Laser and projection light source

Abstract

This application discloses a laser and a projection light source, belonging to the field of optoelectronic technology. The laser includes a base plate, multiple tube walls, multiple sets of light-emitting chips, and multiple collimating lens groups; different sets of light-emitting chips emit lasers of different colors; the multiple tube walls and the multiple sets of light-emitting chips are all located on the base plate; the tube walls are annular, each tube wall corresponding to one set of light-emitting chips, with each tube wall surrounding a corresponding set of light-emitting chips; each set of light-emitting chips is arranged in a row along a first direction; the multiple collimating lens groups correspond one-to-one with the multiple tube walls, with each collimating lens group located on the side of the corresponding tube wall away from the base plate; each collimating lens group includes multiple collimating lenses, each collimating lens corresponding to each light-emitting chip surrounded by the tube wall of the collimating lens group, and each collimating lens is located on the transmission path of the laser emitted by the corresponding light-emitting chip. This application solves the problem of low laser output collimation. This application is used for light emission.

Description

[0001] This application claims priority to Chinese Patent Application No. 202210246346.4, filed on March 14, 2022, entitled "Laser and Projection Light Source", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of optoelectronic technology, and in particular to a laser and a projection light source. Background Technology

[0003] With the development of optoelectronic technology, lasers are widely used, and the requirements for laser light output are becoming increasingly stringent.

[0004] Figure 1 This is a structural diagram of a laser provided by related technologies. For example... Figure 1 As shown, the laser 00 includes: a base plate 001, an annular sidewall 002, multiple conductive pins 003, multiple light-emitting chips 004, and a collimating lens assembly 005. The sidewall 002 and the light-emitting chips 004 are both fixed to the base plate 001, and the sidewall 002 surrounds the multiple light-emitting chips 004. The multiple light-emitting chips 004 may include at least two types of light-emitting chips, with different types emitting lasers of different colors. The multiple conductive pins 003 penetrate the sidewall 002 to transmit current to the light-emitting chips 004. The collimating lens assembly 005 includes multiple integrally formed collimating lenses T, each corresponding one-to-one with one of the multiple light-emitting chips 004. The laser emitted by each light-emitting chip 004 is transmitted to the corresponding collimating lens T, and then collimated by the collimating lens T before being emitted.

[0005] When assembling the collimating lens group 005, each collimating lens T needs to be aligned with its corresponding light-emitting chip 004. In related technologies, the possibility of errors during the alignment of the collimating lens group 005 is relatively large, which leads to a low collimation of the laser 00. Summary of the Invention

[0006] This application provides a laser and a projection light source that can solve the problem of low collimation of laser output. The technical solution includes:

[0007] One aspect provides a laser, which includes: a base plate, multiple tube walls, multiple sets of light-emitting chips, and multiple collimating lens groups; different sets of light-emitting chips emit lasers of different colors;

[0008] Multiple tube walls and multiple sets of light-emitting chips are located on the base plate; the tube walls are in the shape of rings, and multiple tube walls correspond one-to-one with multiple sets of light-emitting chips, with each tube wall surrounding a corresponding set of light-emitting chips; each set of light-emitting chips is arranged in a row along the first direction.

[0009] Multiple collimating lens groups correspond one-to-one with multiple tube walls, with each collimating lens group located on the side of the corresponding tube wall away from the base plate; each collimating lens group includes multiple collimating lenses, with each collimating lens corresponding one-to-one with each light-emitting chip surrounded by the tube wall of the collimating lens group, and each collimating lens located on the transmission path of the laser emitted by the corresponding light-emitting chip.

[0010] On the other hand, a projection light source is provided, which includes: the laser mentioned above, as well as a beam combining lens group, a converging lens and a beam homogenizing component;

[0011] The beam combining mirror assembly is located on the light-emitting side of the laser, and the beam combining mirror assembly, converging lens, and beam homogenizing component are arranged sequentially along the target direction;

[0012] The beam combining lens group is used to mix the laser emitted by the laser and direct it towards the converging lens along the target direction. The converging lens is used to converge the incoming laser to the homogenizing component, and the homogenizing component is used to homogenize the incoming laser before it is emitted.

[0013] On another front, a projection light source is provided, which includes at least two lasers, a beam combining mirror group, a diffusion component, and a beam homogenizing component; the beam combining mirror group is used to combine the laser beams emitted by at least two lasers and direct them toward the diffusion component; the diffusion component is used to angularly diffuse the combined beam and direct it to the beam homogenizing component for homogenization before output; wherein, the combined beam of each laser is a three-color laser.

[0014] The beneficial effects of the technical solution provided in this application include at least the following:

[0015] In this application, the laser includes multiple sets of light-emitting chips, multiple tube walls, and multiple collimating lens groups. Each collimating lens group is located on the side of the corresponding tube wall away from the base plate to collimate the laser emitted by each light-emitting chip surrounded by that tube wall. During laser fabrication, only the collimating lens group corresponding to each set of light-emitting chips needs to be aligned. Since the light-emitting chips in the laser are placed in multiple tube walls, the number of light-emitting chips in each tube wall is relatively small. Furthermore, the alignment effect between each collimating lens in the collimating lens group and its corresponding light-emitting chip is good, ensuring that the collimating lens group effectively aligns and collimates the laser emitted by each light-emitting chip in the corresponding tube wall, thus improving the collimation accuracy of the laser emitted by the laser. Additionally, the laser of this application is easily miniaturized and packaged. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a schematic diagram of the structure of a laser provided by related technologies;

[0018] Figure 2 This is a schematic diagram of the structure of a laser provided in an embodiment of this application;

[0019] Figure 3 This is a schematic diagram of another laser structure provided in an embodiment of this application;

[0020] Figure 4 This is a schematic diagram of another laser structure provided in the embodiments of this application;

[0021] Figure 5 This is a schematic diagram of another laser structure provided in the embodiments of this application;

[0022] Figure 6 This is a schematic diagram of the structure of a projection light source provided in an embodiment of this application;

[0023] Figure 7 This is a schematic diagram of the light combining structure of another projection light source provided in an embodiment of this application;

[0024] Figure 8 This is a schematic diagram of another projection light source provided in the embodiments of this application. Detailed Implementation

[0025] 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.

