WO2022012345A1 - Système de source de lumière et système de projection - Google Patents

Système de source de lumière et système de projection Download PDF

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Publication number
WO2022012345A1
WO2022012345A1 PCT/CN2021/104002 CN2021104002W WO2022012345A1 WO 2022012345 A1 WO2022012345 A1 WO 2022012345A1 CN 2021104002 W CN2021104002 W CN 2021104002W WO 2022012345 A1 WO2022012345 A1 WO 2022012345A1
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WO
WIPO (PCT)
Prior art keywords
light
light source
excitation
source system
excitation light
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PCT/CN2021/104002
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English (en)
Chinese (zh)
Inventor
郭祖强
杜鹏
瞿玉丽
李屹
Original Assignee
深圳光峰科技股份有限公司
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Publication of WO2022012345A1 publication Critical patent/WO2022012345A1/fr

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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
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/206—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
    • G03B21/2073—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

Definitions

  • the present application relates to the technical field of projection, and in particular, to a light source system and a projection system.
  • Projection light source is an indispensable part of projection.
  • people's design requirements for projection light source are also increasing; Fluorescence is generated, and another blue laser is mixed with fluorescence to generate white light, but this scheme loses the unexcited blue laser, and white light can only be obtained by adding blue laser alone, with large energy loss and low light efficiency.
  • the blue laser added separately increases the volume and cost of the entire system; in addition, in the projection light source, the dichroic plate is usually placed in the center of the incident light path and the outgoing light path, and the dichroic plate covers the entire fluorescent spot and is larger in size.
  • volume compatibility is one of the important factors affecting the compatible platform, so how to reduce the volume of the projection light source and improve the efficiency of the projection light source is an urgent problem to be solved.
  • the present application provides a light source system and a projection system, which can reduce the overall volume of the light source system and improve the light extraction efficiency of the light source.
  • the technical solution adopted in the present application is to provide a light source system
  • the light source system includes: a light-emitting component, a light-guiding element, a collecting lens component and a wavelength conversion device, and the light-emitting component is used to generate excitation light;
  • the light-guiding element It is arranged on the transmission light path of the excitation light emitted by the light-emitting component, and forms a certain angle with the transmission direction of the excitation light, and is used to guide and control the transmission direction of the excitation light;
  • the excitation light emitted after being guided by the light guiding element is collected, wherein the center line of the collection lens assembly and the transmission direction of the excitation light emitted after being guided by the light guiding element have a preset inclination angle, so that after being guided by the light guiding element, there is a preset inclination angle.
  • the outgoing excitation light is incident from the edge of the collecting lens assembly;
  • the wavelength conversion device is arranged on the outgoing light path of the collecting lens assembly, and is used to receive the excitation light to generate the corresponding received laser light, and combine the received laser light and the unexcited excitation light together Reflected to the collection lens assembly;
  • the light guide element includes a reflection area and a transmission area respectively located on opposite sides of the reflection area, and the area of the reflection area is larger than the size of the spot formed on the light guide element by the excitation light emitted by the light-emitting assembly, using It is used to reflect the excitation light and transmit the received laser light, and the transmission area is used to transmit the excitation light and the received laser light, and the received laser light and the unexcited excitation light synthesize white light.
  • the light source system includes a light-emitting assembly, a light-guiding element, a collecting lens assembly, and a wavelength conversion device
  • the excitation light emitted by the light-emitting assembly is reflected by the light-guiding element to reach the wavelength conversion device, and the excitation light can be
  • the wavelength conversion material on the wavelength conversion device is excited to generate laser light, and the laser light and the unexcited excitation light can be collected by the collection lens assembly and emitted through the light guide element; It does not coincide with the center line of the collection lens assembly, so that the excitation light can enter the edge of the collection lens assembly, and then converge on the wavelength conversion device through the collection lens assembly.
  • the reduced area helps reduce the loss caused by the excitation light passing through the reflection area, improves the efficiency of the excitation light output, thereby improving the luminous efficiency of the light source, and because the laser and the unexcited excitation light are used to synthesize white light, there is no need to add blue light.
  • the light source can reduce the overall volume and cost of the system.
  • the included angle between the light guide element and the horizontal direction is 40° ⁇ 50°.
  • the thickness of the transmission area is less than or equal to the thickness of the reflection area, the reflection area is used to reflect the first light beam and transmit the second light beam, and the transmission area is provided with an anti-reflection film;
  • the first light beam includes blue light
  • the second light beam includes yellow light, green light or red light.
  • the transmittance of the light incident on the transmissive region can be improved, which helps to reduce the loss of light and improve the luminous efficiency.
