WO2016192623A1 - 波长转换装置、光源系统和投影系统 - Google Patents

波长转换装置、光源系统和投影系统 Download PDF

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Publication number
WO2016192623A1
WO2016192623A1 PCT/CN2016/084244 CN2016084244W WO2016192623A1 WO 2016192623 A1 WO2016192623 A1 WO 2016192623A1 CN 2016084244 W CN2016084244 W CN 2016084244W WO 2016192623 A1 WO2016192623 A1 WO 2016192623A1
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Prior art keywords
reflective
light
wavelength conversion
layer
emitting
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PCT/CN2016/084244
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English (en)
French (fr)
Inventor
田梓峰
徐虎
许颜正
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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Priority to JP2017561934A priority Critical patent/JP6535390B2/ja
Publication of WO2016192623A1 publication Critical patent/WO2016192623A1/zh
Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
    • F21V9/45—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity by adjustment of photoluminescent elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • 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 technical field of projectors, and more particularly to a wavelength conversion device, a light source system and a projection system.
  • solid-state light sources such as LD (Laser Diode) , laser diodes) instead of halogen bulbs as a light source for projectors
  • LD Laser Diode
  • the laser light emitted by the laser diode is irradiated on different regions of the wavelength conversion device as the wavelength conversion device rotates, and since different regions of the wavelength conversion device have phosphor layers of different colors, It is possible to generate laser light of different colors, and after the light is combined by the laser beams of different colors, the projected image is displayed.
  • a conventional wavelength conversion device includes a diffuse reflection layer and a phosphor layer bonded to a surface of the diffuse reflection layer, wherein the diffuse reflection layer is composed of scattering particles and a glass body.
  • the thicker the diffuse reflection layer the higher the reflectivity, but the greater the thermal resistance. Therefore, in the prior art, the thermal resistance is generally reduced by thinning the diffuse reflection layer, and the heat dissipation of the phosphor layer and the wavelength conversion device are improved. Stability, however, this results in a lower reflectivity of the diffuse reflection layer, which in turn results in a lighter effect of the wavelength conversion device.
  • the present invention provides a wavelength conversion device, a light source system, and a projection system to solve the problem of low luminous efficiency of the existing wavelength conversion device.
  • the present invention provides the following technical solutions:
  • a wavelength conversion device comprising a wavelength conversion sheet, the wavelength conversion sheet comprising a reflective layer and a light emitting layer on a side surface of the reflective layer;
  • the luminescent layer includes at least two illuminating regions, and different illuminating regions have different wavelength converting materials; wherein, the thickness of the reflective layer corresponding to at least one of the illuminating regions is smaller than the corresponding to the other illuminating regions The thickness of the reflective layer.
  • the light emitting layer includes a first light emitting region and a second light emitting region
  • the reflective layer includes a first reflective region and a second reflective region, and the first reflective region is disposed corresponding to the first light emitting region.
  • the second reflective area is disposed corresponding to the second light emitting area, and the thickness of the first reflective area is smaller than the thickness of the second reflective area.
  • the wavelength converting material of the first light emitting region is a red phosphor; and the wavelength converting material of the second light emitting region is a yellow phosphor or a green phosphor.
  • the luminescent layer further includes a third illuminating region; the reflective layer further includes a third reflective region, the third reflective region is disposed corresponding to the third illuminating region, and a thickness of the first reflective region Less than the thickness of the third reflective area.
  • the first light-emitting region has a wavelength conversion material that is a red phosphor; the second light-emitting region has a wavelength conversion material that is a blue phosphor; and the third light-emitting region has a wavelength conversion material that is green fluorescent. powder.
  • the luminescent layer further includes a reflective region
  • the reflective layer further includes a third reflective region
  • the third reflective region is disposed corresponding to the reflective region
  • the reflective region is composed of a transparent material or a reflective material.
  • the reflective layer is a diffuse reflection layer, and a surface of the diffuse reflection layer facing away from the light-emitting layer has a heat dissipation layer; or the reflective layer is a reflective ceramic, and the reflective ceramic is alumina ceramic, oxidized A composite ceramic of zirconium ceramic, boron oxide ceramic or zirconia doped alumina.
