Laser projection light source and laser projection equipment

Abstract

The present invention discloses a laser projection light source and laser projection equipment. The laser projection light source includes: a housing, multiple lasers, and multiple light combining mirror groups corresponding to the lasers. The light combining mirror groups include multiple reflectors. The multiple lasers are mounted at multiple accommodating openings on a first sidewall, and a light outlet is provided on a second sidewall perpendicular to the first sidewall. The light exit surface of at least one laser includes a first light exit area, a second light exit area, and a third light exit area, respectively for emitting a first color light beam, a second color light beam, and a third color light beam with different polarization directions. A first wave plate is provided between the third light exit area and the third reflector. The laser projection light source of the present invention is used in laser projection equipment.

Description

[0001] This application is based on Chinese invention application No. 201911024401.X (2019-10-25), invention name

[0002] Title: Divisional application for a laser projection light source and a laser projection device Technical Field

[0003] The present invention relates to the technical field of laser projection equipment, and in particular to a laser projection light source and a laser projection equipment. Background Art

[0004] Laser projection light sources are a crucial component of laser projection equipment, such as laser TVs and laser projectors, providing the illumination beam. To increase the brightness of the beam emitted by a laser projection light source, multiple lasers can be incorporated into the source. By combining the beams from these multiple lasers into a single beam, the brightness of the laser projection light source can be multiplied. However, since lasers are typically monochromatic lasers (e.g., blue, red, or green lasers), and the beam emitted by a laser projection light source is a white light beam, multiple fluorescent wheels are required within the laser projection light source to correspond one-to-one with the multiple lasers. Each fluorescent wheel generates two other colors of laser light under the excitation of the monochromatic laser light emitted by the laser corresponding to the fluorescent wheel. The two other colors of laser light mix with the monochromatic laser light emitted by the laser to form white light. To achieve the purpose of light mixing, multiple sets of lenses are required within the laser projection light source to correspond one-to-one with the multiple fluorescent wheels. Each set of lenses is used to change the transmission path of the two other colors of laser light so that the two other colors of laser light mix with the monochromatic laser light emitted by the laser. After the white light is mixed to form white light, the multiple beams of white light are combined into one beam to increase the brightness of the beam emitted by the laser projection light source. This results in the laser projection light source including a large number of components, thereby increasing the structural complexity and volume of the laser projection light source. Summary of the Invention

[0005] The present invention provides a laser projection light source and a laser projection device, which are used to solve the problem of how to reduce the volume and structural complexity of the laser projection light source while improving the brightness of the light beam emitted by the laser projection light source.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] In the first aspect, an embodiment of the present invention provides a laser projection light source, comprising: a shell, multiple lasers and an optical path assembly, the shell comprising a first side wall and a second side wall perpendicular to each other, the first side wall being provided with multiple accommodating openings, and the second side wall being provided with a light outlet; multiple lasers are respectively installed at the multiple accommodating openings, each laser emits light toward the shell, and the light outlet surface of each laser includes multiple light outlet areas, which are used to emit light of multiple colors; the optical path assembly is arranged in the shell, and the optical path assembly is used to combine the multiple colors of light emitted by the multiple lasers, and make the combined multiple beams of light emitted toward the light outlet.

[0008] In some embodiments, the plurality of accommodating openings are arranged in a row along a direction perpendicular to the second side wall.

[0009] In some embodiments, the optical path assembly includes multiple light-combining lens groups and multiple reflectors; the number of the multiple light-combining lens groups is equal to the number of the multiple lasers, and the multiple light-combining lens groups correspond one-to-one to the multiple lasers, and each light-combining lens group is used to combine the multiple colors of light emitted by the laser corresponding to the light-combining lens group; the number of the multiple reflectors is equal to the number of the multiple light-combining lens groups, and the multiple reflectors correspond one-to-one to the multiple light-combining lens groups, and each reflector is used to change the transmission path of the output light beam of the light-combining lens group corresponding to the reflector, so that the output light beam of the light-combining lens group is emitted toward the light outlet.

[0010] In some embodiments, the light-emitting surface of each laser includes a first light-emitting area, a second light-emitting area, and a third light-emitting area; the first light-emitting area is used to emit a first color light beam; the second light-emitting area is used to emit a second color light beam; the third light-emitting area is used to emit a third color light beam; the first color light beam, the second color light beam, and the third color light beam are combined to form a white light beam.

