Light source assembly and projection device

Abstract

A light source assembly and a projection device, the light source assembly (10) comprising: a laser (101), wherein a first light-emitting area (Y1) emits first laser light, and a second light-emitting area (Y2, Y21, Y22) emits second laser light with a divergence angle smaller than that of the first laser light; a first light-combining lens group (102) configured to reflect the first laser light to an exit opening of the light source assembly (10); and a second light-combining lens group (103) comprising m light-combining lenses arranged in sequence along a light-emitting direction of the second light-emitting area (Y2, Y21, Y22), wherein a gap is present between an i-th light-combining lens and an (i+1)-th light-combining lens in the m light-combining lenses, m is greater than or equal to 2, and 1 is less than or equal to i and greater than or equal to m-1; wherein the i-th light-combining lens comprises a reflection area (a1, a2, a3) and a transmission area (b1, b2, b3), the reflection area (a1, a2, a3) is configured to reflect the incident second laser light to the exit opening, and the transmission area (b1, b2, b3) is configured to transmit the incident second laser light to the (i+1)-th light-combining lens; and the m-th light-combining lens is configured to reflect the incident second laser light to the exit opening.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202010641579.5, filed on July 6, 2020, entitled "Light Source Assembly and Projection Device", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of projection display technology, and in particular to a light source component and a projection device. Background Technology

[0004] With the development of display technology, the requirements for the display effect of the projected image from projection devices are becoming increasingly higher. Projection devices include a light source component, which provides the light required to form the projected image, and the higher the uniformity of the light, the better the display effect of the projected image. Summary of the Invention

[0005] One embodiment of this application provides a light source assembly, including:

[0006] A laser has a first emitting region and a second emitting region; the first emitting region is used to emit a first laser, and the second emitting region is used to emit a second laser, wherein the divergence angle of the first laser is greater than the divergence angle of the second laser.

[0007] The first light-combining lens group is located on the light-emitting side of the first light-emitting area and is used to reflect the first laser emitted from the first light-emitting area to the light-emitting port of the light source assembly.

[0008] The second beam combining lens group is located on the light-emitting side of the second light-emitting region. The second beam combining lens group includes m beam combining lenses arranged sequentially along the light-emitting direction of the second light-emitting region. There is a gap between the i-th beam combining lens and the (i+1)-th beam combining lens, where m ≥ 2 and 1 ≤ i ≤ m-1. The i-th beam combining lens includes a reflection area and a transmission area. The reflection area is used to reflect the incident second laser to the light-emitting port, and the transmission area is used to transmit the incident second laser to the (i+1)-th beam combining lens. The m-th beam combining lens is used to reflect the incident second laser to the light-emitting port.

[0009] In another aspect, this application provides a projection device, including: the aforementioned light source component, optical engine, and lens; the light source component is used to emit light to the optical engine, the optical engine is used to converge the light emitted by the light source component to the lens, and the lens is used to project the light converged by the optical engine. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a structural diagram of a projection device provided by related technologies;

[0012] Figure 2 This is a schematic diagram of the structure of a light source assembly provided in an embodiment of this application;

[0013] Figure 3 This is a schematic diagram of the structure of a second beam combining lens group provided in an embodiment of this application;

[0014] Figure 4 This is a schematic diagram of the structure of an MCL-type laser provided in an embodiment of this application;

[0015] Figure 5 This is a schematic diagram of another light source component provided in an embodiment of this application;

[0016] Figure 6 This is a schematic diagram of another second optical combining lens group provided in an embodiment of this application;

[0017] Figure 7 This is a partial structural schematic diagram of a light source assembly provided in an embodiment of this application;

[0018] Figure 8 This is a schematic diagram of another light source assembly provided in an embodiment of this application;

[0019] Figure 9 This is a schematic diagram of the structure of a projection device provided in an embodiment of this application. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0021] Figure 1 This is a structural schematic diagram of a light source component provided by related technologies. For example... Figure 1 As shown, the light source assembly 00 includes: a laser 001, a first beam combining lens J1, a second beam combining lens J2, a third beam combining lens J3, and a converging lens 003, with the converging lens 003 located at the light outlet of the light source assembly 00. The laser 001 has a beam combining direction along the target direction (e.g., ...). Figure 1The light-emitting regions Q3, Q2, and Q1 are arranged sequentially along the x-direction of the laser 001. This target direction is perpendicular to the light-emitting direction of the laser 001 (e.g., in the x-direction). Figure 1 (in the y-direction). Light-emitting region Q1 emits red laser light, light-emitting region Q2 emits blue laser light, and light-emitting region Q3 emits green laser light. The first beam combining lens J1 is located on the light-emitting side of the first light-emitting region Q1, the second beam combining lens J2 is located on the light-emitting side of the light-emitting region Q2, and the third beam combining lens J3 is located on the light-emitting side of the third light-emitting region Q3. The third beam combining lens J3, the second beam combining lens J2, the first beam combining lens J1, and the converging lens 003 are arranged sequentially along the x-direction. The red laser light emitted from light-emitting region Q1 can be directed towards the first beam combining lens J1, reflected off the first beam combining lens J1, and then directed towards the converging lens 003. The blue laser light emitted from light-emitting region Q2 can be directed towards the second beam combining lens J2, reflected off the second beam combining lens J2, and then directed through the first beam combining lens J1 towards the converging lens 003. The green laser emitted from the light-emitting region Q3 can be directed towards the third beam-combining lens J3, and after being reflected by the third beam-combining lens J3, it passes sequentially through the second beam-combining lens J2 and the first beam-combining lens J1 before reaching the converging lens 003. This achieves the mixing and convergence of the green, blue, and red lasers emitted by the laser 001 at the converging lens 003. Furthermore, a projected image can be projected based on this mixed laser.

[0022] However, because the divergence angle of the red laser emitted by laser 001 is greater than that of the green and blue lasers, the spot size formed by the red laser on the converging lens 003 is larger than that formed by the green and blue lasers. This results in a more pronounced boundary between the inner and outer color rings on the spot distribution on the converging lens 003. For example, the spot might be circular, with the outermost ring being red, followed by concentric circles of purple, blue, etc., moving inwards. Consequently, the uniformity of the laser converged by the converging lens 003 is poor, leading to a poor display effect for the projected image.