  • the difference in thickness between the reflective layer corresponding to the at least one of the light-emitting regions and the reflective layer corresponding to the other of the light-emitting regions is 0.02mm ⁇ 0.06mm.
  • the reflective layer corresponding to the at least one of the light-emitting regions is a reflective ceramic
  • the reflective layer corresponding to the other of the light-emitting regions is a diffuse reflective layer
  • the diffused reflective layer has a heat dissipation layer on a side surface away from the light-emitting layer.
  • the reflective ceramic is a composite ceramic of alumina ceramic, zirconia ceramic, boron oxide ceramic or zirconia doped alumina.
  • a light source system comprising an excitation light source and a wavelength conversion device according to any of the above.
  • a projection system comprising a light source system as described above.
  • the wavelength conversion device, the light source system and the projection system provided by the utility model have different thermal effects of different wavelength conversion materials, so that the reflective layer corresponding to the light-emitting region with more heat generation can be thinner, and less heat is generated.
  • the reflective layer corresponding to the light-emitting area is thicker, and the heat dissipation and reflection performance of the phosphor layer are maximized to improve the light-emitting efficiency of the wavelength conversion device.
  • 1 is a cross-sectional view of a wavelength conversion device according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view of a wavelength conversion sheet according to an embodiment of the present invention.
  • FIG. 3 is a top plan view of a wavelength conversion sheet according to an embodiment of the present invention.
  • FIG. 4 is a cross-sectional view of a wavelength conversion sheet according to another embodiment of the present invention.
  • FIG. 5 is a top plan view of a wavelength conversion sheet according to another embodiment of the present invention.
  • FIG. 6 is a schematic cross-sectional view of a reflective layer according to an embodiment of the present invention.
  • the conventional wavelength conversion device generally reduces the thermal resistance by thinning the diffuse reflection layer, improves the heat dissipation of the phosphor layer, and the stability of the wavelength conversion device, but this causes the reflectance of the diffuse reflection layer. Lower, which in turn causes the wavelength conversion device to be less efficient.
  • the inventors have found that the thermal effects of different wavelength conversion materials are different. For example, the thermal effects of blue phosphors and green phosphors are small, and the thermal effects of red phosphors are large. Therefore, blue phosphors and green phosphors can be matched.
  • the reflective layer is thicker, and the reflective layer corresponding to the red phosphor is set to be thin, so that the blue phosphor and the blue phosphor are not satisfied under the premise that the reflectivity of the reflective layer corresponding to the red phosphor is sufficiently high.
  • the heat dissipation of the green phosphor has a significant effect, and the reflectivity of the diffuse reflection layer corresponding to the blue phosphor and the green phosphor and the light effect of the wavelength conversion device can be improved.
  • the present invention provides a wavelength conversion device to overcome the above problems existing in the prior art, the wavelength conversion device comprising a wavelength conversion sheet, the wavelength conversion sheet comprising a reflective layer and sintered on the reflective layer a light emitting layer on the side; the light emitting layer includes at least two light emitting regions, and different light emitting regions have different wavelength converting materials; wherein a thickness of the reflective layer corresponding to at least one of the light emitting regions is smaller than that of the other light emitting regions The thickness of the reflective layer corresponding to the region.
  • the present invention also provides a light source system comprising an excitation source and a wavelength conversion device as described above.
  • the present invention also provides a projection system comprising the light source system as described above.
  • the wavelength conversion device, the light source system and the projection system provided by the utility model have different thermal effects of different wavelength conversion materials, so that the reflective layer corresponding to the light-emitting region with more heat generation can be thinner, and less heat is generated.
  • the reflective layer corresponding to the illuminating region is thicker, so that while meeting the heat dissipation and stability of the phosphor layer, the reflectivity of the partial illuminating region can be improved, and the luminous efficiency of the wavelength conversion device can be improved.
  • the wavelength conversion device includes a wavelength conversion sheet 1 and a driving device 2 that drives the rotation of the wavelength conversion sheet 1.
  • the wavelength conversion sheet 1 is preferably circular.
  • the driving device 2 is a rotating shaft provided at the center of the wavelength conversion sheet 1 and a motor or the like for driving the wavelength conversion sheet 1 to rotate about the central axis of the circle.