  • the light directing element has a chamfered plane that is parallel to the centerline of the collection lens assembly.
  • the transmittance of the light incident on the side of the light guide element can be improved, which contributes to reducing the loss of light and improving the luminous efficiency.
  • the excitation light is polarized light
  • a polarizing film is provided in the reflection area, and the polarizing film is used to transmit S-polarized light and reflect P-polarized light.
  • the light source system further includes a first homogenizing device and a second homogenizing device, and the first homogenizing device is arranged on the outgoing light path of the collecting lens assembly, and is used to compare the laser light and the unexcited excitation light. Perform homogenizing treatment; the second homogenizing device is arranged on the outgoing light path of the light-emitting component, and is used for homogenizing the excitation light, and injecting the homogenized excitation light into the light guiding element.
  • the incident light can be homogenized, so that the generated light source beam is relatively uniform.
  • the light source system further includes a first relay lens, the first relay lens is disposed on the outgoing light path of the collection lens assembly, and is used for receiving the laser light and the unexcited excitation light emitted by the collection lens assembly, After being collected, it is input to the first uniform light device.
  • the first relay lens is disposed on the outgoing light path of the collection lens assembly, and is used for receiving the laser light and the unexcited excitation light emitted by the collection lens assembly, After being collected, it is input to the first uniform light device.
  • the laser light and the unexcited excitation light can be converged, so that more light is incident on the first light homogenizing device and light loss is reduced.
  • the light source system further includes:
  • a first focusing lens arranged on the outgoing light path of the light-emitting component, used for focusing the excitation light and inputting it to the second homogenizing device;
  • a reflecting device which is arranged on the outgoing light path of the second homogenizing device, and is used for reflecting the homogenized excitation light emitted by the second homogenizing device;
  • the second relay lens is arranged on the outgoing light path of the reflection device, and is used for condensing the excitation light reflected by the reflection device and inputting it to the light guiding element.
  • the excitation light can be concentrated, so that more light can be incident on the second uniform light device to reduce light loss; by setting the reflective device, the direction of the incident light can be adjusted, which can reduce the volume of the system;
  • the two relay lenses can condense the light emitted from the reflective device, so that more light is incident on the light guiding element and the light loss is reduced.
  • the light source system further includes a second focusing lens, the second focusing lens is disposed on the outgoing light path of the second relay lens, and is used for focusing the light emitted by the second relay lens and inputting the light to the light source. guide element.
  • the second focusing lens By arranging the second focusing lens, the light emitted from the second relay lens can be converged, so that more light is incident on the light guide element and light loss is reduced.
  • the collecting lens assembly includes a first collecting lens and a second collecting lens, the first collecting lens is disposed on the outgoing light path of the light guide element, and the second collecting lens is disposed on the outgoing light path of the first collecting lens.
  • the light emitted from the light guiding element can be converged, so that more excitation light is incident to the wavelength conversion device, reducing light loss, and the light emitted from the wavelength conversion device can be converged to reduce fluorescence and Loss of unexcited excitation light.
  • the size of the first collecting lens is larger than that of the second collecting lens, the first collecting lens and the second collecting lens are plano-convex lenses or meniscus lenses, and the center line of the first collecting lens and the second collecting lens are Centerlines coincide.
  • the technical solution adopted in this application is to provide a projection system, the projection system includes a light source system and an optomechanical system, the optomechanical system is used to generate light beams of the light source, and the optomechanical system is arranged on the optical path of the light source, with The light source beam is processed to form projection light, wherein the projection system is the above-mentioned light source system.
  • FIG. 1 is a schematic structural diagram of a light source system
  • FIG. 2 is a schematic structural diagram of a first embodiment of a light source system provided by the present application.
  • FIG. 3 is a schematic structural diagram of a light guide element in the embodiment shown in FIG. 2;
  • FIG. 4(a)-FIG. 4(d) are schematic diagrams of various structures of the wavelength conversion device in the embodiment shown in FIG. 2;
  • FIG. 5 is a schematic structural diagram of a second embodiment of a light source system provided by the present application.
  • FIG. 6 is a schematic structural diagram of a third embodiment of a light source system provided by the present application.
  • FIG. 7 is a schematic structural diagram of a fourth embodiment of a light source system provided by the present application.
  • FIG. 8 is a schematic structural diagram of a fifth embodiment of a light source system provided by the present application.
  • FIG. 9(a)-FIG. 9(c) are various schematic diagrams of the dichroic plate and the incident light beam in the embodiment shown in FIG. 7;
  • FIG. 10 is a schematic structural diagram of a sixth embodiment of a light source system provided by the present application.
