of the present application refers to the perpendicular (or parallel) to the plate surface of the base plate 101. The following embodiments are all illustrated by taking the example that the light-emitting chip can also be located on the side of the corresponding heat sink 1010 .

[0108] Heat sink 1010 has excellent thermal conductivity, which can help the corresponding light-emitting chip dissipate heat effectively and also facilitate electrical connection to the corresponding light-emitting chip. Heat sink 1010 has a thermal expansion coefficient close to that of the light-emitting chip, which can effectively alleviate stress generated during material temperature changes. For example, the material of heat sink 1010 may include ceramic. The light-emitting chip and heat sink 1010 can be formed by eutectic welding. The upper and lower surfaces of the light-emitting chip and heat sink 1010 can be gold-plated. Solder can be pre-applied to the mounting surfaces of the light-emitting chip and heat sink 1010, and the light-emitting chip and heat sink 1010 can be mounted using this solder.

[0109] With reference to Figures 13 and 14, illustratively, the laser 10 also includes a sealing cover 1011, which is not illustrated in Figure 12. The sealing cover 1011 is fixed to the side of the frame 102 away from the base plate 101, and the sealing cover 1011 is configured to seal the groove surrounded by the base plate 101 and the frame 102. The sealing cover 1011 can be a light-transmitting component or an opaque component, which is not limited in the embodiment of the present application. The base plate 101, the frame 102, the sealing cover 1011 and the sealing component of the light outlet K can form a packaging structure, which is configured to encapsulate the components in the groove. In this way, it is possible to prevent external water, oxygen and other substances from corroding the various components in the groove, ensure the working reliability of each component, and extend the life of the laser. For example, the bottom edge of the sealing cover 1011 can be pre-set with solder (such as gold-tin solder), and the sealing cover and the frame 102 can be fixed by high-temperature welding of the solder to seal the groove.

[0110] FIG14 takes the first light homogenizing component 106 as an example of a sealing component for the light outlet K. When the first light homogenizing component 106 is located in the groove defined by the base plate 101 and the frame 102, the laser 10 may further include a sealing component for the light outlet K. As shown in FIG13 , the sealing component may be a flat glass P.

[0111] Figure 16 is a schematic diagram of the structure of the laser provided in Example 11 of the present application. As shown in Figure 16, optionally, the laser 10 may further include a converging lens 108, which is configured to converge the received laser. In one arrangement of the converging lens 108, the converging lens 108 is located outside the groove surrounded by the base plate 101 and the frame 102. Optionally, the converging lens 108 can be fixed to the frame 102, such as the schematic diagram of the structure of a laser provided in another embodiment of the present application shown in Figure 16. As shown in Figure 16, the converging lens 108 is fixed to the outer wall surface of the side wall where the light outlet K in the frame 102 is located, and covers the light outlet K. Figure 16 takes the converging lens 108 having two opposite convex curved surfaces as an example. The converging lens 108 may also be a plano-convex lens, which is not limited in the embodiment of the present application.

[0112] In one configuration of the converging lens 108, the converging lens 108 can be located in the optical path before the first light homogenizing component 106, where it converges the laser light passing through the concave reflector 1043 onto the first light homogenizing component 106. Alternatively, the converging lens 108 can be located in the optical path after the first light homogenizing component 106, where the laser light homogenized by the first light homogenizing component 106 is converged by the converging lens 108 before being emitted. It should be noted that the converging lens 108 in this configuration is not shown in the accompanying drawings.

[0113] In another configuration of the converging lens 108, the converging lens 108 is located in a groove defined by the base plate 101 and the frame 102. Alternatively, the converging lens 108 is located on the base plate 101 and surrounded by the frame 102. Alternatively, the converging lens 108 can be fixed to the frame 102. For example, the converging lens 108 is fixed to the inner wall of the side wall of the frame 102 where the light outlet K is located, and covers the light outlet K. It should be noted that the converging lens 108 in this configuration is not shown in the accompanying drawings.