[0011] In some embodiments, the first light emitting area, the second light emitting area, and the third light emitting area of ​​each laser are arranged in sequence; each light combining lens group includes a first reflective lens, a second reflective lens, and a third reflective lens, the first reflective lens is located on the light emitting side of the first light emitting area of ​​the laser corresponding to the light combining lens group, and the first reflective lens reflects the first color light beam emitted from the first light emitting area, the second reflective lens is located on the second light emitting area of ​​the laser corresponding to the light combining lens group and the light emitting side of the first reflective lens, the second reflective lens reflects the second color light beam emitted from the second light emitting area and transmits the first color light beam reflected by the first reflective lens, the third reflective lens is located on the third light emitting area of ​​the laser corresponding to the light combining lens group, the first reflective lens, and the light emitting side of the second reflective lens, the third reflective lens reflects the third color light beam emitted from the third light emitting area and transmits the first color light beam reflected by the first reflective lens and the second color light beam reflected by the second reflective lens; the optical axis of the first color light beam reflected by the first reflective lens, the optical axis of the second color light beam reflected by the second reflective lens, and the optical axis of the third color light beam reflected by the third reflective lens are collinear.

[0012] In some embodiments, an arrangement direction of the first light exiting area, the second light exiting area, and the third light exiting area is perpendicular to an arrangement direction of the plurality of lasers.

[0013] In some embodiments, the angles between the reflective surfaces of the first reflective lens, the reflective surfaces of the second reflective lens, and the reflective surfaces of the third reflective lens of each light-combining lens group and the light-emitting surface of the laser corresponding to the light-combining lens group are all 45°±2°.

[0014] In some embodiments, the distance between the first reflective lens and the first light exit area on the central axis of the first light exit area is a first distance; the distance between the second reflective lens and the second light exit area on the central axis of the second light exit area is a second distance; the distance between the third reflective lens and the third light exit area on the central axis of the third light exit area is a third distance; the first distance, the second distance and the third distance are all 1 to 6 mm.

[0015] In some embodiments, the first color light beam emitted from the first light exit area is one of a blue light beam and a green light beam, the second color light beam emitted from the second light exit area is the other of the blue light beam and the green light beam, and the third color light beam emitted from the third light exit area is a red light beam.

[0016] In some embodiments, the polarization direction of the first color light beam emitted from the first light exit area is the same as the polarization direction of the second color light beam emitted from the second light exit area, and the polarization direction of the second color light beam emitted from the second light exit area is perpendicular to the polarization direction of the third color light beam emitted from the third light exit area; a first wave plate is provided between the third light exit area and the third reflective lens, and the first wave plate is used to rotate the polarization direction of the third color light beam emitted from the third light exit area by 90°±10°.

[0017] In other embodiments, the polarization direction of the first color light beam emitted from the first light exit area is the same as the polarization direction of the second color light beam emitted from the second light exit area, and the polarization direction of the second color light beam emitted from the second light exit area is perpendicular to the polarization direction of the third color light beam emitted from the third light exit area; a second wave plate is arranged between the first light exit area and the first reflective lens, and a third wave plate is arranged between the second light exit area and the second reflective lens, the second wave plate is used to rotate the polarization direction of the first color light beam emitted from the first light exit area by 90°±10°, and the third wave plate is used to rotate the polarization direction of the second color light beam emitted from the second light exit area by 90°±10°.

[0018] In some embodiments, the second wave plate and the third wave plate are integrally formed.

[0019] In some embodiments, a shrinking lens is provided between the reflective element corresponding to the light combining lens group corresponding to the laser that is farther away from the light outlet among two adjacent lasers and the light outlet. The shrinking lens is used to reduce the divergence angle of the reflected light beam of the reflective element before the reflected light beam of the reflective element enters the light outlet.

[0020] In some embodiments, a spherical lens is installed in the light outlet, and the spherical lens can converge the light beam entering the light outlet.

[0021] In some embodiments, a light homogenizer is provided on the light incident side of the light outlet.

[0022] The present invention provides a laser projection light source, which combines the multiple colors of light emitted by multiple lasers through an optical path component, and makes the multiple beams of light after combining bends be emitted toward the light outlet to achieve the superposition of multiple beams of light, so that the laser projection light source has a higher brightness. At the same time, since the light-emitting surfaces of the lasers in the laser projection light source include multiple light-emitting areas, and the multiple light-emitting areas are used to emit light of multiple colors, there is no need to set a large number of lenses in the laser projection light source provided by the present invention, thereby reducing the volume and structural complexity of the laser projection light source. Moreover, since in the laser projection light source provided by the present invention, a plurality of accommodating openings are provided on the first side wall of the shell, and the multiple lasers are respectively installed at the plurality of accommodating openings, the circuit boards of the multiple lasers are coplanar, so a heat sink can be used to cool the multiple lasers at the same time, thereby reducing the cost and volume of the laser projection light source including the heat sink and the circuit board.

[0023] In the second aspect, an embodiment of the present invention provides a laser projection device, comprising a laser projection light source, an optical machine and a projection lens connected in sequence, wherein the laser projection light source is the laser projection light source described in any of the above technical solutions, the optical machine is used to modulate the illumination light beam emitted by the laser projection light source to generate an image light beam, and project the image light beam to the projection lens, and the projection lens is used to image the image light beam.

