CN112711164B - Laser projection light source and laser projection equipment - Google Patents
Laser projection light source and laser projection equipment Download PDFInfo
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- CN112711164B CN112711164B CN201911024312.5A CN201911024312A CN112711164B CN 112711164 B CN112711164 B CN 112711164B CN 201911024312 A CN201911024312 A CN 201911024312A CN 112711164 B CN112711164 B CN 112711164B
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- 239000003086 colorant Substances 0.000 claims abstract description 18
- 230000010287 polarization Effects 0.000 claims description 29
- 230000003287 optical effect Effects 0.000 claims description 26
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000005286 illumination Methods 0.000 claims description 5
- 238000000605 extraction Methods 0.000 claims 2
- 239000011324 bead Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000003631 expected effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/145—Housing details, e.g. position adjustments thereof
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/14—Beam splitting or combining systems operating by reflection only
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/14—Beam splitting or combining systems operating by reflection only
- G02B27/141—Beam splitting or combining systems operating by reflection only using dichroic mirrors
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2066—Reflectors in illumination beam
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2073—Polarisers in the lamp house
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/208—Homogenising, shaping of the illumination light
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Projection Apparatus (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
The invention discloses a laser projection light source and laser projection equipment, and relates to the technical field of laser projection equipment. The device is used for solving the problems of reducing the volume and the structural complexity of the laser projection light source while improving the brightness of the light beam emitted by the laser projection light source. The laser projection light source of the present invention includes: the laser comprises a shell, two lasers and a light path component, wherein the shell comprises a first side wall and a second side wall, two accommodating openings are formed in the first side wall, and a light outlet is formed in the second side wall; the two lasers are respectively arranged at the two accommodating openings, and the light emitting surface of each laser comprises a plurality of light emitting areas which are used for emitting light with various colors; the light path component is arranged in the shell and comprises two light combining lens groups and two reflecting pieces, and the light emitting directions of the two light combining lens groups are opposite. The laser projection light source is used for laser projection equipment.
Description
Technical Field
The present invention relates to the field of laser projection devices, and in particular, to a laser projection light source and a laser projection device.
Background
The laser projection light source is an important component of laser projection equipment such as a laser television, a laser projector and the like and is used for providing illumination light beams. In order to improve the brightness of the light beam emitted by the laser projection light source, a plurality of lasers can be arranged in the laser projection light source, and the brightness of the light beam emitted by the laser projection light source can be improved by multiple times by combining the light beams emitted by the lasers into one beam. However, since the laser is usually a monochromatic laser (such as a blue laser, a red laser or a green laser), and the beam emitted by the laser projection light source is a white light beam, multiple fluorescent wheels are required to be arranged in the laser projection light source to be in one-to-one correspondence with the multiple lasers, each fluorescent wheel generates another two colors of laser under the excitation effect of the monochromatic laser emitted by the corresponding laser of the fluorescent wheel, the other two colors of laser and the monochromatic laser emitted by the laser can be mixed to form white light, multiple groups of lenses are required to be arranged in the laser projection light source to be in one-to-one correspondence with the multiple fluorescent wheels for changing the transmission paths of the laser of the other two colors, so that the laser of the other two colors and the monochromatic laser emitted by the laser are mixed to form white light, and multiple beams of white light are synthesized after the laser is mixed to form white light, so as to improve the brightness of the beam emitted by the laser projection light source. Therefore, the laser projection light source comprises more parts, and the structural complexity and the volume of the laser projection light source are increased.
Disclosure of Invention
The invention provides a laser projection light source and laser projection equipment, which are used for solving the problems of reducing the volume and the structural complexity of the laser projection light source while improving the brightness of a light beam emitted by the laser projection light source.
