CN113687570B - Laser light source system and laser projection apparatus - Google Patents

Laser light source system and laser projection apparatus Download PDF

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Publication number
CN113687570B
CN113687570B CN202110875271.1A CN202110875271A CN113687570B CN 113687570 B CN113687570 B CN 113687570B CN 202110875271 A CN202110875271 A CN 202110875271A CN 113687570 B CN113687570 B CN 113687570B
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Prior art keywords
light
light source
blue
laser
combining
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CN202110875271.1A
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CN113687570A (en
Inventor
陈红运
严双涛
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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Priority to CN202110875271.1A priority Critical patent/CN113687570B/en
Publication of CN113687570A publication Critical patent/CN113687570A/en
Priority to PCT/CN2022/105594 priority patent/WO2023005673A1/en
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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
    • G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
    • 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
    • G03B21/2073—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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)

Abstract

The invention provides a laser light source system and laser projection equipment, which comprises a first excitation light source, a second light source, a first light homogenizing element, a second light homogenizing element, a wavelength conversion device and a light splitting and combining device; the light splitting and combining device reflects the first blue light to the fluorescent layer, and carries out wavelength conversion to obtain yellow stimulated luminescence; the light splitting and combining device transmits the yellow stimulated luminescence to reflect the second blue light, and outputs the yellow stimulated luminescence and the second blue light after combining. The invention generates yellow stimulated luminescence after the first blue light emitted by the first excitation light source passes through the wavelength conversion device, and the yellow stimulated luminescence and the second blue light emitted by the second light source form white light output, so that the invention has the advantages of simple integral structure, lower cost, high light emitting efficiency and the like.

Description

Laser light source system and laser projection apparatus
Technical Field
The invention relates to the technical field of laser projection, in particular to a laser light source system and laser projection equipment.
Background
The laser is a light source which emits monochromatic coherent light beams with high brightness and strong directivity, and the laser light source is used as an excellent coherent light source and has the advantages of good monochromaticity, strong directivity, high light flux and the like. In the technical field of laser projection, generally, a laser light source with three colors of red, green and blue is used for mixing colors to obtain white light output, but the scheme has the defects of complex structure, high cost, low light emitting efficiency and the like.
Disclosure of Invention
The embodiment of the invention provides a laser light source system and laser projection equipment, which are used for solving the technical problems of complex structure, high cost and low light emitting efficiency of the laser light source system and the laser projection equipment.
In order to solve the above technical problems, the present invention provides a laser light source system, including: the device comprises a first excitation light source, a second light source, a first light homogenizing element, a second light homogenizing element, a wavelength conversion device and a light splitting and combining device;
the first excitation light source emits first blue light, and the second light source emits second blue light;
the first light homogenizing element is arranged between the first excitation light source and the light splitting and combining device, and the second light homogenizing element is arranged between the second light source and the light splitting and combining device;
the wavelength conversion device comprises a fluorescent layer and a substrate with a reflecting surface, wherein the fluorescent layer is arranged on the reflecting surface of the substrate, or the wavelength conversion device comprises the fluorescent layer, the substrate and the reflecting layer, and the reflecting layer is positioned between the substrate and the fluorescent layer;
the light splitting and combining device reflects first blue light emitted by the first excitation light source to the fluorescent layer, and the fluorescent layer receives the first blue light emitted by the first excitation light source and converts wavelength to obtain yellow excited light;
the light splitting and combining device transmits the yellow stimulated luminescence and reflects the second blue light, and outputs the yellow stimulated luminescence and the second blue light after light combining.
The present invention provides another laser light source system, comprising: the device comprises a first excitation light source, a second light source, a first light homogenizing element, a second light homogenizing element, a wavelength conversion device and a light splitting and combining device;
the first excitation light source emits first blue light, and the second light source emits second blue light;
the first light homogenizing element is arranged between the first excitation light source and the light splitting and combining device, and the second light homogenizing element is arranged between the second light source and the light splitting and combining device;
the wavelength conversion device comprises a fluorescent layer and a substrate with a reflecting surface, wherein the fluorescent layer is arranged on the reflecting surface of the substrate, or the wavelength conversion device comprises the fluorescent layer, the substrate and the reflecting layer, and the reflecting layer is positioned between the substrate and the fluorescent layer;
the light splitting and combining device transmits first blue light emitted by the first excitation light source to the fluorescent layer, and the fluorescent layer receives the first blue light emitted by the first excitation light source and converts wavelength to obtain yellow excited light;
the light splitting and combining device reflects the yellow stimulated luminescence and transmits the second blue light, and outputs the yellow stimulated luminescence and the second blue light after light combining.
