Laser light source device and projection apparatus

Abstract

The utility model discloses a kind of laser light source device and projection equipment, the laser light source device includes first laser, second laser, third laser and optical mirror subassembly, optical mirror subassembly includes first reflector and second reflector;Emission light path of first laser and second laser is respectively opposite first reflector and second reflector to reflect light ray emitted by first laser and second laser to main shaft direction;Emission light path of first laser and emission light path of second laser are misaligned and parallel to first direction, first reflector and second reflector form interval space in first direction;The light-emitting direction of third laser is parallel to main shaft direction, and emission light path of third laser passes through interval space, first reflector and second reflector are respectively corresponding to the side of emission light path of third laser away from first laser and second laser.This utility model can significantly reduce the volume of optical machine light source part.

Description

Technical Field

[0001] This utility model relates to the field of projection equipment technology, and in particular to a laser light source device and projection equipment. Background Technology

[0002] With the development of projection technology, projectors are widely used in home, education, and office settings. The light source of projectors can be broadly divided into laser light sources and LED light sources, with laser light sources being more widely used due to their advantages in brightness, lifespan, and color gamut.

[0003] The optical engine of a laser projector typically includes multiple laser light sources. The laser beams emitted from these sources need to be combined and converged before being incident on a spatial light modulator (such as a DMD or LCD) to form a beam carrying image information. During this beam combining process, polarizing mirrors or dichroic mirrors are generally used. This allows some of the laser beams from the light sources to be transmitted through the mirrors, while others are reflected, thus combining the transmitted and reflected beams. However, this beam combining process inevitably requires some of the beams to pass through the polarizing mirrors or dichroic mirrors, which can easily cause energy loss and reduce the brightness of the projected image.

[0004] To address this issue, some solutions involve using a total internal reflection mirror in conjunction with a converging mirror assembly to achieve beam combining of light from different light sources without relying on polarizing mirrors or dichroic mirrors. Mirrors have thickness, including their own thickness and the thickness of the clamping support. In this approach, the mirrors are positioned close to their respective light sources, with their backs facing the light path of the intermediate light source. To prevent the intermediate light source's beam from being blocked, the two mirrors need to be relatively far apart along the X-axis due to their thickness to create sufficient space for the intermediate light source's laser beam to pass through. Insufficient space can cause the light from the intermediate light source to be unintendedly reflected by the back edges of the mirrors. This results in the inability to effectively compress the dimensions of the optomechanical light source components along the X-axis. Summary of the Invention

[0005] To solve the above-mentioned technical problems, this utility model proposes a laser light source device and projection equipment, which can significantly reduce the volume of the optomechanical light source part.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, this utility model discloses a laser source device, including a first laser, a second laser, a third laser, and an optical mirror assembly. The optical mirror assembly includes a first reflector and a second reflector. The output light path of the first laser is aligned with the first reflector to reflect the light emitted by the first laser towards the main axis direction, and the output light path of the second laser is aligned with the second reflector to reflect the light emitted by the second laser towards the main axis direction. The output light paths of the first laser and the second laser are offset from each other and are both parallel to a first direction. The first reflector and the second reflector form a space between them in the first direction. The emission direction of the third laser is parallel to the main axis direction, and the output light path of the third laser passes through the space between them. The first reflector is located on the side of the output light path of the third laser away from the first laser, and the second reflector is located on the side of the output light path of the third laser away from the second laser.

[0007] Preferably, the optical mirror assembly further includes a first optical mirror group, a second optical mirror group, and a third optical mirror group. The first optical mirror group faces the first laser so that the light emitted by the first laser exits directly through the first reflector. The second optical mirror group faces the second laser so that the light emitted by the second laser exits directly through the second reflector. The third optical mirror group faces the third laser so that the light emitted by the third laser exits directly through the space.

[0008] Preferably, the first laser includes multiple rows of first LED beads, and the first optical lens group includes a first dichroic mirror and a first polarizing mirror. Each first dichroic mirror and each first polarizing mirror are respectively aligned with a row of first LED beads in the first direction. Each row of first LED beads is arranged along the main axis direction, and each first dichroic mirror and each first polarizing mirror are spaced apart in the main axis direction. The first dichroic mirror is used to reflect the light emitted by the corresponding first LED bead to the first polarizing mirror. The first polarizing mirror is used to transmit the light emitted by the corresponding first LED bead and reflect the light from each first dichroic mirror along the first direction. The outgoing light path of the first polarizing mirror is aligned with the first mirror in the first direction.