In order to achieve the above purpose, the invention adopts the following technical scheme:
In a first aspect, an embodiment of the present invention provides a laser projection light source, including: the laser comprises a shell, two lasers and a light path component, wherein the shell comprises a first side wall and a second side wall, the first side wall is perpendicular to the second side wall, two accommodating openings are formed in the first side wall, and a light outlet is formed in the second side wall; the two lasers are respectively arranged at the two accommodating openings, each laser emits light towards the inside of the shell, and the light emitting surface of each laser comprises a plurality of light emitting areas which are used for emitting light with various colors; the light path component is arranged in the shell and comprises two light combining lens groups and two reflecting pieces, the two light combining lens groups are respectively used for combining light with multiple colors emitted by the two lasers, the light emitting directions of the two light combining lens groups are opposite, and the two reflecting pieces are respectively used for changing the transmission paths of the emergent light beams of the two light combining lens groups so that the emergent light beams of the two light combining lens groups are emitted towards the light emitting opening.
In some embodiments, the light exit surface of each laser includes a first light exit region, a second light exit region, and a third light exit region; the first light emitting area is used for emitting a first color light beam; the second light emitting area is used for emitting a second color light beam; the third light emitting area is used for emitting 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.
In some embodiments, the first light emitting region, the second light emitting region and the third light emitting region of each laser are sequentially arranged, and the arrangement directions of the first light emitting region, the second light emitting region and the third light emitting region of the two lasers are opposite; each light combining lens group comprises a first reflecting lens, a second reflecting lens and a third reflecting lens, wherein the first reflecting lens is positioned at the light emitting side of a first light emitting area of a laser corresponding to the light combining lens group, the first reflecting lens reflects a first color light beam emitted by the first light emitting area, the second reflecting lens is positioned at the second light emitting area of the laser corresponding to the light combining lens group and the light emitting side of the first reflecting lens, the second reflecting lens reflects a second color light beam emitted by the second light emitting area and transmits the first color light beam reflected by the first reflecting lens, the third reflecting lens is positioned at the third light emitting area of the laser corresponding to the light combining lens group, the first reflecting lens and the light emitting side of the second reflecting lens, and the third reflecting lens reflects a third color light beam emitted by the third light emitting area and transmits the first color light beam reflected by the first reflecting lens and the second color light beam reflected by the second reflecting lens; the optical axis of the first color light beam reflected by the first reflecting mirror, the optical axis of the second color light beam reflected by the second reflecting mirror, and the optical axis of the third color light beam reflected by the third reflecting mirror are collinear.
In some embodiments, the distance between the first reflective lens and the first light exit region on the central axis of the first light exit region is a first distance; the distance between the second reflecting mirror plate and the second light-emitting area on the central axis of the second light-emitting area is a second distance; the distance between the third reflecting lens and the third light-emitting area on the central axis of the third light-emitting area is a third distance; the first distance, the second distance and the third distance are all 1-6 mm.
In some embodiments, the first color light beam emitted from the first light emitting region is one of a blue light beam and a green light beam, the second color light beam emitted from the second light emitting region is the other of the blue light beam and the green light beam, and the third color light beam emitted from the third light emitting region is a red light beam.
In some embodiments, the polarization direction of the first color light beam exiting the first light exit region is the same as the polarization direction of the second color light beam exiting the second light exit region, and the polarization direction of the second color light beam exiting the second light exit region is perpendicular to the polarization direction of the third color light beam exiting the third light exit region; a first wave plate is arranged between the third light emergent region and the third reflecting mirror, and the first wave plate is used for rotating the polarization direction of the third color light beam emergent from the third light emergent region by 90 degrees+/-10 degrees.
In other embodiments, the polarization direction of the first color light beam emitted from the first light emitting region is the same as the polarization direction of the second color light beam emitted from the second light emitting region, and the polarization direction of the second color light beam emitted from the second light emitting region is perpendicular to the polarization direction of the third color light beam emitted from the third light emitting region; a second wave plate is arranged between the first light emergent region and the first reflecting mirror plate, a third wave plate is arranged between the second light emergent region and the second reflecting mirror plate, the second wave plate is used for rotating the polarization direction of the first color light beam emergent from the first light emergent region by 90 degrees+/-10 degrees, and the third wave plate is used for rotating the polarization direction of the second color light beam emergent from the second light emergent region by 90 degrees+/-10 degrees.