  • FIG. 11 is a schematic structural diagram of a seventh embodiment of a light source system provided by the present application.
  • FIG. 12 is a schematic structural diagram of an embodiment of a projection system provided by the present application.
  • the existing projection light source As shown in FIG. 1 , after the blue laser light emitted by the blue laser 101 is homogenized by the homogenizing component 102, it is reflected in the central area of the dichroic plate 103, and then collected by the collection lens groups 104-105. On the fluorescence wheel 106 , the fluorescence excited by the fluorescence wheel 106 is collected by the collection lens group 104 - 105 , transmitted by the dichroic plate 103 , converged by the light-emitting lens 107 , and reflected by the reflecting mirror 110 , and finally transmitted by the light-emitting relay lens 111 .
  • the blue laser generated by another blue laser 108 is converged to the central area of the dichroic plate 103 through the focusing mirror 109, and reflected in the central area of the dichroic plate 103, reaching the light-emitting lens 107 , and then reflected by the reflector 110 , and finally converged by the light output relay lenses 111 - 112 into the projector system 113 .
  • the dichroic plate 103 is placed in the center of the incident light path and the outgoing light path, and the size of the dichroic plate 103 can cover the entire beam aperture, and the structure is simple, but the size of the dichroic plate 103 is large and takes up space
  • the distance between the homogenizing component 102 and the dichroic plate 103, the collecting lens group 104 and the light-emitting lens 107 is long, and the optical path is long, which not only increases the volume of the entire optical path, but also causes the dilution of the etendue
  • white light is generated by fluorescence and the separately added blue laser 108 in the entire optical path, the unexcited blue laser on the fluorescence wheel 106 is not used, and the light efficiency is low, and the newly added blue laser 108 does not increase the system. It also increases the volume of the optical path, so it is necessary to design a light source system that does not increase the cost and volume of the system and has high efficiency.
  • FIG. 2 is a schematic structural diagram of a first embodiment of a light source system provided by the present application.
  • the light source system includes: a light emitting assembly 11 , a light guiding element 12 , a collecting lens assembly 13 and a wavelength conversion device 14 .
  • the light-emitting component 11 is used to generate excitation light, which may include at least one laser, such as a blue laser, which can generate blue laser light.
  • excitation light which may include at least one laser, such as a blue laser, which can generate blue laser light.
  • the blue laser light generated by the blue laser has a wavelength of 455 nm.
  • the light guide element 12 is arranged on the transmission light path of the excitation light emitted by the light-emitting component 11, and the light guide element 12 is placed at a certain angle with the transmission direction of the excitation light, which is used to guide and control the transmission direction of the excitation light; that is, the light
  • the guide element 12 can receive the excitation light emitted by the light-emitting component 11 and reflect the excitation light to the subsequent optical elements in the optical path.
  • the light guide element 12 adopts a dichroic film or a regional film.
  • the light guide element 12 includes a reflection area 121 and a transmission area 122 respectively located on opposite sides of the reflection area 121 .
  • the area of the reflection area 121 is slightly larger than the excitation light emitted by the light-emitting component 11 .
  • the size of the light spot formed on the light guide element 12 is used to reflect the excitation light and transmit the received laser light.
  • the reflection area is coated with a film to achieve the reflection function, and a reflection sheet can also be provided to achieve its reflection function; transmission;
  • the thickness of the region 122 can be less than or equal to the thickness of the reflective region 121, which is used to maximize the transmission of the excitation light and the received laser light.
  • an anti-reflection coating can be further arranged on the transmission region 122, so that the excitation light and the received laser light can pass through as much as possible.
  • the transmission area 122 is also used to provide a clamping part so that the light guide element 12 can work normally. Therefore, it can be as small as possible. Ideally, the transmission area 122 may not be provided, so that the The excitation light and the received laser light can enter the subsequent optical system completely without loss.
  • the collection lens assembly 13 is arranged on the outgoing light path of the light guide element 12, and is used to collect the excitation light that is guided by the light guide element 12 and exits; specifically, the collection lens assembly 13 includes at least one collection lens, and the number of the collection lenses can be determined according to The specific application scenario settings, for example, can be 1, 2 or 3; the collecting lens can be a plano-convex lens or a concave-convex lens, that is, the thickness of the two ends of the lens is less than the thickness of the center; the collecting lens can be made of high refractive index materials, such as , flint glass or lanthanum crown glass can be used.
  • the preset inclination angle can be an angle set according to experience, which can ensure that the excitation light emitted from the light guide element 12 can obliquely enter the collection lens assembly 13 is enough.