[0024] The present invention provides a laser projection device. Since the laser projection device includes the laser projection light source described in any of the above technical solutions, the laser projection device provided by the present invention and the laser projection light source described in the above technical solutions can solve the same technical problems and achieve the same expected effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A three-dimensional diagram of a first laser projection light source provided by an embodiment of the present invention;

[0027] Figure 2 A schematic structural diagram of the first laser projection light source provided by an embodiment of the present invention after removing the heat sink;

[0028] Figure 3 A schematic diagram of the internal structure of a first laser projection light source provided by an embodiment of the present invention;

[0029] Figure 4 A light path diagram of a first light path component in a first laser projection light source provided by an embodiment of the present invention;

[0030] Figure 5 A schematic structural diagram of a laser in a first laser projection light source provided by an embodiment of the present invention;

[0031] Figure 6 A schematic structural diagram of the laser, light combining lens group, and first wave plate in the first laser projection light source provided by an embodiment of the present invention;

[0032] Figure 7 A schematic structural diagram of the laser, light combining lens group, second wave plate, and third wave plate in the first laser projection light source provided by an embodiment of the present invention;

[0033] Figure 8A light path diagram of the second light path component in the first laser projection light source provided by an embodiment of the present invention;

[0034] Figure 9 A stereoscopic diagram of a second laser projection light source provided by an embodiment of the present invention;

[0035] Figure 10 This is a schematic structural diagram of a laser projection device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical connections; direct connections or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0038] Laser projection light source is an important component of laser projection equipment, and is used to provide illumination beam.

[0039] In a first aspect, an embodiment of the present invention provides a laser projection light source 1, such as Figure 1 、 Figure 2 and Figure 3 As shown, the laser projection light source 1 includes: a housing 11, a plurality of lasers 12 and an optical path component 13, wherein Figure 2 As shown, the housing 11 includes a first side wall 200 and a second side wall 300 that are perpendicular to each other. The first side wall 200 is provided with a plurality of accommodating openings 111, and the second side wall 300 is provided with a light outlet 112. The plurality of lasers 12 are respectively installed at the plurality of accommodating openings 111, and each laser 12 emits light toward the inside of the housing 11, as shown in FIG. Figure 5 As shown, the light-emitting surface of each laser 12 includes multiple light-emitting areas, and the multiple light-emitting areas are used to emit light of multiple colors; Figure 3 As shown, the optical path component 13 is disposed in the housing 11 , and is used to combine the lights of multiple colors emitted by the multiple lasers 12 , and emit the combined multiple beams of light toward the light outlet 112 .

[0040] The present invention provides a laser projection light source, such as Figure 3 As shown, the light of multiple colors emitted by multiple lasers 12 are combined by the optical path component 13, and the combined multiple beams are emitted toward the light outlet 112 to achieve the superposition of multiple beams, so that the laser projection light source has a higher brightness. Figure 5 As shown, since the light emitting surface of each laser in the laser projection light source 1 includes multiple light emitting areas, and the multiple light emitting areas are used to emit light of multiple colors, it is not necessary to set a large number of lenses in the laser projection light source 1 provided by the present invention, thereby reducing the volume and structural complexity of the laser projection light source 1. Moreover, since in the laser projection light source 1 provided by the present invention, as shown in FIG. Figure 2 As shown, a plurality of accommodating openings 111 are provided on the first side wall 200 of the housing 11, and a plurality of lasers 12 are respectively installed at the plurality of accommodating openings 111, so that the circuit boards 15 (such as Figure 2 As shown in FIG, the plurality of lasers 12 are coplanar, so a heat sink 16 can be used to cool the plurality of lasers 12 at the same time (as shown in FIG. Figure 1 As shown), the cost and volume of the laser projection light source 1 including the heat sink 16 and the circuit board 15 can be reduced.

[0041] The arrangement positions of the plurality of accommodating openings 111 on the first side wall 200 determine the arrangement positions of the plurality of lasers 12. In the embodiment of the present invention, the arrangement positions of the plurality of accommodating openings 111 on the first side wall 200 are not specifically limited. In some embodiments, as Figure 9 As shown, the plurality of accommodating openings 111 are arranged in a direction approximately parallel to the second side wall 300. At this time, the laser projection light source 1 is arranged in a direction perpendicular to the second side wall 300 (ie, Figure 9 In other embodiments, the size in the direction X) is smaller. Figure 2 As shown, the plurality of accommodating openings 111 are arranged in a row along a direction perpendicular to the second side wall 300, so that the laser projection light source 1 is arranged in a direction parallel to the first side wall 200 and the second side wall 300 (i.e. Figure 2 The size in the direction Y) is smaller.

[0042] The number of lasers 12 can be two, three, four, etc., and is not specifically limited here. The greater the number of lasers 12, the greater the brightness of the laser projection light source 1. The number of lasers 12 can be determined based on the brightness requirements of the laser projection light source 1. In some embodiments, Figure 2 As shown, the number of lasers 12 is two.