[0023] The following embodiments of this application provide a light source assembly and a projection device. The light source assembly can emit laser light with high uniformity, thereby improving the display effect of the projected image formed based on the laser light.

[0024] Figure 2 This is a schematic diagram of the structure of a light source assembly provided in an embodiment of this application. For example... Figure 2 As shown, the light source assembly 10 may include: a laser 101, a first beam combining lens group 102, and a second beam combining lens group (such as the second beam combining lens groups 103a and 103b).

[0025] The laser 101 has a first light-emitting region Y1 and a second light-emitting region. Figure 2The following is an example of a laser 101 having two second emitting regions Y21 and Y22. The first emitting region Y1 is used to emit the first laser, and the second emitting region is used to emit the second laser. The divergence angle of the first laser is greater than that of the second laser.

[0026] The first beam combining lens group 102 is located on the light-emitting side of the first light-emitting region Y1. The first beam combining lens group 102 is used to reflect the first laser emitted from the first light-emitting region Y1 to the light-emitting port K of the light source assembly 00.

[0027] The second beam combining lens group is located on the light-emitting side of the second light-emitting region. For example, the second beam combining lens group 103a is located on the light-emitting side of the corresponding second light-emitting region Y21, and the second beam combining lens group 103b is located on the light-emitting side of the corresponding second light-emitting region Y22. The second beam combining lens group in this embodiment will be described below using the second beam combining lens group 103a as an example. The second beam combining lens group 103a may include elements along the light-emitting direction of the second light-emitting region (e.g., ...). Figure 2 m combining lenses arranged sequentially in the y-direction (as shown in the image), the i-th combining lens P among these m combining lenses... i With the (i+1)th combining lens P i+1 There are gaps between them, m≥2, 1≤i≤m-1. Figure 2 The diagram is illustrated using m=2 as an example. Here, the i-th combining lens P... i It can include reflective and transmissive areas. Figure 3 This is a schematic diagram of the structure of a second light-combining lens group provided in an embodiment of this application. Figure 3 The second combining lens group 103a shown can be Figure 2 The left view of the second combining lens group 103a shown. Figure 3 As shown, the reflection region of the first beam combining lens P1 in the second beam combining lens group 103a may include reflection region a11, reflection region a12, reflection region a13, and reflection region a14, and the transmission region of the first beam combining lens P1 may include transmission region b11, transmission region b12, and transmission region b13. Each reflection region is used to reflect the incident second laser to the light outlet K of the light source assembly 10, and each transmission region is used to transmit the incident second laser to the (i+1)th beam combining lens P. i+1 The m-th combining lens P in the second combining lens group 103 m This is used to reflect the incoming second laser beam to the output port K. It should be noted that, for illustrative purposes only, Figure 2 Only a few light transmission paths are schematically shown; the light rays directed toward each reflection and transmission area are not shown in detail.

[0028] In one specific implementation, the various light-combining lens groups and the light-emitting port can be arranged in the target direction (e.g., Figure 2(in the x-direction). The i-th combining lens P of the second combining lens group. i The arrangement of the transmission and reflection regions can be perpendicular to the laser's output direction (y-direction) and also perpendicular to the target direction. For example... Figure 3 The transmission and reflection regions in the combined light lens P1 can be arranged in the z-direction, which can be... Figure 2 The z-direction is perpendicular to the plane of the paper, and this z-direction is perpendicular to both the x and y directions. For example, a beam combining lens can have a length direction and a width direction. Figure 3 The z-direction can be the length direction of the beam combining lens, and the transmission and reflection areas in the lens can be arranged along this length direction. In one specific embodiment, the transmission and reflection areas in the lens can also be arranged along the width direction. The beam combining principle of this type of lens is the same as... Figure 3 The light-combining principle of the light-combining lenses shown is the same, and will not be repeated in the embodiments of this application.

[0029] In a projection device, the various components of the light source assembly 10 can be encapsulated in a housing. This housing of the light source assembly 10 can have a light-emitting port K, through which the light source assembly 10 transmits light to the optical engine of the projection device. In this embodiment, the light-emitting port K of the housing is referred to as the light-emitting port K of the light source assembly 10. The laser 101 in the light source assembly 10 can emit laser light of multiple colors to be transmitted to the light-emitting port K. The multiple light-emitting regions in the laser 101 can be multiple regions on the light-emitting surface of the laser 101. In one specific implementation, the colors of the laser emitted by different light-emitting regions can be different. The laser 101 can have only one light-emitting direction (e.g., ...). Figure 2 The light emission direction of each emitting region in laser 101 is the same as the light emission direction of laser 101. Since the laser transmitted to the output port K needs to be a mixture of multiple colors emitted by laser 101, and there are certain requirements for the spot size of the laser transmitted to output port K, output port K is not directly located in the light emission direction of laser 101. A beam combining lens is also provided between laser 101 and output port K to adjust and mix the laser emitted by laser 101 before transmitting it to output port K. For example, each emitting region of laser 101 has a beam combining lens group on its emission side to reflect the laser emitted by the corresponding emitting region to output port K.

[0030] like Figure 2As shown in the illustration, this embodiment of the application illustrates an example where a first beam combining lens group 102 is provided on the light-emitting side of the first light-emitting region Y1, and the first beam combining lens group 102 includes only one beam combining lens. In a specific implementation, the first beam combining lens group 102 may also include multiple beam combining lenses. For example, the orthographic projections of the multiple beam combining lenses onto the first light-emitting region have no overlapping areas, or the surfaces of the multiple beam combining lenses used to reflect the first laser can be coplanar.

