CN115755509A - Laser light source and laser projector - Google Patents

Laser light source and laser projector Download PDF

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Publication number
CN115755509A
CN115755509A CN202211595861.XA CN202211595861A CN115755509A CN 115755509 A CN115755509 A CN 115755509A CN 202211595861 A CN202211595861 A CN 202211595861A CN 115755509 A CN115755509 A CN 115755509A
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CN
China
Prior art keywords
light
laser
light emitting
area
mirror
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Pending
Application number
CN202211595861.XA
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Chinese (zh)
Inventor
田新团
赵云
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Qingdao Hisense Laser Display Co Ltd
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Qingdao Hisense Laser Display Co Ltd
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Priority to CN202211595861.XA priority Critical patent/CN115755509A/en
Publication of CN115755509A publication Critical patent/CN115755509A/en
Pending legal-status Critical Current

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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
    • G03B21/2006—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
    • G03B21/206—Control of light source other than position or intensity
    • 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
    • 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

Abstract

The invention provides a laser light source and a laser projection apparatus. The invention provides a laser light source and a laser projection device, which comprise a laser and a circuit board, wherein the laser is connected with the circuit board, and the circuit board is used for conducting the laser to enable the laser to emit light beams; the light emitting area of the laser comprises a green light emitting area, a blue light emitting area and a red light emitting area, wherein the light emitting area of the red light emitting area is larger than the light emitting areas of the blue light emitting area and the green light emitting area; the laser device further comprises a light combining mirror assembly, wherein the light combining mirror assembly is used for combining light beams emitted by the laser device, and the light combining mirror assembly comprises a plurality of lenses which are not overlapped with each other in a direction vertical to a light emitting surface of the laser device; the plurality of lenses respectively correspond to the three light-emitting areas, wherein the area of the lens corresponding to the red light-emitting area for receiving the red light beams is larger than the area of the lens corresponding to the other two light-emitting areas for receiving the corresponding color light beams. The laser light source and the laser projection device have simple structures and smaller volumes.

Description

Laser light source and laser projector
The invention is based on Chinese invention application 201910125848.X (2019-02-20), and the invention name is as follows: the patent refers to the field of 'optical elements, systems, or AN _ SNparatus'.
Technical Field
The invention relates to the technical field of laser projection display, in particular to a laser light source and a laser projection device.
Background
With the continuous progress of science and technology, new projection devices such as laser projection devices are increasingly appearing in the work and life of people.
Most of laser light sources of the existing laser projection devices adopt monochromatic laser light sources, and meet the optical performance requirements by combining fluorescent powder wheels and various lenses. Specifically, taking an existing monochromatic laser light source as an example, the light source device at least includes the following components: blue laser, fluorescent wheel, color filter wheel. The blue laser is used for exciting the fluorescent powder wheel, red fluorescence (or yellow fluorescence and orange fluorescence) and green fluorescence are emitted through fluorescence conversion, then the red fluorescence and the green fluorescence with high purity are obtained through filtering and purifying by the filtering color wheel, and the red fluorescence and the green fluorescence with high purity are matched with the blue laser to jointly form a three-primary-color light source. The three primary color mixed light source is shaped and projected on a Digital Micromirror Device (DMD) through a light path of a light machine, the DMD chip reflects the three primary color light into a projection lens, and the light beam is corrected and amplified through the projection lens to form an image on a projection screen.
However, the monochromatic laser light source includes a plurality of color wheels and a shaping and converging light path component for meeting optical index requirements of fluorescence excitation, light bar light collection and the like, so that the structure of the light source system is complex, and the volume is large.
Disclosure of Invention
The invention provides a laser light source and a laser projection device, which are simple in structure and small in size.
In one aspect, the present invention provides a laser light source, comprising a laser and a light-combining mirror assembly; the light emitting surface of the laser is provided with a plurality of light emitting areas, and the colors of light beams emitted by different light emitting areas are different; the light combining mirror assembly comprises a plurality of mirrors, the plurality of mirrors are sequentially arranged on a light transmission path of the laser, different mirrors correspond to different light emitting areas, an included angle is formed between each mirror and the light emitting direction of the corresponding light emitting area and used for reflecting light beams emitted by the corresponding light emitting areas to the light emitting direction of the laser light source, the mirrors are sequentially arranged along the light emitting direction of the laser light source, and at least one mirror can penetrate light beams reflected by other mirrors so that the light beams reflected by the mirrors and the light beams transmitted by the mirrors are emitted along the light emitting direction of the laser light source.
In another aspect, the present invention provides a laser projection apparatus, including the laser light source as described above.
The invention provides a laser light source and a laser projection device, wherein the laser light source comprises a laser and a light-combining mirror assembly; the light emitting surface of the laser is provided with a plurality of light emitting areas, and the colors of light beams emitted by different light emitting areas are different; the light combining mirror assembly comprises a plurality of mirrors, the plurality of mirrors are sequentially arranged on a light transmission path of the laser, different mirrors correspond to different light emitting areas, an included angle is formed between each mirror and the light emitting direction of the corresponding light emitting area and used for reflecting light beams emitted by the corresponding light emitting areas to the light emitting direction of the laser light source, the mirrors are sequentially arranged along the light emitting direction of the laser light source, and at least one mirror can penetrate light beams reflected by other mirrors so that the light beams reflected by the mirrors and the light beams transmitted by the mirrors are emitted along the light emitting direction of the laser light source. The light combining mirror assembly is arranged on the light transmission path of the light beam emitted by the laser, different lenses of the light combining mirror assembly correspond to corresponding light emitting areas of the laser one by one, the lens with an included angle with the light emitting direction of the light emitting areas can reflect the light beam emitted by the light emitting areas to the light emitting direction of the laser source, and at least one lens can penetrate the light beams reflected by other lenses, so that the light beams reflected by all the lenses can be emitted along the light emitting direction of the laser source, and the laser source formed by the laser capable of emitting the light beams with different colors and the light combining mirror assembly with a plurality of lenses corresponding to the light emitting areas is simple in structure and small in size.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a laser light source according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an optical path formed by a laser light source according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a laser according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another laser light source according to a first embodiment of the present invention;
fig. 5 is a schematic structural diagram of a connection between a laser and a circuit board according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a laser projection apparatus according to a second embodiment of the present invention.