[0043] The light-emitting surface of the laser 12 may include two light-emitting areas, three light-emitting areas, or four light-emitting areas, etc., which are not specifically limited herein. Specifically, the number of light-emitting areas included in the light-emitting surface of the laser 12 is equal to the number of colors emitted by the light-emitting surface of the laser 12, and each light-emitting area is used to emit light of a different color.

[0044] In some embodiments, as Figure 5 As shown, the light-emitting surface of each laser 12 includes a first light-emitting area 121, a second light-emitting area 122, and a third light-emitting area 123. The first light-emitting area 121 is used to emit a first color light beam; the second light-emitting area 122 is used to emit a second color light beam; and the third light-emitting area 123 is used to emit a third color light beam. The first, second, and third color light beams are combined to form a white light beam. This simple structure eliminates the need for a fluorescent wheel within the laser projection light source 1, further reducing the size of the laser projection light source 1.

[0045] In the above embodiment, the colors of the first color light beam, the second color light beam and the third color light beam are not specifically limited, as long as the first color light beam, the second color light beam and the third color light beam can be mixed to form white light. Figure 5 As shown, the first color light beam emitted by the first light emitting area 121 is a blue light beam, the second color light beam emitted by the second light emitting area 122 is a green light beam, and the third color light beam emitted by the third light emitting area 123 is a red light beam. For another example, the first color light beam emitted by the first light emitting area 121 is a cyan light beam, the second color light beam emitted by the second light emitting area 122 is a yellow light beam, and the third color light beam emitted by the third light emitting area 123 is a magenta light beam.

[0046] The first light emitting area 121, the second light emitting area 122 and the third light emitting area 123 may correspond to one lamp bead in the laser 12, or may correspond to one row of lamp bead in the laser 12, or may correspond to multiple rows of lamp bead in the laser 12, which is not specifically limited here. In some embodiments, Figure 5 As shown, the third light emitting area 123 corresponds to two rows of lamp beads in the laser 12, and the first light emitting area 121 and the second light emitting area 122 each correspond to a row of lamp beads in the laser 12. Each row of lamp beads includes 6 lamp beads.

[0047] In some embodiments, as Figure 3 As shown, a spherical lens 14 is installed in the light outlet, and the spherical lens 14 can converge the light beam entering the light outlet. In this way, the optical elements (such as Figure 4 The size of the light pipe 100 in the laser projection apparatus can be designed to be smaller, which is beneficial to reducing the size of the laser projection apparatus.

[0048] The optical path component 13 has various structural forms. For example, the structure of the optical path component 13 can have the following two embodiments:

[0049] Example 1, as Figure 4 As shown, the optical path assembly 13 includes a plurality of light-combining lens groups 131 and a plurality of reflectors 132. The number of the plurality of light-combining lens groups 131 is equal to the number of the plurality of lasers 12. The plurality of light-combining lens groups 131 correspond one-to-one to the plurality of lasers 12. Each light-combining lens group 131 is used to combine the multiple colors of light emitted by the laser 12 corresponding to the light-combining lens group 131. The number of the plurality of reflectors 132 is equal to the number of the plurality of light-combining lens groups 131. The plurality of reflectors 132 correspond one-to-one to the plurality of light-combining lens groups 131. Each reflector 132 is used to change the transmission path of the outgoing light beam of the light-combining lens group 131 corresponding to the reflector 132 so that the outgoing light beam of the light-combining lens group 131 is emitted toward the light outlet 112. The optical path component of this structure is simple and easy to implement. Moreover, multiple light-combining lens groups 131 can be respectively arranged close to multiple lasers 12 to avoid the light-combining lens group 131 being larger due to the larger light spot of the light beam emitted by the laser 12 when it enters the light-combining lens group 131.

[0050] In the above embodiment, the reflector 132 may be a lens or a prism, which is not specifically limited here. Figure 4 As shown, the reflective member 132 is a lens.

