WO2017181965A1 - 一种反射装置及相关波长转换装置、色轮和光源系统 - Google Patents

一种反射装置及相关波长转换装置、色轮和光源系统 Download PDF

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Publication number
WO2017181965A1
WO2017181965A1 PCT/CN2017/081247 CN2017081247W WO2017181965A1 WO 2017181965 A1 WO2017181965 A1 WO 2017181965A1 CN 2017081247 W CN2017081247 W CN 2017081247W WO 2017181965 A1 WO2017181965 A1 WO 2017181965A1
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Prior art keywords
ceramic substrate
light
glass layer
reflection
layer
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PCT/CN2017/081247
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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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    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements

Definitions

  • the utility model relates to the technical field of illumination and display, in particular to a reflection device and a related wavelength conversion device, a color wheel and a light source system.
  • the researchers have developed another structure of the reflector, as shown in Figure 1, including white particles (such as alumina, titanium oxide and zirconia, such as higher whiteness particles) and glass (such as silicate glass) , borate glass, etc.) a diffusely reflective glass layer S1 composed of a glass body and an aluminum nitride ceramic substrate S2 for carrying the diffuse reflection glass layer S1 and for heat dissipation.
  • white particles such as alumina, titanium oxide and zirconia, such as higher whiteness particles
  • glass such as silicate glass
  • borate glass borate glass
  • the reflectance of the aluminum nitride ceramic substrate S2 is not high, and its main function is as a load-bearing and heat-dissipating substrate in the preparation and use of the diffuse-reflecting glass layer S1, so the reflectance is mainly caused by the diffuse reflection glass layer. S1 is available.
  • the thickness of the diffusely reflective glass layer needs to be sufficient.
  • the diffuse reflection glass layer and the ceramic carrier substrate have different thermal expansion coefficients, the excessively thick diffuse reflection glass layer is easily cracked during the sintering process, so that the yield of the reflective structure is low. Therefore, a new type of reflecting device needs to be developed.
  • the utility model provides a reflecting device which solves the problem of cracking of the diffuse reflection glass layer without changing its diffuse reflection characteristics, and provides related wavelength conversion device, color wheel and light source system on the basis of the invention.
  • a reflective device includes a ceramic substrate, and further includes a diffusely reflective glass layer on the first surface of the ceramic substrate, the diffuse reflective glass layer including the ceramic substrate away from the ceramic substrate a second surface, the ceramic substrate is a dense structural ceramic body;
  • the stereoscopic divergence angle of the reflected light formed by the first surface is smaller than the stereoscopic divergence angle of the reflected light formed by the second surface, wherein a stereoscopic divergence angle of a light beam is that the light intensity of the light beam is not less than the light beam a solid angle enclosed by a 50% area of the central light intensity;
  • the thickness of the above diffuse reflection glass layer is between 0.04 mm and 0.15 mm.
  • the thickness of the diffuse reflection glass layer is between 0.08 mm and 0.12 mm.
  • the diffuse reflection glass layer is a diffuse reflection layer composed of white particles and glass.
  • the ceramic substrate has a porosity of 15% or less.
  • the ceramic substrate is one selected from the group consisting of an alumina ceramic substrate, a zirconia ceramic substrate, a boron nitride ceramic substrate, and a zirconia-doped alumina composite ceramic substrate.
  • the ceramic substrate is a composite ceramic substrate of zirconia-doped alumina.
  • the thickness of the ceramic substrate is greater than 0.5 mm.
  • the present invention provides a wavelength conversion device including a light emitting layer and a reflective layer, wherein the reflective layer includes the reflective device of the first aspect, and the light emitting layer is located on the diffuse reflective glass layer. On the second surface, the light-emitting layer is configured to convert light incident on the light-emitting layer into light of different wavelengths.
  • the present invention provides a color wheel comprising a wavelength conversion region and a reflection region, wherein the reflection region comprises a reflection device according to the first aspect, the wavelength conversion region and the reflection region are in a color wheel The surface is spliced into an annular shape.
  • a light source system includes the color wheel of the third aspect, further comprising an excitation light source and a driving device, wherein the excitation light source is configured to emit excitation light to the color wheel.
  • the driving device is configured to drive the color wheel to rotate so that the wavelength conversion region and the reflection region on the color wheel periodically receive the illumination of the excitation light.