Description of the reference numerals:
100-a laser light source; 110-a laser; 111-light emitting area; 1111-green light emitting area; 1112-a blue light-emitting area; 1113-red light emitting area; 112-pins; 120-a light-combining mirror assembly; 121-a lens; 1211 — mirror; 1212-first integrator lens; 1213 — second combiner; 130-a housing; 131-an accommodating cavity; 132-an opening; 140-a lens; 150-light bar; 160-a circuit board; 161-accommodation area; 200-lens; 300-laser projection device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
Fig. 1 is a schematic structural diagram of a laser light source according to an embodiment of the present invention. Fig. 2 is a schematic view of an optical path formed by a laser light source according to an embodiment of the present invention. Fig. 3 is a schematic structural diagram of a laser according to an embodiment of the present invention. Fig. 4 is a schematic structural diagram of another laser light source according to a first embodiment of the present invention. As shown in fig. 1 to 4, the laser light source 100 provided in this embodiment includes a laser 110 and a light combining mirror assembly 120; the light emitting surface of the laser 110 has a plurality of light emitting areas 111, and the light beams emitted by different light emitting areas 111 have different colors; the light combining mirror assembly 120 includes a plurality of mirrors 121, the plurality of mirrors 121 are sequentially disposed on a light transmission path of the laser, different mirrors 121 correspond to different light emitting areas 111, each mirror 121 forms an included angle with a light emitting direction of the corresponding light emitting area 111, and is configured to reflect a light beam emitted from the corresponding light emitting area 111 to the light emitting direction of the laser source 100, the mirrors 121 are sequentially arranged along the light emitting direction of the laser source 100, and at least one mirror 121 can transmit light beams reflected by other mirrors 121, so that the light beam reflected by the mirror 121 and the light beam transmitted through the mirror can be emitted along the light emitting direction of the laser source 100.
The laser light source 100 of the present embodiment is composed of a laser 110 and a light combining mirror assembly 120, wherein a light exit surface of the laser 110 has a plurality of light exit areas 111, the plurality of light exit areas 111 are used for emitting a plurality of light beams with different colors, the light combining mirror assembly 120 is used for receiving the light beams emitted by the laser 110 and reflecting the light beams, and after being reflected by the light combining mirror assembly 120, the plurality of light beams with different colors can be converged into a white light beam. As shown in fig. 2, in the laser projection apparatus 400 including the laser light source 100 of the present embodiment, a lens 140 and a light bar 150 are further sequentially disposed on an optical path formed by the laser light source 100, the white light finally formed by the laser light source 100 is first condensed by the lens 140, the condensed white light is then homogenized by the light bar 150, and then the white light is imaged on a projection screen through a lens.
In a specific implementation, a diffusion sheet is further disposed between the lens 140 and the light bar 150, and the diffusion sheet is a rotating diffusion sheet, which can perform speckle elimination on a pure three-color laser beam output by the light source, improve beam quality, and reduce a speckle effect of a projected image.
Specifically, the light beams with different colors emitted from the light emitting regions 111 of the light emitting surface of the laser 110 may all face the first direction, that is, the emitting directions of the light beams are the same, and the light beams emitted from the laser 110 may all irradiate onto the mirrors 121 of the light combining component 120, wherein the mirrors 121 with different colors may correspond to the light beams with different colors emitted from the light emitting regions 111 of the laser 110, so that the mirrors 121 can reflect the light beams with corresponding colors. After the lenses 121 receive and reflect the light beams of the corresponding colors, the light paths of the reflected light beams are along the second direction, and the light paths between the light beams along the second direction may be overlapped with each other, so that the light beams of different colors that are overlapped with each other may be converged to form white light.
It should be noted that, in the present embodiment, the laser 110 can emit a plurality of light beams with different colors, and the emitting optical paths of all the light beams are in the first direction, so that the laser 110 should have light emitting chips capable of emitting light beams with different colors, that is, the light emitting regions 111 capable of emitting light beams with different colors, and the directions of the light emitting surfaces of the light emitting chips capable of emitting light beams with different colors should be consistent, so that the optical paths of the light beams emitted by all the light emitting chips can be ensured to be in the first direction.
The light emitting chips arranged on the laser 110 may be located in a row, and the light emitting chips are arranged on the same row at intervals in sequence, that is, the light emitting areas 111 on the light emitting surface of the laser 110 are arranged at intervals in sequence, so that the light emitting surfaces of all the light emitting chips face the same direction, and thus, the light beams emitted by all the light emitting chips can be ensured to be transmitted along the first direction, and the emitted light beams cannot be overlapped with each other, so that the emitted light beams are all monochromatic light beams with single color corresponding to the light emitting chips. Thus, the light emitting regions 111 on the light emitting surface of the laser 110 can be arranged on a plane at intervals, thereby ensuring that the laser 110 is a sheet laser with a simpler structure.