[0114] In the manner in which the converging lens 108 covers the light outlet K, the converging lens 108 can serve as a sealing component for the light outlet K, and an additional sealing component for the light outlet K may no longer be provided in the laser 10; alternatively, the laser 10 may still be provided with another sealing component to seal the light outlet K, which is not limited in the embodiment of the present application.

[0115] The components in the laser 10 can be arranged in a variety of ways, and accordingly, the optical path of the laser emitted by the light-emitting chip can also be implemented in a variety of different ways. The following introduces the optional arrangement of the components in the laser 10 and the optional transmission method of the laser.

[0116] In an optional structure of a laser 10, please refer to Figures 12 to 16. The laser 10 includes a plurality of first light-emitting chips 103a and a plurality of concave reflectors 1043 corresponding to each other. The plurality of first light-emitting chips 103a are arranged in a row, such as the arrangement direction is the y direction. The light-emitting directions of the plurality of first light-emitting chips 103a can be the same and perpendicular to the arrangement direction, such as the light-emitting directions of the first light-emitting chips 103a are all in the x direction, and the x direction is perpendicular to the y direction. The plurality of concave reflectors 1043 can be staggered with each other in the arrangement direction of the first light-emitting chips 103a to avoid blocking the laser light reflected by other concave reflectors 1043. Optionally, the plurality of first light-emitting chips 103a may not be arranged in a row along a certain direction, but may be staggered with each other.

[0117] Figures 12 to 16 use the y-direction as an example, where the distances between each first light-emitting chip 103a and the corresponding concave reflector 04 decrease in sequence. Alternatively, the distances between each first light-emitting chip 103a and the corresponding concave reflector 04 may not decrease in sequence or may increase in sequence. For example, the distance between the first light-emitting chip 103a located in the middle and the corresponding concave reflector 1043 may be the greatest, but this is not a limitation in this embodiment.

[0118] Optionally, the laser 10 may include two first light-emitting chips 103a with light emitting directions facing each other, and the two concave reflectors 1043 corresponding to the two first light-emitting chips 103a are located between the two first light-emitting chips 103a. The two first light-emitting chips 103a and the two corresponding concave reflectors 1043 may be arranged in a straight line in the light emitting direction of the first light-emitting chips 103a.

[0119] In this type of laser 10, because the concave reflector 1043 deflects the transmission direction of the laser light emitted by the first light-emitting chip 103a, the sidewall having the light outlet K is a sidewall in a direction other than the light outlet direction of the first light-emitting chip 103a in the frame 102. For example, this sidewall is a sidewall in the frame 102 perpendicular to the light outlet direction, that is, one of the two sidewalls in the y-direction.

[0120] In another optional structure of the laser 10 , the side wall having the light outlet K is the side wall on the light-emitting side of the first light-emitting chip 103 a in the frame 102 .

[0121] Figure 17 is a schematic diagram of the structure of the laser provided in Example 12 of the present application. As shown in Figure 17, illustratively, the laser 10 also includes a plane reflector 109 corresponding to each concave reflector 1043. The plane reflector 109 can be located on the base plate 101 and surrounded by the frame 102. Each plane reflector 109 is located on the light-emitting side of the corresponding concave reflector 1043 and is configured to turn the transmission direction of the laser reflected by the concave reflector 1043 so that the transmission direction of the emitted laser is parallel to the light-emitting direction of the first light-emitting chip 103a. In this way, the laser directed to the first light-homogenizing component 106 and the light outlet K is the laser reflected by the plane reflector 109. In this way, each concave reflector 1043 and the plane reflector 109 can also be arranged along the y direction.

[0122] Figure 17 takes the example of each concave reflector 1043 reflecting the laser in the same direction, e.g., the laser light emitted by the concave reflector 1043 is emitted in the opposite direction of the y-direction. Optionally, the concave reflectors 1043 may reflect the laser light in opposite directions. In this way, the area occupied by each concave reflector 1043 and the plane reflector 109 is smaller, and the volume of the laser 10 can be smaller. Furthermore, the laser beams reflected by the plane reflector 109 can be arranged more closely, and accordingly, the volume of the first light homogenizing component 106 can be smaller, and the size of the light outlet K can also be smaller, so the strength of the frame 102 can be higher, and it is convenient for subsequent adjustment of the laser light.