  • the ceramic substrate having a small stereoscopic divergence angle of the surface reflected light is combined with the diffuse reflection glass layer having a large stereoscopic divergence angle of the surface reflected light, and the stereoscopic divergence angle of the surface reflected light of the ceramic substrate is small.
  • the density is higher than the density of the non-glass portion of the diffusely reflective glass layer, so that the ceramic substrate has a higher reflectivity, and the dense structural ceramic body is used to replace the existing aluminum nitride substrate, so that even if the diffuse reflection glass layer is thinned
  • the thickness also does not affect the overall reflectivity.
  • the utility model utilizes the composite emission structure of the ceramic substrate and the diffuse reflection glass layer to solve the problem of cracking when the diffuse reflection glass layer is thick, and to ensure that the reflection device has good diffuse reflection characteristics.
  • FIG. 1 is a schematic structural view of a reflection device in the prior art
  • FIG. 2 is a schematic structural view of a reflection device according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural view of a wavelength conversion device according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural view of a color wheel according to an embodiment of the present invention.
  • S1 a diffusely reflective glass layer
  • Fig. 1 shows the structure of a reflection device in the prior art, comprising a diffuse reflection glass layer S1 sintered on a highly reflective substrate and a ceramic substrate S2 for sintering the diffuse reflection glass layer S1.
  • the diffuse reflection glass layer S1 is generally composed of white particles (for example, higher whiteness particles such as alumina, titania and zirconia) and glass (for example, silicate glass, borate glass, etc.); ceramic substrate S2 It is generally an aluminum nitride ceramic.
  • the thickness of the diffuse reflection glass layer S1 is 0.15 mm or more, and the S1 is too thick during the sintering process to cause cracking of the diffuse reflection glass layer.
  • the present invention provides a novel reflection device.
  • 2 shows the structure of a reflecting device according to an embodiment of the present invention, which comprises a ceramic substrate S3 and a diffusely reflective glass layer S1 on a ceramic substrate S3, wherein the ceramic substrate S3 is a dense structural ceramic body.
  • the diffuse reflection glass layer S1 is located on the first surface of the ceramic substrate S3, and the diffuse reflection glass layer S1 further includes a second surface remote from the ceramic substrate S3, which is the light incident surface of the reflection device.
  • the stereoscopic divergence angle of the reflected light formed by the first surface is smaller than the stereoscopic divergence angle of the reflected light formed by the second surface, wherein the stereoscopic divergence angle of the light beam is such that the light intensity of the light beam is not less than the center of the light beam.
  • a solid angle surrounded by a region of 50% of the light intensity, the steric divergence angle of the first surface is small, meaning that the diffuse reflection performance of the first surface is poor, and also means that the density of the ceramic substrate is high.
  • the porosity of the dense structural ceramic body used as the ceramic substrate is generally preferably 15% or less, and such porosity can ensure a high reflectance.
  • the high density of the ceramic substrate means that its thermal conductivity is better than that of the low-density ceramic of the same material, which compensates for the problem of lowering the thermal conductivity due to the replacement of the high thermal conductivity of the aluminum nitride ceramic.
  • the reflectivity of the ceramic substrate is positively correlated with its density, and negatively correlated with the porosity, and the porosity is positively correlated with the diffuse reflection property, so the reflectivity of the ceramic substrate is Diffuse reflectivity is inversely proportional.
  • the preferred embodiment of the present invention selects a ceramic substrate having a porosity of 15% or less to ensure that the reflectance is sufficiently high, so that it is not necessary to increase the thickness of the diffuse reflection glass layer, and the thickness.
  • a diffusely reflective glass layer between 0.04 mm and 0.15 mm is sufficient to provide the desired diffuse reflection properties.
  • the porosity is generally defined in the art, that is, the percentage of the pore volume in the bulk material to the total volume of the material in the natural state.
  • the utility model adopts a dense structure high reflectivity ceramic substrate (the reflectance is higher than the reflectivity of the aluminum nitride ceramic) to replace the existing aluminum nitride ceramic, thereby improving the reflectance. Then, the thickness of the diffuse reflection glass layer S1 is thinned to solve the problem of cracking of the diffuse reflection glass layer. Since the reflectance of the ceramic substrate is improved, even if the diffuse reflection glass layer is thinned, the overall reflectance is not affected, and the scattering angle also satisfies the requirements. .