[0026] With the development of optoelectronic technology, lasers are being used more and more widely, for example, as a light source for laser projection devices or laser TVs. Currently, the requirements for laser luminous efficacy, miniaturization, and reliability are also increasing. This application provides a laser that can improve the collimation of the emitted laser light, ensure the laser's luminous efficacy, and to a certain extent facilitate miniaturization, as well as improve the laser's reliability and operational flexibility.

[0027] Figure 2 This is a schematic diagram of the structure of a laser provided in an embodiment of this application. Figure 3 This is a schematic diagram of another laser structure provided in an embodiment of this application. Figure 3 It can be Figure 2 The diagram shows a schematic of the cross-section a-a' of the laser. Please refer to... Figure 2 and Figure 3The laser 10 may include a base plate 101, multiple annular tube walls 102, multiple sets of light-emitting chips 103, and multiple collimating lens groups 104. In this embodiment, the laser 10 is illustrated by having two tube walls 102, two sets of light-emitting chips 103, and two collimating lens groups 104. Optionally, the number of tube walls 102, the number of sets of light-emitting chips 103, and the number of collimating lens groups 104 in the laser 10 may also be 3, 4, or other values; this embodiment does not limit the specific values.

[0028] The plurality of tube walls 102 and the plurality of groups of light-emitting chips 103 are all located on the base plate 101. Each tube wall 102 corresponds one-to-one with each group of light-emitting chips 103, with each tube wall 102 surrounding a corresponding group of light-emitting chips 103. Different groups of light-emitting chips 103 emit lasers of different colors. Each group of light-emitting chips 103 may include multiple light-emitting chips 103, and the multiple light-emitting chips 103 in each group can be arranged in a row along a first direction. This first direction is... Figure 2 and Figure 3 y direction in .

[0029] The plurality of collimating lens groups 104 correspond one-to-one with the plurality of tube walls 102, with each collimating lens group 104 located on the side of the corresponding plurality of tube walls 102 away from the base plate 101. Each collimating lens group 104 may include a plurality of collimating lenses T, which correspond one-to-one with the plurality of light-emitting chips 103 surrounded by the tube wall 102, and each collimating lens T is located on the transmission path of the laser emitted by the corresponding light-emitting chip 103. Optionally, on the base plate 101, the orthographic projection of each collimating lens T may cover the orthographic projection of the corresponding light-emitting chip 103.

[0030] It should be noted that the laser emitted by the light-emitting chip 103 is conical and has a certain divergence angle. If the laser continues to propagate at this divergence angle, the laser spot will become larger and larger, and its energy will become more and more diffuse, making it difficult to utilize the laser in subsequent applications. In this embodiment, the laser emitted by the light-emitting chip 103 can be collimated by the collimating lens group 104 before being emitted. Collimating the light is to adjust the divergence angle of the light, so that the adjusted light is close to parallel light. The laser emitted by each light-emitting chip 103 can be propagated in a direction away from the base plate 101 (such as the z-direction), and then directed towards the corresponding collimating lens T. After being collimated by the collimating lens T, it is emitted to realize the output of the laser 10.

[0031] In this embodiment, each collimating lens T in each collimating lens group 104 can be integrally formed. For example, the collimating lens group 104 is generally plate-shaped, with the side of the collimating lens group 104 near the base plate 101 being flat, and the side away from the base plate 101 having multiple convex arc surfaces. Each of these convex arc surfaces constitutes a collimating lens T. Each collimating lens T in the collimating lens group 104 can be formed according to the dimensions and spacing specified in the design rules.

[0032] Each light-emitting chip 103 in the laser 10 can be mounted at a position that matches the design rules of the collimating lens T. There is a significant possibility of mounting errors during the mounting process of the light-emitting chips 103, meaning that the actual mounting position may deviate slightly from the designed mounting position. When assembling the collimating lens group 104, each collimating lens T in each collimating lens group 104 must be aligned with its corresponding light-emitting chip 103 to ensure that the laser emitted by each light-emitting chip 103 is as much as possible directed into its corresponding collimating lens T.

[0033] In this embodiment, multiple sets of light-emitting chips 103 are respectively arranged in the area surrounded by the multiple tube walls 102 of the laser 10, and each set of light-emitting chips 103 is collimated using a corresponding collimating lens group 104. Thus, even if there is an error in the mounting position of one set of light-emitting chips 103, it will not affect the collimation effect of other sets of light-emitting chips 103. Furthermore, each collimating lens group 104 can correspond to a smaller number of light-emitting chips 103, making it easier to ensure the alignment of each collimating lens T in the collimating lens group 104 with the corresponding light-emitting chip 103. Consequently, the laser emitted by each light-emitting chip 103 can be directed more towards the corresponding collimating lens T, improving the collimation accuracy of the laser emitted by the laser 10.

[0034] In summary, the laser provided in this application embodiment may include multiple sets of light-emitting chips, multiple tube walls, and multiple collimating lens groups. Each collimating lens group is located on the side of the corresponding tube wall away from the base plate to collimate the laser emitted by each light-emitting chip surrounded by that tube wall. During laser fabrication, only the collimating lens group corresponding to each set of light-emitting chips needs to be aligned. Since the light-emitting chips in the laser are placed in multiple tube walls, the number of light-emitting chips in each tube wall is relatively small. Furthermore, the alignment effect between each collimating lens in the collimating lens group and its corresponding light-emitting chip is good, ensuring that the collimating lens group effectively collimates the laser emitted by each light-emitting chip, thereby improving the collimation accuracy of the laser emitted by the laser.

[0035] Optionally, the tube wall 102 and the base plate 101 can be fixed by brazing. However, the brazing process generates high heat, which can cause thermal stress in the tube wall 102 and the base plate 101. If the thermal stress is large, the tube wall 102 and the base plate 101 may be damaged. In this embodiment, multiple tube walls 102 in the laser 10 can be fixed to the base plate 101 in a time-sharing manner. For example, one tube wall 102 can be welded to the base plate 101, and after both the tube wall 102 and the base plate 101 have cooled down, another tube wall 102 can be welded to the base plate 101.