[0009] Preferably, the second laser includes multiple rows of second LEDs, and the second optical lens group includes a second dichroic mirror and a second polarizing mirror. Each second dichroic mirror and each second polarizing mirror are respectively positioned opposite a row of second LEDs in the first direction. Each row of second LEDs is arranged along the main axis, and each second dichroic mirror and each second polarizing mirror are spaced apart in the main axis. The second dichroic mirror is used to reflect the light emitted by the corresponding second LED to the second polarizing mirror, and the second polarizing mirror is used to transmit the light emitted by the corresponding second LED and reflect the light from each second dichroic mirror along the first direction. The outgoing light path of the second polarizing mirror is opposite the second mirror in the first direction.

[0010] Preferably, the third laser includes multiple rows of third LED beads, and the third optical lens group includes a third dichroic mirror and a third polarizing mirror. Each third dichroic mirror and each third polarizing mirror are respectively positioned opposite a row of third LED beads along the main axis direction. Each row of third LED beads is arranged along the first direction, and each third dichroic mirror and each third polarizing mirror are spaced apart along the first direction. The third dichroic mirror is used to reflect the light emitted by the corresponding third LED bead to the third polarizing mirror, and the third polarizing mirror is used to transmit the light emitted by the corresponding third LED bead and reflect the light from each third dichroic mirror along the main axis direction. The outgoing light path of the third polarizing mirror passes through the space between the two mirrors.

[0011] Preferably, the optical mirror assembly further includes a collimating lens group, which is disposed on the optical path along the main axis direction. The output light path of the third laser passes through the gap space and is incident on the center of the collimating lens group. The light reflected by the first laser and the light reflected by the second laser are respectively incident on the collimating lens group symmetrically about the center of the collimating lens group.

[0012] Preferably, the collimating lens group includes a convex lens and a concave lens, the convex lens and the concave lens are matched with each other, the convex lens and the concave lens are arranged sequentially along the outgoing light path in the main axis direction, and the convex surface of the convex lens is located away from the concave lens, and the concave surface of the concave lens is located away from the convex lens.

[0013] Preferably, the optical mirror assembly further includes a depolarizer, which is disposed on the optical path along the main axis direction.

[0014] Preferably, the optical lens assembly further includes a lens with a double lens disposed on the optical path along the main axis.

[0015] Secondly, this utility model discloses a projection device, including the laser light source device described in the first aspect.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: The laser source device of this utility model includes three lasers, wherein the first laser and the second laser are respectively corresponding to the first reflector and the second reflector. The first reflector and the second reflector form a space in the first direction to allow the laser beam of the third laser located in the middle to pass through. This allows the first reflector and the second reflector to be closer together without obstructing the beam of the third laser. In order to allow the two reflectors to be as close as possible in optical design, a significant reduction in size in the first direction is achieved, and the size of the optomechanical source part can be effectively compressed. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the laser source device disclosed in a preferred embodiment of the present invention.

[0018] Explanation of icon numbers: 10. First laser; 11. First LED bead; 11A. First A LED bead; 11B. First B LED bead; 11C. First C LED bead; 11D. First D LED bead; 20. Second laser; 21. Second LED; 21A. Second A LED; 21B. Second B LED; 21C. Second C LED; 21D. Second D LED; 30. Third laser; 31. Third LED bead; 31A. Third A LED bead; 31B. Third B LED bead; 31C. Third C LED bead; 31D. Third D LED bead; 41. First reflecting mirror; 42. Second reflecting mirror; 43. First optical mirror group; 431. First dichroic mirror; 431A. First A dichroic mirror; 431B. First B dichroic mirror; 431C. First C dichroic mirror; 432. First polarizing mirror; 433. First half-wave plate; 44. Second optical mirror group; 441. Second dichroic mirror; 441A. Second A dichroic mirror; 441B. Second B dichroic mirror; 441C. Second C dichroic mirror; 442. Second polarizing mirror; 443. Second half-wave plate; 45. Third optical mirror group; 451. Third dichroic mirror; 451A. Third A dichroic mirror; 451B. Third B dichroic mirror; 451C. Third C dichroic mirror; 452. Third polarizing mirror; 453. Third half-wave plate; 46. ​​Collimating lens group; 461. Convex lens; 462. Concave lens; 47. Depolarizing lens; 48. Compound lens; 50. Spacing. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. It should be emphasized that the following description is merely exemplary and not intended to limit the scope and application of this utility model.