In some embodiments, the second wave plate is integrally formed with the third wave plate.
In some embodiments, a spherical lens is mounted within the light exit, the spherical lens being capable of converging the light beam entering the light exit.
In some embodiments, the light incident side of the light outlet is provided with a light homogenizing member.
According to the laser projection light source provided by the invention, the two light combining lens groups are used for respectively combining the light with multiple colors emitted by the two lasers, and the transmission paths of the emitted light beams of the two light combining lens groups are changed through the two reflecting pieces, so that the two combined light beams are emitted towards the light emitting opening, and the superposition of the two light beams is realized, so that the laser projection light source has higher brightness. Meanwhile, the light emergent surface of the laser in the laser projection light source comprises a plurality of light emergent areas which are used for emergent light with various colors, so that a plurality of lenses are not required to be arranged in the laser projection light source provided by the invention, and the size and the structural complexity of the laser projection light source can be reduced. In addition, in the laser projection light source provided by the invention, the two accommodating openings are arranged on the first side wall, and the two lasers are respectively arranged at the two accommodating openings, so that the circuit boards of the two lasers can be arranged to be coplanar, and therefore, one radiator can be adopted to cool the two lasers simultaneously, thereby reducing the cost and the volume of the laser projection light source comprising the radiator and the circuit board.
In a second aspect, an embodiment of the present invention provides a laser projection device, including a laser projection light source, an optical engine, and a projection lens that are sequentially connected, where the laser projection light source is a laser projection light source according to any one of the above-mentioned technical solutions, and the optical engine is configured to modulate an illumination beam emitted by the laser projection light source to generate an image beam, and project the image beam to the projection lens, where the projection lens is configured to image the image beam.
The laser projection device provided by the invention comprises the laser projection light source according to any one of the technical schemes, so that the laser projection device provided by the invention and the laser projection light source according to the technical schemes can solve the same technical problems and achieve the same expected effect.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a perspective view of a laser projection light source according to an embodiment of the present invention;
Fig. 2 is a schematic diagram of an internal structure of a laser projection light source according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of one of the optical path components of the laser projection light source according to the embodiment of the present invention;
FIG. 4 is a second optical path diagram of an optical path component in a laser projection light source according to an embodiment of the present invention;
Fig. 5 is a schematic structural diagram of a laser in a laser projection light source according to an embodiment of the present invention;
Fig. 6 is a schematic structural diagram of a laser, a light combining lens set and a first wave plate in a laser projection light source according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a laser, a light combining lens set, a second wave plate and a third wave plate in a laser projection light source according to an embodiment of the present invention;
Fig. 8 is a schematic structural diagram of a laser projection apparatus according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The laser projection light source is an important component of the laser projection device and is used to provide an illumination beam.
In a first aspect, an embodiment of the present invention provides a laser projection light source 1, as shown in fig. 1 and 2, where the laser projection light source 1 includes: the laser device comprises a shell 11, two lasers 12 and an optical path component 13, wherein, as shown in fig. 2, the shell 11 comprises a first side wall 200 and a second side wall 300, the first side wall 200 is vertical to the second side wall 300, two accommodating openings 111 are arranged on the first side wall 200, and a light outlet (not shown in the figure) is arranged on the second side wall 300; the two lasers 12 are respectively installed at the two accommodating openings 111, and each laser 12 emits light towards the inside of the shell 11, as shown in fig. 5, the light emitting surface of each laser 12 comprises a plurality of light emitting areas for emitting light with various colors; as shown in fig. 2, the optical path component 13 is disposed in the housing 11, the optical path component 13 includes two light combining lens groups 131 and two reflecting members 132, the two light combining lens groups 131 are respectively used for combining the light beams of the multiple colors emitted by the two lasers 12, the light emitting directions (i.e., the directions X and Y in fig. 3) of the two light combining lens groups 131 are opposite, and the two reflecting members 132 are respectively used for changing the transmission paths of the light beams emitted by the two light combining lens groups 131 so as to make the light beams emitted by the two light combining lens groups 131 emit toward the light emitting opening.