[0031] In this embodiment, a second beam combining lens group is provided on the light-emitting side of the second light-emitting region. The second beam combining lens group includes two beam combining lenses arranged sequentially along the y-direction (belonging to beam combining lens P1 and beam combining lens P2), i.e., m=2. Among the m beam combining lenses in the second beam combining lens group, the first beam combining lens P1 is the beam combining lens closest to the second light-emitting region, and the m-th beam combining lens P... m This is the beam combining lens furthest from the second emitting region. The second laser emitted from the second emitting region can be directed towards the corresponding group of second beam combining lenses. Since the first m-1 beam combining lenses among the m beam combining lenses have both transmission and reflection regions, the second laser can pass through the first beam combining lens among the m beam combining lenses (i.e., the i-th beam combining lens P). i The transmission region in the i-th beam combiner is directed towards the next beam combiner (i.e., the i-th beam combiner P). i+1 The second laser can be reflected by any reflecting area in the beam combining lens when it is directed towards that area, and then returned to the output port K. When the second laser is directed towards the m-th beam combining lens, it can be directly reflected by that m-th beam combining lens to the output port K. Please refer to... Figure 2 and Figure 3 The second laser emitted from the second light-emitting region is directed to the four transmission areas in the first light-combining lens P1 and then to the second light-combining lens P2. It is then reflected by the light-combining lens P2 and directed to the light-emitting port K. The second laser emitted to the three reflection areas in the first light-combining lens P1 is directly reflected and directed to the light-emitting port K.

[0032] In the second beam combining lens group, there is a gap between the i-th beam combining lens and the (i+1)-th beam combining lens, meaning there is a gap between any two adjacent beam combining lenses in the y-direction. Therefore, the second laser emitted from the second light-emitting region, after passing through the i-th beam combining lens, travels a certain optical path before being directed towards the (i+1)-th beam combining lens, and is then reflected by the (i+1)-th beam combining lens to the light exit port K. Thus, the second laser directed towards the light exit port K covers the area from the first beam combining lens to the m-th beam combining lens, and the light spot formed by the second laser at the light exit port K is relatively large.

[0033] contrast Figure 1 and Figure 2As can be seen from the light source assembly, in related technologies, the laser beams emitted from the light-emitting regions Q2 and Q3 are directly reflected on a beam combining mirror to be directed towards the light exit port. This laser beam is relatively thin, resulting in a small spot at the light exit port, and is mostly concentrated at the center of the light exit port. However, in the light source assembly provided in this application embodiment, the second laser beam can be reflected on multiple beam combining mirrors with gaps between them to be directed towards the light exit port. This allows the thinner second laser beam to be split into multiple beams before being directed towards the light exit port. These multiple second laser beams can occupy a larger area for transmission, resulting in a larger spot at the light exit port, with a smaller size difference from the spot formed by the first laser beam.

[0034] In summary, in the light source assembly provided in this application embodiment, the second beam combining lens group is located on the light-emitting side of the second light-emitting region of the laser, and the multiple beam combining lenses in the second beam combining lens group are arranged along the light-emitting direction of the second light-emitting region with gaps between adjacent beam combining lenses. The beam combining lens before the last beam combining lens in the second beam combining lens group includes a transmission region and a reflection region. The second laser beam directed towards the reflection region can be directly reflected by the reflection region to the light-emitting port. The second laser beam directed towards the transmission region can pass through the transmission region and be directed towards the next beam combining lens. The second laser beam directed towards the last beam combining lens can be reflected to the light-emitting port. In this way, the second laser beam emitted from the second light-emitting region of the laser can be directed towards the light-emitting port from multiple beam combining lenses with gaps between them. The second laser beam directed towards the light-emitting port can cover a large area, and the light spot formed by the second laser beam at the light-emitting port can be large. Even if the divergence angle of the first laser emitted from the first emitting region is large, resulting in a large spot at the light outlet, the present application can ensure that the size difference between the spot formed by the second laser and the spot formed by the first laser is small through the multiple light combining lenses in the second light combining lens group, thereby ensuring that the laser obtained by mixing the first laser and the second laser at the light outlet has high uniformity.

[0035] In addition, because the laser emitted by this light source component has high uniformity, projection devices using this light source component can form a projection image with better display effect based on the high uniformity of the laser.

[0036] In this embodiment, the laser 101 may have at least two light-emitting regions. When the laser has multiple second light-emitting regions and the light source assembly includes multiple second beam combining lens groups, each second beam combining lens group corresponds to one second light-emitting region, and different second beam combining lens groups correspond to different second light-emitting regions. Each second beam combining lens group is located on the light-emitting side of the corresponding second light-emitting region. Figure 2The following is an example illustrating a laser 101 having a first emitting region Y1 and two second emitting regions Y21 and Y22. In one specific embodiment, the laser 101 may have only one second emitting region, or the laser 101 may have three or more second emitting regions, or the laser 101 may have multiple first emitting regions. This application does not limit the specific embodiment.

[0037] In this embodiment of the application, the divergence angle of the laser emitted from any second light-emitting region may be smaller than the divergence angle of the laser emitted from any first light-emitting region. For example, Figure 2 The first emitting region Y1 can emit red laser light, the second emitting region Y21 can emit green laser light, and the second emitting region Y22 can emit blue laser light. The divergence angles of the blue and green lasers can both be smaller than the divergence angle of the red laser. Alternatively, assuming that the divergence angles of the red and blue lasers emitted by the laser are both greater than the divergence angle of the green laser, then the emitting regions emitting red and blue lasers can both be designated as the first emitting region, while only the emitting region emitting green laser light can be designated as the second emitting region. Furthermore, the second beam combining lens group can be placed only on the light-emitting side of the emitting region emitting green laser light.