[0020] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component. Furthermore, a connection can be used for both fixing and circuit / signal connectivity.

[0021] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] like Figure 1As shown, a preferred embodiment of this utility model discloses a laser source device, including a first laser 10, a second laser 20, a third laser 30, and an optical mirror assembly. The optical mirror assembly includes a first reflector 41 and a second reflector 42. The output light path of the first laser 10 is aligned with the first reflector 41 to reflect the light emitted by the first laser 10 towards the main axis, and the output light path of the second laser 20 is aligned with the second reflector 42 to reflect the light emitted by the second laser 20 towards the main axis. The first laser 10... The output light path of the first laser 10 is offset from that of the second laser 20 and both are parallel to the first direction. The first reflector 41 and the second reflector 42 form a space 50 in the first direction. The emission direction of the third laser 30 is parallel to the main axis direction, and the output light path of the third laser 30 passes through the space 50. The first reflector 41 is located on the side of the output light path of the third laser 30 away from the first laser 10, and the second reflector 42 is located on the side of the output light path of the third laser 30 away from the second laser 20. In this embodiment, the main axis direction refers to the main optical axis direction in which the beams finally converge and are emitted, and the main axis direction is parallel to the Z-axis direction. The first direction refers to the direction that is perpendicular to the main axis direction and parallel to the optical paths of the first laser 10 and the second laser 20, that is, the first direction is parallel to the X-axis.

[0024] In a further embodiment, the optical mirror assembly also includes a first optical mirror group 43, a second optical mirror group 44, and a third optical mirror group 45. The first optical mirror group 43 faces the first laser 10 so that the light emitted by the first laser 10 exits directly through the first reflector 41. The second optical mirror group 44 faces the second laser 20 so that the light emitted by the second laser 20 exits directly through the second reflector 42. The third optical mirror group 45 faces the third laser 30 so that the light emitted by the third laser 30 exits directly through the space 50.

[0025] In some embodiments, the first laser 10 includes multiple rows of first lamp beads 11, and the first optical lens group 43 includes a first dichroic mirror 431 and a first polarizing mirror 432. Each first dichroic mirror 431 and the first polarizing mirror 432 are respectively facing a row of first lamp beads 11 in a first direction. Each row of first lamp beads 11 is arranged along the main axis direction, and each first dichroic mirror 431 and the first polarizing mirror 432 are spaced apart in the main axis direction. The first dichroic mirror 431 is used to reflect the light emitted by the corresponding first lamp bead 11 to the first polarizing mirror 432. The first polarizing mirror 432 is used to transmit the light emitted by the corresponding first lamp bead 11 and reflect the light from each first dichroic mirror 431 along the first direction, wherein the outgoing light path of the first polarizing mirror 432 is facing the first mirror 41 in the first direction.

[0026] In some embodiments, the second laser 20 includes multiple rows of second LED beads 21, and the second optical lens group 44 includes a second dichroic mirror 441 and a second polarizing mirror 442. Each second dichroic mirror 441 and the second polarizing mirror 442 are respectively aligned with a row of second LED beads 21 in a first direction. Each row of second LED beads 21 is arranged along the main axis direction, and each second dichroic mirror 441 and the second polarizing mirror 442 are spaced apart in the main axis direction. The second dichroic mirror 441 is used to reflect the light emitted by the corresponding second LED bead 21 to the second polarizing mirror 442. The second polarizing mirror 442 is used to transmit the light emitted by the corresponding second LED bead 21 and reflect the light from each second dichroic mirror 441 in the first direction. The outgoing light path of the second polarizing mirror 442 is aligned with the second mirror 42 in the first direction.

