WO2019010961A1 - 光源系统及投影设备 - Google Patents

光源系统及投影设备 Download PDF

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Publication number
WO2019010961A1
WO2019010961A1 PCT/CN2018/074752 CN2018074752W WO2019010961A1 WO 2019010961 A1 WO2019010961 A1 WO 2019010961A1 CN 2018074752 W CN2018074752 W CN 2018074752W WO 2019010961 A1 WO2019010961 A1 WO 2019010961A1
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Prior art keywords
light
wavelength conversion
conversion device
excitation light
laser
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English (en)
French (fr)
Inventor
周萌
田梓峰
许颜正
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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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
    • 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

Definitions

  • the utility model relates to the field of optical technology, in particular to a field of projection display.
  • the projection display is applied to all aspects of life, and the core part is the air source system.
  • LED light sources have high energy conversion efficiency and long life, which is a cold light source, but the optical power density of a single LED is low.
  • High-brightness LED technology achieves high-power-density light by combining multiple LEDs by combining the illumination of multiple LEDs.
  • the combination of multiple LEDs causes an increase in the volume of the light source, and at the same time brings about a problem of an increase in the volume of the heat dissipating component, resulting in a low power density of the outgoing light per unit volume of the light source.
  • the LD (Laser Diode) source is the same as the LED source, but the optical power density of a single LD is much higher than the optical power density of the LED.
  • the prior art typically uses a laser-excited phosphor technique that illuminates a yellow phosphor with a blue LD to obtain white light.
  • Phosphors are generally encapsulated in silica gel or glass powder, but the high temperature resistance of silica gel and glass encapsulation solutions needs to be improved.
  • YAG single crystal and transparent YAG ceramics have strong thermal conductivity and mechanical strength, which are suitable for high power white light illumination. .
  • the LD light source is a coherent light source, and the laser is a Lambertian light, and it is difficult to achieve uniform white light.
  • the technical problem mainly solved by the utility model is to provide a light source system and a projection device, which can realize white light illumination with high power and high uniformity and has a good user experience.
  • a technical solution adopted by the present invention is to provide a light source system, which includes:
  • a laser for emitting blue excitation light having a wavelength of 460 to 480 nm
  • wavelength conversion device on the optical path of the laser, wherein the blue excitation light is converted into a yellow laser light by the wavelength conversion device, and the wavelength conversion device is a transparent YAG:Ce3+ ceramic or YAG:Ce3+ single crystal;
  • the wavelength conversion device includes an incident surface for exciting incident light and an exit surface for emitting laser light, and the incident surface is provided to increase mixing of the excitation light and the laser light in the wavelength conversion device a functional layer having a function of enhancing transmission of the excitation light into the wavelength conversion device, diffusing transmission of the excitation light function, transmitting the excitation light, and reflecting the laser-receiving function or transmitting a small-angle excitation light And reflecting at least one of the high angle excitation light and all of the laser function.
  • the functional layer is a roughened diffuse transmission layer for enhancing the excitation light diffuse transmission function.
  • the functional layer is an anti-reflection film disposed on the incident surface for enhancing transmission of the excitation light into the wavelength conversion device and for reflecting large-angle excitation light and transmitting light through a small angle.
  • the permeable membrane is an anti-reflection film disposed on the incident surface for enhancing transmission of the excitation light into the wavelength conversion device and for reflecting large-angle excitation light and transmitting light through a small angle.
  • the functional layer further includes an anti-reflection film disposed on the diffuse transmission layer for enhancing transmission of the excitation light into the wavelength conversion device and a transmissive device disposed on the anti-reflection film The excitation light reflects the selective transmission of the laser light through the film.
  • the exit surface is provided with an antireflection film for enhancing transmission of the laser light and the excitation light.
  • the wavelength conversion device is a polyhedral structure, and a reflective film is disposed on the other surfaces than the incident surface and the exit surface to control the direction in which the laser light is emitted.
  • the incident surface is disposed adjacent to the exit surface.
  • a light-diffusing device for forming the excitation light to form a uniform spot on the incident surface of the wavelength conversion device is further disposed between the laser and the wavelength conversion device, and the wavelength conversion device further includes a glass sheet on the optical path between the light-sharing device and the diffuse transmission layer, and a side of the glass sheet adjacent to the excitation light is provided with an anti-reflection for enhancing transmission of the excitation light into the wavelength conversion device
  • the film, adjacent to the wavelength conversion device is provided with a selective transmission film that transmits the laser light by transmitting the excitation light.
  • the wavelength conversion device is provided with a heat conductive substrate on at least one surface other than the incident surface and the exit surface.