[0038] The laser 101 in the light source assembly 10 provided in this application embodiment can be a multi-chip laser diode (MCL) type laser. Figure 4 This is a schematic diagram of the structure of an MCL-type laser provided in an embodiment of this application. Figure 2 The laser 101 shown can be Figure 4 A schematic diagram of the cross-section d-d' of the laser 101 after it has been flipped. (See diagram below.) Figure 4 As shown, an MCL-type laser may include multiple light-emitting chips arranged in an array within the same housing G. Figure 3 (Not shown), each light-emitting chip can emit laser light independently, and the laser light emitted by each chip can be projected out through its corresponding collimating lens T. For example... Figure 4 The laser 101 shown may include 24 light-emitting chips arranged in 6 rows and 4 columns, wherein the first light-emitting region Y1 may include Figure 4The rightmost two columns of light-emitting chips are located in the area. The second light-emitting area Y21 can include the area where the leftmost column of light-emitting chips is located, and the second light-emitting area Y22 can include the area where the second column of light-emitting chips is located. Since the MCL type laser is small in size and emits high brightness laser light, the light source component provided in this application embodiment can reduce the size of the light source component by using this laser, which is beneficial to the miniaturization of the projection device. It should be noted that, in this application embodiment, the laser 101 can include 24 light-emitting chips arranged in 6 rows and 4 columns as an example. The laser 101 can also include 20 light-emitting chips arranged in 4 rows and 5 columns, or 15 light-emitting chips arranged in 3 rows and 5 columns, or 14 light-emitting chips arranged in 2 rows and 7 columns. This application embodiment does not limit the scope.

[0039] Please continue to refer to this. Figure 2 Each light-emitting area in the light source assembly 10 can emit light along the target direction (i.e., Figure 2 The light-emitting areas are arranged in the x-direction, and thus each beam-combining lens group can also be arranged along the target direction. Since the beam-combining lens group needs to reflect the incident laser to the light-emitting port, each beam-combining lens group and the light-emitting port can be arranged in the target direction. This target direction can intersect with the light-emitting direction of the laser 101, such as being perpendicular to the light-emitting direction of the laser 101, or forming an acute or obtuse angle with the light-emitting direction of the laser 101. In one specific embodiment, the light-emitting areas can also be randomly arranged, arranged in a circle, or arranged in other ways; this application embodiment does not limit this.

[0040] In this embodiment, the light source assembly 10 includes at least two beam combining lens groups, and each beam combining lens group and the light output port can be arranged in the target direction. Therefore, there may be a beam combining lens group located between the light output port and another beam combining lens group. For this beam combining lens group to direct the reflected laser towards the light output port, it is necessary to ensure that the laser passes through the other beam combining lens group. Therefore, the beam combining lens group located between the light output port and any beam combining lens group in the light source assembly is also used to transmit the laser emitted by that beam combining lens group.

[0041] For example, Figure 2The second beam combining lens group Y22 is located between the second beam combining lens group Y21 and the light exit port K. Therefore, the second beam combining lens group Y22 can also be used to transmit the laser emitted from the second beam combining lens group Y21 (such as a green laser). That is, the beam combining lenses in the second beam combining lens group Y22 are used to transmit the green laser. The first beam combining lens group Y1 is located between the second beam combining lens group Y21 and the light exit port K, and also between the second beam combining lens group Y22 and the light exit port K. Therefore, the first beam combining lens group Y1 can also be used to transmit the laser emitted from the second beam combining lens group Y21 (such as a green laser) and the laser emitted from the second beam combining lens group Y22 (such as a blue laser). That is, the beam combining lenses in the first beam combining lens group Y1 are also used to transmit the green and blue lasers. Therefore, the second beam combining lens group Y21 can reflect the green laser, the second beam combining lens group Y22 can reflect the blue laser and transmit the green laser, and the first beam combining lens group Y1 can reflect the red laser and transmit the green and blue lasers.

[0042] The second beam combining lens group in the light source assembly is described below with reference to the accompanying drawings:

[0043] In this embodiment of the application, the m combining lenses of the second beam combining lens group and the light emission direction of the second light emitting region (e.g., Figure 2 The y-direction of the beam combining lenses can intersect. For example, if the light-receiving surface of the laser emitted from the second emitting region by the m beam combining lenses intersects with the emitting direction, then the light-receiving surface of the beam combining lens is the surface of the beam combining lens closest to the second emitting region. In one specific embodiment, the m beam combining lenses of the second beam combining lens group can be parallel, such as the light-receiving surfaces of the m beam combining lenses being parallel to the laser emitted from the second emitting region. It should be noted that each beam combining lens in the second beam combining lens group can be a plate-like structure, and the plate-like structure has two parallel larger plate surfaces and multiple smaller side surfaces connecting the two plate surfaces. The light-receiving surface is the plate surface of the two plate surfaces closest to the second emitting region. Since the beam combining lens is relatively thin, it can be regarded as a plane, so it can also be directly said that the beam combining lens intersects with the emitting direction, and the m beam combining lenses are parallel. In one specific embodiment, the angle between the beam combining lens of the second beam combining lens group and the emitting direction of the second emitting region can be in the range of 43 degrees to 45 degrees. In one specific implementation, the angle between the beam combining lens in the first beam combining lens group and the light output direction of the laser can also be in the range of 43 degrees to 45 degrees.

[0044] In this embodiment, among the m beam combining lenses of the second beam combining lens group, at least the first beam combining lens includes multiple reflective areas and multiple transmissive areas, and the reflective areas and transmissive areas can be alternately arranged. For example, please refer to... Figure 3The first beam combining lens P1 in the second beam combining lens group 103a includes a reflection region a1, a transmission region b1, a reflection region a2, a transmission region b2, a reflection region a3, a transmission region b3, and a reflection region a4 arranged sequentially along the z-direction. This allows the laser beam emitted from the second emitting region to be split into multiple beams occupying a larger area for emission. The alternating arrangement of transmission and reflection regions ensures a uniform distribution of the laser reflected from each beam combining lens, thus guaranteeing a relatively uniform distribution of the laser emitted from each beam combining lens. In one specific embodiment, when m ≥ 3, in addition to the first beam combining lens, other beam combining lenses (such as a second beam combining lens) may also exist, including multiple reflection and transmission regions. In another specific embodiment, the areas of each transmission and reflection region can be the same to further ensure a relatively uniform distribution of the laser emitted from each beam combining lens.