In some of these embodiments, the phosphor layer has a thickness of 0.3mm or less.
In some embodiments, the laser light source system further includes a first scattering element disposed between the first excitation light source and the first light homogenizing element, the first scattering element being configured to scatter and homogenize the first blue light emitted by the first excitation light source.
In some embodiments, the laser light source system further includes a second scattering element disposed between the second light source and the second light homogenizing element, the second scattering element being configured to scatter and homogenize the second blue light emitted by the second light source.
In some embodiments, the laser light source system further includes a first mirror and a first lens group, and the first mirror and the first lens group are sequentially disposed between the first excitation light source and the light splitting and combining device.
In some embodiments, the laser light source system further comprises a second reflecting mirror and a second lens group, and the second reflecting mirror and the second lens group are sequentially arranged between the second light source and the light splitting and combining device.
In some embodiments, the first excitation light source includes a first blue laser array, a second blue laser array, and a polarization combining element; the planes of the first blue light laser array and the second blue light laser array are perpendicular to each other, the polarization light combining element is positioned between the first blue light laser array and the second blue light laser array, and the polarization light combining element is intersected with the planes of the first blue light laser array and the second blue light laser array; the polarization states of the light emitted by the first blue light exciter array and the light emitted by the second blue light exciter array are different, and the polarization light combining element performs light combining output on the light emitted by the first blue light laser array and the light emitted by the second blue light laser array to obtain the first blue light.
In some of these embodiments, the laser light source system further includes a third lens group disposed between the light splitting and combining device and the wavelength conversion device.
In some embodiments, the wavelength conversion device is disposed in a closed housing, the housing is provided with a light-transmitting port, and the third lens group is disposed in the light-transmitting port of the housing.
In some of these embodiments, the wavelength conversion means is arranged on the optical path of the first blue light, movable relative to each other.
The invention also provides laser projection equipment, which comprises a light machine, a lens and the laser light source system, wherein the laser light source system is used for providing a light source beam for the light machine, the light machine is used for modulating the light source beam and outputting the light source beam to the lens, and the lens is used for imaging and projecting the light source beam to a projection medium to form a projection picture.
Compared with the prior art, the invention has at least the following beneficial effects: the first blue light emitted by the first excitation light source passes through the wavelength conversion device to generate yellow excited light, and the yellow excited light is combined with the second blue light emitted by the second light source to form white light output, so that the white light LED light source has the advantages of simple integral structure, lower cost and high light emitting efficiency; the first blue light is scattered and homogenized through the first scattering element, and the second blue light is scattered and homogenized through the second scattering element, so that the speckle phenomenon of the output white light can be effectively reduced; the first reflecting mirror, the first lens group, the second reflecting mirror, the second lens group and the third lens group are arranged, so that the space occupied by the whole laser light source system is saved, the size of the light splitting and combining device is reduced, and the size of the wavelength conversion device is reduced; by arranging the first blue laser array, the second blue laser array and the polarization light combining element, the space occupied by the first excitation light source can be reduced, and the first blue light with high brightness can be obtained; by arranging the wavelength conversion device in the closed shell, the dustproof effect of the wavelength conversion device can be improved, the service life of the wavelength conversion device can be prolonged, and high-purity yellow stimulated luminescence can be obtained; by arranging the wavelength conversion device and the first blue light in a movable manner relative to each other, the heat dissipation effect of the wavelength conversion device can be improved, and the service life of the wavelength conversion device can be further prolonged; by setting the lighting time of the first excitation light source and the second light source in the same period, polychromatic light can be emitted simultaneously in the same period, the light output amount in unit time is improved, or continuously output white light is obtained.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present 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 schematic diagram of a laser source system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another laser source system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a first structure of a wavelength conversion device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a second structure of a wavelength conversion device according to an embodiment of the present invention;
fig. 5 is a schematic view showing the structures of a housing, a wavelength conversion device, and a third lens group in an embodiment of the present invention;
FIG. 6 is a first timing diagram of the first excitation light source and the second excitation light source being illuminated in the same cycle in an embodiment of the present invention;
FIG. 7 is a second timing diagram of the first excitation light source and the second light source being illuminated during the same cycle in an embodiment of the present invention;
FIG. 8 is a third timing diagram of the first and second light sources being illuminated during the same cycle in an embodiment of the present invention.