In addition, the light emitting chips disposed on the laser 110 may not be in the same row, and the light emitting chips may be disposed up and down and back and forth, but the light emitting surfaces of all the light emitting chips are in the same direction, and the light emitting surfaces of the light emitting chips should not overlap in the light path direction of the emitted light beam, that is, the light emitting chips disposed up and down and back and forth should be spaced apart from each other in the first direction, so as to ensure that the light paths of the light beams of different colors emitted by the light emitting chips do not overlap with each other, and all the light beams are the light beams with a single color in the first direction. In order to make the structure of the laser 110 simpler, and the space occupied by the laser 110 in the laser light source 100 is less, all the light emitting chips may be preferably disposed on the same column, and the structure of packaging all the light emitting chips located on the same column in the laser 110 is relatively simpler, so that the overall thickness of the laser 110 may be reduced.
For each transparent lens 121 in the combiner assembly 120, at least the following conditions should be satisfied:
first, each mirror 121 should be disposed on the light path of the light beam corresponding to the color of the light beam, and the reflection surface of the mirror 121 should face the emitting direction of the light beam, so that when the light beam of the corresponding color is irradiated onto the reflection surface of the mirror 121, the mirror 121 can reflect the light beam.
Secondly, since the light beam emitted from the laser 110 is to be reflected, an angle should be formed between the mirror 121 and the light beam exit path, that is, the first direction, and the reflection surface of the mirror 121 should not be perpendicular to the first direction, so that the mirror 121 can reflect the light beam, and the reflected light path formed by the reflected light beam, that is, the second direction and the first direction are different or opposite to each other, but has an angle, so that all the light beams on the reflected light path can be converged to form white light.
Third, the reflection surface of the lens 121 should be able to cover the spot area of the corresponding color light beam emitted from the laser 110, that is, the emitted light beam should be able to completely irradiate onto the reflection surface of the lens 121, so that the lens 121 can reflect all the light rays emitted from the laser 110, on one hand, the utilization rate of the light rays emitted from the laser 110 by the light combining mirror assembly 120 can be improved, and more importantly, it can be ensured that the laser source 100 does not generate unnecessary light loss, thereby ensuring that the laser source 100 has better performance.
Fourthly, after all the mirrors 121 reflect the corresponding light beams, the formed reflected light paths are along the second direction, and all the light beams in the second direction should be able to converge together to form white light, and all the light beams emitted from the laser 110 are directed toward the first direction, so the inclination angles of all the mirrors 121 with respect to the first direction should be the same to ensure that the reflected light beams of all the light beams after being reflected by all the mirrors 121 are along the second direction; in addition, according to the included angle between the mirror 121 and the first direction, the position of each mirror 121 in the first direction should be reasonably set so that all the light beams reflected to the second direction are overlapped with each other, and the reflected light paths of all the light beams can be converged to form white light.
Fifth, since each mirror 121 is disposed corresponding to a light beam of a corresponding color emitted by the laser 110, and the light path of each light beam emitted by the laser 110 is along the first direction, all the mirrors 121 reflect each corresponding light beam to the second direction, and the light beams in the second direction can converge together to form white light. Therefore, while the mirror 121 reflects the light beam with the same color as itself in the second direction, the mirror 121 should not block the reflected light path of the light beam reflected by the other mirror 121 in the second direction. The structure of the mirror 121 itself can be selected so that the mirror 121 reflects the light beam corresponding to its own color and transmits light beams of other colors, so that all light beams in the second direction can be converged to form white light; or, the distance between the mirrors 121 is designed reasonably to ensure that each mirror 121 is not on the reflection light path of the other mirrors 121 to the light beam, each mirror 121 does not obstruct the reflection light path of the other light beam, and each mirror 121 can overlap the reflection light paths of the reflected corresponding light beams, so that all the light beams converge to form white light.
As described above, the laser light source 100 of the present embodiment is composed of the laser 110 capable of emitting light beams with different colors and the light combining mirror assembly 120 capable of reflecting light beams with different colors, the light paths of the light beams with different colors emitted from the laser 110 are all along the first direction, the light combining mirror assembly 120 includes the mirror 121 with different colors, the mirror 121 corresponds to different light emitting areas 111 on the light emitting surface of the laser 110, the corresponding mirror 121 reflects the light beams emitted from the corresponding light emitting areas 111, the reflected light paths formed by all the light beams reflected by all the mirror 121 are all along the second direction, and the light beams in the second direction are overlapped and converged to form white light. The laser 110 and the light combining mirror assembly 120 of the laser light source 100 of the present embodiment have simple structures, and the volume of the laser light source 100 can be made smaller on the basis of meeting the performance requirement of the laser light source 100.
In order to enable the mirror 121 to reflect the light beams corresponding to its own color, and at the same time, not to affect the reflection light paths of the light beams reflected by the other mirrors 121, that is, to ensure that all the light beams reflected by the mirror 121 can be converged into white light along the second direction, the plurality of mirrors 121 of the embodiment include a reflecting mirror and at least one light combining mirror, and the light combining mirror is configured to reflect the light beams emitted by the corresponding light emitting area 111 and transmit the light beams correspondingly emitted by the other light emitting areas 111; the reflecting mirror is used for reflecting the light beam emitted from the corresponding light emitting area 111.