[0027] In some embodiments, the third laser 30 includes multiple rows of third lamp beads 31, and the third optical lens group 45 includes a third dichroic mirror 451 and a third polarizing mirror 452. Each third dichroic mirror 451 and the third polarizing mirror 452 are respectively aligned with a row of third lamp beads 31 in the main axis direction. Each row of third lamp beads 31 is arranged along a first direction, and each third dichroic mirror 451 and the third polarizing mirror 452 are spaced apart in the first direction. The third dichroic mirror 451 is used to reflect the light emitted by the corresponding third lamp bead 31 to the third polarizing mirror 452. The third polarizing mirror 452 is used to transmit the light emitted by the corresponding third lamp bead 31 and reflect the light from each third dichroic mirror 451 in the main axis direction. The outgoing light path of the third polarizing mirror 452 passes through the spacer space 50.

[0028] In one specific embodiment, the first laser 10, the second laser 20, and the third laser 30 are RGB three-color lasers with the same specifications. The first laser 10, the second laser 20, and the third laser 30 are respectively disposed on three different sides, and the outgoing light paths of the first laser 10 and the second laser 20 are misaligned and opposite in the X-axis direction.

[0029] The first laser 10 includes four rows of first lamp beads 11, namely a row of first A lamp beads 11A for emitting green light, a row of first B lamp beads 11B for emitting blue light, and a row of first C lamp beads 11C and a row of first D lamp beads 11D for emitting red light. The first A lamp beads 11A, the first B lamp beads 11B, the first C lamp beads 11C and the first D lamp beads 11D are arranged sequentially along the main axis. The polarization states of the first A lamp beads 11A for emitting green light and the first B lamp beads 11B for emitting blue light are the same, and the polarization states of the first C lamp beads 11C and the first D lamp beads 11D for emitting red light are perpendicular to each other. The first dichroic mirror 431 includes a first A dichroic mirror 431A, a first B dichroic mirror 431B, and a first C dichroic mirror 431C. The first optical lens group 43 also includes a first half-wave plate 433. The light-emitting side of the first A lamp bead 11A faces the first A dichroic mirror 431A, which reflects green light and reflects the light from the first A lamp bead 11A to the first B dichroic mirror 431B. The light-emitting side of the first B lamp bead 11B faces the first B dichroic mirror 431B, which reflects blue light and transmits green light and reflects the light from the first B lamp bead 11B to the first C lamp bead 11C. The light-emitting side of the first C lamp bead 11C faces the first half-wave plate 433 and the first C dichroic mirror 431C. The first half-wave plate 433 is used to reflect green light and transmit blue light. The polarization state of the light beam emitted by the first C-type LED 11C is adjusted to be the same as that of the first A-type LED 11A and the first B-type LED 11B. The first C-type dichroic mirror 431C reflects red light and transmits green and blue light to the first polarizing mirror 432. The light-emitting side of the first D-type LED 11D faces the first polarizing mirror 432. The polarization direction of the light beams from the first A-type LED 11A, the first B-type LED 11B, and the first C-type LED 11C is perpendicular to the polarization direction of the light beam from the first D-type LED 11D. The first polarizing mirror 432 can transmit light with a certain polarization direction and reflect light perpendicular to that polarization direction. In this specific embodiment, the first polarizing mirror 432 is used to transmit the light from the first D-type LED 11D and reflect the light from the first A-type LED 11A, the first B-type LED 11B, and the first C-type LED 11C. In this way, the polarization states of the two beams of red light exiting through the first polarizing mirror 432 are perpendicular to each other, thereby further reducing the overall coherence of the red light while maintaining high brightness.