Detailed Description
In order to facilitate an understanding of the embodiments of the present invention, the embodiments of the present invention will be described more fully below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the examples of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In the present invention, the terms "mounted," "connected," "secured," and the like are to be construed broadly unless otherwise specifically indicated or defined. For example, the connection can be fixed connection, detachable connection or integral connection; can be mechanically or electrically connected; the connection may be direct, indirect, or internal, or may be surface contact only, or may be surface contact via an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, the term "plurality" in the present invention means greater than or equal to two. The terms "first," "second," and the like are used merely to distinguish between descriptions and should not be construed to refer to a particular or a particular structure. The description of the terms "some embodiments," "other embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In the present invention, the schematic representations of the above terms are not necessarily for the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples of the present invention and features of various embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The embodiment of the invention provides a laser light source system, as shown in fig. 1, which comprises a first excitation light source 1, a second light source 2, a first light homogenizing element 31, a second light homogenizing element 32, a wavelength conversion device 4 and a light splitting and combining device 5.
The first excitation light source 1 is arranged to emit first blue light 11 and the second light source 2 is arranged to emit second blue light 21. The first excitation light source 1 is a laser light source, and the second light source 2 may be a laser light source or other light sources such as an LED light source; the wavelength of the first blue light 11 may be the same as or different from the wavelength of the second blue light 21.
The first light equalizing element 31 is disposed between the first excitation light source 1 and the light splitting and combining device 5, and the second light equalizing element 32 is disposed between the second light source 2 and the light splitting and combining device 5. The first light homogenizing element 31 is used for homogenizing the first blue light 11 emitted by the first excitation light source 1, and the second light homogenizing element 32 is used for homogenizing the second blue light 21 emitted by the second light source 2; the first blue light 11 and the second blue light 21 after the light homogenizing treatment can obtain higher light energy utilization rate and more uniform illuminance. In the embodiment of the present invention, the first light homogenizing element 31 may be a light homogenizing rod or a fly eye lens, etc., and the second light homogenizing element 32 may be a light homogenizing rod or a fly eye lens, etc.
As shown in fig. 3, in some alternative embodiments, the wavelength conversion device 4 includes a fluorescent layer 41 and a substrate 42 having a reflective surface 421, the fluorescent layer 41 being disposed on the reflective surface 421 of the substrate 42; that is, the substrate 42 itself has a reflection function, and the wavelength conversion device 4 includes a two-layer structure of the fluorescent layer 41 and the substrate 42 having a reflection function. As shown in fig. 4, in some alternative embodiments, the wavelength conversion device 4 includes a phosphor layer 41, a substrate 42, and a reflective layer 43, the reflective layer 43 being located between the substrate 42 and the phosphor layer 41; that is, the substrate 42 itself does not have a reflection function, and functions to carry the reflection layer 43 and the fluorescent layer 41, and the wavelength conversion device 4 includes a three-layer structure of the fluorescent layer 41, the substrate 42, and the reflection layer 43.
As shown in fig. 1, the light splitting and combining device 5 has a characteristic of reflecting blue light and transmitting yellow light. In the embodiment of the present invention, the light splitting and combining device 5 may be a dichroic plate, and the dichroic plate has the characteristic of reflecting light of one part of the wave band and transmitting light of another part of the wave band, so that the purposes of reflecting blue light and transmitting yellow light can be achieved.