  • the wavelength conversion sheet 1 includes a reflective layer 11 and a light-emitting layer 12 sintered on the side of the reflective layer 11.
  • the light-emitting layer 12 includes at least two light-emitting regions, such as light-emitting regions 120 and 121, different light-emitting regions have different wavelength converting materials, and the thickness of the reflective layer corresponding to at least one of the light-emitting regions is less than The thickness of the reflective layer corresponding to the other illuminating regions.
  • the reflective layer corresponding to the blue light emitting region and the green light emitting region may be set thicker, and the reflective layers of other light emitting regions may be set thinner.
  • the invention is not limited thereto, and the specific thickness of the reflective layer may be set according to the thermal effect of the wavelength conversion material of the light-emitting region, that is, the phosphor.
  • the wavelength conversion material refers to a material that can convert light incident on the wavelength conversion material into light of different wavelengths, including well-known materials such as phosphors, nano luminescent materials, and quantum dots.
  • the light emitting layer 12 may include a first light emitting region 120 and a second light emitting region 121
  • the reflective layer 11 may include a first reflective region 110 and a second reflective region.
  • the first reflective area 110 and the first light-emitting area 120 are correspondingly disposed, and the second reflective area 111 and the second light-emitting area 121 are correspondingly disposed, that is, in a direction perpendicular to the wavelength conversion sheet 1, the first reflective area 110
  • the projection overlaps with the projection of the first light-emitting region 120, the projection of the second reflective region 111 overlaps with the projection of the second light-emitting region 121, and the thickness of the first reflective region 110 is smaller than the thickness of the second reflective region 111.
  • the thickness difference D of the first reflective region 110 and the second reflective region 111 ranges from 0.02 mm to 0.06 mm.
  • the wavelength conversion material of the first illuminating region 120 may be a red phosphor
  • the wavelength converting material of the second illuminating region 121 may be a yellow phosphor or a green phosphor.
  • the present invention is not limited thereto, as long as the second illuminating
  • the thermal effect of the wavelength converting material of the region 121 may be smaller than the wavelength converting material of the first light emitting region 120.
  • the light emitting layer 12 may include a first light emitting region 120, a second light emitting region 121, and a third light emitting region 122, and the reflective layer 11 may include a first reflective region. 110.
  • the second reflective area 111 and the third reflective area 112 wherein the first reflective area 110 and the first light-emitting area 120 are correspondingly disposed, the second reflective area 111 and the second light-emitting area 121 are correspondingly disposed, and the third reflective area 112 and The third light-emitting region 122 is correspondingly disposed, that is, in a direction perpendicular to the wavelength conversion sheet 1, the projection of the first reflective region 110 and the projection of the first light-emitting region 120 overlap, the projection of the second reflective region 111 and the second light-emitting region 121 The projections overlap, and the projection of the third reflective area 112 overlaps with the projection of the third illumination area 122.
  • the thickness of the first reflective region 110 is smaller than the thickness of the second reflective region 111, and the thickness of the first reflective region 110 is smaller than the thickness of the third reflective region 112.
  • the difference in thickness between the first reflective region 110 and the second reflective region 111 ranges from 0.02 mm to 0.06 mm, and the difference in thickness between the first reflective region 110 and the third reflective region 112 ranges from 0.02 mm to 0.06 mm.
  • the thickness of the second reflective region 111 and the third reflective region 112 may be the same or different, and the specific thickness value may be set according to the wavelength conversion material of the corresponding light-emitting region and actual needs.
  • the first light-emitting region 120 has a wavelength conversion material that may be a red phosphor; the second light-emitting region 121 has a wavelength conversion material that may be a blue phosphor; and the third light-emitting region 122 has a wavelength conversion material that may be a green phosphor.
  • Powder of course, the invention is not limited thereto.
  • the first light-emitting region 120 has a wavelength conversion material which may be a red phosphor; and the second light-emitting region 121 has a wavelength conversion material which may be green fluorescent light.
  • the third illuminating region 122 may be a reflective region, and the reflective region is composed of a transparent material or a reflective material for reflecting blue light of the excitation light, so that the reflected blue light can synthesize white light with red light and green light, wherein the reflective material can be combined with
  • the reflective layer is of the same material and may be other reflective materials well known in the art.