  • another technical solution adopted by the present invention is to provide a projection device including the light source system of any of the foregoing.
  • the utility model has the beneficial effects that the present invention provides a light source system and a projection device using the same, which is provided on the incident surface of the wavelength conversion device to increase the excitation light and the a functional layer that is subjected to a mixing probability of the laser in the wavelength conversion device, by transmitting enhanced excitation light into the wavelength conversion device, diffusing the excitation light into the wavelength conversion device, transmitting the excitation light to the incident surface of the wavelength conversion device, and reflecting the laser light,
  • the incident surface of the wavelength conversion device is transmitted through the small-angle excitation light and reflects the large-angle excitation light and all the laser light, so that the excitation light can be mixed with the laser light in the wavelength conversion device as much as possible, thereby achieving uniform white light emission, by selecting 460 ⁇ 480
  • the blue laser of nm finally achieves high power and high uniformity of the light source and has a good user experience.
  • FIG. 1 is a schematic structural view of a first embodiment of a light source system of the present invention
  • FIG. 2 is a schematic structural view of a second embodiment of the light source system of the present invention.
  • FIG. 3 is a schematic structural view of a third embodiment of the light source system of the present invention.
  • FIG. 4 is a schematic structural view of a fourth embodiment of the light source system of the present invention.
  • FIG. 5 is a schematic structural view of a fifth embodiment of the light source system of the present invention.
  • FIG. 6 is a schematic structural view of a sixth and fifth embodiment of the light source system of the present invention.
  • the technical problem mainly solved by the utility model is to provide a light source system and a projection device, which can realize white light illumination with high power and high uniformity and has a good user experience.
  • FIG. 1 is a schematic structural diagram of a light source system according to a first embodiment of the present invention.
  • the light source system of the present embodiment includes a laser 1, a light homogenizing device 2, a wavelength conversion device 3, and a thermally conductive substrate 4.
  • the laser 1 may be any one of a solid laser, a gas laser, and a semiconductor laser.
  • a semiconductor laser that is, an LD light source (Laser Diode laser diode) is used for emitting excitation light, in the present invention.
  • the laser 1 is a blue laser that emits blue excitation light.
  • the light homogenizing device 2 is a compound eye, which may be a single compound eye or a double compound eye group, or a double compound eye group, for causing the excitation light to pass through the light homogenizing device 2 to form a uniform spot on the incident surface of the wavelength conversion device, specifically in the present embodiment. In the way, a uniform rectangular spot is formed.
  • the wavelength conversion device 3 is a transparent YAG:Ce3+ ceramic or YAG:Ce3+ single crystal, and includes an incident surface 3-1 for exciting light incident and an exit surface 3-2 for emitting laser light.
  • the blue excitation light is incident on the wavelength conversion device through the homogenizing device 2, and is converted into a yellow laser light by the wavelength conversion device 3, and the excitation light that is not absorbed and converted and the laser light converted by the wavelength conversion device realize white light emission.
  • the excitation light of 460 ⁇ 480 nm blue is selected, the beam divergence angle of the excitation light is small, the collimation is strong, the efficiency of the excitation light coupling into the wavelength conversion device is high, and the volume of the wavelength conversion body is relatively high. Small, can achieve high power density white light illumination. Due to 445 The nm blue laser has great damage to the human eye. From the perspective of safety, the excitation light of 460 ⁇ 480 nm is more suitable for white light illumination.
  • the excitation light of 460 ⁇ 480 nm wavelength range excites YAG:Ce single crystal or transparent YAG:Ce ceramic, and its quantum efficiency has almost no change, and YAG:Ce single crystal or transparent YAG:Ce ceramic is in the range of 460 ⁇ 480 nm.
  • Absorption is weaker than 445 ⁇ 460 nm
  • the laser-excited YAG:Ce single crystal or transparent YAG:Ce ceramic in the 460 ⁇ 480 nm wavelength range produces a weaker light saturation effect, enabling high power density white light illumination.
  • the incident surface 3-1 includes a functional layer for increasing the mixing probability of the excitation light and the laser light in the wavelength conversion device.
  • the functional layer is provided with enhanced excitation light transmission into the wavelength conversion device, diffuse transmission excitation light function, and transmission excitation.
  • Light reflects and reflects at least one of the laser function, the transmission of the small angle excitation light, and the reflection of the large angle excitation light and all of the laser function.
  • the functional layer may be an antireflection film that enhances blue light transmission, or a frosted layer that diffuses excitation light into the wavelength conversion device, or may be a selective transmission film that transmits blue light and reflects yellow light or transmits small angle excitation light reflection.
  • the high angle excitation light and all of the selected laser light are transmitted through the membrane.
  • the functional layer may also be a combination of any two of the above, or a combination of any three of the above, or a combination of the above four. Any of the above functional layers can increase the probability of excitation light and laser light being mixed in the wavelength conversion device, and function as uniform white light.