As shown in fig. 1, 3 and 4, the light splitting and combining device 5 reflects the first blue light 11 to the fluorescent layer 41 of the wavelength conversion device 4, and the fluorescent layer 41 of the wavelength conversion device 4 receives the first blue light 11 and performs wavelength conversion on the first blue light 11 to obtain yellow stimulated luminescence 44; the reflection surface 421 of the substrate 42 or the reflection layer 43 of the wavelength conversion device 4 reflects the yellow stimulated luminescence light 44, and the yellow stimulated luminescence light 44 is emitted to the spectral light combining device 5. The light splitting and combining device 5 transmits the yellow stimulated emission light 44 and reflects the second blue light 21, and the second blue light 21 reflected by the light splitting and combining device 5 combines with the yellow stimulated emission light 44 transmitted by the light splitting and combining device 5 to output light.
Specifically, the light splitting and combining device 5 has a first surface and a second surface that are disposed opposite to each other, and in fig. 1, the first surface is a top left surface of the light splitting and combining device 5, and the second surface is a bottom right surface of the light splitting and combining device 5. The first blue light 11 is incident on the first surface of the light splitting/combining device 5, reflected on the first surface of the light splitting/combining device 5, and incident on the fluorescent layer 41 of the wavelength conversion device 4, and yellow stimulated emission 44 is generated and incident on the light splitting/combining device 5 through the reflective surface 421 of the substrate 42 or the reflective layer 43 of the wavelength conversion device 4, and the yellow stimulated emission 44 is transmitted through the first surface and the second surface of the light splitting/combining device 5, and the yellow stimulated emission 44 is emitted from the second surface of the light splitting/combining device 5. The second blue light 21 is incident on the second surface of the light splitting and combining device 5, is reflected on the second surface of the light splitting and combining device 5, and the second blue light 21 reflected by the light splitting and combining device 5 and the yellow stimulated emission light 44 transmitted by the light splitting and combining device 5 are combined to obtain white light.
The embodiment of the invention also provides another laser light source system, as shown in fig. 2, which comprises a first excitation light source 1, a second light source 2, a first light homogenizing element 31, a second light homogenizing element 32, a wavelength conversion device 4 and a light splitting and combining device 5.
The first excitation light source 1 is arranged to emit first blue light 11 and the second light source 2 is arranged to emit second blue light 21. The first excitation light source 1 is a laser light source, and the second light source 2 may be a laser light source or other light sources such as an LED light source; the wavelength of the first blue light 11 may be the same as or different from the wavelength of the second blue light 21.
The first light equalizing element 31 is disposed between the first excitation light source 1 and the light splitting and combining device 5, and the second light equalizing element 32 is disposed between the second light source 2 and the light splitting and combining device 5. The first light homogenizing element 31 is used for homogenizing the first blue light 11 emitted by the first excitation light source 1, and the second light homogenizing element 32 is used for homogenizing the second blue light 21 emitted by the second light source 2; the first blue light 11 and the second blue light 21 after the light homogenizing treatment can obtain higher light energy utilization rate and more uniform illuminance. In the embodiment of the present invention, the first light homogenizing element 31 may be a light homogenizing rod or a fly eye lens, etc., and the second light homogenizing element 32 may be a light homogenizing rod or a fly eye lens, etc.
As shown in fig. 3, in some alternative embodiments, the wavelength conversion device 4 includes a fluorescent layer 41 and a substrate 42 having a reflective surface 421, the fluorescent layer 41 being disposed on the reflective surface 421 of the substrate 42; that is, the substrate 42 itself has a reflection function, and the wavelength conversion device 4 includes a two-layer structure of the fluorescent layer 41 and the substrate 42 having a reflection function. As shown in fig. 4, in some alternative embodiments, the wavelength conversion device 4 includes a phosphor layer 41, a substrate 42, and a reflective layer 43, the reflective layer 43 being located between the substrate 42 and the phosphor layer 41; that is, the substrate 42 itself does not have a reflection function, and functions to carry the reflection layer 43 and the fluorescent layer 41, and the wavelength conversion device 4 includes a three-layer structure of the fluorescent layer 41, the substrate 42, and the reflection layer 43.