[0123] FIG18 is a schematic diagram of the structure of a laser provided in Example 13 of the present application. As shown in FIG18 , in some embodiments, there are multiple first light-emitting chips 103a, and the multiple first light-emitting chips 103a are arranged along an arrangement direction that is perpendicular to the light emission direction. The multiple first light-emitting chips 103a are respectively located in a first region and a second region along the arrangement direction, each of which has at least one first light-emitting chip 103a. The concave reflector 1043 corresponding to the first light-emitting chip 103a in the first region reflects the laser light in a first direction, and the concave reflector 1043 corresponding to the first light-emitting chip 103a in the second region reflects the laser light in a second direction, and the first direction and the second direction are opposite to each other.

[0124] The first region (not shown) and the second region (not shown) are arranged along the arrangement direction of the first light-emitting chip 103a (i.e., the y-direction). The concave reflector 1043 corresponding to the first light-emitting chip 103a in the first region reflects the laser in a direction opposite to the concave reflector 1043 corresponding to the first light-emitting chip 103a in the second region. The first and second regions are not labeled in FIG18 . Based on the direction shown in FIG18 , the first region may be the region where the uppermost first light-emitting chip 103a in FIG18 is located, and the second region may be the region where the lowermost first light-emitting chip 103a in FIG18 is located. This embodiment of the present application takes the example of only one light-emitting chip being provided in the first and second regions. Multiple first light-emitting chips 103a may also be provided in the first and second regions, and this embodiment of the present application is not limited thereto.

[0125] Optionally, the laser 10 may include other light-emitting chips in addition to the first light-emitting chip 103a. For example, referring to Figure 18 , the laser 10 may also include at least one second light-emitting chip 103b and at least one second collimating lens 107 in a one-to-one correspondence. Each of the second light-emitting chip 103b and the second collimating lens 107 is located on the base plate 101 and surrounded by the frame 102. Figure 18 illustrates a configuration in which both the second light-emitting chip 103b and the second collimating lens 107 are one. Laser light emitted by the second light-emitting chip 103b is directed toward the corresponding second collimating lens 107, which is configured to collimate the received laser light. This collimated laser light then passes through the first light-homogenizing component 106 and the light outlet K for emission.

[0126] The laser 10 shown in Figure 18 is based on the laser 10 shown in Figure 17, and is configured with a second light-emitting chip 103b and a second collimating lens 107. Based on other lasers 10 provided in this application, the laser 10 can also be configured with a second light-emitting chip 103b and a second collimating lens 107. Figure 19 is a structural schematic diagram of another laser provided in another embodiment of the present application. As shown in Figure 19, based on the laser 10 shown in Figure 15, the laser 10 further includes a second light-emitting chip 103b and a corresponding second collimating lens 107, and the light emitting direction of the second light-emitting chip 103b is perpendicular to the light emitting direction of the first light-emitting chip 103a.

[0127] 18 , in some embodiments, there are multiple first light-emitting chips 103a, and the multiple first light-emitting chips 103a and at least one second light-emitting chip 103b are arranged along an arrangement direction; at least one second light-emitting chip 103b has at least one first light-emitting chip 103a on both sides.

[0128] Alternatively, referring to FIG. 18 , multiple first light-emitting chips 103a and second light-emitting chips 103b may be arranged in a row, with the multiple first light-emitting chips 103a located on either side of the second light-emitting chip 103b in the arrangement direction. The number of first light-emitting chips 103a on either side of the second light-emitting chip 103b may be equal or differ by one. This ensures a good symmetry in the arrangement positions of the various components in the laser 10, and a relatively uniform spacing of the laser light emitted by each light-emitting chip, resulting in a better optical efficiency of the laser light emitted by the laser 10.