  • the functional layer is an antireflection film that enhances blue light transmission, more excitation light enters the wavelength conversion device, so that the excitation light content absorbed by the laser and the wavelength conversion material is improved, and the mixing probability of the laser and the excitation light is increased. , to achieve a uniform uniform white light emission.
  • the functional layer is a transmissive film that transmits blue light and reflects yellow light
  • the blue excitation light enters the wavelength conversion device, is absorbed by the wavelength conversion material and emits a yellow laser beam, and a part is excited by the laser and the excitation light to exit the exit surface.
  • the other part is emitted by the laser from the incident surface 3-1, and is selectively reflected by the film, so that the laser is finally emitted from the exit surface by the laser, and the mixing probability of the laser and the excitation light is increased to achieve a bright uniform white light emission.
  • the functional layer is a small-angle excitation light that reflects a large-angle excitation light and all of the laser-receiving selective transmission films
  • the light can be selectively transmitted through the small-angle excitation light, and the excitation light is transmitted through the film.
  • a small angle is selected to enter the wavelength conversion device through the film, part of it is absorbed by the wavelength conversion material and emits a laser beam, and the other part is reflected by the surface of the wavelength conversion material into a large angle excitation light, and the existence of the permeable film is selected due to the small angle.
  • Both the laser and the large-angle excitation light are reflected, which are emitted from the light-emitting surface, reducing the light loss, and at the same time increasing the mixing probability of the excitation light and the laser.
  • High brightness and uniform white light emission can be achieved.
  • the functional layer is a diffuse transmission layer capable of diffusing transmission of excitation light, such as a frosted layer
  • the mixing probability of the laser and the excitation light can be increased to achieve high-bright uniform white light emission.
  • the functional layer is a sanding layer for enhancing the diffuse transmission function of the excitation light, specifically, the surface of the incident surface is roughened, and the incident excitation light is diffusely transmitted into the wavelength conversion device.
  • the contact area between the excitation light and the wavelength conversion device can be increased, which is advantageous for reducing the temperature extinction characteristics of the wavelength conversion device, improving the fluorescence quantum efficiency, obtaining more laser light, and diffusing after transmission.
  • the excitation light energy is more evenly mixed with the laser to achieve a bright and uniform white light emission.
  • an antireflection film that enhances blue light transmission is disposed on the diffuse transmission layer of the surface roughening treatment, or a blue anti-yellow layer is disposed on the diffuse transmission layer of the surface roughening treatment.
  • the permeable membrane is selected, or the incident surface of the wavelength conversion device is not subjected to roughening treatment, and the above-mentioned anti-reflection coating and selective permeable membrane are directly plated.
  • the working mode and function of the permeable membrane may be referred to the above, and will not be described again.
  • the exit surface 3-2 may also be provided with an anti-reflection film for enhancing the transmission of blue light and yellow light for improving light extraction efficiency.
  • the wavelength conversion device 3 is a polyhedron, preferably a cube or a rectangular parallelepiped.
  • the incident surface 3-1 and the exit surface 3-2 are not adjacent to each other.
  • the incident surface 3-1 and the exit surface 3-2 are opposite surfaces.
  • the incident light is in the same axial direction as the outgoing light.
  • a reflective film may be provided on four faces other than the incident surface 3-1 and the exit surface 3-2, which can further improve the mixing of the excitation light and the laser light.
  • the heat conductive substrate 4 is disposed at the bottom of the wavelength conversion device 3 and is a high thermal conductivity material, and may be a metal or a metal alloy such as aluminum, copper, or the like, or an inorganic compound ceramic such as an aluminum nitride ceramic. Used to dissipate heat from the wavelength conversion device. In other alternative embodiments, the thermally conductive substrate 4 may also be disposed on other surfaces than the incident surface 3-1 and the exit surface 3-2, as long as it can function as a heat sink.
  • FIG. 2 it is a schematic structural diagram of a light source system according to a second embodiment of the present invention.
  • the present embodiment is substantially the same as the first embodiment.
  • the blue excitation light emitted by the laser 1 passes through the homogenizing device 2 to form a uniform rectangular spot, and the YAG:Ce single crystal or transparent is excited after passing through the incident surface 3-1.
  • the ceramic produces a yellow laser, and the unconverted excitation light is mixed with the laser to achieve white light, and the white light is emitted through the 3-2 exit surface.
  • the incident surface 3-1 is adjacent to the exit surface 3-2.
  • the direction in which the laser light is emitted is controlled by providing a reflection film on four other surfaces than the incident surface and the exit surface.
  • This structure excites the incident direction of the light and is not in the same axial direction as the exit direction of the laser light, and the emitted light is more uniform, which is more suitable for white light illumination.