[0030] The second laser 20 includes four rows of second LED beads 21, namely a row of second A LED beads 21A for emitting green light, a row of second B LED beads 21B for emitting blue light, and a row of second C LED beads 21C and a row of second D LED beads 21D for emitting red light. The row of second A LED beads 21A, the row of second B LED beads 21B, the row of second C LED beads 21C and the row of second D LED beads 21D are arranged sequentially along the main axis. The polarization states of the row of second A LED beads 21A for emitting green light and the row of second B LED beads 21B for emitting blue light are the same, and the polarization states of the row of second C LED beads 21C and the row of second D LED beads 21D for emitting red light are perpendicular to each other. The second dichroic mirror 441 includes a second A dichroic mirror 441A, a second B dichroic mirror 441B, and a second C dichroic mirror 441C. The second optical lens group 44 also includes a second half-wave plate 443. The light-emitting side of the second A lamp bead 21A faces the second A dichroic mirror 441A, which reflects green light and reflects the light from the second A lamp bead 21A to the second B dichroic mirror 441B. The light-emitting side of the second B lamp bead 21B faces the second B dichroic mirror 441B, which reflects blue light and transmits green light and reflects the light from the second B lamp bead 21B to the second C lamp bead 21C. The light-emitting side of the second C lamp bead 21C faces the second half-wave plate 443 and the second C dichroic mirror 441C. The second half-wave plate 443 is used to reflect the light from the second A lamp bead 21A to the second C lamp bead 21C. The polarization state of the light beam emitted by the second C-type LED 21C is adjusted to be the same as that of the second A-type LED 21A and the second B-type LED 21B. The second C-type dichroic mirror 441C reflects red light and transmits green and blue light to the second polarizing mirror 442. The light-emitting side of the second D-type LED 21D faces the second polarizing mirror 442. The polarization direction of the light beams from the second A-type LED 21A, the second B-type LED 21B, and the second C-type LED 21C is perpendicular to the polarization direction of the light beam from the second D-type LED 21D. The second polarizing mirror 442 can transmit light with a certain polarization direction and reflect light with a polarization direction perpendicular to that direction. In this specific embodiment, the second polarizing mirror 442 is used to transmit the light from the second D-type LED 21D and reflect the light from the second A-type LED 21A, the second B-type LED 21B, and the second C-type LED 21C. In this way, the polarization states of the two beams of red light exiting through the second polarizing mirror 442 are perpendicular to each other, thereby further reducing the overall coherence of the red light while maintaining high brightness.

[0031] The third laser 30 includes four rows of third LED beads 31, namely a row of third A LED beads 31A for emitting green light, a row of third B LED beads 31B for emitting blue light, and a row of third C LED beads 31C and a row of third D LED beads 31D for emitting red light. The row of third A LED beads 31A, the row of third B LED beads 31B, the row of third C LED beads 31C and the row of third D LED beads 31D are arranged sequentially along the X-axis. The polarization states of the row of third A LED beads 31A for emitting green light and the row of third B LED beads 31B for emitting blue light are the same, and the polarization states of the row of third C LED beads 31C and the row of third D LED beads 31D for emitting red light are perpendicular to each other. The third dichroic mirror 451 includes a third A dichroic mirror 451A, a third B dichroic mirror 451B, and a third C dichroic mirror 451C. The third optical lens group 45 also includes a third half-wave plate 453. The light-emitting side of the third A lamp bead 31A faces the third A dichroic mirror 451A, which reflects green light and reflects the light from the third A lamp bead 31A to the third B dichroic mirror 451B. The light-emitting side of the third B lamp bead 31B faces the third B dichroic mirror 451B, which reflects blue light and transmits green light, reflecting the light from the third B lamp bead 31B to the third C lamp bead 31C. The light-emitting side of the third C lamp bead 31C faces the third half-wave plate 453 and the third C dichroic mirror 451C. The third half-wave plate 453 is used to reflect green light and transmit blue light. The polarization state of the light beam emitted by the third C lamp bead 31C is adjusted to be the same as that of the third A lamp bead 31A and the third B lamp bead 31B. The third C dichroic mirror 451C reflects red light and transmits green and blue light to the third polarizing mirror 452. The light-emitting side of the third D lamp bead 31D faces the third polarizing mirror 452. The polarization direction of the light beams from the third A lamp bead 31A, the third B lamp bead 31B, and the third C lamp bead 31C is perpendicular to the polarization direction of the light beam from the third D lamp bead 31D. The third polarizing mirror 452 can transmit light with a certain polarization direction and reflect light with a polarization direction perpendicular to that direction. In this specific embodiment, the third polarizing mirror 452 is used to transmit the light from the third D lamp bead 31D and reflect the light from the third A lamp bead 31A, the third B lamp bead 31B, and the third C lamp bead 31C. In this way, the polarization states of the two beams of red light coming out of the third polarizing mirror 452 are perpendicular to each other, thereby further reducing the overall coherence of the red light while maintaining high brightness.

[0032] It should be noted that the above description of the combination of multiple rows of LEDs, dichroic mirrors, and polarizing mirrors inside the first laser 10, the second laser 20, and the third laser 30 is merely an example of a preferred method for achieving multi-color laser beam combining. The core of this invention lies in the spatial relationship between the first reflector 41, the second reflector 42, and the three lasers. This relationship also applies to the laser module emitting the combined beam and does not depend on the specific beam combining structure inside the laser.