[0051] The light combining lens group 131 may include three lenses or three reflectors, which are not specifically limited here. Figure 5 As shown, the first light emitting area 121, the second light emitting area 122, and the third light emitting area 123 of each laser 12 are arranged in sequence; Figure 4As shown, each light-combining lens group 131 includes a first reflecting lens 1311, a second reflecting lens 1312 and a third reflecting lens 1313. The first reflecting lens 1311 is located at the light-emitting side of the first light-emitting area 121 of the laser 12 corresponding to the light-combining lens group 131. The first reflecting lens 1311 reflects the first color light beam emitted from the first light-emitting area 121. The second reflecting lens 1312 is located at the second light-emitting area 122 of the laser 12 corresponding to the light-combining lens group 131 and the light-emitting side of the first reflecting lens 1311. The second reflecting lens 1312 reflects the second color light beam emitted from the second light-emitting area 122 and transmits the second color light beam reflected by the first reflecting lens 1311. A color light beam, the third reflecting lens 1313 is located on the light emitting side of the third light emitting area 123 of the laser 12 corresponding to the light combining lens group 131, the first reflecting lens 1311 and the second reflecting lens 1312, the third reflecting lens 1313 reflects the third color light beam emitted from the third light emitting area 123 and transmits the first color light beam reflected by the first reflecting lens 1311 and the second color light beam reflected by the second reflecting lens 1312; the optical axis of the first color light beam reflected by the first reflecting lens 1311, the optical axis of the second color light beam reflected by the second reflecting lens 1312 and the optical axis of the third color light beam reflected by the third reflecting lens 1313 are collinear. In this way, the three color light beams emitted by the laser 12 can be combined by the first reflecting lens 1311, the second reflecting lens 1312 and the third reflecting lens 1313. At the same time, the first reflecting lens 1311, the second reflecting lens 1312 and the third reflecting lens 1313 can make a turn on the three color light beams emitted by the laser 12, thereby reducing the size of the laser projection light source 1 in the direction perpendicular to the light emitting surface of the laser 12, thereby further achieving the purpose of reducing the volume of the laser projection light source 1.

[0052] In the above embodiment, it should be known that it is difficult to ensure that the optical axis of the first color light beam after being reflected by the first reflecting lens 1311, the optical axis of the second color light beam after being reflected by the second reflecting lens 1312, and the optical axis of the third color light beam after being reflected by the third reflecting lens 1313 are absolutely collinear during the actual processing and installation of the laser projection light source 1. Therefore, the "collinearity" of the optical axis of the first color light beam after being reflected by the first reflecting lens 1311, the optical axis of the second color light beam after being reflected by the second reflecting lens 1312, and the optical axis of the third color light beam after being reflected by the third reflecting lens 1313 described in the embodiment of the present application cannot be understood as absolute collinearity, but should be understood as "collinear or approximately collinear". For example, the optical axis of the first color light beam reflected by the first reflecting lens 1311, the optical axis of the second color light beam reflected by the second reflecting lens 1312, and the optical axis of the third color light beam reflected by the third reflecting lens 1313 described in the embodiment of the present application are collinear, which means that, among the optical axis of the first color light beam reflected by the first reflecting lens 1311, the optical axis of the second color light beam reflected by the second reflecting lens 1312, and the optical axis of the third color light beam reflected by the third reflecting lens 1313, the distance between any two optical axes is less than a first specific value, and the angle between any two optical axes is less than a second specific value. The first specific value can be 1 mm, 2 mm, or 3 mm, etc., which is not specifically limited here. The second specific value can be 1°, 2°, or 3°, etc., which is not specifically limited here.

[0053] The first reflective lens 1311 can be a total reflection mirror, a dichroic lens, or other structures, which are not specifically limited here. Figure 4 As shown, the first reflective lens 1311 is a total reflection mirror.

[0054] The second reflective lens 1312 and the third reflective lens 1313 can be dichroic lenses or other structures, which are not specifically limited here. Figure 4 As shown, the second reflective lens 1312 and the third reflective lens 1313 are dichroic films.

[0055] The arrangement direction of the first light emitting area 121, the second light emitting area 122, and the third light emitting area 123 can be any direction parallel to the light emitting surface of the laser 12, and is not specifically limited here. Figure 2 As shown, the plurality of accommodating openings 111 are arranged in a row along a direction perpendicular to the second side wall 300, as shown in FIG. Figure 4As shown, the arrangement directions of the first light emitting area, the second light emitting area, and the third light emitting area (parallel to the arrangement directions of the first reflecting lens 1311, the second reflecting lens 1312, and the third reflecting lens 1313) are perpendicular to the arrangement direction of the multiple lasers 12. In this way, the light combining lens group 131 emits light in a direction perpendicular to the arrangement direction of the multiple lasers 12. The reflecting member 132 corresponding to the light combining lens group 131 is located on the light emitting path of the light combining lens group 131. The arrangement directions of the light combining lens group 131 and the reflecting member 132 are perpendicular to the arrangement direction of the multiple lasers 12. The size of the assembly composed of the light combining lens group 131 and the reflecting member 132 is smaller in the arrangement direction of the multiple lasers 12, which is beneficial to reducing the size of the laser projection light source 1 along the arrangement direction of the multiple lasers 12.

[0056] In some embodiments, as Figure 6 or Figure 7 As shown, the angles between the reflective surfaces of the first reflective lens 1311, the second reflective lens 1312, and the third reflective lens 1313 of each light-combining lens group 131 and the light-emitting surface of the laser 12 corresponding to the light-combining lens group 131 are all 45°±2°. In this way, by combining the three color light beams emitted by the laser 12 through the first reflective lens 1311, the second reflective lens 1312, and the third reflective lens 1313, the three color light beams emitted by the laser 12 are turned approximately 90°, which can significantly reduce the size of the laser projection light source 1 in the direction perpendicular to the light-emitting surface of the laser 12, thereby further achieving the purpose of reducing the volume of the laser projection light source 1.