[0036] Thus, due to the small volume of each pipe wall 102, the contact area between each pipe wall 102 and the base plate 101 is small. Since the thermal stress during welding of two objects is positively correlated with the contact area between them, the thermal stress generated during each welding of the individual pipe walls 102 on the base plate 101 is relatively small. Furthermore, when welding the next pipe wall 102 after the previous one has been welded, the stress generated between the previous pipe wall 102 and the base plate 101 can be largely released, thereby reducing the risk of damage to the pipe walls 102 and the base plate 101 due to thermal stress during welding.

[0037] Furthermore, in this embodiment, the laser 10 is provided with multiple independent tube walls 102, and a light-emitting chip 103 is set in each tube wall 102. This is equivalent to modularizing the laser 10, with each tube wall 102 acting as a small laser. This allows for flexible structural changes to the laser 10, enabling adjustments to its structure in different application scenarios and improving its usability.

[0038] Please continue to refer to this. Figure 3 The laser 10 may further include multiple heat sinks 105 and multiple reflecting prisms 106. Each heat sink 105 and each reflecting prism 106 may correspond one-to-one with a light-emitting chip 103 in the laser 10. Each light-emitting chip 103 is located on a corresponding heat sink 105, which assists in heat dissipation for the corresponding light-emitting chip 103. The material of the heat sink 105 may include ceramic. Each reflecting prism 106 is located on the light-emitting side of the corresponding light-emitting chip 103. The light-emitting chip 103 can emit laser light towards the corresponding reflecting prism 106, and the reflecting prism 106 can reflect the laser light in a direction away from the base plate 101 (e.g., the z-direction) towards the corresponding collimating lens T.

[0039] Optionally, the laser 10 may further include multiple light-transmitting sealing layers 108. Each light-transmitting sealing layer 108 is located on the side of a tube wall 102 away from the base plate 101, and is used to seal the opening on the side of the tube wall 102 away from the base plate 101, so as to form a sealed space together with the tube wall 102 and the base plate 101. Optionally, the edge region of the light-transmitting sealing layer 108 can be directly fixed to the surface of the tube wall 102 away from the base plate 101. Alternatively, the laser may also include a sealing frame, through which the light-transmitting sealing layer can be fixed to the tube wall. This application does not illustrate this method. For example, the edge of the light-transmitting sealing layer is fixed to the inner edge of the sealing frame, and the outer edge of the sealing frame is fixed to the surface of the tube wall away from the base plate, thereby achieving the fixation of the light-transmitting sealing layer to the tube wall.

[0040] Alternatively, the laser 10 may not include the light-transmitting sealing layer 108, but may be directly fixed to the surface of the tube wall 102 away from the base plate 101 by the collimating lens assembly 104. In this way, the collimating lens assembly 104, the tube wall 102, and the base plate 101 together form a sealed space.

[0041] Optionally, each tube wall 102 in the laser 10 can be in the shape of a square ring. The orthographic projection of each tube wall 102 on the base plate 101 can be rectangular or approximately rectangular. For example, the orthographic projection can be a rounded rectangle or a chamfered rectangle. A rounded rectangle is a shape obtained by changing the corners of a rectangle to rounded corners, and a chamfered rectangle is a shape obtained by changing the corners of a rectangle to chamfered corners.

[0042] For example, such as Figure 2 As shown, the orthographic projection of the pipe wall 102 onto the base plate 101 is rectangular. The length direction of this rectangle is the first direction, i.e., the y-direction; the width direction is the second direction, i.e., the x-direction. The first direction is perpendicular to the second direction. The first direction can also be the length direction of the pipe wall 102, and the second direction can also be the width direction of the pipe wall 102. The z-direction can be the height direction of the pipe wall 102. The z-direction is perpendicular to the x-direction and perpendicular to the y-direction. Optionally, the width direction of the pipe wall 102 can also be the first direction and the length direction can be the second direction; this embodiment does not limit this.

[0043] Optionally, the multiple tube walls 102 in the laser 10 can be arranged sequentially along a second direction. Since the second direction is the width direction of the tube walls 102, arranging the tube walls 102 sequentially along the second direction ensures that the overall shape of the laser 10 is relatively square, facilitating storage, transportation, and use. Optionally, the multiple tube walls 102 can also be arranged sequentially along a first direction; this embodiment does not limit the arrangement. For example, when the width direction of the tube walls 102 is the first direction and the length direction is the second direction, the multiple tube walls 102 can be arranged sequentially along the first direction.

[0044] Optionally, the slow axis of the laser emitted by the light-emitting chip 103 surrounded by each tube wall 102 can be parallel to the first direction, which is the arrangement direction of the light-emitting chips 103 in the tube wall 102. It should be noted that the propagation speed of the laser varies in different light vector directions. The direction of the light vector with a faster propagation speed is the fast axis, i.e., the direction with faster angular divergence. The direction of the light vector with a slower propagation speed is the slow axis, i.e., the direction with slower angular divergence. The fast axis is perpendicular to the slow axis. In this example, the fast axis is parallel to the second direction, i.e., the width direction of the multiple tube walls. The screen formed by the first and second directions is parallel to the light-emitting surface of the light-emitting chip 103. The divergence angle of the laser on the fast axis is greater than that on the slow axis; for example, the divergence angle on the fast axis is generally more than three times that on the slow axis.

[0045] In this embodiment, the light-emitting chips 103 are arranged with the slow axis of the emitted laser as the arrangement direction. Since the laser divergence angle is small in this direction, the distance between the light-emitting chips 103 can be small, and the density of the light-emitting chips 103 within the area surrounded by the tube wall 102 can be large, while avoiding interference and overlap between lasers emitted from adjacent light-emitting chips 103. Furthermore, when the same number of light-emitting chips 103 are used as in lasers of related technologies, the volume of the tube wall 102 in this application can be smaller, and the volume of the laser 10 can also be correspondingly smaller, which is beneficial for laser miniaturization.