[0129] Optionally, the second collimating lens 107 in the embodiment of the present application can be an aspheric lens or a free-form lens. The parameters of the second collimating lens 107 can also be designed based on the divergence angle of the laser light emitted by the second light-emitting chip 103b to ensure that the laser light emitted by the second light-emitting chip 103b is well collimated.

[0130] Optionally, the second light-emitting chip 103b and the first light-emitting chip 103a located on different sides of the second light-emitting chip 103b can be different types of light-emitting chips, configured to emit lasers of different colors. For example, the first light-emitting chip 103a can include a light-emitting chip configured to emit red laser light and a light-emitting chip configured to emit blue laser light, and the second light-emitting chip 103b can include a light-emitting chip configured to emit green laser light.

[0131] In summary, in the laser provided by the embodiment of the present application, the laser emitted by the light-emitting chip can be directly emitted after being reflected by the concave reflector and homogenized by the light-homogenizing component. The concave reflector can collimate the laser while reflecting the laser. Therefore, the laser emitted by the laser has good collimation and uniformity, and the laser light efficiency is good. In addition, the laser is directly collimated after being emitted from the light-emitting chip, which reduces the divergence angle of the laser. Therefore, the divergence degree of the laser in the subsequent transmission process is small, and the size of the components in the light path after collimation (such as the light-homogenizing component) is small. In this way, the size of the components in the laser is small, so the volume of the laser is reduced.

[0132] The laser in the above embodiment of the present application can be used in laser projection as a light source in a projection device. In addition to the laser, the projection light source may also include other optical components.

[0133] Figure 20 is a schematic diagram of the structure of a projection light source provided in Example 15 of the present application; Figure 21 is a schematic diagram of the structure of a projection light source provided in Example 16 of the present application. As shown in Figures 20 and 21, this embodiment provides a projection light source, which includes the laser described in any embodiment of the present application.

[0134] 20 and 21 , in some embodiments, the projection light source further includes at least one of a light combining component 50 , a second light homogenizing component 20 , and a third collimating lens 30 ; the light combining component 50 , the second light homogenizing component 20 , or the third collimating lens 30 is located in the target direction of the laser 10 .

[0135] For example, as shown in FIG20 , the projection light source may include a laser 10 and a second light homogenizing component 20. For example, the second light homogenizing component 20 may be a light pipe, and the laser 10 may be any of the lasers 10 in FIG1 to FIG3 and FIG9 to FIG19 . The second light homogenizing component 20 may be configured to homogenize the laser light emitted by the laser 10 before emitting it for subsequent use.

[0136] Continuing with FIG20 , the projection light source may further include a cylindrical third collimating lens 30 located between the laser 10 and the second light homogenizing component 20. The third collimating lens 30 is configured to reduce the divergence angle of the laser light emitted by the laser 10 on the fast axis before emitting the laser light. The second light homogenizing component 20 is configured to homogenize the laser light emitted by the third collimating lens 30.

[0137] After passing through the second reflective component 1042, although the optical parameter products of the laser on the fast axis and the slow axis are relatively close, the divergence angle on the fast axis becomes larger (e.g., 5 degrees). As the propagation distance of the light beam increases, the size of the light spot on the fast axis will become larger and larger. Therefore, in order to avoid subsequent differences in the size of the light spot on the fast and slow axes, the divergence angle on the fast axis needs to be further reduced. For example, a third collimating lens 30 can be set on the transmission path of the laser emitted by the laser 10 so that only the divergence angle of the laser on the fast axis can be reduced by the third collimating lens 30, without changing the divergence angle of the laser on the slow axis.

[0138] For example, the second light homogenizing component 20 requires that the spot of the received laser be square. In the process of the laser emitted by the laser 10 being transmitted according to the original divergence angle, there will be a position where the spot size of the fast and slow axes is the same, and the laser can form a square spot at this position. The third collimating lens 30 in the embodiment of the present application can be placed at this position. For example, the divergence angle of the laser on the fast axis can be reduced to 0.5 degrees by the third collimating lens 30, so that the subsequent spot size and divergence angle of the laser on the fast and slow axes can be ensured to be the same. Optionally, if the second light homogenizing component 20 requires that the spot of the received laser be rectangular, the position of the third collimating lens 30 can also be adjusted accordingly to ensure that the laser directed to the second light homogenizing component 20 meets the requirements.