It should be noted that the light emitting directions of the two light combining lens groups 131 are opposite, that is, the light emitting directions of the two light combining lens groups 131 are opposite, and the light emitting directions of the two light combining lens groups 131 are opposite. The two light combining lens groups 131 may emit light to the same position in the region between the two light combining lens groups 131, or may emit light to different positions in the region between the two light combining lens groups 131, which is not particularly limited herein. In some embodiments, as shown in fig. 3, the two light combining lens groups 131 may emit light to different positions in the region between the two light combining lens groups 131.
In the laser projection light source provided by the invention, as shown in fig. 2, light with multiple colors emitted by two lasers 12 is respectively combined by two light combining lens groups 131, and the transmission paths of the emitted light beams of the two light combining lens groups 131 are changed by two reflecting pieces 132, so that the two combined light beams are emitted towards the light emitting opening, and the superposition of the two light beams is realized, thereby enabling the laser projection light source to have higher brightness. Meanwhile, as shown in fig. 5, since the light emitting surfaces of the lasers in the laser projection light source 1 all comprise a plurality of light emitting areas, the light emitting areas are used for emitting light with a plurality of colors, a plurality of lenses are not required to be arranged in the laser projection light source 1 provided by the invention, and therefore, the volume and the structural complexity of the laser projection light source 1 can be reduced. Furthermore, in the laser projection light source 1 provided by the present invention, as shown in fig. 2, two accommodating openings 111 are provided on the first side wall 200, and two lasers 12 are respectively mounted at the two accommodating openings 111, so that the circuit boards 15 (shown in fig. 1) of the two lasers 12 can be arranged coplanar, and therefore, one heat sink 16 can be used to cool the two lasers 12 (shown in fig. 1) at the same time, so that the cost and volume of the laser projection light source 1 including the heat sink 16 and the circuit boards 15 can be reduced.
In some embodiments, as shown in fig. 2, a spherical lens 14 is mounted in the light outlet, and the spherical lens 14 is capable of converging the light beam entering the light outlet. In this way, the optical elements (such as the light guide 100 in fig. 3) in the subsequent light engine of the laser projection light source 1 can be designed smaller in size, which is advantageous for reducing the size of the laser projection device.
The light emitting surface of the laser 12 may include two light emitting regions, three light emitting regions, or four light emitting regions, and the like, which are not particularly 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 from the light emitting surface of the laser 12, and each light emitting area is used for emitting light of one color.
In some embodiments, as shown in fig. 5, the light-emitting surface of each laser 12 includes a first light-emitting region 121, a second light-emitting region 122, and a third light-emitting region 123; the first light emitting region 121 is configured to emit a first color light beam; the second light emitting region 122 is configured to emit a second color light beam; the third light emitting region 123 is configured 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. This simple structure need not to set up the fluorescent wheel in the laser projection light source 1, consequently can further reduce the volume of laser projection light source 1.
In the above-described embodiments, the colors of the first color light beam, the second color light beam, and the third color light beam are not particularly 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. As shown in fig. 5, the first color light beam emitted from the first light emitting region 121 is a blue light beam, the second color light beam emitted from the second light emitting region 122 is a green light beam, and the third color light beam emitted from the third light emitting region 123 is a red light beam. As another example, the first color light beam emitted from the first light emitting region 121 is a cyan light beam, the second color light beam emitted from the second light emitting region 122 is a yellow light beam, and the third color light beam emitted from the third light emitting region 123 is a magenta light beam.
The first light-emitting region 121, the second light-emitting region 122, and the third light-emitting region 123 may correspond to one bead in the laser 12, may correspond to a row of beads in the laser 12, and may also correspond to multiple rows of beads in the laser 12, which is not limited herein. In some embodiments, as shown in fig. 5, the third light-emitting region 123 corresponds to two rows of beads in the laser 12, and the first light-emitting region 121 and the second light-emitting region 122 each correspond to one row of beads in the laser 12. Each row of beads comprises 6 beads.