[0057] In some embodiments, as Figure 6 As shown, the distance between the first reflective lens 1311 and the first light exit area 121 on the central axis l1 of the first light exit area 121 is a first distance h1, the distance between the second reflective lens 1312 and the second light exit area 122 on the central axis l2 of the second light exit area 122 is a second distance h2, and the distance between the third reflective lens 1313 and the third light exit area 123 on the central axis l3 of the third light exit area 123 is a third distance h3. The first distance h1, the second distance h2, and the third distance h3 are all 1 to 6 mm. In this way, the distance between the light combining lens group 131 and the laser 12 is moderate, which can reduce the size of the laser projection light source 1 in the direction perpendicular to the light exit surface of the laser 12, while avoiding collision damage between the light combining lens group 131 and the laser 12 during installation due to the close distance between the light combining lens group 131 and the laser 12.

[0058] In the above embodiment, it should be noted that Figure 6As shown, the central axis l1 of the first light emitting area 121 is an axis perpendicular to the light emitting surface of the laser 12 and passing through the center of the first light emitting area 121; the central axis l2 of the second light emitting area 122 is an axis perpendicular to the light emitting surface of the laser 12 and passing through the center of the second light emitting area 122; the central axis l3 of the third light emitting area 123 is an axis perpendicular to the light emitting surface of the laser 12 and passing through the center of the third light emitting area 123.

[0059] The light emitted from the light emitting surface of the laser 12 is emitted by the light emitting device (i.e., the lamp bead) inside the laser 12. Compared with the light emitting devices emitting lasers of other colors, the light emitting device emitting red light has a larger divergence angle of the light beam. On this basis, in order to avoid a larger light spot when the light beam emitted by the laser 12 is reflected by the light combining lens group 131 and the reflector 132 and transmitted to the light outlet 112, in some embodiments, such as Figure 5 As shown, the first color light beam emitted by the first light exit area 121 is one of a blue light beam and a green light beam, the second color light beam emitted by the second light exit area 122 is the other of the blue light beam and the green light beam, and the third color light beam emitted by the third light exit area 123 is a red light beam. In this way, compared with the first color light beam emitted by the first light exit area 121 and the second color light beam emitted by the second light exit area 122, the third color light beam emitted by the third light exit area 123 (that is, the red light beam) has a shorter transmission path between the light exit surface of the laser 12 and the light exit port 112, and the light spot formed at the light exit port 112 is smaller, which can prevent the light spot of the light beam emitted by the laser 12 from being too large when it is reflected by the light combining lens group 131 and the reflector 132 and transmitted to the light exit port 112, and is conducive to reducing the diameter of the spherical lens installed in the light exit port 112.

[0060] In some embodiments, as Figure 5 As shown, the polarization direction of the first color light beam emitted from the first light exit area 121 is the same as the polarization direction of the second color light beam emitted from the second light exit area 122, and the polarization direction of the second color light beam emitted from the second light exit area 122 is perpendicular to the polarization direction of the third color light beam emitted from the third light exit area 123.

[0061] In the above embodiment, in order to increase the light uniformity of the laser projection light source 1, the following two optional implementation methods can be used:

[0062] The first optional implementation method is Figure 6As shown, a first wave plate 135 is provided between the third light exit area 123 and the third reflector lens 1313. The first wave plate 135 is used to rotate the polarization direction of the third color light beam emitted from the third light exit area 123 by 90°±10°. In this way, the polarization direction of the light beam emitted from the third light exit area 123 is changed by the first wave plate 135, so that the polarization direction of the light beam emitted from the third light exit area 123 is consistent with the polarization direction of the light beam emitted from the first light exit area 121 or the second light exit area 122, thereby improving the light output uniformity of the laser projection light source 1.

[0063] The second optional implementation method is Figure 7 As shown, a second wave plate is provided between the first light exit area 121 and the first reflective lens 1311, and a third wave plate is provided between the second light exit area 122 and the second reflective lens 1312. The second wave plate is used to rotate the polarization direction of the second color light beam emitted from the first light exit area 121 by 90°±10°, and the third wave plate is used to rotate the polarization direction of the third color light beam emitted from the second light exit area 122 by 90°±10°. In this way, the polarization directions of the light beams emitted from the first light exit area 121 and the second light exit area 122 are respectively changed by the second wave plate and the third wave plate, so that the polarization directions of the light beams emitted from the first light exit area 121 and the second light exit area 122 are consistent with the polarization direction of the light beam emitted from the third light exit area 123, thereby improving the light uniformity of the laser projection light source 1.