  • the wavelength conversion device 14 is arranged on the outgoing light path of the collecting lens assembly 13, and is used to receive the excitation light and generate the corresponding received laser light; specifically, the wavelength conversion device 14 can be a fluorescent wheel, which includes at least one wavelength conversion The region is provided with a wavelength converting substance, which can be fluorescent.
  • the wavelength conversion device 14 includes a wavelength conversion area, and the wavelength conversion area is a yellow light conversion area 141 .
  • the yellow light conversion area 141 is provided with a yellow fluorescent substance, and the yellow fluorescent substance can Under the excitation of light, yellow fluorescence is generated. Since only one yellow light conversion region 141 is provided, the fabrication process of the wavelength conversion device 14 is simple. In addition, the fluorescence conversion efficiency is high, and the yellow fluorescence and the unexcited excitation light can be used at the same time. By generating white light, the rainbow effect caused by the time-series method can be avoided.
  • an anti-reflection layer 142 can be provided in the wavelength conversion device 14 , and the anti-reflection layer 142 can improve the intensity of the unexcited blue light.
  • the ratio of the white light to be synthesized can make the uniformity of the synthesized white light higher.
  • the positional relationship between the anti-reflection layer 142 and the yellow light conversion area 141 can be set according to the specific application scene, and is not limited to the setting in the yellow light conversion area 141 as shown in FIG. 4(b).
  • the inner side of the yellow light conversion area 141 can be arranged on the outer side of the yellow light conversion area 141 or separated from the yellow light conversion area 141 by a certain distance.
  • the reflection enhancing layer 142 can be correspondingly set to a corresponding polarizing layer to increase the polarization of the unexcited polarized light. proportion.
  • the wavelength conversion device 14 includes two wavelength conversion regions, namely a green light conversion region 143 and a red light conversion region 144 , and the green light conversion region 143 is provided with green fluorescent light substance, which can generate green fluorescence under the excitation of excitation light; the red light conversion area 144 is provided with a red fluorescent substance, which can generate red fluorescence under the excitation of excitation light. It can adjust the ratio of the generated red fluorescence and green fluorescence, and can use red fluorescence, green fluorescence and unexcited excitation light to generate white light at the same time, which can avoid the rainbow effect caused by the use of sequential method to generate white light.
  • the green light conversion area 143 and the red light conversion area 144 are arranged in concentric rings, so that the excitation light can simultaneously illuminate the green fluorescent substance and the red fluorescent substance to generate green
  • the ratio of green fluorescence to red fluorescence can be controlled by setting the positions and sizes of the green light conversion region 143 and the red light conversion region 144.
  • the red light conversion region 144 can be set larger to increase the The proportion of red fluorescence, which in turn produces white light with better brightness and chromaticity.
  • red fluorescence and green fluorescence can be generated in time sequence, and the wavelength conversion device 14 can be rotated in a counterclockwise or clockwise direction, so that the green light conversion region 143 and the red light conversion region 144 are sequentially irradiated with excitation light , so as to generate the corresponding green fluorescence and red fluorescence. For example, it takes 2 seconds for the wavelength conversion device 14 to rotate once, then in the first second, the received laser light from the wavelength conversion device 14 is green fluorescence, and in the second second Within the time period, the received laser light emitted from the wavelength conversion device 14 is red fluorescent light.
  • the anti-reflection layer 142 or the polarizing layer as shown in FIG. 4( b ) can also be provided to improve the excitation that is not excited. proportion of light.
  • the excitation light emitted from the light-emitting component 11 can be reflected by the reflection area 121 to the collection lens component 13, and the collection lens component 13 collects the incident excitation light and transmits it to the wavelength conversion device 14.
  • the wavelength conversion on the wavelength conversion device 14 The substance is excited by the excitation light to generate the received laser light, which can be combined with the unexcited excitation light to form the outgoing light of the light source, and then exits through the collecting lens assembly 13 and the light guiding element 12 in sequence;
  • the excitation light in the wavelength conversion region may not be excited, but is reflected by the wavelength conversion device 14, and it can also pass through the transmission region 122 of the light guide element 12 after passing through the collecting lens assembly 13, so as to realize the use of the excitation light that is not excited and the excitation light. Synthesized white light by laser.
  • This embodiment provides a light source system, which is a projection light source device for laser-excited fluorescence.
  • the light source system includes a light-emitting component 11 , a light guide component 12 , a collection lens component 13 , and a wavelength conversion device 14 .
  • the excitation light emitted by the light-emitting component 11 After being reflected by the light guiding element 12, it reaches the wavelength conversion device 14 to excite the wavelength conversion material to generate laser light.