  • the diffuse reflection glass layer S1 is on the dense structure ceramic body substrate, and the diffuse reflection glass layer S1 is also composed of white particles (such as alumina, titanium oxide and zirconia, etc.). It is composed of glass (for example, silicate glass, borate glass, etc.), except that the thickness of the diffuse reflection glass layer S1 of the present invention is less than 0.15 mm, specifically between 0.04 mm and 0.15 mm. When the thickness of the diffuse reflection glass layer is greater than 0.15 mm, since the thermal expansion coefficient of the diffuse reflection glass layer is different from the thermal expansion coefficient of the ceramic substrate, under the action of thermal stress, the diffuse reflection glass layer is liable to be cracked during the process. .
  • the thickness of the diffusely reflective glass layer S1 in the present invention should be at least 0.04 mm, and if the thickness is less than 0.04 mm, its diffuse reflection characteristics may be affected. More preferably, the thickness of the diffuse reflection glass layer S1 is between 0.08 mm and 0.12 mm, for example, 0.09 mm, 0.10 mm, 0.11 mm, 0.082 to 0.112 mm, 0.093 to 0.108 mm, or the like.
  • the diffuse reflection glass layer S1 is a mixed layer of white particles and glass powder. Since the glass layer is transparent, it can be regarded as a void having a refractive index greater than 1, and light is scattered/reflected at the interface between the white particles and the glass. .
  • the thickness of the diffuse reflection glass layer S1 is too small, there is a possibility that the laser light directly penetrates the diffuse reflection glass layer S1 without scattering, so that the emitted light still has a certain coherence.
  • any ceramic substrate having a reflectance substantially higher than that of an aluminum nitride ceramic (a blue light reflectance of aluminum nitride, which is reddish to the reflected light of white light) can be used as the present invention.
  • Such a ceramic substrate is one of, for example, an alumina ceramic substrate, a zirconia ceramic substrate, a boron nitride ceramic substrate, or a zirconia-doped alumina composite ceramic substrate. More preferably, one of an alumina ceramic substrate and a zirconia-doped alumina composite ceramic substrate. Most preferred is a composite ceramic substrate of zirconia doped alumina. In one embodiment of the present invention, a composite ceramic of zirconia-doped alumina is used as the ceramic substrate S3.
  • the thickness of the ceramic substrate is not particularly limited, but in order to provide sufficient mechanical strength, the thickness of the ceramic substrate is preferably more than 0.5 mm, for example, 0.6 mm, 0.8 mm, 1.0 mm, 2.0 mm, 5.0 mm, 0.7 to 3 mm, or the like. If the thickness of the ceramic substrate is less than 0.5 mm, the mechanical strength is poor and it is easily damaged.
  • the blue light reflection performance of the reflection device of the present invention and the reflection device of the prior art and the sintered state of the diffuse reflection glass layer were compared by the following examples and comparative examples.
  • the results show that the reflection device of the present invention not only solves the problem of cracking when the diffuse reflection glass layer is thick, but also does not change its diffuse reflection characteristics.
  • the diffuse reflection glass layer S1 was composed of alumina (particle diameter of 0.1 to 1 ⁇ m) as white particles, and silicate glass was composed of glass-bonded particles, in which the examples and comparative examples were diffused.
  • the reflective glass layer S1 is made of the same material, except that the thickness of the diffuse reflection glass layer S1 is different.
  • the ceramic substrate S2 is selected from an aluminum nitride ceramic; the ceramic substrate S3 is selected from a composite ceramic of zirconia-doped alumina.
  • the prior device is a diffuse reflective glass layer S1 + aluminum nitride ceramic combination.
  • Table 1 shows the data of the reflectance devices of the examples and the comparative examples in terms of S1 thickness, blue light power, power ratio (based on the calculation of the existing device), and the state of sintering of the diffuse reflection glass layer.
  • the blue light is irradiated with the same power and then the reflected light is collected.
  • the blue light power in the list is the power of the reflected light.
  • the ratio in the list is the ratio of the reflected light blue power of the reflecting device to the blue power of the existing device.