As shown in fig. 2, the light splitting and combining device 5 has a property of transmitting blue light and reflecting yellow light. In the embodiment of the present invention, the light splitting and combining device 5 may be a dichroic plate, where the dichroic plate has a characteristic of reflecting light of a part of the wavelength band and transmitting light of another part of the wavelength band, so as to achieve the purposes of transmitting blue light and reflecting yellow light.
As shown in fig. 2, 3 and 4, the light splitting and combining device 5 transmits the first blue light 11 to the fluorescent layer 41 of the wavelength conversion device 4, and the fluorescent layer 41 of the wavelength conversion device 4 receives the first blue light 11 and performs wavelength conversion on the first blue light 11 to obtain yellow stimulated luminescence 44; the reflection surface 421 of the substrate 42 or the reflection layer 43 of the wavelength conversion device 4 reflects the yellow stimulated luminescence light 44, and the yellow stimulated luminescence light 44 is emitted to the spectral light combining device 5. The light splitting and combining device 5 reflects the yellow stimulated emission light 44 and transmits the second blue light 21, and the second blue light 21 transmitted by the light splitting and combining device 5 combines with the yellow stimulated emission light 44 reflected by the light splitting and combining device 5 to output light.
Specifically, the light splitting and combining device 5 has a first surface and a second surface that are disposed opposite to each other, and in fig. 2, the first surface is the upper left surface of the light splitting and combining device 5, and the second surface is the lower right surface of the light splitting and combining device 5. The first blue light 11 is transmitted to the second surface of the spectral light combining device 5 and transmitted to the second surface and the first surface of the spectral light combining device 5, and then is transmitted to the fluorescent layer 41 of the wavelength conversion device 4, and the yellow stimulated emission 44 is generated and transmitted to the spectral light combining device 5 through the reflective surface 421 of the substrate 42 or the reflective layer 43 of the wavelength conversion device 4, and the yellow stimulated emission 44 is reflected and emitted from the first surface of the spectral light combining device 5. The second blue light 21 is emitted to the second surface of the light splitting and combining device 5, and is transmitted to the second surface and the first surface of the light splitting and combining device 5, and then is combined with the yellow stimulated luminescence 44 reflected by the light splitting and combining device 5 to obtain white light.
As shown in fig. 3 and 4, in some alternative embodiments, the thickness of phosphor layer 41 is less than or equal to 0.4mm, or less than or equal to 0.3mm, or less than or equal to 0.15mm; in a more preferred embodiment, the thickness of the fluorescent layer 41 is 0.3mm or less. Under the condition that the thickness of the fluorescent layer 41 is smaller than or equal to 0.3mm, the fluorescent powder in the fluorescent layer 41 can be fully excited to emit yellow excited 44 light and reflected back to an emergent light path, meanwhile, the enrichment of heat in the fluorescent layer 41 can be reduced, the excitation efficiency of the fluorescent layer 41 is improved, and the service life of the fluorescent layer 41 is guaranteed.
In some alternative embodiments, as shown in fig. 1 and 2, the laser light source system further includes a first scattering element 61, where the first scattering element 61 is disposed between the first excitation light source 1 and the first light homogenizing element 31, and the first scattering element 61 is configured to scatter and homogenize the first blue light 11 emitted by the first excitation light source 1. The scattered and homogenized first blue light 11 is further homogenized by a first homogenizing element 31. The scattered and homogenized first blue light 11 is not prone to interference, thereby reducing speckle of the output white light. In an embodiment of the present invention, the first scattering element 61 may be a scattering sheet.
In some alternative embodiments, as shown in fig. 1 and 2, the laser light source system further includes a second scattering element 62, where the second scattering element 62 is disposed between the second light source 2 and the second light homogenizing element 32, and the second scattering element 62 is configured to scatter and homogenize the second blue light 21 emitted by the second light source 2. The scattered and homogenized second blue light 21 is further homogenized by a second homogenizing element 32. The scattered and homogenized second blue light 21 is less likely to interfere, thereby reducing speckle of the output white light. In an embodiment of the present invention, the second scattering element 62 may be a scattering sheet.