The reflecting member 132 may be a lens or a prism, and is not particularly limited herein. In some embodiments, as shown in fig. 3 and 4, the reflective member 132 is a lens.
The light combining lens group 131 has various structural forms, and is not particularly limited herein.
In some embodiments, as shown in fig. 5, the first light-emitting region 121, the second light-emitting region 122, and the third light-emitting region 123 of each laser 12 are sequentially arranged, and the arrangement directions of the first light-emitting region 121, the second light-emitting region 122, and the third light-emitting region 123 of the two lasers 12 are opposite; as shown in fig. 3 and 4, 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 region 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 region 121, the second reflecting lens 1312 is located at the second light emitting region 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 region 122 and transmits the first color light beam reflected by the first reflecting lens 1311, the third reflecting lens 1313 is located at the third light emitting region 123 of the laser 12 corresponding to the light combining lens group 131, the first reflecting lens 1311, and the light emitting side of the second reflecting lens 1312, the third reflecting lens 1313 reflects the third color light beam emitted from the third light emitting region 123 and transmits the first color light beam reflected by the first reflecting lens 1312 and the second color light beam reflected by the second reflecting lens 1311; the optical axis of the first color light beam reflected by the first mirror 1311, the optical axis of the second color light beam reflected by the second mirror 1312, and the optical axis of the third color light beam reflected by the third mirror 1313 are collinear. In this way, the first mirror 1311, the second mirror 1312, and the third mirror 1313 can combine the three color light fluxes emitted from the laser 12, and this structure is simple and easy to realize.
In the above-described embodiment, it should be understood that ensuring that the optical axis of the first color light beam reflected by the first mirror 1311, the optical axis of the second color light beam reflected by the second mirror 1312, and the optical axis of the third color light beam reflected by the third mirror 1313 are absolutely collinear is difficult to achieve during actual processing and installation of the laser projection light source 1, and therefore, it should be understood that the optical axes of the first color light beam reflected by the first mirror 1311, the second color light beam reflected by the second mirror 1312, and the third color light beam reflected by the third mirror 1313 described in the embodiments of the present application are not to be interpreted as being absolutely collinear, but rather as being "collinear or approximately collinear". By way of example, the optical axes of the first color light beam reflected by the first reflecting mirror 1311, the second color light beam reflected by the second reflecting mirror 1312, and the third color light beam reflected by the third reflecting mirror 1313 described in the embodiment of the present application are collinear, which means that, among the optical axes of the first color light beam reflected by the first reflecting mirror 1311, the second color light beam reflected by the second reflecting mirror 1312, and the third color light beam reflected by the third reflecting mirror 1313, the interval between any two optical axes is smaller than a first specific value, the angle between any two optical axes is smaller than a second specific value, which may be 1mm, 2mm, or 3mm, etc., without being specifically limited thereto, and the second specific value may be 1 °,2 °, or 3 °, etc., without being specifically limited thereto.
The first reflecting mirror 1311 may be a total reflecting mirror, a dichroic plate, or other structures, which are not particularly limited herein. As illustrated in fig. 3 and 4, the first mirror 1311 is a total reflection mirror.
The second reflection mirror 1312 and the third reflection mirror 1313 may be dichroic plates, or may have other structures, and are not particularly limited herein. In some embodiments, as shown in fig. 3 and 4, the second mirror plate 1312 and the third mirror plate 1313 are dichroic plates.
In some embodiments, as shown in fig. 6, a distance between the first reflecting mirror 1311 and the first light emitting region 121 on the central axis l 1 of the first light emitting region 121 is a first distance h 1, a distance between the second reflecting mirror 1312 and the second light emitting region 122 on the central axis l 2 of the second light emitting region 122 is a second distance h 2, a distance between the third reflecting mirror 1313 and the third light emitting region 123 on the central axis l 3 of the third light emitting region 123 is a third distance h 3, and the first distance h 1, the second distance h 2, and the third distance h 3 are all 1-6 mm. In this way, the distance between the light combining lens group 131 and the laser 12 is moderate, so that the size of the laser projection light source 1 in the direction perpendicular to the light emitting surface of the laser 12 can be reduced, and collision damage of the light combining lens group 131 and the laser 12 during installation due to the fact that the distance between the light combining lens group 131 and the laser 12 is relatively close can be avoided.