  • FIG. 3 it is a schematic structural diagram of a light source system according to a third embodiment of the present invention.
  • the present embodiment is an improvement made on the basis of the first two embodiments, and is substantially the same as the first two embodiments, except that the incident surface 3-1 of the wavelength conversion device 3 is not required to be used after surface roughening.
  • Enhancing the transmission of the excitation light into the antireflection film and the blue anti-yellow film of the wavelength conversion device but a glass plate 3-3 is disposed between the light-sharing device and the diffuse transmission layer on the optical path, and the glass piece is close to the laser
  • One side of 1 is provided with an anti-reflection film for enhancing the transmission of excitation light into the wavelength conversion device, and a side of the wavelength conversion device is provided with a blue anti-yellow film, and the blue excitation light emitted by the laser 1 passes through the homogenizing device 2
  • a uniform rectangular spot is formed, and the glass plate 3-3 which is plated through the blue anti-yellow film is plated through one side, and then incident on the incident surface 3-1 to excite the YAG:Ce single crystal or the transparent ceramic to generate a yellow laser beam.
  • the unconverted excitation light is mixed with the laser to realize white light, and the white light is emitted through the 3-2 exit surface.
  • Such a structure avoids coating on the diffuse transmission layer of the surface roughening treatment, and since the coating process on the rough surface is complicated and difficult to control, the embodiment can make the process simpler and lower in cost.
  • FIG. 4 it is a schematic structural diagram of a light source system according to a fourth embodiment of the present invention.
  • This embodiment is substantially the same as the embodiment, and includes a laser 1, a wavelength conversion device 3, and a thermally conductive substrate 4.
  • the functional layer is a selective permeable film disposed on the incident surface for transmitting small-angle excitation light and reflecting the large-angle excitation light and all the laser light, and is disposed on the selective permeable film. Enhancing the transmission of the excitation light into the AR coating of the wavelength conversion device.
  • an anti-reflection film can increase the transmittance of the excitation light, improve the light utilization rate and the extraction rate; use a small-angle excitation light to select the permeable film to reflect the large-angle excitation light and the laser light to be emitted from the light-emitting surface, reducing
  • the reflection film can be used to cause total reflection of light on the surface other than the incident surface and the exit surface to be emitted from the light-emitting surface, thereby increasing the mixing probability of the excitation light and the laser light, and improving the uniform effect of white light.
  • the blue excitation light enters the wavelength conversion device through the incident surface and is converted into a yellow laser beam.
  • the excitation light and the laser light are not scattered or scattered in the wavelength conversion device, and the light loss is small. High brightness emission can be achieved.
  • FIG. 5 is a schematic structural diagram of a light source system according to a fifth embodiment of the present invention.
  • the present embodiment is an improvement made on the basis of the fourth embodiment, and is substantially the same as the laser 1, the wavelength conversion device 3, and the thermally conductive substrate 4.
  • the glass plate 3-3 is disposed on the side of the incident surface 3-1 of the wavelength conversion device 3 of the present embodiment for enhancing the transmission of the excitation light into the antireflection film of the wavelength conversion device and for transmitting the small angle excitation light reflection.
  • the selection of the large-angle excitation light and all the laser-receiving light through the film on the same side or both sides of the glass sheet 3-3, and the arrangement of the anti-reflection film and the selective transmission film when disposed on the same side can be referred to the fourth embodiment.
  • another glass piece 3-4 is disposed on one side of the exit surface 3-2 of the wavelength conversion device 3, and an anti-reflection film for transmitting the function of the laser light and the excitation light is disposed thereon.
  • Such a structure avoids coating on the wavelength conversion device, which makes the process simpler and lower in cost.
  • the incident surface 3-1 and the exit surface 3-2 may be adjacently disposed or non-contiguous. Refer to FIG. 5 and FIG. 6 for details.
  • the present invention further provides a projection apparatus comprising the light source system of any of the above embodiments.
  • the utility model has the beneficial effects that the present invention provides a light source system and a projection device using the same, which is provided on the incident surface of the wavelength conversion device to increase the excitation light and the a functional layer that is subjected to a mixing probability of the laser in the wavelength conversion device, by transmitting enhanced excitation light into the wavelength conversion device, diffusing the excitation light into the wavelength conversion device, transmitting the excitation light to the incident surface of the wavelength conversion device, and reflecting the laser light,
  • the incident surface of the wavelength conversion device is transmitted through the small-angle excitation light and reflects the large-angle excitation light and all the laser light, so that the excitation light can be mixed with the laser light in the wavelength conversion device as much as possible to achieve uniform white light emission, and then selected 460 ⁇ 480
  • the blue laser of nm finally achieves high power and high uniformity of the light source and has a good user experience.