[0045] It should be noted that, Figure 2 Taking the second combining lens group, which includes two combining lenses (i.e., m=2), as an example, and Figure 3 Taking the first beam combining lens as an example, which includes four reflective areas and three transmissive areas, with both ends of the first beam combining lens being reflective areas. In one specific embodiment, the second beam combining lens group may also include three, four, or even more beam combining lenses. The number of reflective areas in the first beam combining lens may also be three, five, or other numbers, and the number of transmissive areas may also be two, three, or other numbers. Both ends of the first beam combining lens may also be transmissive areas, in which case the number of transmissive areas in the first beam combining lens is greater than the number of reflective areas. Alternatively, the first beam combining lens may have one end as a transmissive area and the other end as a reflective area, in which case the number of transmissive and reflective areas in the first beam combining lens is the same. The areas of each transmissive and reflective area may also be different, and this application does not limit this.

[0046] In one specific implementation, the number of transmission and reflection regions in the second beam combining lens group can be related to the number and arrangement of light-emitting chips in the second light-emitting region. For example, the sum of the number of transmission and reflection regions in the first beam combining lens of the second beam combining lens group is equal to the number of light-emitting chips arranged in a certain direction in the second light-emitting region, and the arrangement direction of the transmission and reflection regions is parallel to the arrangement direction of the light-emitting chips in the second light-emitting region. For example, in this embodiment, the laser may include light-emitting chips arranged in 4 rows and 7 columns. The second laser emitted from the second light-emitting region can be emitted by 7 light-emitting chips in one column of the laser, thus splitting the laser beam emitted from the second light-emitting region into 7 beams. If the sum of the number of transmission and reflection regions in the first beam combining lens of the second beam combining lens group is 7, it can be ensured that the laser emitted by each light-emitting chip is directed towards a transmission or reflection region. For another example, if the 7 light-emitting chips are arranged in the z-direction, the transmission and reflection regions of the beam combining lens of the second beam combining lens group can also be arranged in the z-direction.

[0047] In an optional embodiment, the number of beam combining lenses in the second beam combining lens group is greater than 2, i.e., m ≥ 3. In this case, the j-th beam combining lens among the m beam combining lenses can have a first transmission region, and the (j+1)-th beam combining lens can have a second transmission region corresponding to the first transmission region, where 1 ≤ j < m-1. On the second light-emitting region, the orthographic projection of the first transmission region at least partially overlaps with the orthographic projection of the second transmission region corresponding to the first transmission region, thereby ensuring that the first transmission region can direct at least a portion of the incident second laser beam towards the second transmission region corresponding to the first transmission region.

[0048] Figure 5 This is a schematic diagram of another light source component provided in an embodiment of this application, and Figure 5 The explanation will be based on an example where the laser 101 in the light source assembly 10 has two light-emitting regions, and the second beam combining lens group includes three beam combining lenses, i.e., m=3. Figure 5 As shown, the laser 101 has a first light-emitting region Y1 and a second light-emitting region Y2, and the second beam combining lens group 103 includes three beam combining lenses P1, P2 and P3. Figure 6 This is a schematic diagram of another second optical combining lens group provided in the embodiments of this application. Figure 6 The second combining lens group 103 shown can be Figure 5 The left view of the second beam combining lens group 103 is shown. The first beam combining lens P1 includes a transmission region b1, a reflection region a1, a transmission region b2, a reflection region a2, and a transmission region b3 arranged along the z-direction; the second beam combining lens P2 includes a reflection region a3, a transmission region b4, and a reflection region a4 arranged along the target direction. The transmission region b2 can be a first transmission region, and the transmission region b4 can be a second transmission region corresponding to the transmission region b2. The orthographic projection of the transmission region b2 onto the second light-emitting region Y2 at least partially overlaps with the orthographic projection of the transmission region b4 onto the second light-emitting region Y2, such that the orthographic projection of the transmission region b2 onto the second light-emitting region Y2 covers a portion of the orthographic projection of the transmission region b4 onto the second light-emitting region Y2. In this embodiment, the light-emitting region of the laser includes a light-emitting surface perpendicular to its light-emitting direction (i.e., the y-direction), so the orthographic projection of the transmission region onto the second light-emitting region is the same as the orthographic projection of the transmission region onto a plane perpendicular to the y-direction.

[0049] Thus, the second laser emitted from the second emitting region Y2 can be directed towards the first beam combining lens P1. The second laser beam directed towards the transmission region b1 of beam combining lens P1 passes through transmission region b1 and is directed towards the reflection region a3 of the second beam combining lens P2, where it is reflected to the exit port K. Similarly, the second laser beam directed towards transmission region b3 passes through transmission region b3 and is directed towards the reflection region a4 of the second beam combining lens P2, where it is reflected to the exit port K. The second laser beam directed towards transmission region b2 of beam combining lens P1 passes through transmission region b2 and is directed towards transmission region b4 of the second beam combining lens P2, where it continues to pass through transmission region b4 and is directed towards the third beam combining lens P3, where it is reflected to the exit port K. Therefore, the second laser beam emitted from the second emitting region Y2 can be split by the three beam combining lenses, allowing the second laser beam to be emitted from each of the three lenses separately, thereby expanding the transmission range of the second laser beam and resulting in a larger spot size of the second laser beam at the exit port K.

[0050] Figure 4 Taking the example that the size of transmission region b2 is smaller than the size of transmission region b4, and the orthographic projection area of ​​transmission region b2 on the second light-emitting region Y2 is smaller than the orthographic projection area of ​​transmission region b4 on the second light-emitting region Y2; this embodiment does not limit the size relationship between transmission region b2 and transmission region b4. In an optional example, the sizes of transmission region b2 and transmission region b4 can be the same, and the orthographic projections of transmission region b2 and transmission region b4 on the second light-emitting region Y2 can completely coincide. In another optional example, the size of transmission region b2 can be larger than the size of transmission region b4, and the orthographic projection area of ​​transmission region b4 on the second light-emitting region Y2 can be larger than the orthographic projection area of ​​transmission region b2 on the second light-emitting region Y2. In this case, a portion of the second laser beam emitted from transmission region b2 toward the second beam combining lens P2 passes through transmission region b4 and is emitted toward the third beam combining lens P3, while another portion can be emitted toward the reflection region a3 or a4 of the second beam combining lens P2, and then reflected on the reflection region a3 or a4 of the second beam combining lens P2. The arrangement of the transmission and reflection zones in each beam combining lens can be flexibly configured as needed. It is only necessary to ensure that the second laser beam passing through the transmission zone of the preceding beam combining lens can be reflected on the subsequent beam combining lens; this application does not impose any limitations on this. In one specific implementation, the number of reflection zones in the subsequent beam combining lens out of m beam combining lenses can be less than or equal to the number of transmission zones in the preceding beam combining lens.