As shown in fig. 1, the plurality of lenses 121 includes at least one light combiner, which is also called a dichroic mirror, and is characterized in that light with certain wavelengths is almost completely transmitted, and light with other wavelengths is almost completely reflected. The lens 121 of this embodiment adopts a light combining mirror, which can almost completely reflect the light beam corresponding to its own color, so that the light beam of the color emitted from the laser 110 forms a reflected light path along the second direction after being reflected by the light combining mirror; when the light beams reflected by the other lenses 121 need to pass through the light combining mirror in the second direction to be combined with other light beams to form white light, the light combining mirror can transmit light beams of other colors, the reflection light paths of the light beams of other colors are not blocked, and it can be ensured that the light beams of all colors can be combined to form white light in the second direction.
In addition, as shown in fig. 1, the plurality of mirrors 121 include a mirror for reflecting the light beam corresponding to the color of the mirror, and the mirror is located outside the optical path of the light beams of other colors. The mirror 121 may be configured as a reflecting mirror, so that the reflected light path of the light beam reflected by the other mirror 121 in the second direction is not obstructed, and the condition that all the light beams converge to form white light in the second direction is not affected no matter whether the mirror 121 is a light combiner. That is, the mirror 121 serves as a reflector, and only reflects the light beam corresponding to its own color, but does not transmit the light beams of other colors.
It should be noted that, the plurality of lenses 121 may not include a reflector, but all the lenses 121 are light-combining lenses, on one hand, the light-combining lenses satisfy the condition of reflecting the light beams corresponding to the colors of the lenses themselves and transmitting the light beams of other colors, meet the functional requirements of all the lenses 121, and ensure that all the light beams reflected by the light-combining lens assembly 120 are converged into white light in the second direction; on the other hand, when the mirror combination unit 120 is manufactured, the manufacturing processes of the respective lenses 121 are not distinguished, and the probability of errors in the manufacturing processes and the probability of assembly errors can be reduced to some extent.
Further, the light output surface of the laser 110 has three light output regions 111, and the three light output regions 111 are a green light output region 1111 for emitting a green light beam, a blue light output region 1112 for emitting a blue light beam, and a red light output region 1113 for emitting a red light beam, respectively.
As shown in fig. 1, the laser 110 capable of emitting a plurality of light beams with different colors according to the present embodiment may specifically emit three light beams with different colors, where the three light beams with different colors may include a green light beam, a blue light beam, and a red light beam, and exit light paths of the green, blue, and red light beams are all along a first direction, where the green light beam, the blue light beam, and the red light beam can form white light after being converged together. Accordingly, the light-emitting surface of the laser 110 has three different light-emitting areas 111, which are a green light-emitting area 1111 for emitting a green light beam, a blue light-emitting area 1112 for emitting a blue light beam, and a red light-emitting area 1113 for emitting a red light beam.
Similarly, the plurality of lenses 121 specifically include three lenses 121 with different colors, the three lenses 121 with different colors include a green lens, a blue lens and a red lens, and the green lens, the blue lens and the red lens correspond to the green light beam, the blue light beam and the red light beam respectively.
Specifically, the green mirror is arranged on an emergent light path of the green light beam, the blue mirror is arranged on an emergent light path of the blue light beam, the red mirror is arranged on an emergent light path of the red light beam, reflecting surfaces of the green mirror, the blue mirror and the red mirror face the emergent light paths of the corresponding color light beams, namely the reflecting surfaces face the first direction, and an included angle is formed between the reflecting surfaces and the first direction so that the light beams of the corresponding colors are reflected to the second direction. Wherein, no matter the green lens, the blue lens or the red lens, the reflecting surface thereof should be capable of receiving all light rays of the corresponding green, blue and red light beams, so as to ensure the performance of the laser light source 100 and the corresponding effect of the picture projected on the screen; and the reflecting surfaces of the green lens, the blue lens and the red lens are parallel to each other, and the three lenses are arranged in a specific mode to ensure that the reflected green light beams, the reflected blue light beams and the reflected red light beams are converged together in the second direction to form white light.
Optionally, the plurality of lenses 121 includes a reflector 1211, a first optical combiner 1212, and a second optical combiner 1213 sequentially arranged along the light emitting direction of the laser 110. As described above, according to the reflection optical paths of the green, blue and red light beams reflected by the green, blue and red mirrors in the second direction, if the light beam of one or two colors needs to pass through the other mirror 121 to be converged with the light beam of the other color, the other mirror 121 can reflect the light beam of the same color as the other mirror 121, and can pass through the light beam of the other color that needs to pass through the other mirror 121, and the mirror 121 can be set as a light combining mirror. For example, a green mirror only needs to reflect a green beam, and the green mirror may be mirror 1211; the blue lens is a first combiner 1212 that reflects the blue light beam and transmits the green light beam if the green light beam needs to transmit through the blue lens; the green and blue beams need to pass through the red mirror, and the red mirror is a second combiner 1213 for reflecting the red beam and passing through the green and blue beams.
Further, in the case where the light combining mirror assembly 120 includes the mirror 1211, the first light combining mirror 1212, and the second light combining mirror 1213 as described above, the mirror 1211 corresponds to the green light emitting region 1111, and the mirror 1211 is configured to reflect the green light beam; the first light combining mirror 1212 corresponds to the blue light emitting area 1112, and the first light combining mirror 1212 is configured to transmit the green light beam and reflect the blue light beam; the second light combining mirror 1213 corresponds to the red light emitting area 1113, and the second light combining mirror 1213 is configured to transmit the green light beam and the blue light beam and reflect the red light beam.