  • the laser light and the unexcited excitation light can be collected by the collecting lens assembly 13 and exit through the light guiding element 12;
  • the center position of the light guiding element 12 and the center of the collecting lens assembly 13 are not on the same line, but deviated from the center of the collecting lens assembly 13, so that the excitation light enters the edge of the collecting lens assembly 13, and passes through the collecting lens assembly 13.
  • this placement method reduces the design area of the light guide element 12, so that the area of the reflection area 121 is reduced, which helps to reduce the loss caused by the excitation light passing through the reflection area 121, and improves the excitation light.
  • the output efficiency is improved, thereby improving the luminous efficiency of the light source, and because the laser and the unexcited excitation light are used to synthesize white light, there is no need to add a blue light source, and the overall volume of the system can be reduced and the cost is low; the light guiding element in this embodiment
  • the size of 12 is small, only one-fifth of the existing solution, which reduces the cost of the light guide element 12; in addition, the projection system of this solution has a compact structure, can be adapted to a variety of projectors, and has stronger compatibility , can reduce the cost of the whole system.
  • FIG. 5 is a schematic structural diagram of a second embodiment of a light source system provided by the present application.
  • the light source system includes: a light-emitting component 201, a dichroic plate 202, a collection lens component 203, a wavelength conversion device 204, a second uniform light device 205 , a first relay lens 206 and a first uniform light device 207 .
  • the light-emitting component 201 can generate a blue laser, which can be a blue laser with a wavelength of 455 nm; the second light homogenizing device 205 is arranged on the outgoing light path of the light-emitting component 201, which can perform uniform light processing on the blue laser, and uniformize the uniform light.
  • the blue laser is injected into the dichroic plate 202, which can be a compound eye homogenizing system.
  • the compound eye homogenizing system can be set as close to the dichroic sheet 202 as possible.
  • the dichroic plate 202 is disposed on the outgoing light path of the second light homogenizing device 205, which can reflect the blue laser light to the collecting lens assembly 203.
  • the included angle between the dichroic sheet 202 and the horizontal direction is 40° ⁇ 50°. Taking FIG. 5 as an example, in this embodiment, the included angle between the dichroic sheet 202 and the horizontal left direction is 40° ° ⁇ 50, preferably, the angle is 45°.
  • the blue laser light generated by the light-emitting component 201 can be incident on the reflection area of the dichroic sheet 202 after being homogenized by the second homogenizing device 205, and the reflection area is used to reflect the first light beam and transmit the second light beam, and the first light beam includes blue light.
  • the second light beam includes yellow light, green light or red light; specifically, the reflection area is provided with an anti-blue-yellow-transmitting film layer, which can be used to reflect blue light and transmit yellow light, and the size of the reflection area can be incident to the surface of the dichroic plate 202
  • the size of the light spot depends on the size of the light spot; the transmission area is provided with an anti-reflection film, which can be a yellow transparent film layer, which can increase the transmission performance of yellow light; or the film layer set in the reflection area can reflect blue light and transmit red light and green light,
  • the transmission area is provided with an anti-reflection film, which can increase the transmission performance of red light and green light.
  • the collecting lens assembly 203 is disposed on the outgoing light path of the dichroic plate 202, which can collect the blue laser light reflected by the dichroic plate 202, and the direction of the blue laser light emitted from the dichroic plate 202 is the center line of the collecting lens assembly 203 There is a preset tilt angle between l, so that the blue laser light enters the edge of the collecting lens assembly 203; specifically, as shown in FIG. After the reflection area of the sheet 202 is reflected, it is incident from the edge of the collecting lens assembly 203 , and then converges on the wavelength conversion device 204 through the collecting lens assembly 203 .
  • the collecting lens assembly 203 includes a first collecting lens 2031 and a second collecting lens 2032.
  • the first collecting lens 2031 is disposed on the outgoing light path of the dichroic plate 202, and the second The collecting lens 2032 is disposed on the outgoing light path of the first collecting lens 2031 .
  • the first collecting lens 2031 and the second collecting lens 2032 can be made of a material with a higher refractive index.
  • the radius of curvature of the surface of 203 is smaller, the surface is more convex, and its edge thickness is larger than the center thickness, that is, the middle of the first collecting lens 2031 and the second collecting lens 2032 is thicker and the edge is thinner; the size of the first collecting lens 2031 Larger than the size of the second collecting lens 2032, the first collecting lens 2031 and the second collecting lens 2032 are plano-convex or meniscus lenses, and the center line l of the first collecting lens 2031 coincides with the center line l of the second collecting lens 2032.