[0033] In some embodiments, the optical mirror assembly further includes a collimating lens group 46, which is disposed on the optical path along the main axis. The outgoing light path of the third laser 30 passes through the spacer 50 and is incident on the center of the collimating lens group 46. The light reflected by the first reflector 41 from the first laser 10 and the light reflected by the second reflector 42 from the second laser 20 are respectively incident on the collimating lens group 46 symmetrically about the center of the collimating lens group 46.

[0034] Specifically, the first reflector 41 is opposite to the first laser 10 along the X-axis, and the beam of the third laser 30 passes between them along the Z-axis. The first reflector 41 is used to reflect the beam of the first laser 10 at a 45° angle to the collimating lens group 46. The second reflector 42 is opposite to the second laser 20 along the X-axis, and the beam of the third laser 30 passes between them along the Z-axis. The second reflector 42 is used to reflect the beam of the second laser 20 at a 45° angle to the collimating lens group 46. The first reflector 41 and the second reflector 42 are offset in both the X-axis and Z-axis directions, and a gap space 50 is formed between the first reflector 41 and the second reflector 42 in the X-axis direction to allow the laser beam of the third laser 30 to pass through. The reflecting surfaces of the first reflector 41 and the second reflector 42 are both tilted towards the optical path from the third laser 30 to the collimating lens group 46. This misalignment allows the first reflector 41 and the second reflector 42 corresponding to the first laser 10 and the second laser 20 to be closer to each other in the X-axis direction without blocking the beam of the third laser 30, which is beneficial for the optical-mechanical compression of the size of the light source part in the X-axis direction.

[0035] In some embodiments, the collimating lens group 46 includes a convex lens 461 and a concave lens 462, which are matched to each other. The convex lens 461 and the concave lens 462 are arranged sequentially along the outgoing light path in the main axis direction, with the convex surface of the convex lens 461 located away from the concave lens 462, and the concave surface of the concave lens 462 located away from the convex lens 461. The convex lens 461 and the concave lens 462 can compress the spatial arrangement of the beams emitted by the first laser 10, the second laser 20, and the third laser 30 in the X-axis direction, thereby reducing the optical spread of the synthesized beam in this direction. This allows the beam shape reaching the projection lens to be closer to a circle, better adapting to the lens aperture. The focal length, curvature, and other parameters of the convex lens 461 and the concave lens 462 can be matched and selected according to the specific wavelength and divergence angle of the beams emitted by the first laser 10, the second laser 20, and the third laser 30 to achieve effective compression of the synthesized beam in the X-axis direction. Those skilled in the art can select and adjust according to actual optical design requirements.

[0036] In other embodiments, the collimating lens group 46 may also be a cylindrical lens compression system.

[0037] Following the collimating lens group 46, a depolarizer 47 and a double spectacle lens 48 are also provided along the optical path in the principal axis direction. The depolarizer 47 is used to convert polarized light into unpolarized light to prevent subsequent interference from causing speckle formation in the image. The double spectacle lens 48 can spatially disperse the laser beam, further disrupting the distribution of beams with the same polarization state and reducing interference.

[0038] Another preferred embodiment of this utility model discloses a projection device, including the laser light source device in the above preferred embodiment.

[0039] The background section of this utility model may include background information about the problems or circumstances surrounding the present utility model, rather than a description of prior art by others. Therefore, the content included in the background section is not an admission of prior art by the applicant.

[0040] The above description, in conjunction with specific / preferred embodiments, provides a further detailed explanation of the present invention and should not be construed as limiting the specific implementation of the present invention to these descriptions. For those skilled in the art, various substitutions or modifications can be made to these described embodiments without departing from the concept of the present invention, and all such substitutions or modifications should be considered within the protection scope of the present invention. In the description of this specification, the reference to terms such as "an embodiment," "some embodiments," "preferred embodiment," "example," "specific example," or "some examples," etc., indicates that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples. Although embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations may be made herein without departing from the scope defined by the appended claims.