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Abstract

本实用新型提供一种光源系统以及采用该光源系统的投影设备，在波长转换装置的入射面设置有可增加所述激发光与所述受激光在所述波长转换装置内混合机率的功能层，通过增强激发光透射入波长转换装置、使激发光漫透射入波长转换装置、使波长转换装置入射面透射激发光并反射受激光、使波长转换装置入射面透射小角度激发光并反射大角度激发光和所有受激光，使激发光能够尽可能多的与受激光在波长转换装置内混合，从而实现均匀的白光发射，通过选用460~480 nm的蓝色激光，最终实现了光源的高功率高均匀性，具有良好的用户体验。

Description

光源系统及投影设备 技术领域
本实用新型涉及光学技术领域，特别是涉及一种投影显示领域。
 
 背景技术
目前，投影显示应用到生活当中的各个方面，其核心部分为空光源系统。LED光源具有较高的能量转换效率，而且寿命长，是冷光源，但是单颗LED的光功率密度较低。有高亮度LED技术通过将多颗LED组合起来，通过对多颗LED的发光进行合光来实现高功率密度的光。然而，该技术方案中，多颗LED组合导致光源体积增大，同时带来了散热部件体积增大的问题，导致该光源单位体积的出射光功率密度低。
 技术问题
LD（Laser Diode，激光二极管）光源与LED光源同为冷光源，但是单颗LD的光功率密度远高于LED的光功率密度。现有技术通常用蓝光LD激发黄色荧光粉的激光激发荧光粉技术获得白光。荧光粉一般用硅胶或者玻璃粉封装，但是硅胶和玻璃封装的方案耐高温能力均有待提高，YAG单晶和透明YAG陶瓷的热导率及机械强度均较强，适合用于高功率的白光照明。但LD光源为相干性光源，而受激光为朗伯光，两者很难实现均匀的白光。
因此实有必要提供一种新的光源系统以解决上述问题。
 技术解决方案
本实用新型主要解决的技术问题是提供一种光源系统及投影设备，能够实现高功率高均匀性的白光照明，具有良好的用户体验。
为解决上述技术问题，本实用新型采用的一个技术方案是：提供一种光源系统，其特征在于，包括：
激光器，用于发出蓝色的激发光，所述蓝色的激发光波长为460~480 nm；
波长转换装置，位于所述激光器的光路上，蓝色的激发光经所述波长转换装置转换成黄色的受激光出射，所述波长转换装置为透明的YAG:Ce3+陶瓷或者YAG:Ce3+单晶；
所述波长转换装置包括用于激发光入射的入射面和用于发出受激光的出射面，所述入射面上设置有可增加所述激发光与所述受激光在所述波长转换装置内混合机率的功能层，所述功能层具备增强所述激发光透射入所述波长转换装置功能、漫透射所述激发光功能、透射所述激发光并反射所述受激光功能或透射小角度激发光并反射大角度激发光和所有受激光功能中的至少一种。
优选的，所述功能层为粗化处理的漫透射层，用于增强所述激发光漫透射功能。
优选的，所述功能层为设置在所述入射面的用于增强所述激发光透射入所述波长转换装置的增透膜和用于可反射大角度激发光并透过小角度激发光的选择透过膜。
优选的，所述功能层还包括设置在所述漫透射层上的用于增强所述激发光透射入所述波长转换装置的增透膜和设置在所述增透膜上的用于透射所述激发光反射所述受激光的选择透过膜。
优选的，所述出射面上设置有用于增强透射所述受激光和所述激发光的增透膜。
优选的，所述波长转换装置为多面体结构，除所述入射面和所述出射面以外的其他面上设置有反射膜以控制受激光的出射方向。
优选的，所述入射面与所述出射面相邻接设置。
优选的，所述激光器与所述波长转换装置之间还设置有用于使所述激发光在所述波长转换装置的入射面上形成均匀光斑的匀光器件，所述波长转换装置还包括设置在光路上位于所述匀光器件与所述漫透射层之间的玻璃片，所述玻璃片靠近所述激发光的一侧设置有用于增强所述激发光透射入所述波长转换装置的增透膜，靠近所述波长转换装置的一面设置有透射所述激发光反射所述受激光的选择透过膜。
优选的，所述波长转换装置除所述入射面与所述出射面之外的至少一个面上设置有导热衬底。
为解决上述技术问题，本实用新型采用的另一个技术方案是：提供一种投影设备，该投影设备包括前文所述的任一项的光源系统。
 
 有益效果
本实用新型的有益效果是：区别于现有技术的情况，本实用新型提供一种光源系统以及采用该光源系统的投影设备，在波长转换装置的入射面设置有可增加所述激发光与所述受激光在所述波长转换装置内混合机率的功能层，通过增强激发光透射入波长转换装置、使激发光漫透射入波长转换装置、使波长转换装置入射面透射激发光并反射受激光、使波长转换装置入射面透射小角度激发光并反射大角度激发光和所有受激光，使激发光能够尽可能多的与受激光在波长转换装置内混合，从而实现均匀的白光发射，通过选用460~480 nm的蓝色激光，最终实现了光源的高功率高均匀性，具有良好的用户体验。
 附图说明
图1是本实用新型光源系统的第一种实施方式的结构示意图；
图2是本实用新型光源系统的第二种实施方式的结构示意图；
图3是本实用新型光源系统的第三种实施方式的结构示意图；
图4是本实用新型光源系统的第四种实施方式的结构示意图；
图5是本实用新型光源系统的第五种实施方式的结构示意图；
图6是本实用新型光源系统的第六第五种实施方式的结构示意图。
 本发明的实施方式
应当理解，此处所描述的具体实施例仅仅用以解释本实用新型，并不用于限定本实用新型。本实用新型主要解决的技术问题是提供一种光源系统及投影设备，能够实现高功率高均匀性的白光照明，具有良好的用户体验。
 