  • Example / Comparative Example Device name S1 thickness (mm) Blu-ray power ratio Diffuse reflective glass layer sintered state Existing device 0.18-0.20 53.26 100% Cracking
  • New device 1# ( S1+S3 ) 0.041-0.042 52.25 98.10% complete
  • Comparative example 1 Comparison device 1# ( S1+S2 ) 0.041-0.042 50.5 94.8% complete
  • Example 2 New device 2# ( S1+S3 ) 0.085-0.086 53.22 99.92% complete Comparative example 2 Comparison device 2# ( S1+S2 ) 0.085-0.086 52 97.10% complete
  • the S1 thickness of the existing device is relatively large, although the blue light power is higher, but the diffuse reflection glass layer is easy to crack; the S1 thickness of the comparative example 1-3 is small, although the diffuse reflection glass layer will not crack, but the blue light The power is too low to meet the performance requirements; while the thickness of S1 of Examples 1-3 is small, the diffuse reflection glass layer does not crack and the blue light power is high, which can meet the performance requirements.
  • the present invention also provides a wavelength conversion device including the above-mentioned reflection device, as shown in FIG. 3, comprising a light-emitting layer S4 and a reflective layer, wherein the reflective layer comprises the reflection device of the above embodiment, and the reflective layer is composed of a diffuse reflection glass layer S1. It is composed of a ceramic substrate S3.
  • the luminescent layer includes a wavelength converting material for converting light incident on the luminescent layer into light of different wavelengths.
  • the luminescent layer may be a fluorescent glass obtained by sintering a phosphor and a glass frit, or may be a fluorescent ceramic. In some applications where the incident light intensity is not high, the luminescent layer may also be a quantum dot luminescent layer or an organic phosphor layer composed of phosphor and silica gel.
  • the utility model also provides a color wheel, as shown in FIG. 4, comprising a wavelength conversion region S5 and a reflection region S6, the two regions being spliced to form a circular ring on the surface of the color wheel.