[0051] In one optional embodiment, the light source assembly includes multiple second light-emitting regions and multiple second beam-combining lens groups. For any two of these second beam-combining lens groups: on a plane perpendicular to the target direction, the orthographic projection of the target reflective region and the target transmissive region at least partially coincide. The target reflective region belongs to a beam-combining lens group of the second beam-combining lens group farther from the light exit port, and the target transmissive region belongs to a beam-combining lens group of the second beam-combining lens group closer to the light exit port. The target reflective region can reflect the incident second laser to the target transmissive region, allowing the second laser to pass through the target transmissive region and reach the light exit port. Thus, the transmissive and reflective regions in the two beam-combining lens groups are interleaved. In one specific implementation, the number of transmissive regions in one beam-combining lens group is equal to the number of reflective regions in the other beam-combining lens group.

[0052] For example, Figure 7 This is a partial structural schematic diagram of a light source component provided in an embodiment of this application. Figure 7 for Figure 2 The image shows a bottom view of the first beam combining lens in the second beam combining lens groups 103a and 103b of the light source assembly, the first beam combining lens group 102, and the light outlet K. Please refer to the image. Figure 2 and Figure 7 For the two second beam combining lens groups 103a and 103b, second beam combining lens group 103a is farther from the light exit port K, and second beam combining lens group 103b is closer to the light exit port K. The reflection area in second beam combining lens group 103a is the target reflection area, and the transmission area in second beam combining lens group 103b is the target transmission area. On a plane perpendicular to the target direction (x direction), the orthographic projection of the reflection area in the beam combining lens of second beam combining lens group 103a coincides with the orthographic projection of the transmission area in the beam combining lens of second beam combining lens group 103b. For example, the first beam combining lens in second beam combining lens group 103a includes four reflection areas and three transmission areas, and the first beam combining lens in second beam combining lens group 103b includes three reflection areas and four transmission areas. Figure 7As shown, the first beam combining lens in the second beam combining lens group 103a includes a reflection region a11, a transmission region b11, a reflection region a12, a transmission region b12, a reflection region a13, a transmission region b13, and a reflection region a14 arranged along the z-direction. The first beam combining lens in the second beam combining lens group 10b includes a transmission region b21, a reflection region a21, a transmission region b22, a reflection region a22, a transmission region b23, a reflection region a23, and a transmission region b24 arranged along the z-direction. Reflection zone a11 can reflect the second laser emitted by the second light-emitting area Y21 to the transmission zone b21, and then pass through the transmission zone b21 to the light outlet K; reflection zone a12 can reflect the second laser emitted by the second light-emitting area Y21 to the transmission zone b22, and then pass through the transmission zone b22 to the light outlet K; reflection zone a13 can reflect the second laser emitted by the second light-emitting area Y21 to the transmission zone b23, and then pass through the transmission zone b23 to the light outlet K; reflection zone a14 can reflect the second laser emitted by the second light-emitting area Y21 to the transmission zone b24, and then pass through the transmission zone b24 to the light outlet K.

[0053] In the embodiments of this application, when the light source component includes multiple second beam combining lens groups, the number of beam combining lenses in each second beam combining lens group can be the same or different, and the area of ​​the beam combining lenses in each second beam combining lens group can be the same or different. The embodiments of this application do not impose any limitations.

[0054] In this embodiment, the function of the second beam combining lens group can be achieved in the following manner:

[0055] In a first optional implementation, the i-th beam combining lens in the second beam combining lens group includes: a light-transmitting substrate and a dichroic film attached to the light-transmitting substrate. The i-th beam combining lens utilizes the function of the dichroic film to transmit and reflect laser light of a fixed wavelength. The dichroic film in the transmission region of the i-th beam combining lens is used to transmit a second laser light emitted from the second emitting region corresponding to the second beam combining lens group. The dichroic film in the reflection region of the i-th beam combining lens is used to reflect the second laser light emitted from the second emitting region corresponding to the second beam combining lens group. The dichroic films in the transmission and reflection regions can also transmit laser light emitted from other beam combining lenses located on the side of the i-th beam combining lens away from the light exit port. For example, Figure 2 In the first lens of the second beam combining lens group 103a, the dichroic film in the reflective region can reflect green light, and the dichroic film in the transmissive region can transmit green light; in the first lens of the second beam combining lens group 103b, the dichroic film in the reflective region can transmit green light and reflect blue light, and the dichroic film in the transmissive region can transmit both green and blue light.

[0056] In a second alternative implementation, the i-th beam combining lens in the second beam combining lens group includes a light-transmitting substrate and a reflective coating on the light-transmitting substrate. The reflective area of ​​the i-th beam combining lens includes the region in the i-th beam combining lens where the reflective coating is disposed. This reflective coating is used to reflect the second laser emitted from the corresponding second light-emitting region. The transmissive area of ​​the i-th beam combining lens includes the region in the i-th beam combining lens where no reflective coating is disposed. This achieves the reflection of the incident second laser by the reflective area in the i-th beam combining lens and the transmission of the incident second laser by the transmissive area. In one specific implementation, when the reflective area of ​​the i-th beam combining lens does not need to transmit any wavelength of laser light, the reflective coating can reflect light of the entire wavelength range. When the reflective area of ​​the i-th beam combining lens also needs to transmit a certain wavelength of laser light, the reflective coating can have the function of transmitting laser light of that wavelength range. In this case, the function of the reflective coating is similar to that of a dichroic film.