实施例一
请参阅图1所示，是本实用新型第一种实施例提供的一种光源系统的结构示意图。
本实施方式的光源系统包括激光器1、匀光器件2和波长转换装置3、以及导热衬底4。
激光器1可以是固体激光器，气体激光器，半导体激光器中的任意一种，在本实施方式中，优选为半导体激光器，即LD光源（Laser Diode激光二极管），用于发出激发光，在本实用新型中，激光器1为发出蓝色的激发光的蓝光激光器。
匀光器件2为复眼，既可以是单复眼，也可以是双复眼，或者双复眼组，用于使激发光经过匀光器件2在波长转换装置的入射面形成均匀的光斑，具体在本实施方式中，为形成均匀的矩形光斑。
波长转换装置3为透明YAG:Ce3+陶瓷或者YAG:Ce3+单晶，包括用于激发光入射的入射面3-1和用于发出受激光的出射面3-2。蓝色的激发光经匀光器件2入射波长转换装置，经波长转换装置3转换成黄色的受激光出射，未被吸收转换的激发光和波长转换装置转换的受激光混合实现白光发射。
本实施方式选用460~480 nm蓝色的激发光，这种激发光的光束发散角很小，准直性很强，激发光耦合进入波长转换装置中的效率较高，波长转换体的体积较小，能实现高功率密度白光照明。由于445 nm蓝光激光对人眼的损伤较大，从安全性角度来说，选择460~480 nm激发光更适合白光照明。此外，460~480 nm波长范围的激发光激发YAG:Ce单晶或者透明YAG:Ce陶瓷，其量子效率几乎没有变化，且YAG:Ce单晶或者透明YAG:Ce陶瓷在460~480 nm范围内的吸收弱于445~460 nm范围内， 460~480 nm波长范围的激光激发YAG:Ce单晶或者透明YAG:Ce陶瓷产生的光饱和效应更弱，可实现高功率密度白光照明。
入射面3-1上包括功能层，该功能层用以增加激发光与受激光在波长转换装置内混合机率，功能层具备增强激发光透射入波长转换装置功能、漫透射激发光功能、透射激发光并反射所述受激光功能、透射小角度激发光并反射大角度激发光和所有受激光功能中的至少一种功能。例如功能层可以是增强蓝光透射的增透膜，也可以是使激发光漫透射进入波长转换装置的磨砂层，还可以是透射蓝光并反射黄光的选择透过膜或透射小角度激发光反射大角度激发光和所有受激光的选择透过膜。需要说明的是，功能层还可以是上述任意两种的组合，或者是上述任意三种的组合，或者是上述四种的组合。上述任意一种功能层都能增加激发光与受激光在波长转换装置内混合的机率，起到均匀白光的作用。当功能层是增强蓝光透射的增透膜时，更多的激发光进入波长转换装置，使受激光和未被波长转换材料吸收的激发光含量均得到提高，受激光和激发光的混合机率提升，实现高亮的均匀白光发射。
当功能层是透射蓝光并反射黄光的选择透过膜时，蓝色的激发光进入波长转换装置，被波长转换材料吸收并发出黄色的受激光，一部分受激光与激发光混合从出射面出射，另一部分受激光从入射面3-1出射，被选择透过膜反射，使该部分受激光最终也从出射面出射，受激光和激发光的混合机率提升，实现高亮的均匀白光发射。
当功能层是透射小角度激发光反射大角度激发光和所有受激光的选择透过膜时，由于激光扩展量小，几乎可以全部通过小角度激发光选择透过膜，当激发光透过该小角度选择透过膜进入波长转换装置后，一部分被波长转换材料吸收并发出受激光，另一部分被波长转换材料表面反射成为大角度激发光，由于小角度选择透过膜的存在，此时受激光和大角度的激发光均被反射，使其从出光面射出，减小光损失，同时提高了激发光和受激光的混合机率。可实现高亮度均匀白光发射。
当功能层是磨砂层等能够使激发光漫透射的漫透射层时，可以使受激光和激发光的混合机率提升，实现高亮的均匀白光发射。具体在本实施方式中，功能层为粗化处理的用于增强激发光漫透射功能的磨砂层，具体为在入射面的表面进行粗化处理，使入射的激发光发生漫透射进入波长转换装置中，一方面，表面粗化后可以增加激发光和波长转换装置的接触面积，有利于降低波长转换装置的温度消光特性，提高荧光量子效率，获得更多的受激光，另一方面漫透射后的激发光能与受激光混合更加均匀，实现高亮均匀的白光发射。
进一步的，可以采用上述任意两种的组合，例如，在表面粗化处理的漫透射层上设置增强蓝光透射的增透膜，或者在表面粗化处理的漫透射层上设置透蓝反黄的选择透过膜，或者波长转换装置的入射面不进行粗化处理，直接镀制上述增透膜和选择透过膜，其工作方式和作用可参考上述内容，不再赘述。
具体在本实施例中，优选地在表面粗化处理的漫透射层上先设置透蓝光反黄光的选择透过膜，再在选择透过膜上设置增强蓝光透射的增透膜。该方案可以使激发光和受激光的混合效果达到最佳。进一步的，出射面3-2还可以设置有用于增强蓝光和黄光透射的增透膜，用于提高光提取效率。
波长转换装置3为多面体，优选立方体或长方体。在本实施方式中，入射面3-1与出射面3-2为非邻接设置，当选择立方体或长方体状的波长转换装置时，入射面3-1与出射面3-2为相对面，此时入射光与出射光处于同一轴向。为引导混合光仅从出射面发出，可以在除入射面3-1和出射面3-2以外的其他四个面上设置反射膜，该方案可以进一步提高激发光和受激光的混合。
导热衬底4设置在波长转换装置3的底部，为高热导率材料，可以是金属或者金属合金如铝、铜等，也可以是无机化合物陶瓷，如氮化铝陶瓷等。用于将波长转换装置的热量散发出去。在可选择的其他实施方式中，导热衬底4也可以设置在除入射面3-1和出射面3-2以外的其他表面上，只要可以起到散热功能，也是可以实施的。
 