  • the reflective region includes the reflective device in the above embodiment, that is, a two-layer structure composed of a diffuse reflection glass layer and a ceramic substrate, and the wavelength conversion region includes a light-emitting layer and a reflective layer.
  • the reflective layer of the wavelength conversion region may be the reflection device (the two-layer structure composed of the diffuse reflection glass layer and the ceramic substrate) in the above embodiment, or may be another reflection device.
  • the reflective layer of the wavelength conversion region may be a single-layer structure of the single ceramic substrate S3, because the light-emitting layer of the wavelength conversion region itself has a scattering function, and the diffuse reflection glass layer S1 is not required to be further enhanced.
  • the scattering effect is such that the surface of the light-emitting layer of the wavelength conversion region is flush with the surface of the diffuse reflection glass layer of the reflective region.
  • the utility model also improves a light source system, comprising the above color wheel, further comprising an excitation light source and a driving device, wherein the excitation light source emits excitation light to illuminate the color wheel, and the driving device drives the color wheel to rotate, so that the wavelength conversion on the color wheel The region and the reflective region are periodically in the illumination of the excitation light, thereby emitting light of different wavelengths.

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  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

一种反射装置及相关波长转换装置、色轮和光源系统，其中反射装置包括陶瓷基板（S3）以及位于陶瓷基板（S3）的第一表面上的漫反射玻璃层（S1），漫反射玻璃层（S1）包括远离陶瓷基板（S3）的第二表面，陶瓷基板（S3）是致密结构陶瓷体；对于相同的入射光，第一表面形成的反射光的立体发散角小于第二表面形成的反射光的立体发散角；漫反射玻璃层（S1）的厚度介于0.04mm～0.15mm之间。该反射装置既解决了漫反射玻璃层较厚时产生开裂的问题，又不会改变其漫反射特性。

Description

一种反射装置及相关波长转换装置、色轮和光源系统 技术领域
本实用新型涉及照明及显示技术领域，尤其涉及一种反射装置及相关波长转换装置、色轮和光源系统。
 背景技术
在现有的激光显示技术下，随着激光功率的逐渐提高，反射装置由于吸收激光而产生的热量越来越大，严重影响显示装置的使用寿命，因此市场上对反射装置的反射率要求越来越高。