  • the thickness of the first reflective region 110 may be smaller than the thickness of the second reflective region 111, and the thickness of the first reflective region 110 may be smaller than the thickness of the third reflective region 112.
  • the range of the difference in thickness between the first reflective region 110 and the second reflective region 111 and the difference in thickness between the first reflective region 110 and the third reflective region 112 are both in the range of 0.02 mm to 0.06 mm.
  • the luminescent layer 12 may further include four or more illuminating regions, for example, the luminescent layer 12 may include a red phosphor region, a green phosphor region, a blue phosphor region, and a yellow phosphor region, and the present invention does not By definition, the thickness of the reflective layer can be set according to the wavelength conversion material of the specific light-emitting region.
  • the light-emitting layer 12 is not limited to only the visible light-emitting region, and may also include an infrared light phosphor region for infrared imaging.
  • the reflective layer 11 in this embodiment may include a diffuse reflection layer 113 and a heat dissipation layer 114 on a side of the diffuse reflection layer 113 facing away from the light-emitting layer 12, with reference to FIG. 6; the reflective layer 11 may also be a ceramic reflective layer.
  • the thickness of the reflective ceramic ranges from 0.1 mm to 1.5 mm.
  • the reflective layer 11 may also be a reflective ceramic corresponding to a part of the light-emitting area, and the reflective layer corresponding to a part of the light-emitting area is a diffuse reflection layer and a heat dissipation layer, that is, the reflective layer corresponding to at least one light-emitting area is a reflective ceramic, and the other light-emitting areas correspond to The reflective layer is a diffuse reflection layer and a heat dissipation layer.
  • the reflective layer corresponding to the light-emitting region 121 having a blue phosphor or a green phosphor may be a reflective ceramic, and the other light-emitting regions such as 120 corresponding to the reflective layer are diffuse reflection layers. And heat sink.
  • the diffuse reflection layer 113 is composed of white scattering ions and a glass body that bonds the scattering particles, and the heat dissipation layer 114 is a high heat dissipation aluminum nitride ceramic.
  • the reflective ceramic may be a highly reflective white ceramic which may be a composite ceramic of alumina ceramic, zirconia ceramic, boron oxide ceramic or zirconia doped alumina.
  • the reflective layer corresponding to the light-emitting region that generates more heat can be set thinner, and the reflective layer corresponding to the light-emitting region with less heat is generated.
  • the thickness is set so as to improve the heat dissipation and stability of the phosphor layer, and also improve the reflectivity of the reflective layer and improve the light efficiency of the wavelength conversion device.
  • Another embodiment of the present invention further provides a light source system comprising an excitation light source and a wavelength conversion device provided by any of the above embodiments, wherein the excitation light emitted by the laser light source is irradiated onto the light emitting layer of the wavelength conversion device At least two different colors of laser light are excited, and the laser beams of different colors are reflected by the reflective layer and then enter a subsequent converging lens to be concentrated and collimated to synthesize a white light for projecting the image.
  • Yet another embodiment of the present invention also provides a projection system including the light source system as described above, in addition to a light splitting system and a light modulation system that modulates light.
  • the light source system and the projection system provided by the embodiment have different thicknesses of the reflective layers corresponding to different light-emitting areas, thereby improving the reflectivity of the reflective layer and improving the wavelength conversion device while satisfying the heat dissipation and stability of the phosphor layer.
  • the light effect .