In the above embodiment, as shown in fig. 6, the central axis l 1 of the first light-emitting region 121 is an axis perpendicular to the light-emitting surface of the laser 12 and passing through the center of the first light-emitting region 121; the central axis l 2 of the second light-emitting region 122 is an axis perpendicular to the light-emitting surface of the laser 12 and passing through the center of the second light-emitting region 122; the central axis l 3 of the third light-emitting region 123 is an axis perpendicular to the light-emitting surface of the laser 12 and passing through the center of the third light-emitting region 123.
The light emitted from the light emitting surface of the laser 12 is emitted by a light emitting device (i.e., a lamp bead) inside the laser 12, and compared with the light emitting device emitting laser light of other colors, the divergence angle of the light beam emitted by the light emitting device emitting red light is larger, so as to avoid the light spot of the light beam emitted by the laser 12 being larger when the light beam is reflected by the light combining lens group 131 and the reflecting member 132 and transmitted to the light emitting port, in some embodiments, as shown in fig. 5, the first color light beam emitted by the first light emitting region 121 is one of the blue light beam and the green light beam, the second color light beam emitted by the second light emitting region 122 is the other one of the blue light beam and the green light beam, and the third color light beam emitted by the third light emitting region 123 is the red light beam. In this way, compared with the first color light beam emitted from the first light emitting region 121 and the second color light beam emitted from the second light emitting region 122, the transmission path of the third color light beam (i.e., the red light beam) emitted from the third light emitting region 123 between the light emitting surface of the laser 12 and the light emitting opening is shorter, and the light spot formed at the light emitting opening is smaller, so that the light spot of the light beam emitted from the laser 12 after being reflected by the light combining lens group 131 and the reflecting member 132 and transmitted to the light emitting opening is not too large, which is beneficial to reducing the diameter of the spherical lens installed in the light emitting opening.
In some embodiments, as shown in fig. 5, the polarization direction of the first color light beam emitted from the first light emitting region 121 is the same as the polarization direction of the second color light beam emitted from the second light emitting region 122, and the polarization direction of the second color light beam emitted from the second light emitting region 122 is perpendicular to the polarization direction of the third color light beam emitted from the third light emitting region 123.
In the above embodiment, in order to increase the light output uniformity of the laser projection light source 1, the following two alternative implementations may be adopted:
In a first alternative implementation, as shown in fig. 6, a first wave plate 135 is disposed between the third light emitting region 123 and the third reflection lens 1313, and the first wave plate 135 is configured to rotate the polarization direction of the third color light beam emitted from the third light emitting region 123 by 90+±10°. In this way, the polarization direction of the light beam emitted from the third light emitting region 123 is changed by the first wave plate 135, so that the polarization direction of the light beam emitted from the third light emitting region 123 is consistent with the polarization direction of the light beam emitted from the first light emitting region 121 or the second light emitting region 122, and the light emitting uniformity of the laser projection light source 1 can be increased.
In a second alternative implementation manner, as shown in fig. 7, a second wave plate is disposed between the first light-emitting region 121 and the first reflecting mirror 1311, a third wave plate is disposed between the second light-emitting region 122 and the second reflecting mirror 1312, the second wave plate is used for rotating the polarization direction of the second color light beam emitted from the first light-emitting region 121 by 90 ° ± 10 °, and the third wave plate is used for rotating the polarization direction of the third color light beam emitted from the second light-emitting region 122 by 90 ° ± 10 °. In this way, the polarization directions of the light beams emitted from the first light emitting region 121 and the second light emitting region 122 are 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 emitting region 121 and the second light emitting region 122 are consistent with the polarization directions of the light beams emitted from the third light emitting region 123, and the light emitting uniformity of the laser projection light source 1 can be increased.