[0057] In the third alternative implementation, the i-th beam combining lens in the second beam combining lens group includes multiple sub-lenses, each reflective region of the i-th beam combining lens includes one sub-lens, and the transmissive region of the i-th beam combining lens may not contain any material. The formation method of the sub-lens can refer to the formation method of the reflective region in the first and second alternative implementations described above.

[0058] In the second and third optional implementations described above, the transmission region can transmit light of all wavelengths, and the reflection region can reflect light of all wavelengths. In a specific embodiment, if the light source assembly includes multiple second beam combining lens groups in these two methods, the transmission and reflection regions in these multiple second beam combining lens groups can be designed using the aforementioned interleaving arrangement. In this way, light reflected by the reflection region in one second beam combining lens group can be directed to the light outlet through the transmission region in other second beam combining lens groups. Therefore, it is unnecessary to set a dichroic film in the transmission region, avoiding the increased manufacturing cost and cumbersome manufacturing process caused by setting dichroic films at various positions on the beam combining lenses of other second beam combining lens groups. Furthermore, the third optional implementation does not require any material in the transmission region, thus further reducing the manufacturing cost of the light source assembly.

[0059] In one specific implementation, for the m-th beam combining lens in the second beam combining lens group: one way to realize the function of the m-th beam combining lens can refer to the first optional implementation of the i-th beam combining lens described above. In another implementation, if a certain second beam combining lens group is the beam combining lens group farthest from the light outlet in the light source assembly, then the m-th beam combining lens in the second beam combining lens group can be a reflector that can reflect light of all wavelengths, such as a metal sheet (e.g., an aluminum sheet or a copper sheet). Alternatively, the structure of the m-th beam combining lens can also refer to the second optional implementation of the i-th beam combining lens described above.

[0060] The implementation method of the function of the combining lens in the first combining lens group can refer to the first optional implementation method mentioned above for the i-th combining lens. For example... Figure 2 The dichroic coating of the combining lens in the first combining lens group can be used to transmit green and blue light while reflecting red light.

[0061] Figure 8 This is a schematic diagram of another light source assembly provided in an embodiment of this application. For example... Figure 8 As shown, the light source assembly 10 may further include a housing 104. The laser 101, the first beam combining lens group 102, and the second beam combining lens group 103 described above can all be disposed in the accommodating cavity inside the housing 104.

[0062] In one specific embodiment, the light source assembly 10 may further include a phase retardation plate 105. This phase retardation plate 105 can be located on the light-emitting side of the second light-emitting region of the laser, and between the second light-emitting region and the second beam combining lens group 103. The second laser emitted from the second light-emitting region (such as a green or blue laser) can have its polarization direction adjusted by the phase retardation plate 105 before being directed towards the second beam combining lens group 103. Since the polarization directions of the lasers emitted from the first and second light-emitting regions are usually different, a phase retardation plate 105 can be provided on the light-emitting side of the second light-emitting region so that the polarization direction of the second laser passing through the phase retardation plate 105 is the same as the polarization direction of the first laser (such as a red laser). In one specific embodiment, the phase retardation plate 105 can be fixed inside the housing 104 by clamping with a clamping component, thus avoiding the phase retardation plate 105's fixing device from obstructing the light path. For example, the phase retardation plate 105 can be a half-wave plate. In one specific implementation, the light-emitting area emitting green laser is adjacent to the light-emitting area emitting blue laser, so only one half-wave plate needs to be set in the light source assembly 10 to adjust the phase of the green laser and the blue laser.

[0063] In this embodiment, an integrated base may also be provided in the accommodating cavity of the housing 104. Each beam combining lens group can be fixed by the integrated base to reduce the cumulative tolerance of multiple structural assemblies and to facilitate maintaining the same setting angle and relative positional relationship between each beam combining lens. In a specific implementation, the phase retardation film 105 can also be fixed by the integrated base.

[0064] In one specific embodiment, the light source assembly 10 may further include a converging lens 106. This converging lens 106 may be located at the light exit port K of the light source assembly 10. The laser light emitted from each emitting region of the laser 101 can be reflected by the corresponding beam combining lens group, thereby mixing into a single laser beam, which is then directed towards the converging lens 106 at the light exit port K of the light source assembly 10. The converging lens 106 can converge and reduce the received light spot before directing it towards an optomechanism, such as a light path shaping component within the optomechanism, which may include a light guide for homogenizing the light. The different colors of laser light emitted from each emitting region of the laser 10 can be mixed to obtain white light, and a white spot can be formed at the converging lens 106. Furthermore, due to the arrangement of the second beam combining lens group in this embodiment, the size difference of the individual spots formed by the different colors of laser light on the converging lens 106 is small, resulting in high uniformity of the white spot formed on the converging lens 106.

[0065] In one specific embodiment, the light source assembly 10 may further include a diffuser ( Figure 8 (Not shown), the diffuser can be located on the light exit path of the converging lens 106. The laser emitted from the light exit port is diffused by the diffuser before being incident on the beam shaping component. The diffuser can be a diffuser wheel structure, including a rotating diffuser plate. By diffusing the light through the rotation of the diffuser plate, speckle can be eliminated, thereby improving the quality of the light emitted by the light source assembly and reducing the speckle effect of the projected image.

[0066] In summary, in the light source assembly provided in this application embodiment, the second beam combining lens group is located on the light-emitting side of the second light-emitting region of the laser, and the multiple beam combining lenses in the second beam combining lens group are arranged along the light-emitting direction of the second light-emitting region with gaps between adjacent beam combining lenses. The beam combining lens before the last beam combining lens in the second beam combining lens group includes a transmission region and a reflection region. The second laser beam directed towards the reflection region can be directly reflected by the reflection region to the light-emitting port. The second laser beam directed towards the transmission region can pass through the transmission region and be directed towards the next beam combining lens. The second laser beam directed towards the last beam combining lens can be reflected to the light-emitting port. In this way, the second laser beam emitted from the second light-emitting region of the laser can be directed towards the light-emitting port from multiple beam combining lenses with gaps between them. The second laser beam directed towards the light-emitting port can cover a large area, and the light spot formed by the second laser beam at the light-emitting port can be large. Even if the divergence angle of the first laser emitted from the first emitting region is large, resulting in a large spot at the light outlet, the present application can ensure that the size difference between the spot formed by the second laser and the spot formed by the first laser is small through the multiple light combining lenses in the second light combining lens group, thereby ensuring that the laser obtained by mixing the first laser and the second laser at the light outlet has high uniformity.