As shown in fig. 1, the reflector 1211, the first light combining mirror 1212, and the second light combining mirror 1213 are sequentially arranged at intervals in the second direction, that is, the light emitting direction of the laser light source 100, and accordingly, the green light beam, the blue light beam, and the red light beam emitted from the green light emitting region 1111, the blue light emitting region 1112, and the red light emitting region 1113 of the laser 110 along the first direction are also sequentially arranged at intervals in the second direction, and the green light beam, the blue light beam, and the red light beam are correspondingly irradiated onto the reflection surfaces of the reflector 1211, the first light combining mirror 1212, and the second light combining mirror 1213. The spaced mirrors 1211, 1212 and 1213 allow the green, blue and red beams to be reflected in the second direction and to be combined to form white light.
In addition, the reflector 1211, the first light combining mirror 1212 and the second light combining mirror 1213 should not overlap with each other in a direction perpendicular to the light emitting surface of the laser 110, that is, the distance between the mirrors 121 in the second direction should not be too small, if the distance is too small, the mirrors 121 overlap with each other, the mirrors 121 shield each other, and the mirrors 121 cannot effectively reflect the light beams of the corresponding colors, so that the light beams formed by converging the light beams in the second direction may have poor optical performance, and even if one or two of the light beams cannot be reflected to the second direction, white light cannot be formed in the second direction, so that the laser light source 100 cannot function as intended.
The area of the second combiner 1213 is larger than the areas of the first combiner 1212 and the reflector 1211. As shown in fig. 1, the second light combining mirror 1213 corresponds to the red light-emitting region 1113, and the second light combining mirror 1213 is used to reflect the light beam emitted from the red light-emitting region 1113 to the light-emitting direction of the laser light source, and since the area of the light beam emitted from the red light-emitting region 1113 is larger than the areas of the light beams emitted from the blue light-emitting region 1112 and the green light-emitting region 1111, the area of the second light combining mirror 1213 should also be larger than the areas of the first light combining mirror 1212 and the reflecting mirror 1211, so that the second light combining mirror 1213 can receive all the light beams emitted from the red light-emitting region 1113. Specifically, in the case that the light-emitting area of the red light-emitting region 1113 is twice the light-emitting areas of the blue light-emitting region 1112 and the green light-emitting region 1111, that is, the light beam emitted by the red light-emitting region 1113 is twice the light beam emitted by the blue light-emitting region 1112 and the green light-emitting region 1111, the blue light-emitting region 1112 and the green light-emitting region 1111 each include one light-emitting chip, and the red light-emitting region 1113 includes two light-emitting chips, for example, the area of the second light combining mirror 1213 corresponding to the red light-emitting region 1113 should be ensured to be able to receive all the light beams emitted by the two light-emitting chips.
It should be noted that the area of the red light-emitting region 1113 is larger than the area of the blue light-emitting region 1112 and the area of the green light-emitting region 1111, and the area of the second light combining mirror 1213 corresponding to the red light-emitting region 1112 is larger than the area of the first light combining mirror 1212 and the reflecting mirror 1211, so that the red light-emitting region 1113 of the laser 110 emits more red light beams, and the second light combining mirror 1213 can reflect all the red light beams to the light-emitting direction of the laser light source 100, so that the white light formed by converging the light beams reflected by the second light combining mirror 1213, the first light combining mirror 1212 and the reflecting mirror 1211 respectively meets the light efficiency requirement of the laser light source.
Optionally, an included angle between each lens 121 and the corresponding light emitting area is greater than or equal to 43 degrees and less than or equal to 47 degrees. The size of the included angle between the lens 121 and the light outgoing area is about 45 degrees, the light outgoing direction of the light outgoing area 111 is perpendicular to the light outgoing surface, that is to say, the size of the included angle between the lens 121 and the light outgoing direction of the light outgoing area 111 is also about 45 degrees, the light outgoing direction of the light outgoing area 111 is also the first direction, the light outgoing direction of the laser source 100 is also perpendicular to the second direction, the lenses 121 are sequentially arranged at intervals along the second direction, the overall structure of the laser source can be simpler, and the arrangement of the light combining mirror assembly 120 is facilitated.
As shown in fig. 1, in order to make the structure of the laser light source 100 of this embodiment simpler and make the volume of the laser light source 100 smaller, a specific embodiment is that the included angles between the reflection surfaces of the mirror 1211, the first light combining mirror 1212 and the second light combining mirror 1213 and the green light beam, the blue light beam and the red light beam emitted from the first direction are all 45 ° ± 2 °, so that the reflection light paths of the respective light beams reflected by the mirror 1211, the first light combining mirror 1212 and the second light combining mirror 1213 are also the second direction, the included angle between the emission light paths of the respective light beams, that is, the first direction, is about 90 °, the second direction and the first direction are perpendicular to each other, the mirror 1211, the first light combining mirror 1212 and the second light combining mirror 1213 may be arranged at intervals in a second direction perpendicular to the first direction, so that the structure of the light combining mirror 120 composed of the mirror 1211, the first light combining mirror 1212 and the second light combining mirror 1213 is simpler and the space occupied by the mirror 1211 is also smaller.
Moreover, the distance between each lens 121 and the light emitting surface of the laser 110 is greater than or equal to 1mm and less than or equal to 40mm. The mirror 121 is disposed along the light emitting direction of the laser light source 100, that is, the second direction, and the reflection surface of the mirror 121 faces the light emitting surface of the laser 110, that is, the mirror 121 is disposed opposite to the light emitting surface of the laser 110, the distance between the mirror 121 and the light emitting surface of the laser 110 may be set to be 1mm to 40mm, so that the mirror 121 can better receive the light beam emitted from the light emitting area 111 of the laser 110 on the basis of ensuring that the light beam emitted from the light emitting area 111 of the laser 110 can irradiate the reflection surface of the mirror 121.