[0139] Optionally, please continue to refer to Figure 20, the projection light source may further include a focusing lens 40 located between the third collimating lens 30 and the second light homogenizing component 20, and the laser light after passing through the third collimating lens 30 may be converged to the second light homogenizing component 20 through the focusing lens 40.

[0140] In the projection light source provided in the embodiments of the present application, the quality of the laser light emitted by the laser 10 is relatively balanced on the fast and slow axes. The divergence angles of the laser light on the fast and slow axes can also be adjusted to be consistent in the projection light source, resulting in a high-quality laser light emitted by the projection light source. Furthermore, the laser light emitted by the laser 10 can be combined, eliminating the need for multiple reflective plates behind the laser 10 to combine the light. Consequently, the projection light source can have fewer components, facilitating miniaturization of the projection light source.

[0141] As another example, as shown in FIG21 , the projection light source may include a laser 10 and a light combining component 50. The light combining component 50 is located on the light output side of the laser 10 and is configured to mix the different colors emitted by the laser 10 to reduce the spot size. The laser 10 may be any of the lasers 10 described in FIG1 to FIG3 and FIG9 to FIG19 .

[0142] The laser 10 can be a monochromatic laser, configured to emit laser light of only one color. Alternatively, the laser 10 can be a polychromatic laser, configured to emit laser light of multiple colors. The light combining component 50 can mix the laser light of multiple colors emitted by the laser 10.

[0143] Optionally, the laser 10 is a three-color laser, and the light combining component 50 includes a plurality of light combining lenses arranged in sequence, each light combining lens being configured to receive a laser of one color and reflect the received laser in the same direction parallel to the arrangement direction of the light combining lens, so as to achieve light combining of lasers of different colors. The light combining lens in the rear optical path of the plurality of light combining lenses (such as the lens J1 in FIG. 21 ) can be a reflector, and the light combining lens in the front optical path (such as the lenses J2 and J3 in FIG. 21 ) can be a dichroic mirror to facilitate the passage of light in the rear optical path. The front optical path refers to the optical path where the laser is transmitted earlier, and the rear optical path refers to the optical path where the laser is transmitted later.

[0144] In the projection light source provided in the embodiment of the present application, a light uniforming component and a converging lens are provided in the laser 10, so that the laser light emitted directly by the laser 10 is uniform and relatively convergent. Therefore, it is no longer necessary to provide a light uniforming component or a converging lens outside the laser 10, which can reduce the volume of the projection light source.

[0145] Optionally, the projection light source may further include a shaping component configured to homogenize the laser light emitted by the laser device. The shaping component may shape the laser spot into a shape required for forming a projection image and transmit the shape to subsequent components.

[0146] Embodiments of the present application also provide a projection device, which may include the aforementioned light source assembly, a light valve, and a lens. Laser light emitted by the aforementioned light source assembly may be directed toward the light valve, modulated by the light valve, and then directed toward the lens. The lens can then project the received laser light to form a projection image. Because the laser light emitted by the projection light source is of high quality, the display quality of the projection image formed by the laser light is also good, thereby enhancing the display quality of the projection device.

[0147] In this application, the terms "at least one of A and B" and "A and / or B" are merely a description of the association relationship of associated objects, indicating that there can be three kinds of relationships, namely, A exists alone, A and B exist at the same time, and B exists alone. The term "at least one of A, B, and C" indicates that there can be seven kinds of relationships, which can represent seven situations: A exists alone, B exists alone, C exists alone, A and B exist at the same time, A and C exist at the same time, C and B exist at the same time, and A, B, and C exist at the same time. In the embodiments of the present application, the terms "first" and "second" are configured only for descriptive purposes and cannot be understood as indicating or implying relative importance. The term "at least one" refers to one or more, and the term "plurality" refers to two or more, unless otherwise expressly defined.