现有技术中，存在一种致密结构的高反射陶瓷体，这种高反射陶瓷体的反射率较高，能够达到使用要求。然而，由于激光是相干光，经该种高反射陶瓷体反射后的光仍然保持一定的相干性，使得在显示图像中容易产生散斑，从而严重影响用户体验。
为此，研发人员研究出另一种反射装置结构，如图1所示，包括由白色颗粒（例如氧化铝、氧化钛和氧化锆等较高白度的粒子）和玻璃（例如硅酸盐玻璃、硼酸盐玻璃等）玻璃体构成的漫反射玻璃层S1和用于承载漫反射玻璃层S1并用于散热的氮化铝陶瓷衬底S2。这种反射装置结构由于玻璃是透明的，激光能够进入漫反射玻璃层内部多次散射反射后出射，其漫反射特性比致密结构的高反射陶瓷仅发生在表面层的反射要好很多。在该反射结构中，氮化铝陶瓷衬底S2的反射率不高，其主要作用是作为漫反射玻璃层S1的制备和使用过程中的承载和散热基板，因此反射率主要由漫反射玻璃层S1提供。达到满足应用的反射率，漫反射玻璃层的厚度需要足够后。然而，由于漫反射玻璃层与陶瓷承载衬底的热膨胀系数不同，在烧结过程中过厚的漫反射玻璃层容易开裂，使得该反射结构的良品率很低。因此，一种新型的反射装置亟待开发。
 技术问题
本实用新型提供一种既解决了漫反射玻璃层开裂问题又不会改变其漫反射特性的反射装置，并在此基础上提供相关波长转换装置、色轮和光源系统。
技术解决方案
本实用新型通过如下技术方案实现：
根据本实用新型的第一方面，本实用新型提供一种反射装置，包括陶瓷基板，还包括位于上述陶瓷基板的第一表面上的漫反射玻璃层，上述漫反射玻璃层包括远离上述陶瓷基板的第二表面，上述陶瓷基板是致密结构陶瓷体；
对于相同的入射光，上述第一表面形成的反射光的立体发散角小于上述第二表面形成的反射光的立体发散角，其中，一光束的立体发散角为该光束的光照强度不小于该光束中心光照强度的50%的区域围成的立体角；
上述漫反射玻璃层的厚度介于0.04mm~0.15mm之间。
作为本实用新型的优选方案，上述漫反射玻璃层的厚度介于0.08mm~0.12mm之间。
作为本实用新型的优选方案，上述漫反射玻璃层为白色颗粒和玻璃组成的漫反射层。
作为本实用新型的优选方案，上述陶瓷基板的孔隙率小于等于15%。
作为本实用新型的优选方案，上述陶瓷基板选自氧化铝陶瓷基板、氧化锆陶瓷基板、氮化硼陶瓷基板、氧化锆掺杂氧化铝的复合陶瓷基板中的一种。
作为本实用新型的优选方案，上述陶瓷基板是氧化锆掺杂氧化铝的复合陶瓷基板。
作为本实用新型的优选方案，上述陶瓷基板的厚度大于0.5mm。
根据本实用新型的第二方面，本实用新型提供一种波长转换装置，包括发光层和反射层，其中，上述反射层包括如第一方面的反射装置，上述发光层位于上述漫反射玻璃层的第二表面上，上述发光层用于将入射于该发光层的光转换为不同波长的光。
根据本实用新型的第三方面，本实用新型提供一种色轮，包括波长转换区域和反射区域，其中上述反射区域包括如第一方面的反射装置，上述波长转换区域与上述反射区域在色轮表面拼接形成圆环状。
根据本实用新型的第四方面，本实用新型提供一种光源系统，包括如第三方面的色轮，还包括一激发光源和驱动装置，上述激发光源用于发射激发光照射到上述色轮上，上述驱动装置用于驱动上述色轮转动，以使上述色轮上的波长转换区域和反射区域周期性地接收激发光的照射。
 有益效果
本实用新型的反射装置，将表面反射光的立体发散角较小的陶瓷基板与表面反射光的立体发散角较大的漫反射玻璃层结合，由于该陶瓷基板的表面反射光立体发散角小，其致密度高于漫反射玻璃层中非玻璃部分的致密度，使得该陶瓷基板具有较高的反射率，用此致密结构陶瓷体代替现有的氮化铝基板，从而即使减薄漫反射玻璃层的厚度也不会影响整体的反射率。本实用新型利用陶瓷基板和漫反射玻璃层的复合发射结构既解决了漫反射玻璃层较厚时产生开裂的问题，又保证了反射装置具有良好的漫反射特性。
附图说明
图1为现有技术中的反射装置的结构示意图；
图2为本实用新型一个实施例的反射装置的结构示意图；
图3为本实用新型一个实施例的波长转换装置的结构示意图；
图4为本实用新型一个实施例的色轮的结构示意图。
附图标记说明：
S1：漫反射玻璃层；
S2：陶瓷衬底；
S3：陶瓷基板；
S4：发光层；
S5：波长转换区域；
S6：反射区域。
 本发明的最佳实施方式
下面通过具体实施方式结合附图对本实用新型作进一步详细说明。
图1示出了现有技术中的一种反射装置的结构，包括烧结在高反射基板上的漫反射玻璃层S1和用于烧结漫反射玻璃层S1的陶瓷衬底S2。其中，漫反射玻璃层S1一般由白色颗粒（例如氧化铝、氧化钛和氧化锆等较高白度的粒子）和玻璃（例如硅酸盐玻璃、硼酸盐玻璃等）构成；陶瓷衬底S2一般是氮化铝陶瓷。漫反射玻璃层S1的厚度在0.15mm以上，在烧结过程中由于S1太厚，会导致漫反射玻璃层开裂。
针对现有技术中漫反射玻璃层过厚而容易开裂的问题，本实用新型提供了一种新型的反射装置。图2示出了本实用新型一个实施例的反射装置的结构，其包括陶瓷基板S3和陶瓷基板S3上的漫反射玻璃层S1，其中陶瓷基板S3是致密结构陶瓷体。漫反射玻璃层S1位于陶瓷基板S3的第一表面上，漫反射玻璃层S1还包括远离陶瓷基板S3的第二表面，该第二表面即为反射装置的光入射面。对于相同的入射光，上述第一表面形成的反射光的立体发散角小于上述第二表面形成的反射光的立体发散角，其中，光束的立体发散角为该光束的光照强度不小于该光束中心光照强度的50%的区域围成的立体角，第一表面的立体发散角较小，意味着第一表面的漫反射性能较差，同时也意味着陶瓷基板的致密度高。