[0046] In this embodiment, the laser colors emitted by different groups of light-emitting chips 103 are all different. Each group of light-emitting chips 103 may include multiple light-emitting chips 103. In specific implementations, when the laser includes multiple groups of light-emitting chips, one group of light-emitting chips can emit laser of the same color, and another group of light-emitting chips can emit laser of a different color. Furthermore, in some embodiments, the multiple light-emitting chips 103 emitting laser of the same color in each group of light-emitting chips 103 are arranged adjacent to each other. In some embodiments, the light-emitting chips 103 in each group of light-emitting chips 103 are arranged adjacent to the light-emitting chips 103 emitting laser of a different color.

[0047] The following is a detailed introduction to each group of light-emitting chips 103 in the laser 10.

[0048] In one alternative approach, each light-emitting chip 103 in each group of light-emitting chips 103 is used to emit laser light of the same color. For example, Figure 4This is a schematic diagram of another laser structure provided in an embodiment of this application. The laser 10 may include three sets of light-emitting chips, which are respectively located in three tube walls 102 arranged in sequence. The first set of light-emitting chips consists of red light-emitting chips 103a, used to emit red laser light; the second set consists of green light-emitting chips 103b, used to emit green laser light; and the third set consists of blue light-emitting chips 103c, used to emit blue laser light. The number of red light-emitting chips 103a can be greater than the number of green light-emitting chips 103b, and can also be greater than the number of blue light-emitting chips 103c. For example, the number of red light-emitting chips 103a is 5, the number of green light-emitting chips 103b is 4, and the number of blue light-emitting chips 103c is 3.

[0049] Optionally, the number of groups of light-emitting chips in the laser 10 can be 2, 4, or other values. The light-emitting chips can also be yellow, purple, or other colored chips, and the number of each light-emitting chip can be adjusted. This application embodiment does not limit this. For example, the number of each color light-emitting chip can be set according to the required ratio of each color laser component provided by the laser. If a larger blue component is required, more blue light-emitting chips can be set; if a larger green component is required, more green light-emitting chips can be set.

[0050] In another alternative embodiment, at least one set of light-emitting chips 103 in the laser 10 comprises at least two types of light-emitting chips. Each type of light-emitting chip is used to emit laser light of a different color, and different types of light-emitting chips emit laser light of different colors.

[0051] For example, Figure 5 This is a schematic diagram of another laser provided in the embodiments of this application. Figure 5 It can be Figure 2 Top view, Figure 3 It can also be Figure 5 The diagram shows the interface a-a' of the laser. Figure 5 As shown, the laser 10 may include two sets of light-emitting chips. One set of light-emitting chips includes a first type of light-emitting chip, and the other set includes a second type and a third type of light-emitting chip. The wavelengths of the lasers emitted by the first, second, and third types of light-emitting chips decrease sequentially, and these three types of light-emitting chips are used to emit lasers of different colors. For example, the first, second, and third types of light-emitting chips are respectively: red light-emitting chip 103a, green light-emitting chip 103b, and blue light-emitting chip 103c, which are used to emit red, green, and blue lasers, respectively. The red light-emitting chip 103a is surrounded by a single tube wall 102, while the green and blue light-emitting chips 103b and 103c are surrounded by the same tube wall 102.

[0052] Optionally, the number of the first type of light-emitting chips can be greater than the number of the second type of light-emitting chips, and also greater than the number of the third type of light-emitting chips. Optionally, the number of the first type of light-emitting chips can be equal to or less than the sum of the number of the second type of light-emitting chips and the number of the third type of light-emitting chips.

[0053] In some embodiments, the number of first-type light-emitting chips is less than the sum of the number of second-type and third-type light-emitting chips, and the number of second-type light-emitting chips is greater than the number of third-type light-emitting chips.

[0054] In some embodiments, the wavelengths of the lasers emitted by the individual light-emitting chips in the first type of light-emitting chip differ by 4 nm to 10 nm. The first type of light-emitting chip emits red laser light.

[0055] like Figure 5 The number of red light-emitting chips 103a is 5, the number of green light-emitting chips 103b is 3, and the number of blue light-emitting chips 103c is 2. At this time, the number of red light-emitting chips 103a is equal to the sum of the number of green light-emitting chips 103b and blue light-emitting chips 103c. Correspondingly, as... Figure 2 As shown, both collimating lens groups 104 include 5 collimating lenses T. Alternatively, the number of red light-emitting chips 103a can be set to 5, the number of green light-emitting chips 103b to 3, and the number of blue light-emitting chips 103c to 3. Alternatively, the number of red light-emitting chips 103a can be 4, the number of green light-emitting chips 103b to 3, and the number of blue light-emitting chips 103c to 2. Furthermore, the number of collimating lenses T in the collimating lens group 104 can be adjusted accordingly. In this case, the number of red light-emitting chips 103a is less than the sum of the number of green light-emitting chips 103b and blue light-emitting chips 103c.

[0056] It should be noted that the number of various types of light-emitting chips can be adjusted according to specific needs, and the number of light-emitting chips is not limited in this embodiment. Optionally, the laser 10 may contain a group of light-emitting chips including three or more types of light-emitting chips, or it may contain multiple groups of light-emitting chips including at least two types of light-emitting chips, and this embodiment does not limit the number of light-emitting chips.

[0057] Alternatively, please continue to refer to Figures 2 to 5In this embodiment, the laser 10 may further include multiple power supply pins 107. These power supply pins 107 are located outside the area surrounded by the tube walls 102 on the base plate 101. These power supply pins 107 are connected to an external power source and can be electrically connected to the light-emitting chips 103 surrounded by the tube walls 102, thereby transmitting current to the light-emitting chips 103 and triggering them to emit laser light. The multiple power supply pins 107 can be located on the same side of the tube walls 102 in the laser 10. This facilitates a unified current supply to the light-emitting chips 103 surrounded by the tube walls 102, and simplifies the arrangement of the tube walls 102 and their corresponding light-emitting chips 103.