As for the distance between the reflector 1211, the first light combining mirror 1212 and the second light combining mirror 1213, the distance between the second light combining mirror 1213 and the first light combining mirror 1212 may be greater than or equal to 1mm and less than or equal to 11mm; and/or the distance between the first light combining mirror 1212 and the reflector 1211 is greater than or equal to 0.5mm and less than or equal to 10.5mm.
As shown in fig. 1, the angles between the reflection surfaces of the second combiner 1213, the first combiner 1212, and the reflector 1211 and the first direction may be about 45 °, the second combiner 1213, the first combiner 1212, and the reflector 1211 may be sequentially distributed at intervals in a second direction perpendicular to the first direction, the second combiner 1213 is disposed on the outgoing light path of the red light beam, the first combiner 1212 is disposed on the outgoing light path of the blue light beam, and the reflector 1211 is disposed on the outgoing light path of the green light beam. As for the distance between the lenses 121, if the distance is too small, the lenses 121 may be shielded from each other, so that the area of the light beam reflected by the shielded lenses is small, and the performance of the laser light source 100 may be affected by the light loss caused by the light beam; if the distance between the lenses 121 and the light paths of the light beams of the corresponding colors is too large, the lenses 121 may not reflect all the light beams of the corresponding light beams to the second direction, which also affects the performance of the laser light source 100.
In general, the red beam may contain more light than the blue and green beams for better performance of laser light source 100. In a specific embodiment, as shown in fig. 1, the laser 110 may include two adjacent light emitting chips emitting red light beams and two adjacent light emitting chips emitting blue light beams and two adjacent light emitting chips emitting green light beams, and the reflecting surface of the second light combining mirror 1213 corresponding to the red light beams should be able to receive all the light rays of the two red light beams, so that the distance between the second light combining mirror 1213 and the first light combining mirror 1212 is slightly larger, specifically, the distance between the second light combining mirror 1213 and the first light combining mirror 1212 may be 6 ± 5mm, and the distance between the first light combining mirror 1212 and the reflector 1211 may be 5.5 ± 5mm, so as to ensure that the mirrors 121 are not shielded from each other and each mirror 121 can reflect all the light rays of the corresponding color light beam, thereby providing the laser light source 100 with good performance.
Optionally, the laser light source 100 of the present embodiment further includes a housing 130, the housing 130 has a receiving cavity 131, and the laser 110 and the light combining mirror assembly 120 are at least partially received in the receiving cavity 131; the accommodating chamber 131 has an opening 132 along the light exit direction of the laser light source 100.
As shown in fig. 4, the laser light source 100 of the present embodiment further includes a housing 130, and the housing 130 is used for accommodating and fixing the laser 110 and the light combining mirror assembly 120. Specifically, the relative positions of the laser 110 and the light combining mirror assembly 120 are determined according to the structures of the laser 110 and the light combining mirror assembly 120 and the light path formed therebetween, the housing 130 has an accommodating cavity 131, the laser 110 and the light combining mirror assembly 120 can be accommodated in the accommodating cavity 131, and according to the installation manner of the laser 110 and the light combining mirror assembly 120 on the housing 130, the laser 110 and the light combining mirror assembly 120 can be partially accommodated in the accommodating cavity 131 or can be completely accommodated in the accommodating cavity 131.
The accommodating cavity 131 of the housing 130 may further have an opening 132, a direction of the opening 132 faces a light emitting direction of the laser light source 100, that is, the opening 132 is disposed along the second direction, and the opening 132 is used for allowing the white light formed by converging all the light beams in the second direction to pass through, that is, the white light formed by converging the light beams reflected by the lenses 121 to exit from the opening 132.
Optionally, the laser light source 100 of the present embodiment further includes a lens 140, and the lens 140 is disposed at the opening 132. On the light emitting side of the lens 121, a lens 140 and a light bar 150 may be sequentially disposed along the direction of the opening 132 of the accommodating cavity 131 of the housing 130, and after passing through the opening 132, the white light is condensed by the lens 140, and then is homogenized by the light bar 150.
Specifically, the distance between the optical axis of the lens 140 and the light emitting surface of the laser 110 is greater than or equal to 6mm. Thus, after the light beam emitted from the light-emitting surface of the laser 110 is reflected by the mirror 121, the reflected light beam can irradiate the lens 140, so that the lens 140 can receive the reflected light beam, and the overall structure of the laser light source 100 can be smaller. The specific distance between the optical axis of the lens 140 and the light-emitting surface of the laser 110 can be determined according to the distance between the lens 121 and the light-emitting surface of the laser 110, so as to ensure that the lens 140 can receive all the light beams reflected by the lens 121.
Additionally, the diameter of the lens 140 may be greater than 20mm. The diameter of the lens 140 is greater than 20mm, so that the lens 140 has a sufficient light-gathering area, all the light beams reflected by all the lenses 121 can be irradiated onto the lens 140, and the lens 140 can gather all the irradiated light beams, thereby ensuring that the laser light source 100 has good optical performance.
And, in another implementation, a diffuser plate or wheel structure may also be disposed between the lens 140 and the light bar 150. For example, according to the requirement of the light collection angle of the system, a diffusion sheet or a diffusion wheel is disposed at a distance of about 2mm from the light entrance of the light bar 150, or a diffusion sheet or a diffusion wheel is disposed at a distance of 20mm from the light exit surface of the lens 140.