In the above embodiment, optionally, as shown in fig. 7, the second wave plate is integrally formed with the third wave plate to form the structure 136. Thus, the laser projection light source 1 includes a smaller number of parts, and has lower structural complexity and assembly difficulty.
In order to improve uniformity of the outgoing light beams of the two light combining lens groups 131 when combining one light beam, in some embodiments, as shown in fig. 3 and 4, a light homogenizing member 133 is disposed on the light incident side of the light outlet. The light equalizing member 133 can improve uniformity of the outgoing light beams of the two light converging lens groups 131 when one light beam is combined.
In some embodiments, light homogenizing member 133 is a diffuser or a fisheye lens.
In a second aspect, some embodiments of the present invention provide a laser projection device, as shown in fig. 8, including a laser projection light source 1, a light engine 2, and a projection lens 3 sequentially connected, where the laser projection light source 1 is the laser projection light source 1 according to any one of the first aspect, the light engine 2 is configured to modulate an illumination beam emitted by the laser projection light source 1 to generate an image beam, and project the image beam to the projection lens 3, and the projection lens 3 is configured to image the image beam.
The laser projection device provided by the invention comprises the laser projection light source 1 according to any one of the embodiments of the first aspect, so that the laser projection device provided by the invention and the laser projection light source 1 according to the embodiments of the invention can solve the same technical problems and achieve the same expected effects.
In some embodiments, the laser projection device further includes a projection screen, the projection screen is disposed on the light-emitting path of the projection lens 3, and the projection beam imaged by the projection lens 3 forms a projection screen on the projection screen.
In the description of the present specification, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A laser projection light source, comprising:
The light emitting device comprises a shell, wherein the shell comprises a first side wall and a second side wall, the first side wall is perpendicular to the second side wall, two accommodating openings are formed in the first side wall, and a light emitting opening is formed in the second side wall;
The two lasers are respectively arranged at the two accommodating openings, each laser emits light towards the inside of the shell, the light emitting surface of each laser comprises a plurality of light emitting areas, the light emitting areas are used for emitting light with various colors, and the light incident side of the light emitting opening is provided with a light homogenizing piece;
The light path component is arranged in the shell and comprises two light combining lens groups and two reflecting pieces, the two light combining lens groups are respectively used for combining light with multiple colors emitted by the two lasers, the light emitting directions of the two light combining lens groups are opposite, and the two reflecting pieces are respectively used for changing the transmission paths of the emitted light beams of the two light combining lens groups so as to enable the emitted light beams of the two light combining lens groups to be emitted towards the light emitting opening; the light-emitting surface of each laser comprises a first light-emitting area, a second light-emitting area and a third light-emitting area; the first light emergent area is used for emergent light beams of a first color; the second light emitting area is used for emitting a second color light beam; the third light emitting area is used for emitting 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;
The first light emitting area, the second light emitting area and the third light emitting area of each laser are sequentially arranged, and the arrangement directions of the first light emitting area, the second light emitting area and the third light emitting area of the two lasers are opposite; each light combining lens group comprises a first reflecting lens, a second reflecting lens and a third reflecting lens, wherein the first reflecting lens is positioned at the light emitting side of a first light emitting area of a laser corresponding to the light combining lens group, the first reflecting lens reflects a first color light beam emitted from the first light emitting area, the second reflecting lens is positioned at a second light emitting area of the laser corresponding to the light combining lens group, the second reflecting lens reflects a second color light beam emitted from the second light emitting area, and the third reflecting lens is positioned at the light emitting side of a third light emitting area of the laser corresponding to the light combining lens group, the first reflecting lens and the second reflecting lens, and the third reflecting lens reflects a third color light beam emitted from the third light emitting area and transmits the first color light beam reflected by the first reflecting lens and the second color light beam reflected by the second reflecting lens;
the optical axis of the first color light beam reflected by the first reflecting mirror plate, the optical axis of the second color light beam reflected by the second reflecting mirror plate and the optical axis of the third color light beam reflected by the third reflecting mirror plate are collinear;
a first wave plate is arranged between the third light emergent region and the third reflecting lens of the laser, and the first wave plate is used for rotating the polarization direction of the third color light beam emergent from the third light emergent region by 90 degrees+/-10 degrees.