Claims

1. A laser source device, characterized in that, It includes a first laser, a second laser, a third laser, and an optical mirror assembly, wherein the optical mirror assembly includes a first reflector and a second reflector; The output light path of the first laser is aligned with the first reflector to reflect the light emitted by the first laser towards the main axis, and the output light path of the second laser is aligned with the second reflector to reflect the light emitted by the second laser towards the main axis; wherein, the output light paths of the first laser and the second laser are offset from each other and are both parallel to the first direction, and the first reflector and the second reflector form a space between them in the first direction; The emission direction of the third laser is parallel to the main axis direction, and the output light path of the third laser passes through the interval space. The first reflector is located on the side of the output light path of the third laser away from the first laser, and the second reflector is located on the side of the output light path of the third laser away from the second laser.

2. The laser source device according to claim 1, characterized in that, The optical mirror assembly further includes a first optical mirror group, a second optical mirror group, and a third optical mirror group. The first optical mirror group faces the first laser so that the light emitted by the first laser exits directly through the first reflector. The second optical mirror group faces the second laser so that the light emitted by the second laser exits directly through the second reflector. The third optical mirror group faces the third laser so that the light emitted by the third laser exits directly through the space.

3. The laser source device according to claim 2, characterized in that, The first laser includes multiple rows of first lamp beads, and the first optical lens group includes a first dichroic mirror and a first polarizing mirror. Each first dichroic mirror and each first polarizing mirror are respectively facing a row of first lamp beads in the first direction. Each row of first lamp beads is arranged along the main axis direction, and each first dichroic mirror and each first polarizing mirror are arranged at intervals in the main axis direction. The first dichroic mirror is used to reflect the light emitted by the corresponding first lamp bead to the first polarizing mirror. The first polarizing mirror is used to transmit the light emitted by the corresponding first lamp bead and reflect the light from each of the first dichroic mirrors along the first direction. The outgoing light path of the first polarizing mirror is directly opposite the first mirror in the first direction.

4. The laser source device according to claim 2, characterized in that, The second laser includes multiple rows of second LEDs, and the second optical lens group includes a second dichroic mirror and a second polarizing mirror. Each second dichroic mirror and each second polarizing mirror are respectively facing a row of second LEDs in the first direction. Each row of second LEDs is arranged along the main axis direction, and each second dichroic mirror and each second polarizing mirror are arranged at intervals in the main axis direction. The second dichroic mirror is used to reflect the light emitted by the corresponding second lamp bead to the second polarizing mirror. The second polarizing mirror is used to transmit the light emitted by the corresponding second lamp bead and reflect the light from each of the second dichroic mirrors along the first direction. The outgoing light path of the second polarizing mirror is directly opposite the second mirror in the first direction.

5. The laser source device according to claim 2, characterized in that, The third laser includes multiple rows of third lamp beads, and the third optical lens group includes a third dichroic mirror and a third polarizing mirror. Each of the third dichroic mirrors and the third polarizing mirrors is directly opposite a row of the third lamp beads in the main axis direction. Each row of the third lamp beads is arranged along the first direction, and each of the third dichroic mirrors and the third polarizing mirrors is arranged at intervals in the first direction. The third dichroic mirror is used to reflect the light emitted by the corresponding third lamp bead to the third polarizing mirror. The third polarizing mirror is used to transmit the light emitted by the corresponding third lamp bead and reflect the light from each of the third dichroic mirrors along the main axis direction. The outgoing light path of the third polarizing mirror passes through the interval space.

6. The laser source device according to claim 1, characterized in that, The optical mirror assembly further includes a collimating lens group, which is disposed on the optical path along the main axis. The output light path of the third laser passes through the gap space and is incident on the center of the collimating lens group. The light reflected by the first laser and the light reflected by the second laser are respectively incident on the collimating lens group symmetrically about the center of the collimating lens group.

7. The laser source device according to claim 6, characterized in that, The collimating lens group includes a convex lens and a concave lens. The convex lens and the concave lens are matched with each other. The convex lens and the concave lens are arranged sequentially along the outgoing light path in the direction of the main axis. The convex surface of the convex lens is located away from the concave lens, and the concave surface of the concave lens is located away from the convex lens.

8. The laser source device according to claim 1, characterized in that, The optical mirror assembly also includes a depolarizer, which is disposed on the optical path along the main axis.

9. The laser source device according to claim 1, characterized in that, The optical lens assembly also includes a double lens, which is disposed on the optical path along the main axis.

10. A projection device, characterized in that, Includes the laser source device according to any one of claims 1 to 9.

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