  • the edge thickness of the collecting lens assembly 203 is thinner relative to the central thickness, and the transmission path of the light passing through the collecting lens assembly 203 is shorter, so the absorption of the blue laser light is less, Furthermore, without changing the shape of the collecting lens assembly 203, the reliability of the collecting lens assembly 203 is ensured, the energy loss of the incident blue laser light is reduced, and the utilization rate of the blue laser light is improved.
  • the wavelength conversion device 204 is disposed on the outgoing light path of the collection lens assembly 203, and can receive blue laser light and generate corresponding fluorescence.
  • the fluorescence emitted from the wavelength conversion device 204 and the unexcited blue laser light can simultaneously enter the second collection lens 2032 and the second collection lens 2032.
  • the first relay lens 206 is arranged on the outgoing optical path of the collecting lens assembly 203, and is used for receiving the fluorescence and the unexcited blue laser light emitted by the collecting lens assembly 203, and after converging the fluorescence and the unexcited blue laser, It is transmitted to the first dodging device 207 .
  • the first homogenizing device 207 is disposed on the outgoing light path of the collecting lens assembly 203, and is used for homogenizing the fluorescence and the unexcited blue laser light.
  • the first homogenizing device 207 may be a square rod.
  • the fluorescence is collected by the second collecting lens 2032 and the first collecting lens 2031 in sequence, and finally collected by the first relay lens 206 to the first light homogenizing device 207, and the unexcited blue laser light on the wavelength conversion device 204 is absorbed by the wavelength.
  • the conversion device 204 is scattered, and is also collected by the first collecting lens 2031 and the second collecting lens 2032 , and finally collected by the first relay lens 206 into the first uniform light device 207 .
  • the light beam emitted by the light source system can enter the optomechanical system 30 , and the optomechanical system 30 is disposed on the outgoing light path of the collecting lens assembly 203 , and is used for processing the light emitted by the collecting lens assembly 203 to form projection light , the projection light can be irradiated on the projection screen or the wall, so as to realize the projection display.
  • the fluorescence and the unexcited blue laser are simultaneously mixed to generate white light, that is, the unexcited blue laser and the fluorescence are simultaneously generated.
  • the edges of the first collecting lens 2031 and the second collecting lens 2032 enter, and the light spot collected by the collecting lens assembly 203 is located on the center line l of the collecting lens assembly 203.
  • the unexcited blue laser can be mixed with fluorescence to obtain white light, which improves the utilization rate of blue laser, does not need to add new blue light sources, and reduces the number of blue light sources;
  • blue laser Incident to the edge of the collecting lens assembly 203 the edge thickness of the collecting lens assembly 203 is thinner than the central thickness, so the transmittance of the blue laser is higher, and the power absorbed by the collecting lens assembly 203 is less, and the reliability is higher; furthermore, The light beam emitted by the second homogenizing device 205 has a certain divergence angle.
  • the blue laser light spot incident on the center of the dichroic plate 202 is smaller. , that is, the reflection area is smaller.
  • the unexcited blue laser light exits through the collection lens assembly 203 the probability of the unexcited blue laser light passing through the reflection area is reduced, and the loss is smaller, so that the unexcited blue laser light is relatively less than the two
  • the extraction efficiency to the color plate 202 is higher.
  • the unexcited blue laser and fluorescence can be mixed to obtain white light, and the blue light source and another light-emitting relay lens in the prior art are cancelled, which shortens the optical path and reduces the volume of the optical path.
  • the distance between the light-emitting lens and the collecting lens is relatively large, which leads to a longer optical path and increases the overall optical path.
  • the dichroic plate 202 is placed at the edge, and its size is small, which can reduce the volume of the entire optical path.
  • the blue light source and the corresponding optical devices are reduced, and the cost of the whole system is reduced; It is one-fifth of the size, which reduces the cost; in addition, the light source system of this embodiment has a compact structure, can be adapted to a variety of projectors, has stronger compatibility, and reduces the cost of the entire system.
  • FIG. 6 is a schematic structural diagram of a third embodiment of a light source system provided by the present application. The difference from the embodiment shown in FIG. 5 is that the first relay lens is not provided in this embodiment, and the first uniform
  • the optical device is a compound eye system 307, and the compound eye system 307 can be a single compound eye or a double compound eye.
  • the blue laser light emitted by the light-emitting component 201 is homogenized by the second homogenizing device 205, it is reflected by the reflection area of the dichroic plate 202 and enters the collecting lens assembly 203.
  • the fluorescence excited by the wavelength conversion device 204 is collected by the collecting lens assembly 203. , enters the compound eye system 307 for homogenization, and enters the optomechanical system 30 after homogenization.