2. The laser projection light source as claimed in claim 1, wherein the second reflecting mirror is located at a second light emitting region of the laser corresponding to the light combining lens group and at a light emitting side of the first reflecting mirror, and the second reflecting mirror reflects the second color light beam emitted from the second light emitting region and transmits the first color light beam reflected by the first reflecting mirror.
3. The laser projection light source of claim 2, wherein a distance between the first reflective mirror and the first light extraction region on a central axis of the first light extraction region is a first distance;
The distance between the second reflecting mirror plate and the second light emergent region on the central axis of the second light emergent region is a second distance;
The distance between the third reflecting lens and the third light emergent region on the central axis of the third light emergent region is a third distance;
the first distance, the second distance and the third distance are all 1-6 mm.
4. A laser projection light source as claimed in claim 2 or 3, wherein the first color light beam emitted from the first light emitting region is one of a blue light beam and a green light beam, the second color light beam emitted from the second light emitting region is the other of the blue light beam and the green light beam, and the third color light beam emitted from the third light emitting region is a red light beam.
5. A laser projection light source as claimed in claim 2 or 3, wherein the polarization direction of the first color light beam exiting the first light exit region is the same as the polarization direction of the second color light beam exiting the second light exit region, and the polarization direction of the second color light beam exiting the second light exit region is perpendicular to the polarization direction of the third color light beam exiting the third light exit region.
6. A laser projection device, comprising a laser projection light source, a light engine and a projection lens connected in sequence, wherein the laser projection light source is the laser projection light source according to any one of claims 1 to 5, the light engine is configured to modulate an illumination beam emitted by the laser projection light source to generate an image beam, and project the image beam to the projection lens, and the projection lens is configured to image the image beam.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911024312.5A CN112711164B (en) | 2019-10-25 | 2019-10-25 | Laser projection light source and laser projection equipment |
| PCT/CN2020/121935 WO2021078102A1 (en) | 2019-10-25 | 2020-10-19 | Laser projection light source and laser projection device |
| US17/481,800 US20220004090A1 (en) | 2019-10-25 | 2021-09-22 | Laser source and laser projection apparatus |
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| CN201911024312.5A CN112711164B (en) | 2019-10-25 | 2019-10-25 | Laser projection light source and laser projection equipment |
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| CN112711164B true CN112711164B (en) | 2024-10-18 |
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| CN210954575U (en) * | 2019-10-25 | 2020-07-07 | 青岛海信激光显示股份有限公司 | Laser projection light source and laser projection equipment |
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| US8087785B2 (en) * | 2008-02-25 | 2012-01-03 | Young Optics Inc. | Projection display apparatus |
| CN102566235B (en) * | 2012-02-06 | 2014-10-29 | 海信集团有限公司 | Light source apparatus, light source generation method and laser projector containing light source apparatus |
| JP5928383B2 (en) * | 2013-03-22 | 2016-06-01 | ソニー株式会社 | Light source device and display device |
| CN104808425A (en) * | 2014-01-26 | 2015-07-29 | 中能激光显示技术（上海）有限公司 | Laser light source light beam parameter consistency adjusting device and adjusting method thereof |
| JP2017003793A (en) * | 2015-06-11 | 2017-01-05 | セイコーエプソン株式会社 | Light source device and projector |
| US20180180251A1 (en) * | 2016-12-27 | 2018-06-28 | Hisense Co., Ltd. | Laser projection device and laser source thereof |
| CN106873298A (en) * | 2017-04-11 | 2017-06-20 | 中视迪威激光显示技术有限公司 | Laser source system for laser display and the projector equipment using the system |
| CN207689821U (en) * | 2017-11-11 | 2018-08-03 | 深圳市中科创激光技术有限公司 | A kind of laser display light source |
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| CN210954575U (en) * | 2019-10-25 | 2020-07-07 | 青岛海信激光显示股份有限公司 | Laser projection light source and laser projection equipment |
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