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection Apparatus (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

一种波长转换装置、光源系统和投影系统。波长转换装置包括波长转换片（1），波长转换片（1）包括反射层（11）以及位于所述反射层（11）一侧表面的发光层（12）。发光层（12）包括至少两个发光区，不同的发光区具有不同的波长转换材料，其中，与至少一个发光区对应的反射层（11）的厚度小于与其他发光区对应的反射层（11）的厚度。将产生热量较多的发光区对应的反射层（11）设置为较薄，将产生热量较少的发光区对应的反射层（11）设置为较厚，在满足荧光粉层散热和稳定性的同时，能提高反射层（11）的反射率，提高波长转换装置的光效。

Description

波长转换装置、光源系统和投影系统 技术领域
本实用新型涉及投影仪技术领域，更具体地说，涉及一种波长转换装置、光源系统和投影系统。
背景技术
随着半导体技术的发展，采用固态光源如 LD （ Laser Diode ，激光二极管）代替卤素灯泡作为投影机的光源，已经成为一个重要的技术发展方向。在采用激光二极管作为光源的投影系统中，激光二极管发出的激光随着波长转换装置的转动照射在波长转换装置的不同区域上，由于波长转换装置的不同区域具有不同颜色的荧光粉层，因此，能够产生不同颜色的受激光，这些不同颜色的受激光合成一束光后，进行投影图像的显示。
技术问题
现有的一种波长转换装置，包括漫反射层和粘结于漫反射层表面的荧光粉层，其中漫反射层由散射颗粒和玻璃体组成。该漫反射层越厚，反射率越高，但热阻也会越大，因此，现有技术中通常通过减薄漫反射层来减少热阻，提高荧光粉层的散热性和波长转换装置的稳定性，但是，这样会导致漫反射层的反射率较低，进而导致波长转换装置的光效不高。
技术解决方案
有鉴于此，本实用新型提供了一种波长转换装置、光源系统和投影系统，以解决现有的波长转换装置发光效率低的问题。
为实现上述目的，本实用新型提供如下技术方案：
一种波长转换装置，所述波长转换装置包括波长转换片，所述波长转换片包括反射层以及位于所述反射层一侧表面的发光层；
所述发光层包括至少两个发光区，不同的发光区具有不同的波长转换材料；其中，与至少一个所述发光区对应的所述反射层的厚度小于与其他所述发光区对应的所述反射层的厚度。
优选的，所述发光层包括第一发光区和第二发光区；所述反射层包括第一反射区和第二反射区，所述第一反射区与所述第一发光区对应设置，所述第二反射区与所述第二发光区对应设置，所述第一反射区的厚度小于所述第二反射区的厚度。
优选的，所述第一发光区的波长转换材料为红色荧光粉；所述第二发光区的波长转换材料为黄色荧光粉或绿色荧光粉。
优选的，所述发光层还包括第三发光区；所述反射层还包括第三反射区，所述第三反射区与所述第三发光区对应设置，且所述第一反射区的厚度小于所述第三反射区的厚度。
优选的，所述第一发光区具有的波长转换材料为红色荧光粉；所述第二发光区具有的波长转换材料为蓝色荧光粉；所述第三发光区具有的波长转换材料为绿色荧光粉。
优选的，所述发光层还包括反光区，所述反射层还包括第三反射区，所述第三反射区与所述反光区对应设置，所述反光区由透明材料或反射材料构成。优选的，所述反射层为漫反射层，所述漫反射层背离所述发光层的一侧表面具有散热层；或者，所述反射层为反射陶瓷，所述反射陶瓷为氧化铝陶瓷、氧化锆陶瓷、氧化硼陶瓷或氧化锆掺杂氧化铝的复合陶瓷。
优选的，所述与至少一个所述发光区对应的所述反射层的厚度与其他所述发光区对应的所述反射层的厚度差为 0.02mm~0.06mm 。
优选的，与至少一个所述发光区对应的反射层为反射陶瓷，与其他所述发光区对应的反射层为漫反射层，所述漫反射层背离所述发光层的一侧表面具有散热层，所述反射陶瓷为氧化铝陶瓷、氧化锆陶瓷、氧化硼陶瓷或氧化锆掺杂氧化铝的复合陶瓷。
一种光源系统，包括激发光源和如上任一项所述的波长转换装置。
一种投影系统，包括如上所述的光源系统。
 有益效果
与现有技术相比，本实用新型所提供的技术方案具有以下优点：