  • the uniform light method of the fluorescence in this embodiment has changed. After the fluorescence and the blue laser light not excited by the wavelength conversion device 204 pass through the collection lens assembly 203 , they have a certain divergence angle. The greater the distance between the first collection lens 2031 and the compound eye system 307 is , the light beam reaching the surface of the compound eye system 307 is larger, but the angle remains unchanged.
  • the etendue of the light beam after passing through the compound eye system 307 mainly depends on the aperture of the light beam entering the compound eye system 307 .
  • the etendue is introduced.
  • the etendue is used to describe the geometric characteristics of a beam with a certain aperture angle and cross-sectional area. Its calculation formula is as follows:
  • E is the etendue
  • n is the refractive index
  • A is the area of the beam aperture
  • ⁇ is the beam divergence angle
  • the etendue maintenance rate represents the maintenance efficiency of an optical element to the etendue under ideal conditions, that is, it is used to measure the degree of its deviation from the initial etendue.
  • the formula for calculating the expansion maintenance rate is as follows:
  • E 0 is the initial etendue
  • E 1 is the current etendue
  • FIG. 7 is a schematic structural diagram of a fourth embodiment of the light source system provided by the present application. The difference from the embodiment shown in FIG. 5 is: It also includes: a first focusing lens 409, a reflection device 410 and a second relay lens 411, and the placement of some elements is different, so that the structure of the overall optical path is different.
  • the first focusing lens 409 is disposed on the outgoing light path of the light-emitting component 201 , and is used to focus the blue laser light and input it to the square rod 405 .
  • the reflective device 410 is disposed on the outgoing light path of the square rod 405 , and is used for refraction and reflection of the uniform blue laser light emitted by the square rod 405 , and can be a mirror.
  • the second relay lens 411 is disposed on the outgoing light path of the reflection device 410 , and is used for condensing the blue laser light reflected by the reflection device 410 and inputting it to the dichroic plate 202 .
  • the blue laser light emitted by the light-emitting component 201 is converged by the first focusing lens 409 and enters the square rod 405 for uniform light. After the uniform light is reflected by the reflective device 410, the blue laser light is collimated by the second relay lens 411 and then enters the dichroic plate 202.
  • the subsequent optical path It is the same as the embodiment shown in FIG. 5 and will not be repeated here.
  • This embodiment is not only applicable to the compound eye homogenization system, but also to the square rod homogenization system.
  • the placement of the dichroic plate 202 shortens the distance between the second relay lens 411 and the dichroic plate 202 and reduces the The size of the reflection area of the dichroic plate 202 is increased, and the output efficiency of the blue laser is improved; in addition, since the light-emitting component 201, the first focusing lens 409, the square rod 405 and the reflecting device 410 are arranged in the vertical direction, the horizontal direction can be shortened. The length of the direction can reduce the overall volume of the system.
  • FIG. 8 is a schematic structural diagram of a fifth embodiment of a light source system provided by the present application.
  • the dichroic plate 502 in this embodiment has an oblique cut surface, and the oblique surface is The cut plane is parallel to the centerline of the collection lens assembly 203 .
  • the side S of the dichroic plate 502 when the side S of the dichroic plate 502 is rectangular, after the fluorescent and blue laser light is emitted from the collecting lens assembly 203, part of the light beams can reach the side of the dichroic plate 502 and cannot be transmitted normally , causing part of the energy loss; and in this embodiment, the side of the dichroic sheet 502 is cut.
  • the side S is a parallelogram, as shown in Figure 9(b), at this time, the beam does not pass through when it exits. On the side, it can be directly transmitted on the surface of the dichroic plate 502, which reduces the light loss of fluorescence and unexcited blue laser light, and can improve the efficiency of the light source.
  • the oblique plane and the center line of the collecting lens assembly 203 may be parallel or non-parallel.
  • the transmission area may be as shown in FIG. 9(c).
  • the dichroic plate 502 with this structure Not only does it not block the light, but it can also reduce the length of the transmitted light, further reducing light loss.
  • FIG. 10 is a schematic structural diagram of a sixth embodiment of the light source system provided by the present application. The difference from the embodiment shown in FIG. 7 is that the light source system in this embodiment further includes a second focusing lens 612 .
  • the second focusing lens 612 is disposed on the outgoing light path of the second relay lens 411 , and is used for focusing the light emitted by the second relay lens 411 and inputting the light to the dichroic plate 202 , and the dichroic plate 202 is located at the outgoing light path pupil position.
  • the light beam after the light beam emerges from the square rod 405 , the light beam is divergent after passing through the second relay lens 411 .
  • the size of the outgoing light spot is large, which leads to a large reflection area of the dichroic sheet 202, which causes a large loss of blue laser light outgoing.
  • the area of the reflection area in the dichroic plate 202 can be reduced.