[0064] In the above embodiment, optionally, Figure 7 As shown, the second wave plate and the third wave plate are integrally formed to form structure 136. In this way, the laser projection light source 1 includes fewer parts, and has lower structural complexity and assembly difficulty.

[0065] Furthermore, in order to avoid a larger light spot when the light beam emitted by the laser 12 is reflected by the light combining lens group 131 and the reflector 132 and transmitted to the light outlet 112, in some embodiments, as shown in FIG. Figure 4 As shown, a shrinking lens 134 is provided between the reflector 132 and the light outlet 112, and the light combining lens assembly 131 corresponding to the laser 12 that is farther from the light outlet 112. The shrinking lens 134 is used to reduce the divergence angle of the reflected light beam from the reflector 132 before the reflected light beam enters the light outlet. Thus, by reducing the divergence angle of the reflected light beam from the reflector 132 through the shrinking lens 134, the spot size of the reflected light beam when it is transmitted to the light outlet can be reduced.

[0066] In the above embodiment, since the divergence angle of the red light beam is larger than that of the green light beam and the blue light beam, and the divergence angle of the red light beam is divided into the divergence angle along the fast axis direction and the divergence angle along the slow axis direction, the divergence angle of the red light beam along the fast axis direction is much larger than the divergence angle along the slow axis direction. Therefore, in order to effectively avoid the light spot of the light beam emitted by the laser 12 being larger when it is reflected by the light-combining lens group 131 and the reflector 132 and transmitted to the light outlet 112, specifically, the light shrinking lens 134 is used to reduce the divergence angle of the reflected light beam along the fast axis direction of the red light beam in the reflected light beam before the reflected light beam of the reflector 132 enters the light outlet.

[0067] In order to improve the uniformity of the light beams emitted by the plurality of light combining lens groups 131 when they are combined into one light beam, in some embodiments, for example Figure 4 As shown, a light homogenizer 133 is provided on the light incident side of the light outlet 112. The light homogenizer 133 can improve the uniformity of the outgoing light beams of the multiple light combining lens groups 131 when they are combined into one light beam.

[0068] In some embodiments, the light homogenizer 133 is a diffuser or a fisheye lens.

[0069] Example 2, as Figure 8 As shown, the optical path assembly 13 includes multiple light-combining lens groups 131, each of which is used to combine the multiple colors of light emitted by the multiple lasers 12. The light beams emitted by the multiple light-combining lens groups 131 are then emitted toward the light outlet. This allows the optical path assembly 13 to have a simple structure, resulting in a small laser projection light source and low structural complexity, making it easy to implement.

[0070] In the above embodiment, in order to enable the light combining lens group 131 to combine the multiple colors of light emitted by the laser 12 and emit the combined light toward the light outlet 112, in some embodiments, such as Figure 8As shown, the first light emitting area 121, the second light emitting area 122, and the third light emitting area 123 are arranged in sequence along the arrangement direction of the multiple lasers 12 from the end away from the light outlet to the end close to the light outlet; each light combining lens group 131 includes a first reflecting lens 1311, a second reflecting lens 1312, and a third reflecting lens 1313. The first reflecting lens 1311 is located on the light emitting side of the first light emitting area 121 of the laser 12 corresponding to the light combining lens group 131, and the first reflecting lens 1311 reflects the first color light beam emitted from the first light emitting area 121. The second reflecting lens 1312 is located on the light emitting side of the second light emitting area 122 and the first reflecting lens 1311 of the laser 12 corresponding to the light combining lens group 131, and the second reflecting lens 1312 reflects the second color light beam emitted from the second light emitting area The third reflector 1313 is located on the light-emitting side of the third light-emitting area 123 of the laser 12, the first reflector 1311, and the second reflector 1312. The third reflector 1313 reflects the third light beam emitted from the third light-emitting area 123 and transmits the first light beam reflected by the first reflector 1311 and the second light beam reflected by the second reflector 1312. The optical axes of the first light beam reflected by the first reflector 1311, the second light beam reflected by the second reflector 1312, and the third light beam reflected by the third reflector 1313 are collinear. In this way, the light-combining lens group 131 can combine the multiple colors of light emitted by the laser 12, and the light-emitting direction of the light-combining lens group 131 is toward the light outlet, so that the combined light can be emitted toward the light outlet 112.

[0071] In a second aspect, some embodiments of the present invention provide a laser projection device, such as Figure 10 As shown, it includes a laser projection light source 1, an optical machine 2 and a projection lens 3 connected in sequence. The laser projection light source 1 is the laser projection light source 1 described in any embodiment of the first aspect above. The optical machine 2 is used to modulate the illumination light beam emitted by the laser projection light source 1 to generate an image light beam, and project the image light beam to the projection lens 3. The projection lens 3 is used to image the image light beam.