本实用新型所提供的波长转换装置、光源系统和投影系统，由于不同波长转换材料的热效应不同，因此，可以将产生热量较多的发光区对应的反射层设置的较薄，将产生热量较少的发光区对应的反射层设置的较厚，最大限度的满足荧光粉层的散热和反射性能，提高波长转换装置的光效。
 附图说明
为了更清楚地说明本实用新型实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本实用新型的实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据提供的附图获得其他的附图。
图 1 为本发明的一个实施例提供的波长转换装置的剖面图；
图 2 为本发明的一种具体实施例方式提供的波长转换片的剖面图；
图 3 为本发明的一种具体实施例方式提供的波长转换片的俯视图；
图 4 为本发明的另一种具体实施例方式提供的波长转换片的剖面图；
图 5 为本发明的另一种具体实施例方式提供的波长转换片的俯视图；
图 6 为本发明的一个实施例提供的一种反射层的剖面结构示意图。
 本发明的最佳实施方式
正如背景技术所述，现有的波长转换装置通常通过减薄漫反射层来减少热阻，提高荧光粉层的散热性和波长转换装置的稳定性，但是，这样会导致漫反射层的反射率较低，进而导致波长转换装置的光效不高。
发明人研究发现，不同波长转换材料的热效应是不同的，例如蓝色荧光粉和绿色荧光粉的热效应较小，红色荧光粉的热效应较大，因此，可以将蓝色荧光粉和绿色荧光粉对应的反射层设置的较厚，将红色荧光粉对应的反射层设置的较薄，这样在满足了红色荧光粉对应的反射层的反射率足够高的前提下，既不会对蓝色荧光粉和绿色荧光粉的散热产生明显影响，又能够提高蓝色荧光粉和绿色荧光粉对应的漫反射层的反射率和波长转换装置的光效。
基于此，本实用新型提供了一种波长转换装置，以克服现有技术存在的上述问题，所述波长转换装置包括波长转换片，所述波长转换片包括反射层以及烧结于所述反射层一侧的发光层；所述发光层至少包括两个发光区，不同的发光区具有不同的波长转换材料；其中，与至少一个所述发光区对应的所述反射层的厚度小于与其他所述发光区对应的所述反射层的厚度。
本实用新型还提供了一种光源系统，包括激发光源和如上所述的波长转换装置。
本实用新型还提供了一种投影系统，包括如上所述的光源系统。
本实用新型所提供的波长转换装置、光源系统和投影系统，由于不同波长转换材料的热效应不同，因此，可以将产生热量较多的发光区对应的反射层设置的较薄，将产生热量较少的发光区对应的反射层设置的较厚，这样在满足荧光粉层散热和稳定性的同时，还能提高部分发光区的反射率，提高波长转换装置的光效。
以上是本实用新型的核心思想，为使本实用新型的上述目的、特征和优点能够更加明显易懂，下面结合附图对本实用新型的具体实施方式做详细的说明。
在下面的描述中阐述了很多具体细节以便于充分理解本实用新型，但是本实用新型还可以采用其他不同于在此描述的其它方式来实施，本领域技术人员可以在不违背本实用新型内涵的情况下做类似推广，因此本实用新型不受下面公开的具体实施例的限制。
其次，本实用新型结合示意图进行详细描述，在详述本实用新型实施例时，为便于说明，表示器件结构的剖面图会不依一般比例作局部放大，而且所述示意图只是示例，其在此不应限制本实用新型保护的范围。此外，在实际制作中应包含长度、宽度及深度的三维空间尺寸。
下面通过实施例来对本实用新型进行详细描述。
本发明的一个实施例提供了一种波长转换装置，如图1所示，波长转换装置包括波长转换片1和驱动波长转换片1转动的驱动装置2，该波长转换片1优选为圆形的片状结构，驱动装置2为设置在波长转换片1圆心的转轴以及马达等装置，用于驱使波长转换片1绕圆的中心轴转动。
本实施例中，参考图2和图4，波长转换片1包括反射层11和烧结于反射层11一侧的发光层12。参考图3和图5，发光层12包括至少两个发光区，如发光区120和121，不同的发光区具有不同的波长转换材料，并且，与至少一个发光区对应的反射层的厚度小于与其他发光区对应的反射层的厚度。由于蓝色荧光粉和绿色荧光粉的热效应较小，因此，蓝光发光区和绿光发光区对应的反射层可以设置的较厚，其他的发光区的反射层可以设置的较薄，当然，本发明并不仅限于此，反射层的具体厚度可以根据发光区波长转换材料即荧光粉的热效应大小而设定。