In some alternative embodiments, as shown in fig. 1, the laser light source system further includes a first mirror 71 and a first lens group 72, where the first mirror 71 and the first lens group 72 are sequentially disposed between the first excitation light source 1 and the light splitting and combining device 5. The first blue light 11 can change the direction of the light path through the first reflecting mirror 71, which is beneficial to saving the space occupied by the whole laser light source system; the first blue light 11 can be collected by the first lens group 72, which is beneficial to reducing the volume of the light splitting and combining device 5.
In some alternative embodiments, as shown in fig. 1 and 2, the laser light source system further includes a second reflecting mirror 73 and a second lens group 74, and the second reflecting mirror 73 and the second lens group 74 are sequentially disposed between the second light source 2 and the light splitting and combining device 5. The second blue light 21 can change the direction of the light path through the second reflecting mirror 73, which is beneficial to saving the space occupied by the whole laser light source system; the second blue light 21 can be collected by the second lens group 74, which is beneficial to reducing the volume of the light splitting and combining device 6.
In some alternative embodiments, as shown in fig. 1 and 2, the first excitation light source 1 includes a first blue laser array 12, a second blue laser array 13, and a polarization combining element 14. The planes of the first blue laser array 12 and the second blue laser array 13 are perpendicular to each other, the polarization light combining element 14 is located between the first blue laser array 12 and the second blue laser array 13, and the polarization light combining element 14 is intersected with the planes of the first blue laser array 12 and the second blue laser array 13. The light emitted by the first blue light exciter array 12 and the light emitted by the second blue light exciter array 13 have different polarization states, and the polarization light combining element 14 combines the light emitted by the first blue light laser array 12 and the light emitted by the second blue light laser array 13 to obtain first blue light 11.
Specifically, the first blue laser array 12 is provided with 16 blue lasers arranged in a rectangular array, and the second blue laser 13 is provided with 16 blue lasers arranged in a rectangular array; compared with the arrangement of 32 blue lasers in a rectangular array on the same plane, the first blue laser array 12 and the second blue laser array 13 which are arranged vertically to each other obviously can more reasonably utilize the space, and reduce the space occupied by the first excitation light source 1. Specifically, the first blue laser array 12 may emit P-polarized blue light 121, and the second blue laser array 13 may emit S-polarized blue light 131; the polarization light combining element 14 is capable of transmitting the P-polarized blue light 121 and reflecting the S-polarized blue light 131, and the P-polarized blue light 121 and the S-polarized blue light 131 are subjected to polarization light combining by the polarization light combining element 14 and then output the first blue light 11; the first blue light 11 having high brightness can be obtained by combining the light emitted from the first blue laser array 12 and the light emitted from the second blue laser array 13 by the polarization combining element 14.
In some alternative embodiments, as shown in fig. 1 and 2, the laser light source system further includes a third lens group 75, and the third lens group 75 is disposed between the spectral light combining device 5 and the wavelength conversion device 4. The first blue light 11 reflected by the light splitting and combining device 5 can be collected by the third lens group 75, which is beneficial to reducing the size of the wavelength conversion device 4 or reducing the material of the fluorescent layer 41 of the wavelength conversion device 4.
In some alternative embodiments, as shown in fig. 1, 2 and 4, the wavelength conversion device 4 is disposed in a closed housing 8, the housing 8 is provided with a light-passing opening 81, and the third lens group 75 is disposed in the light-passing opening 81 of the housing 8. By arranging the wavelength conversion device 4 in a closed housing, the dustproof effect of the wavelength conversion device 4 can be improved, which is beneficial to prolonging the service life of the wavelength conversion device 4; but also reduces the interference and influence of external light on the wavelength conversion device 4 to obtain high purity yellow stimulated luminescence 44.
In some alternative embodiments, as shown in fig. 1 and 2, the wavelength conversion device 4 is disposed on the optical path of the first blue light 11 and is movable relative to each other, which is advantageous for improving the heat dissipation effect of the wavelength conversion device 4, and further improving the service life of the wavelength conversion device 4. In particular, the wavelength conversion device 4 and the first blue light 11 may be movable relative to each other in a circular rotation or a reciprocating linear motion, etc.