实施例二
参照图2所示，是本实用新型第二种实施例提供的一种光源系统的结构示意图。本实施方式与第一种实施方式大体相同，激光器1发出的蓝色的激发光，经过匀光器件2后形成均匀的矩形光斑，透过入射面3-1后激发YAG:Ce单晶或者透明陶瓷产生黄色的受激光，未被转换的激发光与受激光混合实现白光，白光透过3-2出射面发射。区别仅在于，在本实施方式中，入射面3-1与出射面3-2相邻接。本实施方式同样是通过在除入射面和出射面以外的其他四个面上设置反射膜来控制受激光的出射方向的。这种结构激发光入射方向和受激光的出射方向非同一轴向，出射光更加均匀，更适合白光照明。
 
实施例三
参照图3所示，是本实用新型第三种实施例提供的一种光源系统的结构示意图。本实施方式是在前两种实施方式的基础上做出的改进，与前两种实施方式大体相同，区别仅在于，波长转换装置3的入射面3-1经表面粗化后无需设置用于增强激发光透射入波长转换装置的增透膜和透蓝反黄膜，而是在光路上位于所述匀光器件与漫透射层之间设置有一玻璃片3-3，该玻璃片在靠近激光器1的一侧设置有用于增强激发光透射入波长转换装置的增透膜，靠近波长转换装置的一面设置有透蓝反黄膜，激光器1发出的蓝色的激发光，经过匀光器件2后形成均匀的矩形光斑，透过一面镀增透膜，一面镀透蓝反黄膜的玻璃片3-3后再入射至入射面3-1激发YAG:Ce单晶或者透明陶瓷产生黄色的受激光，未被转换的激发光与受激光混合实现白光，白光透过3-2出射面发射。这样的结构，避免了在表面粗化处理的漫透射层上镀膜，由于在粗糙表面镀膜工艺复杂，难以控制，因此本实施例可以使得工艺更加简单，成本更低。
 
实施例四
参照图4所示，是本实用新型第四种实施例提供的一种光源系统的结构示意图。本实施方式与实施例一大体相同，包括激光器1、波长转换装置3、以及导热衬底4。不同之处在于，本实施方式中功能层为设置在入射面上用于透射小角度激发光并反射大角度激发光和所有受激光的选择透过膜和设置在该选择透过膜上用于增强激发光透射入波长转换装置的增透膜。使用增透膜可以增加激发光的透过率，提高光利用率及提取率；使用小角度激发光选择透过膜可以反射大角度的激发光及受激光，使其从出光面射出，减小光损失，本实施例中，可以使用反射膜使光在除入射面和出射面以外的其他面发生全反射从出光面射出，从而可以增加激发光与受激光的混合机率，提升白光均匀效果。
在本实施方式中，蓝色的激发光经过入射面进入波长转换装置被转换成黄色的受激光，激发光和受激光在波长转换装置内均没有发生散射或者散射很弱，光损失很小，可实现高亮度发射。
 