本实用新型中，用作陶瓷基板的致密结构陶瓷体的孔隙率一般优选在15%以下，这样的孔隙率能够保证较高的反射率。同时，陶瓷基板的致密度高，也意味着其导热性能相比同材料的低致密度陶瓷更好，弥补了因替换掉高热导率的氮化铝陶瓷而带来的导热性能下降的问题。一般而言，在陶瓷基板的材料一定的情况下，陶瓷基板的反射率与其致密度成正相关，而与孔隙率成负相关，而孔隙率与漫反射性能呈正相关，因此陶瓷基板的反射率与漫反射性能呈反比。因此，孔隙率越低越有利于反射率的提高，本实用新型的优选方案选用孔隙率在15%以下的陶瓷基板，保证反射率足够高，因此不需要增加漫反射玻璃层的厚度，并且厚度介于0.04mm~0.15mm之间的漫反射玻璃层足以提供所需要的漫反射性能。本实用新型中，孔隙率按照本领域中的通常定义，即指块状材料中孔隙体积与材料在自然状态下总体积的百分比。
本实用新型采用致密结构的高反射率陶瓷基板（反射率高于氮化铝陶瓷的反射率）替代现有的氮化铝陶瓷，从而提高反射率。然后将漫反射玻璃层S1的厚度减薄，解决漫反射玻璃层开裂问题，由于陶瓷基板的反射率提高，即使减薄漫反射玻璃层，但整体反射率不受影响，而且散射角度也满足要求。
本实用新型中，漫反射玻璃层S1在致密结构陶瓷体基板上，与现有技术相同，漫反射玻璃层S1也是由白色颗粒（例如氧化铝、氧化钛和氧化锆等较高白度的粒子）和玻璃（例如硅酸盐玻璃、硼酸盐玻璃等）构成，所不同的是本实用新型中漫反射玻璃层S1的厚度小于0.15mm，具体地介于0.04mm~0.15mm之间。当漫反射玻璃层的厚度大于0.15mm时，由于漫反射玻璃层的热膨胀系数与陶瓷基板的热膨胀系数差异较大，在热应力的作用下，漫反射玻璃层容易在是不过程中发生开裂现象。
一般而言，本实用新型中的漫反射玻璃层S1的厚度至少应该是0.04mm，如果厚度小于0.04mm，可能会影响其漫反射特性。更优选地，漫反射玻璃层S1的厚度介于0.08mm~0.12mm之间，例如0.09mm、0.10mm、0.11mm、0.082~0.112mm、0.093~0.108mm等。在本实用新型中，漫反射玻璃层S1为白色颗粒与玻璃粉的混合层，由于玻璃层是透明的，可以看作为折射率大于1的空隙，光在白色颗粒与玻璃的界面发生散射/反射。因此，在白色颗粒与玻璃的体积比相同的情况下，漫反射玻璃层S1的厚度越大，光在漫反射玻璃层S1中经历的散射/反射的次数越多，激光被消相干的程度越大。当漫反射玻璃层S1的厚度太小的时候，有可能有激光不经过散射而直接穿透漫反射玻璃层S1，使得出射光仍具有一定的相干性。
基于本实用新型的原理，任何反射率大体上高于氮化铝陶瓷（氮化铝的蓝光反射率差，其对白光的反射光偏红）的反射率的陶瓷基板均可作为本实用新型的陶瓷基板S3。这样的陶瓷基板，例如氧化铝陶瓷基板、氧化锆陶瓷基板、氮化硼陶瓷基板、氧化锆掺杂氧化铝的复合陶瓷基板中的一种。更优选，氧化铝陶瓷基板和氧化锆掺杂氧化铝的复合陶瓷基板中的一种。最优选，氧化锆掺杂氧化铝的复合陶瓷基板。在本实用新型的一个实施例中，以氧化锆掺杂氧化铝的复合陶瓷作为陶瓷基板S3。
一般而言，陶瓷基板的厚度没有特别限制，但是为了提供足够的机械强度，陶瓷基板的厚度优选大于0.5mm，例如0.6mm、0.8mm、1.0mm、2.0mm、5.0mm、0.7~3mm等。如果陶瓷基板的厚度小于0.5mm，其机械强度较差，容易损坏。
以下通过实施例和对比例，比较本实用新型的反射装置和现有技术中的反射装置的蓝光反射性能和漫反射玻璃层烧结状态。结果显示，本实用新型的反射装置既解决了漫反射玻璃层较厚时产生开裂的问题，又不会改变其漫反射特性。
以下实施例和对比例中，漫反射玻璃层S1是由氧化铝（粒径0.1~1微米）作为白色颗粒，硅酸盐玻璃作为玻璃粘接粒子构成的，其中实施例和对比例中的漫反射玻璃层S1均采用相同的材料，所不同的是漫反射玻璃层S1的厚度不同。陶瓷衬底S2选用氮化铝陶瓷；陶瓷基板S3选用氧化锆掺杂氧化铝的复合陶瓷。现有装置是漫反射玻璃层S1+氮化铝陶瓷组合。
表1示出了实施例和对比例的反射装置在S1厚度、蓝光功率、功率比值（以现有装置作为计算基础）以及漫反射玻璃层烧结状态方面的数据。利用相同功率的蓝光照射反射装置，然后收集反射光，列表中的蓝光功率即为反射光的功率，列表中的比值为反射装置的反射光蓝光功率相对于现有装置的蓝光功率的比值。
表 1
实施例 / 对比例 装置名称 S1 厚度（ mm ） 蓝光功率 比值 漫反射玻璃层烧结状态
现有装置 0.18-0.20 53.26 100% 开裂
实施例 1 新型装置 1# （ S1+S3 ） 0.041-0.042 52.25 98.10% 完整