In some alternative embodiments, the lighting periods of the first excitation light source 1 and the second light source 2 coincide within the same period. For example, as shown in FIG. 5, in the same period t 1 In the range of 0 to 0 of the first excitation light source 1Is extinguished within a period of time of +.>To->Is lit up in the period of +.>To t 1 Is extinguished during the period of time; the second light source 2 is at 0 to +.>Is extinguished within a period of time of +.>To t 1 Is lightened in a period of time; then first exciteThe light source 1 and the second light source 2 are in +.>To->Is lit, i.e. the first excitation light source 1 and the second light source 2 are lit for a period of time of +.>To->Overlapping; at this time, the laser light source system is at 0 to +.>Is extinguished within a period of time of +.>To->Blue light is output within the period of +.>To->Outputs white light during a period of time of (2)To t 1 Outputs yellow light during a period of time. By providing the first excitation light source 1 and the second light source 2 to overlap each other in the lighting period in the same period, polychromatic light can be emitted simultaneously in the same period, and the light output per unit time can be improved.
In some alternative embodiments, the first excitation light source illuminates the entire cycle and the second light source illuminates a portion of the cycle or the entire cycle within the same cycle. For example, as shown in FIG. 6,in the same period t 2 In the first excitation light source 1 is between 0 and t 2 Is lightened in a period of time; the second light source 2 is between 0 andis extinguished within a period of time of +.>To t 1 Is lightened in a period of time; at this time, the laser light source system is at 0 to +.>Outputs yellow light within the period of +.>To t 1 White light is output during the period of time. By setting the first excitation light source 1 to light the whole period in the same period and the second excitation light source 2 to light part of the period in the same period, polychromatic light can be emitted simultaneously in the same period, and the light output per unit time can be improved. As shown in fig. 7, for example, in the same period t 3 In the first excitation light source 1 is between 0 and t 3 Is lightened in a period of time; the second light source 2 is between 0 and t 3 Is lightened in a period of time; at this time, the laser light source system is between 0 and t 3 White light is output during the period of time. By providing the first excitation light source 1 and the second light source 2 to be respectively lighted for the whole period in the same period, white light continuously output in the same period can be obtained. The embodiment of the invention also provides laser projection equipment which comprises a light machine, a lens and the laser light source system. The laser light source system is used for providing a light source beam for the optical machine, the optical machine is used for modulating the light source beam and outputting the light source beam to the lens, and the lens is used for imaging and projecting the light source beam to the projection medium to form a projection picture.
In summary, in the laser light source system and the laser projection device provided by the embodiments of the present invention, the first blue light 11 emitted by the first excitation light source 1 passes through the wavelength conversion device 5 to generate the yellow stimulated emission light 51, and the yellow stimulated emission light 51 is combined with the second blue light 21 emitted by the second light source 2, so as to form white light output. Compared with the scheme of obtaining white light output by mixing colors by using laser light sources with red, green and blue colors, the embodiment of the invention can obtain white light output by only adopting two groups of blue excitation light sources, and has the advantages of simple integral structure, lower cost and high light emitting efficiency because the blue excitation light sources have lower cost and higher electro-optic conversion efficiency compared with the red and green excitation light sources.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting thereof; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and they should be included in the protection scope of the present invention.

Claims (11)

1. A laser light source system, comprising: the device comprises a first excitation light source, a second light source, a first light homogenizing element, a second light homogenizing element, a wavelength conversion device and a light splitting and combining device;
the first excitation light source emits first blue light, and the second light source emits second blue light;
the first light homogenizing element is arranged between the first excitation light source and the light splitting and combining device, and the second light homogenizing element is arranged between the second light source and the light splitting and combining device;
the wavelength conversion device comprises a fluorescent layer and a substrate with a reflecting surface, wherein the fluorescent layer is arranged on the reflecting surface of the substrate, or the wavelength conversion device comprises the fluorescent layer, the substrate and the reflecting layer, and the reflecting layer is positioned between the substrate and the fluorescent layer;
the light splitting and combining device reflects first blue light emitted by the first excitation light source to the fluorescent layer, and the fluorescent layer receives the first blue light emitted by the first excitation light source and converts wavelength to obtain yellow excited light;
the light splitting and combining device transmits the yellow stimulated luminescence and reflects the second blue light, and outputs the yellow stimulated luminescence and the second blue light after combining;
the thickness of the fluorescent layer is less than or equal to 0.3mm;
the laser light source system further comprises a first scattering element, wherein the first scattering element is arranged between the first excitation light source and the first light homogenizing element, and the first scattering element is used for scattering and homogenizing first blue light emitted by the first excitation light source; the laser light source system further comprises a second scattering element, wherein the second scattering element is arranged between the second light source and the second light homogenizing element, and the second scattering element is used for scattering and homogenizing the second blue light emitted by the second light source.