本实施例中，波长转换材料是指可以将入射于波长转换材料的光转换成不同波长的光的材料，包括荧光粉、纳米发光材料和量子点等熟知的材料。
在本发明的一种具体实施方式中，参考图2和图3，发光层12可以包括第一发光区120和第二发光区121，反射层11可以包括第一反射区110和第二反射区111，其中，第一反射区110和第一发光区120对应设置，第二反射区111和第二发光区121对应设置，即在垂直于波长转换片1的方向上，第一反射区110的投影和第一发光区120的投影重叠，第二反射区111的投影和第二发光区121的投影重叠，并且，第一反射区110的厚度小于第二反射区111的厚度。优选的，第一反射区110和第二反射区111的厚度差D的范围为0.02mm~0.06mm。
具体地，第一发光区120的波长转换材料可以为红色荧光粉，第二发光区121的波长转换材料可以为黄色荧光粉或绿色荧光粉，当然，本发明并不仅限于此，只要第二发光区121的波长转换材料的热效应小于第一发光区120的波长转换材料即可。
本发明的另一种具体实施方式中，参考图4和图5，发光层12可以包括第一发光区120、第二发光区121和第三发光区122，反射层11可以包括第一反射区110、第二反射区111和第三反射区112，其中，第一反射区110和第一发光区120对应设置，第二反射区111和第二发光区121对应设置，第三反射区112和第三发光区122对应设置，即在垂直于波长转换片1的方向上，第一反射区110的投影和第一发光区120的投影重叠，第二反射区111的投影和第二发光区121的投影重叠，第三反射区112的投影和第三发光区122的投影重叠。
并且，第一反射区110的厚度小于第二反射区111的厚度，第一反射区110的厚度小于第三反射区112的厚度。优选的，第一反射区110和第二反射区111的厚度差的范围为0.02mm~0.06mm，第一反射区110和第三反射区112的厚度差的范围为0.02mm~0.06mm。此外，第二反射区111和第三反射区112的厚度可以相同，也可以不相同，具体厚度值可根据对应发光区的波长转换材料以及实际需求进行设定。
具体地，第一发光区120具有的波长转换材料可以为红色荧光粉；第二发光区121具有的波长转换材料可以为蓝色荧光粉；第三发光区122具有的波长转换材料可以为绿色荧光粉，当然，本发明并不仅限于此。
在本发明的又一种实施方式中，在激发光源为蓝光的情况下，第一发光区120具有的波长转换材料可以为红色荧光粉；第二发光区121具有的波长转换材料可以为绿色荧光粉；第三发光区122可以为反光区，该反光区由透明材料或反射材料构成，用于反射激发光蓝光，以便反射后的蓝光能够与红光和绿光合成白光，其中该反射材料可以与反射层的材料相同，也可以是其他本领域熟知的反射材料。同样，第一反射区110的厚度可以小于第二反射区111的厚度，第一反射区110的厚度可以小于第三反射区112的厚度。第一反射区110和第二反射区111的厚度差的范围以及第一反射区110和第三反射区112的厚度差的范围均为0.02mm~0.06mm。
此外，发光层12还可以包括四个甚至更多的发光区，如发光层12可以包括红色荧光粉区、绿色荧光粉区、蓝色荧光粉区和黄色荧光粉区，本发明也并不对此进行限定，相应地反射层的厚度可根据具体发光区的波长转换材料进行设定。
此外，发光层12也不仅仅限于可见光发光区，其也可以包括红外光荧光粉区，用于红外成像。
进一步地，本实施例中的反射层11可以包括漫反射层113和位于所述漫反射层113背离发光层12一侧的散热层114，参考图6；反射层11也可以为陶瓷反射层，优选的，反射陶瓷的厚度范围为0.1mm~1.5mm。
此外，反射层11也可以一部分发光区对应的反射层为反射陶瓷，一部分发光区对应的反射层为漫反射层和散热层，即至少一个发光区对应的反射层为反射陶瓷，其他发光区对应的反射层为漫反射层和散热层，参考图2，具有蓝色荧光粉或绿色荧光粉的发光区121对应的反射层可以为反射陶瓷，其他发光区如120对应的反射层为漫反射层和散热层。
其中，漫反射层113由白色散射离子和粘结所述散射粒子的玻璃体构成，散热层114为高散热氮化铝陶瓷。反射陶瓷可以为高反射白色陶瓷，其可以是氧化铝陶瓷、氧化锆陶瓷、氧化硼陶瓷或氧化锆掺杂氧化铝的复合陶瓷。