[0072] The present invention provides a laser projection device. Since the laser projection device includes the laser projection light source 1 described in any embodiment of the first aspect above, the laser projection device provided by the present invention and the laser projection light source 1 described in the above embodiment can solve the same technical problems and achieve the same expected effects.

[0073] In some embodiments, the laser projection device further includes a projection screen, which is disposed on the light exit path of the projection lens 3 , and the projection light beam formed by the projection lens 3 forms a projection image on the projection screen.

[0074] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0075] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A laser projection light source, characterized in that: include: A housing, the housing comprising a first side wall and a second side wall perpendicular to each other, the first side wall being provided with a plurality of accommodating openings arranged in a row in a direction perpendicular to the second side wall, and the second side wall being provided with a light outlet; a plurality of lasers, each of the plurality of lasers being mounted at the plurality of accommodating openings, and each of the plurality of lasers emitting light toward the housing; wherein a light emitting surface of at least one of the lasers comprises a first light emitting area, a second light emitting area, and a third light emitting area, for emitting a first color light beam, a second color light beam, and a third color light beam, respectively; a polarization direction of a first color light beam emitted from the first light emitting area of ​​at least one of the lasers is the same as a polarization direction of a second color light beam emitted from the second light emitting area of ​​the laser, and a polarization direction of the second color light beam emitted from the second light emitting area is perpendicular to a polarization direction of the third color light beam emitted from the third light emitting area; A plurality of light-combining lens groups are disposed in the housing, the plurality of light-combining lens groups corresponding one to one with the plurality of lasers, and each light-combining lens group is used to combine the multiple colors of light emitted by a corresponding laser; At least one of the light-combining lens groups includes a first reflecting lens, a second reflecting lens and a third reflecting lens, which are respectively arranged corresponding to the first light-emitting area, the second light-emitting area and the third light-emitting area, and are respectively used to emit the light beams emitted from multiple light-emitting areas toward the light outlet, and a first wave plate is arranged between the third light-emitting area of ​​at least one laser and the corresponding third reflecting mirror.

2. The laser projection light source according to claim 1, characterized in that: The first color light beam emitted by the first light emitting area is one of a blue light beam and a green light beam, the second color light beam emitted by the second light emitting area is the other of the blue light beam and the green light beam, and the third color light beam emitted by the third light emitting area is a red light beam; or, The first color light beam emitted from the first light emitting area is a cyan light beam, the second color light beam emitted from the second light emitting area is a yellow light beam, and the third color light beam emitted from the third light emitting area is a magenta light beam.

3. The laser projection light source according to claim 1 or 2, characterized in that: Each light emitting area of ​​at least one laser corresponds to at least one lamp bead; or, Each of the light emitting areas corresponds to at least one row of lamp beads.

4. The laser projection light source according to claim 1, wherein: The third reflective lens is a dichroic lens and is located on the light-emitting side of the first reflective lens and the second reflective lens.

5. The laser projection light source according to claim 4, characterized in that: The first wave plate is used to change the polarization direction of the light beam emitted from the third light exit area, so that the polarization direction of the light beam emitted from the third light exit area is consistent with the polarization direction of the light beam emitted from the first light exit area or the second light exit area.

6. The laser projection light source according to claim 4, characterized in that: The included angles between the reflective surface of the first reflective lens, the reflective surface of the second reflective lens, the reflective surface of the third reflective lens and the light emitting surface of the laser corresponding to the light combining lens group are all 45°±2°.

7. The laser projection light source according to claim 4, characterized in that: The distance between the first reflective lens and the first light exit area on the central axis of the first light exit area is a first distance h1, the distance between the second reflective lens and the second light exit area on the central axis of the second light exit area is a second distance h2, and the distance between the third reflective lens and the third light exit area on the central axis of the third light exit area is a third distance h3. The first distance h1, the second distance h2 and the third distance h3 are all 1~6 mm.

8. The laser projection light source according to claim 1, characterized in that: The arrangement direction of the first light emitting area, the second light emitting area, and the third light emitting area is parallel to the light emitting surface of the laser.

9. The laser projection light source according to claim 1, characterized in that: A light uniforming member is further provided at the light outlet, and the light uniforming member is a diffuser or a fisheye lens.

10. The laser projection light source according to claim 1, wherein: The transmission path of the third color light beam emitted from the third light exit area between the light exit surface of the laser and the light exit port is shorter than the transmission path of the first color light beam emitted from the first light exit area between the light exit surface of the laser and the light exit port, or shorter than the transmission path of the second color light beam emitted from the second light exit area between the light exit surface of the laser and the light exit port.

11. A laser projection device, characterized in that: It includes a laser projection light source, an optical machine and a projection lens connected in sequence, the laser projection light source is the laser projection light source according to any one of claims 1 to 9, the optical machine is configured to modulate the illumination light beam emitted by the laser projection light source to generate an image light beam, and project the image light beam to the projection lens, and the projection lens is configured to image the image light beam.

Images