实施例五
参照图5和图6所示，是本实用新型第五种实施例提供的一种光源系统的结构示意图。本实施方式是在第四种实施方式的基础上做出的改进，与其大体相同，包括激光器1、波长转换装置3、以及导热衬底4。区别仅在于，本实施方式的波长转换装3入射面3-1一侧设置有玻璃片3-3，用于增强激发光透射入波长转换装置的增透膜和用于透射小角度激发光反射大角度激发光和所有受激光的选择透过膜设置玻璃片3-3的同一侧或两侧，当设置在同一侧时增透膜和选择透过膜的设置方式可参考实施例四。进一步的，在波长转换装置3的出射面3-2的一侧还设置有另一玻璃片3-4，其上设置有用于透射受激光和激发光功能的增透膜。这样的结构，避免了在波长转换装置上镀膜，可以使得工艺更加简单，成本更低。其中入射面3-1和出射面3-2即可以为相邻接设置，也可以为非邻接设置。具体分别参照图5和图6。
本实用新型进一步提供一种投影设备，包含如上任意一种实施方式的光源系统。 
本实用新型的有益效果是：区别于现有技术的情况，本实用新型提供一种光源系统以及采用该光源系统的投影设备，在波长转换装置的入射面设置有可增加所述激发光与所述受激光在所述波长转换装置内混合机率的功能层，通过增强激发光透射入波长转换装置、使激发光漫透射入波长转换装置、使波长转换装置入射面透射激发光并反射受激光、使波长转换装置入射面透射小角度激发光并反射大角度激发光和所有受激光，从而使激发光能够尽可能多的与受激光在波长转换装置内混合，实现均匀的白光发射，再通过选用460~480 nm的蓝色激光，最终实现了光源的高功率高均匀性，具有良好的用户体验。
以上所述仅为本实用新型的实施例，并非因此限制本实用新型的专利范围，凡是利用本实用新型说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本实用新型的专利保护范围内。
 

Claims (10)

1.一种光源系统，其特征在于，包括：
激光器，用于发出蓝色的激发光，所述蓝色的激发光波长为460~480 nm；
波长转换装置，位于所述激光器的光路上，蓝色的激发光经所述波长转换装置转换成黄色的受激光出射，所述波长转换装置为透明的YAG:Ce 3+陶瓷或者YAG:Ce 3+单晶；
所述波长转换装置包括用于激发光入射的入射面和用于发出受激光的出射面，所述入射面上设置有可增加所述激发光与所述受激光在所述波长转换装置内混合机率的功能层，所述功能层具备增强所述激发光透射入所述波长转换装置功能、漫透射所述激发光功能、透射所述激发光并反射所述受激光功能或透射小角度激发光并反射大角度激发光和所有受激光功能中的至少一种。
2.根据权利要求1所述的光源系统，其特征在于，所述功能层为粗化处理的漫透射层，用于增强所述激发光漫透射功能。
3.根据权利要求1所述的光源系统，其特征在于，所述功能层为设置在所述入射面的用于增强所述激发光透射入所述波长转换装置的增透膜和用于可反射大角度激发光并透过小角度激发光的选择透过膜。
4.根据权利要求2所述的光源系统，其特征在于，所述功能层还包括设置在所述漫透射层上的用于增强所述激发光透射入所述波长转换装置的增透膜和设置在所述增透膜上的用于透射所述激发光反射所述受激光的选择透过膜。
5.根据权利要求3所述的光源系统，其特征在于，所述出射面上设置有用于增强透射所述受激光和所述激发光的增透膜。
6.根据权利要求1所述的光源系统，其特征在于，所述波长转换装置为多面体结构，除所述入射面和所述出射面以外的其他面上设置有反射膜以控制受激光的出射方向。
根据权利要求6所述的光源系统，其特征在于，所述入射面与所述出射面相邻接设置。
根据权利要求1所述的光源系统，其特征在于，所述激光器与所述波长转换装置之间还设置有用于使所述激发光在所述波长转换装置的入射面上形成均匀光斑的匀光器件，所述波长转换装置还包括设置在光路上位于所述匀光器件与所述漫透射层之间的玻璃片，所述玻璃片靠近所述激发光的一侧设置有用于增强所述激发光透射入所述波长转换装置的增透膜，靠近所述波长转换装置的一面设置有透射所述激发光反射所述受激光的选择透过膜。
9.根据权利要求2所述的光源系统，其特征在于，所述波长转换装置除所述入射面与所述出射面之外的至少一个面上设置有导热衬底。
10.一种投影设备，其特征在于，包括如权利要求1到9任意一项所述的光源系统。
 
 
PCT/CN2018/074752 2017-07-14 2018-01-31 光源系统及投影设备 Ceased WO2019010961A1 (zh)

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