[0058] The plurality of power supply pins 107 may include a plurality of positive pins and at least one negative pin. The positive pins are used to connect to the positive terminal of an external power supply, and the negative pins are used to connect to the negative terminal of an external power supply. Each light-emitting chip 103 is electrically connected to one positive pin and one negative pin.

[0059] Optionally, at least two sets of light-emitting chips 103 in the laser 10 are connected to the same negative terminal pin and different positive terminal pins, meaning that the at least two sets of light-emitting chips 103 share a negative terminal pin. Each positive terminal pin is connected only to a light-emitting chip that emits laser light of the same color; that is, light-emitting chips of the same type are connected to the same positive terminal pin, and light-emitting chips of different types are connected to different positive terminal pins. Since different types of light-emitting chips require different currents to emit laser light of the corresponding color, different currents need to be applied to different types of light-emitting chips, and at least one of the positive and negative terminal pins connected to different types of light-emitting chips needs to be different. When all light-emitting chips share a negative terminal pin, they can no longer share a positive terminal pin.

[0060] For example, such as Figure 4 and 5 As shown, the laser 10 includes four power supply pins 107, three of which are positive pins and the remaining pin is a negative pin. The negative pin is electrically connected to each of the light-emitting chips in the laser. The three positive pins are used to electrically connect to the red light-emitting chip 103a, the green light-emitting chip 103b, and the blue light-emitting chip 103c, respectively, to transmit current to the corresponding light-emitting chips.

[0061] Optionally, at least two types of light-emitting chips in the laser 10 can be connected to the same positive terminal pin and different negative terminal pins, that is, the at least two types of light-emitting chips share a positive terminal pin. Alternatively, any two types of light-emitting chips can be connected to different positive terminal pins and different negative terminal pins, that is, each type of light-emitting chip does not share a power supply pin.

[0062] Optionally, light-emitting chips of the same type within the same group can be connected in series. For example, wire bonding tools can be used to connect the individual light-emitting chips in this group in series. Optionally, the wire can be gold wire, and the process of fixing the wire to other components can also be called gold wire bonding.

[0063] Please continue to refer to this. Figure 4 and Figure 5 In this embodiment, the laser 10 may further include multiple power supply terminals 109. Each tube wall 102 may have at least two openings (not shown in the figure), through which the power supply terminal 109 can pass into the tube wall 102, such that part of the power supply terminal 109 is surrounded by the tube wall 102, and part is located outside the surrounded area of ​​the tube wall 102. The power supply terminal 109 can serve to connect components within the surrounded area of ​​the tube wall 102 to components outside the tube wall 102. A wire can be provided between the light-emitting chip and the portion of the power supply terminal surrounded by the tube wall 102 to connect the light-emitting chip to the outside of the tube wall 102.

[0064] Each type of light-emitting chip in each group can correspond to two power supply terminals 109. One power supply terminal 109 is used to connect to the positive pin, and the other power supply terminal 109 is used to connect to the negative pin. The two ends of this type of light-emitting chip are respectively connected to the two power supply terminals 109. If multiple types of light-emitting chips in a group share a negative pin or a positive pin, then these multiple types of light-emitting chips can also share a power supply terminal 109, which is connected to a shared power supply pin 107. Optionally, a transmission circuit can be embedded in the base plate 101 of the laser 10, which can be used to connect the power supply terminals 109 and the corresponding power supply pins 107.

[0065] For example, Figure 4 Each group of light-emitting chips includes only one type of light-emitting chip, and all of these chips are connected in series. Therefore, each tube wall 102 can have two power supply terminals 109 fixed on it. One of the two power supply terminals 109 fixed on each tube wall 102 is connected to the positive pin corresponding to the group of light-emitting chips, and the other is connected to the negative pin shared by all groups of light-emitting chips. Figure 5 The left-side tube wall 102 contains only one type of light-emitting chip, namely a red light-emitting chip 103a, and two power supply terminals 109 are fixed on this tube wall 102. The right-side shut-off 102 contains two types of light-emitting chips, namely a green light-emitting chip 103b and a blue light-emitting chip 103c. These two types of light-emitting chips share one power supply terminal, therefore, three power supply terminals 109 can be fixed on this tube wall 102.

[0066] Optionally, different types of light-emitting chips sharing the same power supply pin 107 within the same group of light-emitting chips 103 can also correspond to two different power supply terminals 109, such as... Figure 5 The green light-emitting chip 103b and the blue light-emitting chip 103c in the middle can also be connected to two different power supply terminals 109 at their close ends. This embodiment of the application does not illustrate this method.

[0067] In summary, the laser provided in this application embodiment may include multiple sets of light-emitting chips, multiple tube walls, and multiple collimating lens groups. Each collimating lens group is located on the side of the corresponding tube wall away from the base plate to collimate the laser emitted by each light-emitting chip surrounded by that tube wall. During laser fabrication, only the collimating lens group corresponding to each set of light-emitting chips needs to be aligned. Since the light-emitting chips in the laser are placed in multiple tube walls, the number of light-emitting chips in each tube wall is relatively small. Furthermore, the alignment effect between each collimating lens in the collimating lens group and its corresponding light-emitting chip is good, ensuring that the collimating lens group effectively collimates the laser emitted by each light-emitting chip, thereby improving the collimation accuracy of the laser emitted by the laser.

[0068] Figure 6 This is a schematic diagram of the structure of a projection light source assembly provided in an embodiment of this application. For example... Figure 6 As shown, the projection light source may include a laser 10, a beam combiner 20, a converging lens 30, and a light homogenizing component 40. The beam combiner 20 is located on the light-emitting side of the laser 10, and the beam combiner 20, the converging lens 30, and the light homogenizing component 40 may be arranged sequentially along the target direction, such as the x-direction.

[0069] The laser emitted by laser 10 can be directed towards the beam combiner assembly 20. The beam combiner assembly 20 mixes the various colors of laser light emitted by laser 10 and directs it towards the converging lens 30 along the target direction. The converging lens 30 can converge the laser light and direct it towards the homogenizing component 40. The homogenizing component 40 can homogenize the incoming laser light before it is emitted. The laser light emitted by the homogenizing component 40 can be used for subsequent image projection to form a projected image.