[0067] Figure 9 This is a schematic diagram of the structure of a projection device provided in an embodiment of this application. For example... Figure 9 As shown, the projection device may include a light source assembly 10, an optical engine 20, and a lens 30. The light source assembly 10 emits light to the optical engine 20, which modulates the incoming light and directs it towards the lens 30, which then projects the incoming light. The light source assembly can be any of the aforementioned light source assemblies 10. Because the laser emitted by the light source assembly 10 has high uniformity, the projection device using this light source assembly can form a projected image with good display quality based on the highly uniform laser light.

[0068] In one specific implementation, the optomechanical system may include a light homogenizing component, a lens group, a total internal reflection prism (TIR) ​​prism group, and a light modulation component. Light rays emitted from the light source assembly pass sequentially through the light homogenizing component, the lens group, the TIR prism group, and the light modulation component before exiting through the lens. The light-emitting surface of the light homogenizing component and the light-incident surface of the light modulation device form a conjugate object-image relationship. The light modulation component can be a liquid crystal on silicon (LCOS), a liquid crystal display (LCD), or a digital micromirror device (DMD).

[0069] In this application, the term "and / or" merely describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " generally indicates that the preceding and following related objects have an "or" relationship. The term "at least one of A, B, and C" in this application indicates that seven relationships can exist, representing: A existing alone, B existing alone, C existing alone, A and B existing simultaneously, A and C existing simultaneously, C and B existing simultaneously, and A, B, and C existing simultaneously. In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more, unless otherwise explicitly defined.

[0070] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A light source assembly, characterized in that, The light source assembly includes: A laser has a first emitting region and a second emitting region; the light emission direction of each emitting region in the laser is the same as the light emission direction of the laser; the first emitting region is used to emit a first laser, the second emitting region is used to emit a second laser, and the divergence angle of the first laser is greater than the divergence angle of the second laser. The first beam combining lens group and the second beam combining lens group are located on the light-emitting side of the first light-emitting region and the second light-emitting region, respectively. The second beam combining lens group includes m beam combining lenses arranged sequentially along the light emission direction of the second light-emitting region. A gap exists between the i-th beam combining lens and the (i+1)-th beam combining lens, where m ≥ 2 and 1 ≤ i ≤ m-1. The i-th beam combining lens includes a reflection region and a transmission region. The reflection region reflects the incident second laser light to the light emission port, and the transmission region transmits the incident second laser light to the (i+1)-th beam combining lens. The m-th beam combining lens reflects the incident second laser light to the light emission port. Furthermore, the m-th beam combining lens is also used to reflect the second laser beam toward the first beam combining lens group; The first beam combining lens group is used to combine the first laser emitted from the first light-emitting area and the second laser reflected by the m-th beam combining lens and output the combined light to the light output port; The first beam combining lens group, the second beam combining lens group, and the light output port are arranged in the target direction, and the target direction intersects with the light output direction of the laser. The beam combining lens group located between the light outlet and any beam combining lens group is also used for: transmitting laser light emitted by any beam combining lens group; The light source assembly includes a plurality of second light-emitting regions and a plurality of second light-combining lens groups; each second light-combining lens group corresponds to one second light-emitting region, and different second light-combining lens groups correspond to different second light-emitting regions, with each second light-combining lens group located on the light-emitting side of the corresponding second light-emitting region; For any two of the second beam combining lens groups: on a plane perpendicular to the target direction, the orthographic projection of the target reflective area and the orthographic projection of the target transmissive area at least partially coincide; Wherein, the target reflection area belongs to the beam combining lens of the second beam combining lens group that is far from the light outlet, and the target transmission area belongs to the beam combining lens of the second beam combining lens group that is close to the light outlet; the target reflection area is used to: reflect the incident second laser to the target transmission area, so that the second laser passes through the target transmission area and is directed toward the light outlet.

2. The light source assembly according to claim 1, characterized in that, The first beam combining lens group is a beam combining lens, and / or, The first of the m combining lenses includes multiple reflective areas and multiple transmissive areas, with the reflective areas and transmissive areas alternately arranged.

3. The light source assembly according to claim 1, characterized in that, The m≥3; The j-th combining lens among the m combining lenses has a first transmission region, and the (j+1)-th combining lens has a second transmission region corresponding to the first transmission region, where 1 ≤ j < m-1; on the second light-emitting region, the orthographic projection of the first transmission region and the orthographic projection of the second transmission region corresponding to the first transmission region at least partially overlap. The first transmission region is used to direct at least a portion of the incident second laser beam toward the second transmission region corresponding to the first transmission region.

4. The light source assembly according to any one of claims 1 to 3, characterized in that, The i-th light-combining lens includes a light-transmitting substrate and a reflective coating located on the light-transmitting substrate. The reflective area includes the region in the i-th light-combining lens where the reflective coating is disposed, and the transmissive area includes the region in the i-th light-combining lens where the reflective coating is not disposed.

5. The light source assembly according to any one of claims 1 to 3, characterized in that, The i-th light-combining lens includes: a light-transmitting substrate and a dichroic film attached to the light-transmitting substrate; the dichroic film in the transmission region is used to transmit the incident second laser, and the dichroic film in the reflection region is used to reflect the incident second laser.

6. The light source assembly according to any one of claims 1 to 3, characterized in that, The first laser is a red laser, and the second laser includes blue and green lasers.

7. The light source assembly according to any one of claims 1 to 3, characterized in that, The m combining lenses are parallel.

8. A projection device, characterized in that, The projection device includes: a light source assembly as described in any one of claims 1 to 7, as well as an optical engine and a lens; The light source assembly is used to emit light to the optical engine, the optical engine is used to converge the light emitted by the light source assembly to the lens, and the lens is used to project the light converged by the optical engine.

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