In addition, the laser light source 100 of this embodiment may further include a circuit board 160, the laser 110 needs to be connected to the circuit board 160, and the circuit board 160 conducts the laser 110, so that the light emitting area 111 of the light emitting surface of the laser 110 can emit a light beam. Fig. 5 is a schematic structural diagram of connection between a laser and a circuit board according to an embodiment of the present invention. As shown in fig. 5, the circuit board 160 may be disposed around the side wall of the laser 110, the circuit board 160 has a planar structure, and the circuit board 160 and the laser 110 are located in almost the same plane, so that the overall structure of the laser 110 and the circuit board 160 is simpler.
The laser 110 is provided with a pin 112, the pin 112 is used for transmitting a signal to enable the light emitting area 111 of the laser 110 to emit a light beam, the pin 112 may be disposed on a side surface of the laser 110, one end of the pin 112 is fixed on a side wall of the laser 110, and the other end of the pin 112 extends out of the laser 110. The circuit board 160 is electrically connected to the pins 112 of the laser 110 to electrically connect the laser 110 and the circuit board 160. In addition, the laser 110 may be secured to the housing 130 by a secure connection of a circuit board 160 on the periphery of the side wall of the laser 110 to the housing 130.
As shown in fig. 5, in a possible implementation, there may be one circuit board 160, and the circuit board 160 may have a receiving area 161, and the laser 110 is located in the receiving area 161. Specifically, the middle portion of the circuit board 160 may be provided with an accommodating area 161, the shape, size, etc. of the accommodating area 161 match with the laser 110, the laser 110 is located in the accommodating area 161, and the pins 112 on the side of the laser 110 extend out to a side surface of the circuit board 160 and are connected to the circuit board 160 in a welding manner.
Another possible embodiment is that there are two circuit boards 160, the two circuit boards 160 are respectively located at two sides of the laser 110, the two circuit boards 160 respectively correspond to the pins 112 at two sides of the laser 110, the pins 112 at two sides of the laser 110 are respectively soldered on the same side surface of the two circuit boards 160, and the two circuit boards 160 are located in the same horizontal plane, so that the pins 112 at two sides of the laser 110 are respectively and simultaneously lapped on the same side surface of the two circuit boards 160. In addition, the two circuit boards 160 on two sides of the laser 110 may be connected into a whole, and the two circuit boards 160 may also be respectively and fixedly connected to two sides of the laser 110 having the pins 112.
The laser light source of the embodiment comprises a laser and a light-combining mirror assembly; the light emitting surface of the laser is provided with a plurality of light emitting areas, and the colors of light beams emitted by different light emitting areas are different; the light combining mirror assembly comprises a plurality of mirrors, the plurality of mirrors are sequentially arranged on a light transmission path of the laser, different mirrors correspond to different light emitting areas, an included angle is formed between each mirror and the light emitting direction of the corresponding light emitting area and used for reflecting light beams emitted by the corresponding light emitting areas to the light emitting direction of the laser light source, the mirrors are sequentially arranged along the light emitting direction of the laser light source, and at least one mirror can penetrate light beams reflected by other mirrors so that the light beams reflected by the mirrors and the light beams transmitted by the mirrors are emitted along the light emitting direction of the laser light source. The light combining mirror assembly is arranged on the light transmission path of the light beam emitted by the laser, different lenses of the light combining mirror assembly correspond to corresponding light emitting areas of the laser one by one, the lens with an included angle with the light emitting direction of the light emitting areas can reflect the light beam emitted by the light emitting areas to the light emitting direction of the laser source, and at least one lens can penetrate the light beams reflected by other lenses, so that the light beams reflected by all the lenses can be emitted along the light emitting direction of the laser source, and the laser source formed by the laser capable of emitting the light beams with different colors and the light combining mirror assembly with a plurality of lenses corresponding to the light emitting areas is simple in structure and small in size.
Fig. 6 is a schematic structural diagram of a laser projection apparatus according to a second embodiment of the present invention. As shown in fig. 6, the laser projection apparatus 300 provided in this embodiment includes the laser light source 100 according to the first embodiment. The laser projection apparatus provided in this embodiment mainly includes a laser light source 100, a light valve (not shown), and a lens 200.
The laser light source 100 includes a laser 110 and a light-combining mirror assembly 120; the light emitting surface of the laser 110 has a plurality of light emitting areas 111, and the light beams emitted by different light emitting areas 111 have different colors; the light combining mirror assembly 120 includes a plurality of mirrors 121, the plurality of mirrors 121 are disposed on a light transmission path of the laser at intervals, different mirrors 121 correspond to different light emitting areas 111, an included angle is formed between the mirror 121 and a light emitting direction of the light emitting area 111, and is used for reflecting light beams emitted from the corresponding light emitting area 111 to the light emitting direction of the laser light source 100, the mirrors 121 are all sequentially arranged along the light emitting direction of the laser light source 100, and at least one mirror 121 can transmit light beams of corresponding colors of other light emitting areas 111, so that the light beams reflected by the mirror 121 are all emitted along the light emitting direction of the laser light source 100.
The laser 110 of the laser light source 100 may have a plurality of light emitting areas 111 emitting light beams of different colors sequentially arranged on a light emitting surface thereof at intervals, light emitting paths of the light beams of different colors emitted from the light emitting areas 111 all extend along a first direction, the light combining mirror assembly 120 includes a plurality of mirrors 121 of different colors, the plurality of mirrors 121 correspond to the light emitting areas 111 one by one, the mirrors 121 are arranged on the light emitting paths of the light emitting areas 111 emitting light beams of corresponding colors, the corresponding mirrors 121 may reflect the light beams of corresponding colors, the reflected light beams all extend along a second direction, and the light beams in the second direction may converge to form white light.