[0070] The beam combining mirror assembly 20 may include multiple beam combining mirrors arranged along the target direction. Each beam combining mirror is located on the side of a collimating mirror assembly 104 in the laser 10 away from the base plate 101, and the beam combining mirror is tilted. On the base plate 101 of the laser 10, the orthogonal projection of each beam combining mirror can cover the corresponding collimating mirror assembly 104. Optionally, the beam combining mirror furthest from the converging lens 30 in the beam combining mirror assembly 20 may be a full-spectrum reflecting mirror; the remaining beam combining mirrors may be dichroic mirrors, used to reflect the laser light emitted from the laser 10 toward the dichroic mirror, and transmit the laser light emitted from the beam combining mirror furthest from the converging lens 30. Optionally, the beam combining mirror furthest from the converging lens 30 may also be a dichroic mirror, which is not limited in this embodiment.

[0071] like Figure 6 As shown, the beam combining mirror assembly 20 includes a first reflecting mirror 201 and a first two-way beam combining mirror 202, used to combine the light-emitting chips inside the two tube walls of the laser. The light-emitting chips inside the two tube walls can jointly emit three-color lasers. The configuration of the two chip assemblies can be found in the aforementioned embodiment.

[0072] The first reflector 201 is configured to reflect at least one color of laser light from a plurality of laser colors. The first reflector 201 is located on the side of the first two-way beam combiner 202 away from the converging lens 30. The first two-way beam combiner 202 is located in the light-emitting path of the first reflector 201 and is positioned close to the converging lens 30. The first two-way beam combiner 202 is configured to transmit at least one color of laser light and reflect the remaining colors of laser light from the plurality of laser colors. Thus, the first beam combiner 201 reflects the laser light emitted from the laser 10 toward itself and then into the first two-way beam combiner 202. The first two-way beam combiner 202 reflects the laser light emitted from the laser 10 toward itself and then into the converging lens 30, and transmits the laser light emitted from the first reflector 201 toward itself into the converging lens 30.

[0073] In some embodiments, the first reflector 201 is configured to correspond to a group of light-emitting chips in one of the tube walls, which can emit two colors of light, such as blue laser and green laser, and the first dichroic beam combiner 202 is configured to correspond to a group of light-emitting chips in another tube wall, which can emit one color of light, such as red laser.

[0074] In some embodiments, the first bidirectional light combiner 202 combines light using the principle of wavelength combining, for example, it can transmit light of blue and green wavelengths and reflect light of red wavelengths.

[0075] Furthermore, by placing the tube wall emitting the red laser beam close to the converging lens, the large divergence of the red laser beam itself, which leads to an increase in the spot size after long-distance transmission, can be reduced, thus decreasing the difficulty of light collection.

[0076] Furthermore, in some embodiments, the first two-way beam combiner 202 can combine light through the principle of polarization. For example, blue laser and green laser have the same polarization direction, but different from the polarization direction of red laser, usually by 90 degrees. Thus, the first two-way beam combiner 202 can reflect light of another polarization direction (red laser in this example) from light of one polarization direction (blue laser and green laser in this example).

[0077] Optionally, in the embodiments of this application, the light-uniforming component 40 can be a light guide or a compound eye lens or other component used for light uniformity.

[0078] Figure 7 This is a schematic diagram of the optical path of a projection light source according to some embodiments. Figure 7 In the diagram, different types of dashed arrows represent lasers of different colors. For example... Figure 7 As shown, in some embodiments, the beam combining mirror group 20 includes a beam combining prism 203, a second reflecting mirror 204, a third reflecting mirror 205, and a second dichroic beam combining mirror 206, used to combine the light-emitting chip groups inside the two tube walls of the laser. The light-emitting chips inside the two tube walls can jointly emit three-color laser light. The configuration of the light-emitting chip groups mentioned in this embodiment can be found in the aforementioned embodiments.

[0079] The beam combining prism 203 is positioned relative to one of the light-emitting chip groups within the tube wall, and includes a first mirror 2031 and a second mirror 2032 arranged opposite each other. The first mirror 2031 is configured to reflect a first-color laser and transmit a second-color laser. A third-color laser is refracted on the first mirror 2031 and thus transmitted into the beam combining prism 203. The second mirror 2032 is configured to reflect a third-color laser, which is then refracted again on the first mirror 2031 and emitted from the beam combining prism 203. The beam combining prism 203 has a certain thickness; by adjusting the thickness of the beam combining prism 203, axially symmetrical beam combining of the first-color and third-color laser beams can be achieved.

[0080] Specifically, such as Figure 7As shown, the third-color laser is refracted at the first mirror 2031 and then enters the interior of the beam combining prism 203. Inside the beam combining prism 203, the refracted third-color laser is reflected at the second mirror 2031, and the reflected third-color laser is refracted again at the first mirror 2031 before exiting from the interior of the beam combining prism 203. Thus, because the beam combining prism 203 has a certain thickness, the spot position of the third-color laser after refraction and propagation a certain distance inside, when it is incident on the second mirror 2032, is offset compared to the intersection point of the normal to the spot position initially incident on the first mirror 2031 and the second mirror 2032. Furthermore, the third-color laser is also reflected by the second mirror 2032 and then incident on the first mirror 2031 again. At this point, the spot position of the third laser on the first mirror 2031 is also offset compared to its spot position on the second mirror 2032 due to reflection. In this way, after the third color laser undergoes secondary transmission and primary reflection through the beam combining prism 203, it can superimpose with the spot position of the first color laser incident on the first mirror 2031, thereby achieving axially symmetrical beam combining of the first color laser and the third color laser, improving the overlap of the beam spots of the combined beam of the two colors of laser, and the size of the combined beam spot of the first color laser and the third color laser will also be smaller.

[0081] The first and third color lasers emitted from the combining prism 203 enter the second reflector 204. The second reflector 204 is located in the reflected light path of the combining prism 203 and is configured to reflect the first and third color lasers.