本实施例提供的波长转换装置，由于不同波长转换材料的热效应不同，因此，可以将产生热量较多的发光区对应的反射层设置的较薄，将产生热量较少的发光区对应的反射层设置的较厚，这样在满足荧光粉层散热和稳定性的同时，还能提高反射层的反射率，提高波长转换装置的光效。
本实用新型的另一个实施例还提供了一种光源系统，该光源系统包括激发光源和如上任一实施例提供的波长转换装置，激光光源发射的激发光照射到波长转换装置的发光层上后，则会激发出至少两种不同颜色的受激光，这些不同颜色的受激光经过反射层反射后进入后续的会聚透镜等进行会聚准直，以合成投影图像所用的一束白光。
本实用新型的又一个实施例还提供了一种投影系统，该投影系统包括如上所述的光源系统，除此之外还包括分光合光系统和对光线进行调制的光调制系统等。
本实施例提供的光源系统和投影系统，由于不同发光区对应的反射层的厚度不同，因此，在满足荧光粉层散热和稳定性的同时，还能提高反射层的反射率，提高波长转换装置的光效。
本说明书中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似部分互相参见即可。对所公开的实施例的上述说明，使本领域专业技术人员能够实现或使用本实用新型。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本实用新型的精神或范围的情况下，在其它实施例中实现。因此，本实用新型将不会被限制于本文所示的这些实施例，而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。

Claims (11)

1、一种波长转换装置，其特征在于，所述波长转换装置包括波长转换片，所述波长转换片包括反射层以及位于所述反射层一侧表面的发光层；
所述发光层包括至少两个发光区，不同的发光区具有不同的波长转换材料；其中，与至少一个所述发光区对应的所述反射层的厚度小于与其他所述发光区对应的所述反射层的厚度。
2、根据权利要求1所述的波长转换装置，其特征在于，所述发光层包括第一发光区和第二发光区；
所述反射层包括第一反射区和第二反射区，所述第一反射区与所述第一发光区对应设置，所述第二反射区与所述第二发光区对应设置，所述第一反射区的厚度小于所述第二反射区的厚度。
3、根据权利要求2所述的波长转换装置，其特征在于，所述第一发光区的波长转换材料为红色荧光粉；所述第二发光区的波长转换材料为黄色荧光粉或绿色荧光粉。
4、根据权利要求2所述的波长转换装置，其特征在于，所述发光层还包括第三发光区；所述反射层还包括第三反射区，所述第三反射区与所述第三发光区对应设置，且所述第一反射区的厚度小于所述第三反射区的厚度。
5、根据权利要求4所述的波长转换装置，其特征在于，所述第一发光区具有的波长转换材料为红色荧光粉；所述第二发光区具有的波长转换材料为蓝色荧光粉；所述第三发光区具有的波长转换材料为绿色荧光粉。
6、根据权利要求2所述的波长转换装置，其特征在于，所述发光层还包括反光区，所述反射层还包括第三反射区，所述第三反射区与所述反光区对应设置，所述反光区由透明材料或反射材料构成。
7、根据权利要求1~6任一项所述的波长转换装置，其特征在于，所述反射层为漫反射层，所述漫反射层背离所述发光层的一侧表面具有散热层；或者，所述反射层为反射陶瓷，所述反射陶瓷为氧化铝陶瓷、氧化锆陶瓷、氧化硼陶瓷或氧化锆掺杂氧化铝的复合陶瓷。
8、根据权利要求7所述的波长转换装置，其特征在于，与至少一个所述发光区对应的所述反射层的厚度与其他所述发光区对应的所述反射层的厚度差为0.02mm~0.06mm。
9、根据权利要求1~6任一项所述的波长转换装置，其特征在于，与至少一个所述发光区对应的反射层为反射陶瓷，与其他所述发光区对应的反射层为漫反射层，所述漫反射层背离所述发光层的一侧表面具有散热层，所述反射陶瓷为氧化铝陶瓷、氧化锆陶瓷、氧化硼陶瓷或氧化锆掺杂氧化铝的复合陶瓷。
10、一种光源系统，其特征在于，包括激发光源和权利要求1~9任一项所述的波长转换装置。
11、一种投影系统，其特征在于，包括权利要求10所述的光源系统。
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