对比例 1 对比装置 1# （ S1+S2 ） 0.041-0.042 50.5 94.8% 完整
实施例 2 新型装置 2# （ S1+S3 ） 0.085-0.086 53.22 99.92% 完整
对比例 2 对比装置 2# （ S1+S2 ） 0.085-0.086 52 97.10% 完整
实施例 3 新型装置 3# （ S1+S3 ） 0.125-0.127 53.3 100.08% 完整
对比例 3 对比装置 3# （ S1+S2 ） 0.125-0.127 52.8 99.13% 完整
结果表明：现有装置的S1厚度较大，虽然蓝光功率较高，但是漫反射玻璃层烧结容易开裂；对比例1-3的S1厚度较小，虽然漫反射玻璃层烧结不会开裂，但是蓝光功率偏低，不能满足性能需求；而实施例1-3的S1厚度虽然较小，但是漫反射玻璃层烧结不会开裂，并且蓝光功率较高，能够满足性能需求。此外，由实施例1-3能够看出，随着S1厚度增加，蓝光功率有明显提高，可见在漫反射玻璃层烧结时不开裂的前提下，提高S1厚度，有利于改善蓝光功率性能。
本实用新型还提供了一种包括上述反射装置的波长转换装置，如图3所示，包括发光层S4和反射层，其中反射层包括上述实施例的反射装置，反射层由漫反射玻璃层S1和陶瓷基板S3组成。发光层包括波长转换材料，用于将入射于该发光层的光转换为不同波长的光。发光层可以是荧光粉和玻璃粉烧结而成的荧光玻璃，也可以是荧光陶瓷。在一些入射光强度不高的应用场景，发光层还可以是量子点发光层或者荧光粉和硅胶组成的有机荧光粉层。
本实用新型还提供了一种色轮，如图4所示，包括波长转换区域S5和反射区域S6，该两个区域在色轮表面拼接形成圆环形。其中，反射区域包括上述实施例中的反射装置，即为漫反射玻璃层与陶瓷基板组成的二层结构，波长转换区域包括发光层和反射层。其中，波长转换区域的反射层既可以为上述实施例中的反射装置（漫反射玻璃层与陶瓷基板组成的二层结构），也可以为其它的反射装置。例如，本实施例色轮中，波长转换区域的反射层可以为单独的陶瓷基板S3单层结构，这是由于波长转换区域的发光层本身具有散射功能，无需进一步增加漫反射玻璃层S1来增强散射效果，这样也可以使得波长转换区域的发光层表面与反射区域的漫反射玻璃层表面相平齐。
本实用新型还提高了一种光源系统，包括上述色轮，还包括一激发光源和驱动装置，激发光源发出激发光照射在色轮上，驱动装置驱动色轮转动，使得色轮上的波长转换区域和反射区域周期性地处于激发光的照射中，从而发出不同波长的光。
以上内容是结合具体的实施方式对本实用新型所作的进一步详细说明，不能认定本实用新型的具体实施只局限于这些说明。对于本实用新型所属技术领域的普通技术人员来说，在不脱离本实用新型构思的前提下，还可以做出若干简单推演或替换，都应当视为属于本实用新型的保护范围。

Claims (10)

1. 一种反射装置，包括陶瓷基板（S3），其特征在于，还包括位于所述陶瓷基板（S3）的第一表面上的漫反射玻璃层（S1），所述漫反射玻璃层（S1）包括远离所述陶瓷基板（S3）的第二表面，所述陶瓷基板（S3）是致密结构陶瓷体；
对于相同的入射光，所述第一表面形成的反射光的立体发散角小于所述第二表面形成的反射光的立体发散角，其中，一光束的立体发散角为该光束的光照强度不小于该光束中心光照强度的50%的区域围成的立体角；
所述漫反射玻璃层（S1）的厚度介于0.04mm~0.15mm之间。
2. 根据权利要求1所述的反射装置，其特征在于，所述漫反射玻璃层（S1）的厚度介于0.08mm~0.12mm之间。
3. 根据权利要求1或2所述的反射装置，其特征在于，所述漫反射玻璃层为白色颗粒和玻璃组成的漫反射层。
4. 根据权利要求1所述的反射装置，其特征在于，所述陶瓷基板（S3）的孔隙率小于等于15%。
5. 根据权利要求1所述的反射装置，其特征在于，所述陶瓷基板（S3）选自氧化铝陶瓷基板、氧化锆陶瓷基板、氮化硼陶瓷基板、氧化锆掺杂氧化铝的复合陶瓷基板中的一种。
6. 根据权利要求5所述的反射装置，其特征在于，所述陶瓷基板（S3）是氧化锆掺杂氧化铝的复合陶瓷基板。
7. 根据权利要求4-6任一项所述的反射装置，其特征在于，所述陶瓷基板（S3）的厚度大于0.5mm。
8. 一种波长转换装置，包括发光层和反射层，其中，所述反射层包括如权利要求1~7中任一项所述的反射装置，所述发光层位于所述漫反射玻璃层（S1）的第二表面上，所述发光层用于将入射于该发光层的光转换为不同波长的光。
9. 一种色轮，包括波长转换区域和反射区域，其中所述反射区域包括如权利要求1~7中任一项所述的反射装置，所述波长转换区域与所述反射区域在色轮表面拼接形成圆环状。
10. 一种光源系统，包括如权利要求9所述的色轮，还包括一激发光源和驱动装置，所述激发光源用于发射激发光照射到所述色轮上，所述驱动装置用于驱动所述色轮转动，以使所述色轮上的波长转换区域和反射区域周期性地接收激发光的照射。
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