The detailed structure, function and operation principle of the laser light source 100 have been described in detail in the first embodiment, and are not described herein again.
Optionally, the laser projection apparatus 300 further includes a diffusion sheet and a light bar 150, the diffusion sheet is disposed on the light exit path of the laser light source 100, and the light beam diffused by the diffusion sheet enters the light bar 150.
Specifically, the laser projection apparatus 300 further includes a lens 140, a diffusion sheet, a light bar 150, and other components, which are disposed opposite to the laser light source 100, the laser light source 100 is used for emitting laser light and forming a light source optical path, a light beam emitted in the light emitting direction of the laser light source 100 passes through the lens 140, and the lens 140 condenses the light beam; the light beam condensed by the lens 140 passes through a diffusion sheet which can be a rotary diffusion sheet and can eliminate speckles on the light beam so as to improve the quality of the light beam and reduce the speckle effect of a projected image; the light beam is irradiated to the light bar 150, the light bar 150 can perform a homogenization process on the light beam, and the laser projection apparatus 300 may further include a light valve, which receives the emergent light of the light bar 150 and projects the light into the lens 200 for imaging.
The laser projection device of the embodiment comprises a laser light source, wherein the laser light source comprises a laser and a light-combining mirror assembly; the light emitting surface of the laser is provided with a plurality of light emitting areas, and the colors of light beams emitted by different light emitting areas are different; the light combining mirror assembly comprises a plurality of mirrors, the mirrors are sequentially arranged on a light transmission path of the laser, different mirrors correspond to different light emitting areas, an included angle is formed between each mirror and the light emitting direction of the corresponding light emitting area and used for reflecting light beams emitted by the corresponding light emitting area to the light emitting direction of the laser light source, the mirrors are sequentially arranged along the light emitting direction of the laser light source, and at least one mirror can penetrate light beams with corresponding colors of other light emitting areas so that the light beams reflected by the mirrors are emitted along the light emitting direction of the laser light source. Therefore, the laser light source formed by the laser and the reflector component has a simple structure and a small volume.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The laser light source is characterized by comprising a laser and a circuit board, wherein the laser is connected with the circuit board, and the circuit board conducts the laser to enable a light emitting area of a light emitting surface of the laser to emit light beams;
the light emitting area of the laser comprises a green light emitting area for emitting a green light beam, a blue light emitting area for emitting a blue light beam and a red light emitting area for emitting a red light beam;
the light emitting area of the red light emitting area is larger than the light emitting areas of the blue light emitting area and the green light emitting area;
the laser light source also comprises a light combining mirror assembly, the light combining mirror assembly is used for combining light beams emitted by the laser, the light combining mirror assembly comprises a plurality of mirrors, and the plurality of mirrors are not overlapped with each other in a direction perpendicular to the light emitting surface of the laser;
the plurality of lenses respectively correspond to the green light emitting region, the blue light emitting region and the red light emitting region, and the area of the lens corresponding to the red light emitting region for receiving the red light beam is larger than the area of the lens corresponding to the blue light emitting region for receiving the blue light beam and the area of the lens corresponding to the green light emitting region for receiving the green light beam.
2. The laser light source of claim 1, wherein the plurality of mirrors include a mirror corresponding to the green light-emitting region for reflecting the light beam emitted from the green light-emitting region, and a first light-combining mirror corresponding to the blue light-emitting region for reflecting the light beam emitted from the blue light-emitting region and transmitting the light beam corresponding to the green light-emitting region;
the distance between the reflector and the first light combining mirror is greater than or equal to 0.5mm and less than or equal to 10.5mm.
3. The laser light source of claim 2, wherein the plurality of lenses further includes a second light combining mirror corresponding to the red light emitting area, the second light combining mirror being configured to combine the light beams emitted by the laser;
the distance between the second light-combining lens and the first light-combining lens is larger than or equal to 1mm and smaller than or equal to 11mm.
4. The laser light source according to claims 1 to 3, wherein a light emitting area of the red light emitting region is twice as large as a light emitting area of the blue light emitting region and a light emitting area of the green light emitting region.
5. The laser light source of claims 1-3, wherein the distance between the plurality of lenses and the light exit surface is greater than or equal to 1mm and less than or equal to 40mm.
6. The laser light source according to claim 1, wherein the circuit board defines a receiving area, the circuit board is disposed around a sidewall of the laser, and the laser is located in the receiving area.
7. The laser light source of claim 6, wherein the laser comprises a pin, one end of the pin is fixed on the side wall of the laser, and the other end of the pin extends out of the laser to one side surface of the circuit board and is connected with the circuit board in a welding mode.
8. The laser light source of claim 1, further comprising a housing having a receiving cavity, wherein the laser and the light combining mirror assembly are at least partially received in the receiving cavity, and the receiving cavity has an opening along a light emitting direction of the laser light source.
9. A laser projection device comprising the laser light source of any one of claims 1-8, further comprising a light valve and a lens, and further comprising:
and the lens is arranged at an opening of an accommodating cavity formed by the shell of the laser light source and is used for condensing the light combining beam emitted by the laser light source.
10. The laser projection device of claim 9, further comprising a diffusing structure disposed on an exit path of the lens.
CN202211595861.XA 2019-02-20 2019-02-20 Laser light source and laser projector Pending CN115755509A (en)

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