[0148] The words "include" and "including" mentioned throughout the specification and claims are open-ended terms and should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem and basically achieve the technical effect. Certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in name as a way to distinguish components, but rather use differences in the functions of the components as the criterion for distinction.

[0149] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A laser, wherein: The laser comprises: a base plate, a first light-emitting chip and a reflective component; The first light-emitting chips are located on the bottom plate, and each of the first light-emitting chips has a corresponding reflective component; The first light-emitting chip is configured to emit laser light toward the reflective component, and the reflective component is configured to reflect the received laser light along a target direction and perform shaping processing on the laser light during the reflection process.

2. The laser according to claim 1, wherein The reflective assembly includes a first reflective component and a second reflective component; The first reflective component is located on the bottom plate, the second reflective component is located on a side of the first reflective component away from the bottom plate, and both the first reflective component and the second reflective component correspond to the first light-emitting chip; The first reflecting component is configured to emit the received laser light in a direction away from the base plate toward the second reflecting component, and the second reflecting component is configured to reflect the received laser light in the target direction, which is parallel to the surface of the base plate and perpendicular to the light emitting direction of the first light-emitting chip.

3. The laser according to claim 2, wherein The laser also includes a first collimating lens; The first collimating lens is located on the bottom plate, the first collimating lens corresponds to the first light-emitting chip, and the first collimating lens is located between the first light-emitting chip and the first reflective component; The first light-emitting chip is configured to emit laser light toward the first collimating lens, and the first collimating lens is configured to reduce the divergence angle of the received laser light on the fast axis and then emit it toward the first reflecting component; the divergence angle of the laser light emitted to the first reflecting component on the fast axis is smaller than the divergence angle on the slow axis.

4. The laser according to claim 1, wherein The reflecting assembly includes a concave reflecting mirror; The concave reflector is located on the bottom plate, and the concave emitting mirror corresponds to the first light-emitting chip; The first light emitting chip is configured to emit laser light toward the concave reflecting mirror, and the concave reflecting mirror is configured to reflect the received laser light along the target direction.

5. The laser according to claim 4, wherein The laser further includes a first light homogenizing component; The first light uniforming component is located in the target direction of the concave reflector; The concave reflecting mirror is configured to direct the received laser light toward the first light homogenizing component, and the first light homogenizing component is configured to homogenize the received laser light and then direct the laser light in the target direction.

6. The laser according to any one of claims 1 to 5, wherein There are multiple first light-emitting chips, the multiple first light-emitting chips have the same light-emitting direction, and the multiple first light-emitting chips are arranged along an arrangement direction, which is perpendicular to the light-emitting direction.

7. The laser according to claim 6, wherein When the reflective assembly includes a first reflective component and a second reflective component; The first reflecting component and the second reflecting component both utilize reflecting surfaces to reflect the received laser light, and the distances between different first light-emitting chips among the plurality of first light-emitting chips and the corresponding reflecting surfaces of the first reflecting component are different. The orthographic projection of the reflecting surface of the second reflecting component on the bottom plate at least partially overlaps with the orthographic projection of the reflecting surface of the first reflecting component.

8. The laser according to claim 7, wherein The distances between the first light-emitting chips and the corresponding reflective surfaces of the first reflective components increase sequentially along the arrangement direction.

9. The laser according to claim 7 or 8, wherein: The first reflective components corresponding to the plurality of first light-emitting chips are independent of each other or formed as one piece; the second reflective components corresponding to the plurality of first light-emitting chips are independent of each other or formed as one piece.

10. The laser according to claim 7 or 8, wherein The first light-emitting chip includes at least one first-type light-emitting chip and multiple second-type light-emitting chips, the divergence angle of the laser emitted by the first-type light-emitting chip is greater than the divergence angle of the laser emitted by the second-type light-emitting chip, and the multiple second-type light-emitting chips are located on both sides of the at least one first-type light-emitting chip.