[0082] A second-color laser emitted from a light-emitting chip array within another tube wall is directed into a third reflector 205. The third reflector 205 is configured to reflect only the second-color laser.

[0083] The second dichroic beam combiner 206 is located at the intersection of the reflected light path of the second reflector 204 and the reflected light path of the third reflector 205. The second dichroic beam combiner 206 is configured to transmit laser light of the first color and laser light of the third color, and to reflect laser light of the second color.

[0084] Thus, the first color laser and the third color laser, after being reflected by the second reflector 204 and transmitted through the second dihedral combining mirror 206, and the second color laser, after being reflected by the third reflector 205 and the second dihedral combining mirror 206, can be combined at the exit of the combining mirror group 20.

[0085] In some embodiments, such as Figure 7As shown, a converging lens is provided at the light exit of the projection light source 1 to compress the angle of the combined light beam. Furthermore, to improve the speckle reduction effect, the projection light source also includes a diffuser wheel 50 and a homogenizing component 40, which can be a light guide or other homogenizing component (e.g., a compound eye lens). The diffuser wheel 50 is disposed between the converging lens 30 and the homogenizing component 40. The diffuser wheel 50 is configured to receive the mixed laser light, and after angularly diffusing and shaping the mixed laser light, it is emitted along the target direction.

[0086] In some embodiments, a light homogenizing or light diffusing component can be further provided between the converging lens and the diffuser wheel, such as a diffuser plate or a compound eye lens group. The combination of the fixed diffuser plate and the moving diffuser wheel achieves a better effect in eliminating speckles.

[0087] In some embodiments, the projection light source may include multiple lasers, each laser may include multiple tube walls, and each tube wall contains a corresponding set of light-emitting chips. For example... Figure 8 As shown, the projection light source includes two lasers 10a and 10b, each of which can include two tube walls. The two tube walls emit laser light of different colors, and each laser outputs tri-color laser light. See also... Figure 6 In the optical path, laser 10a and laser 10b combine light through reflector 201a, beam combiner 202a and reflector 201b, beam combiner 202b respectively. The combined output optical paths of the two lasers do not overlap, but the two combined optical paths are close to each other to reduce the gap between the two combined light spots.

[0088] The combined light spot output by lasers 10a and 10b is incident on the diffuser 60, which can be a vibrating diffuser or a rotating diffuser, and can diffuse the three-color combined light spot to increase the optical spread and thus reduce the speckle effect of the laser.

[0089] The light beam diffused by the diffuser 60 is incident on the homogenizing component 70. The homogenizing component 70 is a compound eye lens, which can homogenize the incident light spot and improve the uniformity of the illumination beam. Figure 8 In the light source architecture shown, the combined beams of the three-color lasers are all incident on the diffuser 60 with their original combined beam size. Since the diffusion effect is positively correlated with the beam size, the diffusion effect is better when the diffuser 60 directly receives the original combined beam size. Furthermore, because the beam size after diffusion by the diffuser 60 is larger, compared to... Figure 6 The light is collected through a light guide. The compound eye lens is more suitable for receiving large light spots for homogenization, while the light guide is suitable for receiving small light spots at large angles.

[0090] In some embodiments, the two lasers 10a and 10b may also undergo beam-shrinking treatment before incident on the diffusion component 60 to reduce the size of the light spot, thereby reducing the light-receiving area of ​​the diffusion component 60 and thus reducing the size of the diffusion component 60.

[0091] Furthermore, a lens can be placed between the diffuser 60 and the compound eye lens 70 to compress the angle of the diffused beam, so that the beam is incident on the compound eye lens 70 as parallel as possible, thereby obtaining a better uniform illumination beam.

[0092] In summary, in the projection light source provided in this application embodiment, because the laser emitted by the laser has good collimation, the projection light source can achieve better beam shaping based on the laser with good collimation. Furthermore, projecting an image based on the laser emitted by the projection light source can obtain a projected image with better display effect, thereby improving the image projection effect of the projection device where the projection light source is located.

[0093] Furthermore, each tube wall contains a corresponding set of light-emitting chips, and different sets of chips emit laser colors differently. When multiple tube walls are used, three-color lasers can be emitted, with each tube wall encapsulating at least one light-emitting chip that emits a single color. This packaging structure facilitates modular structural expansion or splicing, and also leverages the miniaturization of three-color lasers.

[0094] Furthermore, by applying the aforementioned laser with multiple tube-wall encapsulation units, it is easy to achieve beam combining of three colors of laser light. Moreover, due to the superior collimation effect of the laser beam, the use of optical lenses in the optical path can be reduced, simplifying the optical path. The primary purpose of the optical path can then be focused on the diffusion and shaping of the laser beam, emphasizing the elimination of speckle. The diffusion component can be a rotating diffusion wheel or a vibrating diffusion plate.

[0095] And, when combining the aforementioned lasers, such as Figure 6 The light-combining optical path shown can reduce the divergence of the red light beam during propagation by placing the tube wall of the red light-emitting chip close to the light-combining outlet, which is beneficial to the light-gathering efficiency of the optical lens and reduces light loss.

[0096] like Figure 7 The combined light path shown can improve the overlap of the blue and green laser spots by first combining the blue and green lasers through a prism, thereby compressing the combined light spot size.

[0097] In some embodiments, to improve the overlap between the combined blue-green laser beam and the combined red laser beam, diffusers can be placed at the emission surfaces of the blue and green lasers, for example, in... Figure 6 and Figure 7This method is applicable to all the optical path structures shown. The diffuser increases the divergence angle of the blue and green lasers, so that when the blue and green lasers are combined with the red laser with a larger divergence angle, the divergence angles are similar, which is beneficial to the uniformity of the combined light color.

[0098] Furthermore, in some embodiments, to improve the speckle elimination effect, a fixed diffuser can be provided in the combining optical path of the three-color lasers, in addition to the moving diffuser component. For example, a fixed diffuser can be provided in the combining optical path of the three-color lasers. Figure 6 In the optical path shown, a fixed diffuser is set in the three-color laser beam combining path, so that the combined beam first passes through the fixed, stationary diffuser and then through the moving diffuser component. Furthermore, it is possible to... Figure 7 or Figure 8 In the optical path shown, a fixed diffuser is placed in front of the diffuser wheel or the vibrating diffuser.