  • a second focusing lens 612 can be added, so that the light beams are converged after passing through the second relay lens 411 and the second focusing lens 612.
  • the beam aperture is gradually reduced, and the dichroic plate 202 is placed at the smallest position of the beam convergence aperture (ie, the exit pupil position).
  • the laser light loss is the lowest.
  • FIG. 11 is a schematic structural diagram of a seventh embodiment of a light source system provided by the present application.
  • the blue laser is polarized light
  • the polarized light includes S polarization.
  • the reflection area of the dichroic plate 702 is provided with a polarizing film, which is used to transmit S-polarized light and reflect P-polarized light.
  • the light beam incident on the reflection area of the dichroic plate 702 is S-polarized light, and the P-polarized light is reflected by the reflection area, and then converges on the wavelength conversion device 204 through the first collection lens 2031 and the second collection lens 2032, and the wavelength conversion device
  • the fluorescence excited by 204 and the unexcited blue laser have no polarization characteristics. After the fluorescence and the unexcited blue laser are collected by the collecting lens assembly 203, they reach the dichroic plate 702, and the fluorescence can pass through the dichroic plate 702 directly. However, half of the blue laser light (ie, the S polarized light) in the unexcited blue laser light can be transmitted from the reflection area, and finally enter the optical-mechanical system 30 .
  • the loss of blue laser light is about 14%, While the loss of blue laser light caused by the use of polarizing film is about 8.5%, the loss of blue laser light caused by non-polarizing film is 1.6 times that of blue laser light caused by polarizing film; The light loss of the laser improves the efficiency of the system.
  • FIG. 12 is a schematic structural diagram of an embodiment of a projection system provided by the present application.
  • the projection system 80 includes a light source system 81 and an optomechanical system 82.
  • the optomechanical system 81 is used to generate a light source beam, and the optomechanical system 82 is arranged at The light path of the light source is used to process the light beam of the light source to form projection light, wherein the projection system 81 is the above-mentioned light source system.
  • the present application provides a design solution for placing the dichroic plate on the edge.
  • the dichroic plate By placing the dichroic plate on the edge of the collecting lens assembly, the blue laser light enters from the edge of the collecting lens assembly.
  • This placement method The distance between the collection lens assembly and the first relay lens is reduced, the volume of the entire light source is reduced, the volume compatibility is stronger, and the cost of the entire light source is greatly reduced; Coating in the reflective area can achieve high-efficiency emission of fluorescence and blue laser light, and the area of the reflective area is small, which can reduce the loss of unexcited blue laser light passing through the reflective area; S-polarized light can pass through the reflection area, which can further improve the light extraction efficiency of the blue laser; in addition, the side of the dichroic plate can be processed to make it have an oblique surface to avoid the light beam passing through the side of the dichroic plate. loss, and further improve the efficiency of the light source.

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

Abstract

La présente invention concerne un système de source de lumière et un système de projection. Un ensemble d'émission de lumière (11) situé dans le système de source de lumière est utilisé pour générer une lumière d'excitation ; un élément de guidage de lumière (12) est utilisé pour guider et commander la direction de transmission de la lumière d'excitation ; un ensemble lentille de collecte (13) est utilisé pour collecter la lumière d'excitation, et il y a un angle d'inclinaison prédéfini entre une ligne centrale de l'ensemble lentille de collecte (13) et la direction de transmission de la lumière d'excitation, de telle sorte que la lumière d'excitation est incidente à partir du bord de l'ensemble lentille de collecte (13) ; un dispositif de conversion de longueur d'onde (14) est utilisé pour recevoir la lumière d'excitation et générer une lumière stimulée correspondante, et pour réfléchir conjointement la lumière stimulée ainsi que la lumière d'excitation non excitée vers l'ensemble lentille de collecte (13) ; l'élément de guidage de lumière (12) comprend une région de réflexion (121) et une région de transmission (122) ; la superficie de la région de réflexion (121) est supérieure à la taille d'un point formé par la lumière d'excitation sur l'élément de guidage de lumière (12), et la région de réflexion (121) est utilisée pour réfléchir la lumière d'excitation et transmettre la lumière stimulée ; la région de transmission (122) est utilisée pour transmettre la lumière d'excitation et la lumière stimulée ; et la lumière stimulée et la lumière d'excitation non excitée sont combinées en une lumière blanche. Le volume global du système de source de lumière peut être réduit, et l'efficacité de sortie de lumière d'une source de lumière peut être augmentée.
PCT/CN2021/104002 2020-07-15 2021-07-01 Système de source de lumière et système de projection WO2022012345A1 (fr)

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