11. The laser according to claim 6, wherein When the reflective component includes a concave reflector, there are multiple concave reflectors, each of which is located on the light-emitting side of the corresponding first light-emitting chip, and the multiple concave reflectors are staggered with each other in the arrangement direction.

12. The laser according to claim 5, wherein The laser further includes a plane reflecting mirror corresponding to the concave reflecting mirror; The laser light emitted by the concave reflector is directed toward the corresponding plane reflector; the plane reflector is configured to reflect the received laser light so that the transmission direction of the emitted laser light is parallel to the light emission direction of the first light emitting chip; The laser light reflected by the plane reflector is emitted through the first light homogenizing component.

13. The laser according to claim 11, wherein There are multiple first light-emitting chips, and the multiple first light-emitting chips are arranged along an arrangement direction, and the arrangement direction is perpendicular to the light emitting direction; A plurality of the first light-emitting chips are respectively located in a first area and a second area along the arrangement direction, and each of the first area and the second area has at least one first light-emitting chip. The reflection direction of the laser by the concave reflector corresponding to the first light-emitting chip in the first area is a first direction, and the reflection direction of the laser by the concave reflector corresponding to the first light-emitting chip in the second area is a second direction, and the first direction and the second direction are relative.

14. The laser according to claim 12 or 13, wherein: The laser further includes at least one second light-emitting chip and at least one second collimating lens; the second light-emitting chip corresponds to the second collimating lens; The laser light emitted by the second light-emitting chip is directed toward the corresponding second collimating lens, and the second collimating lens is configured to collimate the received laser light.

15. The laser according to claim 14, wherein There are multiple first light-emitting chips, and the multiple first light-emitting chips and the at least one second light-emitting chip are arranged along an arrangement direction; Both sides of the at least one second light-emitting chip are provided with at least one first light-emitting chip.

16. The laser according to any one of claims 1 to 15, wherein The laser also includes a frame; The frame is fixed to the bottom plate, and the frame surrounds the first light-emitting chip and the reflective component.

17. The laser according to claim 16, wherein The laser further comprises a light-transmitting sealing component, wherein the light-transmitting sealing component is fixed to a side of the frame away from the bottom plate; When the reflective assembly includes a first reflective component and a second reflective component; The first light-emitting chip and the first reflective component are both located in a cavity surrounded by the frame and the bottom plate, and the second reflective component is located on a side of the light-transmitting sealing component away from the bottom plate.

18. The laser according to claim 17, wherein The second reflecting component is fixedly connected to the light-transmitting sealing component.

19. The laser according to claim 16, characterized in that The frame includes a plurality of side walls connected in sequence, and one of the plurality of side walls has a light outlet; the light outlet is located in the target direction, and the laser emitted by the reflective component is emitted through the light outlet.

20. The laser according to claim 19, characterized in that When the laser includes a first light uniforming component, the first light uniforming component is located on the bottom plate, and the first light uniforming component is surrounded by the frame; Alternatively, the first light uniforming component is fixed to the frame, and the first light uniforming component is configured to seal the light outlet.

21. The laser according to claim 19, wherein The laser further includes a converging lens; the converging lens is located on the bottom plate and is surrounded by the frame; Alternatively, the converging lens is fixed to the frame, and the converging lens is configured to seal the light outlet.

22. The laser according to any one of claims 1 to 21, further comprising a heat sink; the first light-emitting chip is located on a surface of the heat sink away from the base plate, or on a surface of the heat sink perpendicular to the base plate.

23. A projection light source, wherein: The projection light source includes the laser according to any one of claims 1 to 22.

24. The projection light source according to claim 23, wherein: The projection light source further includes at least one of a light combining component, a second light uniforming component and a third collimating lens; the light combining component, the second light uniforming component or the third collimating lens is located in the target direction of the laser.

25. A projection device, wherein: The projection device comprises the projection light source according to claim 23 or 24, as well as a light valve and a lens; The light valve is configured to modulate the laser light emitted by the projection light source and then emit it toward the lens, and the lens is configured to project the received laser light to form a projection image.

Images