[0099] The projection light source provided in the above embodiments of this application, by using the laser in the aforementioned embodiments, can perform efficient light combining to achieve the output of three-color lasers, and at the same time, the speckle of the three-color lasers can be eliminated through the setting of the optical path.

[0100] It should be noted that in the embodiments of this application, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "at least one" refers to one or more. The term "multiple" refers to two or more, unless otherwise expressly defined. In this application, the term "at least one of A and B" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, "at least one of A and B" can represent: A existing alone, A and B existing simultaneously, and B existing alone. In this application, the term "and / or" is merely a description of 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. "Approximately," "about," "basically," and "close to" mean that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and substantially achieve the technical effect.

[0101] In the accompanying drawings, the dimensions of layers and regions may be exaggerated for clarity. It is also understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element, or there may be intermediate layers. Similar reference numerals throughout indicate similar elements.

[0102] 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 laser, characterized in that, The laser includes: a base plate, multiple tube walls, multiple sets of light-emitting chips, and multiple collimating lens groups; different sets of light-emitting chips emit lasers of different colors; The plurality of tube walls and the plurality of light-emitting chips are all located on the base plate; the tube walls are annular, and the plurality of tube walls correspond one-to-one with the plurality of light-emitting chips, with each tube wall surrounding a corresponding group of light-emitting chips; each group of light-emitting chips is arranged in a row along a first direction; The plurality of collimating lens groups correspond one-to-one with the plurality of tube walls, and each collimating lens group is located on the side of the corresponding tube wall away from the base plate; each collimating lens group includes a plurality of collimating lenses, and the plurality of collimating lenses correspond one-to-one with each light-emitting chip surrounded by the tube wall of the collimating lens group, and each collimating lens is located on the transmission path of the laser emitted by the corresponding light-emitting chip.

2. The laser according to claim 1, characterized in that, The slow axis of the laser emitted by each of the light-emitting chips is parallel to the first direction.

3. The laser according to claim 1, characterized in that, The plurality of pipe walls are arranged sequentially along a second direction, which is perpendicular to the first direction.

4. The laser according to claim 3, characterized in that, The length of the pipe wall in the first direction is greater than its length in the second direction.

5. The laser according to any one of claims 1 to 4, characterized in that, The multiple sets of light-emitting chips include two sets of light-emitting chips. One set of light-emitting chips includes a first type of light-emitting chip, and the other set of light-emitting chips includes a second type of light-emitting chip and a third type of light-emitting chip. The wavelengths of the lasers emitted by the first type of light-emitting chip, the second type of light-emitting chip, and the third type of light-emitting chip decrease sequentially. The number of the first type of light-emitting chips is greater than the number of the second type of light-emitting chips, and also greater than the number of the third type of light-emitting chips.

6. The laser according to claim 5, characterized in that, The number of the first type of light-emitting chips is equal to or less than the sum of the number of the second type of light-emitting chips and the third type of light-emitting chips; and / or, The number of the second type of light-emitting chips is greater than the number of the third type of light-emitting chips.

7. The laser according to any one of claims 1 to 4, characterized in that, The multiple sets of light-emitting chips include two sets of light-emitting chips. One set of light-emitting chips is a first type of light-emitting chip that emits laser light of the same color, and the wavelengths of the laser light emitted by each light-emitting chip in the first type of light-emitting chip differ by 4nm to 10nm. Another set of light-emitting chips includes a second type of light-emitting chip and a third type of light-emitting chip, which emit lasers of different colors.

8. A projection light source, characterized in that, The projection light source includes: a laser as described in any one of claims 1 to 7, as well as a beam combining mirror group, a converging lens, and a beam homogenizing component; The beam combining mirror group is located on the light-emitting side of the laser, and the beam combining mirror group, the converging lens and the light homogenizing component are arranged sequentially along the target direction; The beam combining lens group is used to mix the laser emitted by the laser and then direct it toward the converging lens along the target direction. The converging lens is used to converge the incoming laser to the beam homogenizing component. The beam homogenizing component is used to homogenize the incoming laser before it is emitted.

9. The projection light source according to claim 8, characterized in that, The beam combining mirror assembly includes: The first reflecting mirror is configured to reflect at least one color of laser light from a plurality of colors; and The first two-way beam combiner is located on the side of the first reflector near the converging lens. The first two-way beam combiner is configured to transmit at least one color of laser light and reflect the remaining colors of laser light among the multiple colors of laser light.

10. The projection light source according to claim 8, characterized in that, The beam combining mirror assembly includes: Optical combining prisms, including: A first mirror is configured to reflect a first-color laser and transmit a second-color laser, while a third-color laser is refracted on the first mirror; and The second mirror is configured to reflect the third color laser, and the reflected third color laser is refracted again on the first mirror. The second reflector, located in the reflected light path of the combining prism, is configured to reflect the first color laser and the third color laser. The third reflector is configured to reflect the laser of the second color; and The second dichroic beam combiner is located at the intersection of the reflected light path of the second reflector and the reflected light path of the third reflector. It is configured to transmit the first color laser and the third color laser, and reflect the second color laser.

11. A projection light source, characterized in that, The projection light source includes at least two lasers as described in any one of claims 1 to 7, as well as a beam combining mirror group, a diffusion component, and a beam homogenizing component; The beam combining mirror group is used to combine the laser beams emitted by the at least two lasers and direct them toward the diffusion component; The diffusion component is used to diffuse the combined light beam at an angle and then output the light after it is homogenized by the light homogenizing component. The combined light from each laser is a tri-color laser.

12. The projection light source according to claim 11, characterized in that, The beam combining mirror group includes multiple reflecting mirrors and multiple two-way beam combining mirrors, which are used to combine the laser beams emitted by each laser, and the combined beams of each laser do not overlap.

13. The projection light source according to claim 11, characterized in that, The diffusion component includes a vibrating diffusion plate or a rotating diffusion plate.

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