2. A laser light source system, comprising: the device comprises a first excitation light source, a second light source, a first light homogenizing element, a second light homogenizing element, a wavelength conversion device and a light splitting and combining device;
the first excitation light source emits first blue light, and the second light source emits second blue light;
the first light homogenizing element is arranged between the first excitation light source and the light splitting and combining device, and the second light homogenizing element is arranged between the second light source and the light splitting and combining device;
the wavelength conversion device comprises a fluorescent layer and a substrate with a reflecting surface, wherein the fluorescent layer is arranged on the reflecting surface of the substrate, or the wavelength conversion device comprises the fluorescent layer, the substrate and the reflecting layer, and the reflecting layer is positioned between the substrate and the fluorescent layer;
the light splitting and combining device transmits first blue light emitted by the first excitation light source to the fluorescent layer, and the fluorescent layer receives the first blue light emitted by the first excitation light source and converts wavelength to obtain yellow excited light;
the light splitting and combining device reflects the yellow stimulated luminescence and transmits the second blue light, and outputs the yellow stimulated luminescence and the second blue light after combining;
the thickness of the fluorescent layer is less than or equal to 0.3mm;
the laser light source system further comprises a first scattering element, wherein the first scattering element is arranged between the first excitation light source and the first light homogenizing element, and the first scattering element is used for scattering and homogenizing first blue light emitted by the first excitation light source; the laser light source system further comprises a second scattering element, wherein the second scattering element is arranged between the second light source and the second light homogenizing element, and the second scattering element is used for scattering and homogenizing the second blue light emitted by the second light source.
3. The laser light source system of claim 1, further comprising a first mirror and a first lens group, the first mirror and the first lens group being disposed in sequence between the first excitation light source and the light splitting and combining device.
4. The laser light source system according to claim 1 or 2, further comprising a second mirror and a second lens group, the second mirror and the second lens group being disposed in order between the second light source and the light splitting and combining device.
5. The laser light source system according to claim 1 or 2, wherein the first excitation light source comprises a first blue laser array, a second blue laser array, and a polarization combining element; the planes of the first blue light laser array and the second blue light laser array are perpendicular to each other, the polarization light combining element is positioned between the first blue light laser array and the second blue light laser array, and the polarization light combining element is intersected with the planes of the first blue light laser array and the second blue light laser array; the polarization states of the light emitted by the first blue light exciter array and the light emitted by the second blue light exciter array are different, and the polarization light combining element performs light combining output on the light emitted by the first blue light laser array and the light emitted by the second blue light laser array to obtain the first blue light.
6. The laser light source system according to claim 1 or 2, further comprising a third lens group disposed between the light splitting and combining device and the wavelength conversion device.
7. The laser light source system according to claim 6, wherein the wavelength conversion device is provided in a closed housing, the housing is provided with a light-passing opening, and the third lens group is provided in the light-passing opening of the housing.
8. The laser light source system according to claim 1 or 2, wherein the wavelength conversion means is arranged on the optical path of the first blue light, movable relative to each other.
9. The laser light source system according to claim 1 or 2, wherein the lighting periods of the first excitation light source and the second light source coincide in the same period.
10. The laser light source system according to claim 1 or 2, wherein the first excitation light source lights up for a whole period and the second light source lights up for a partial period or a whole period within the same period.
11. A laser projection device comprising a light engine, a lens and a laser light source system according to any one of claims 1 to 10, wherein the laser light source system is configured to provide a light source beam for the light engine, the light engine is configured to modulate the light source beam and output the modulated light source beam to the lens, and the lens is configured to image and project the modulated light source beam onto a projection medium to form a projection screen.
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