CN104595852B - A kind of Wavelength converter, diffusing reflection layer, light-source system and optical projection system - Google Patents
A kind of Wavelength converter, diffusing reflection layer, light-source system and optical projection system Download PDFInfo
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- CN104595852B CN104595852B CN201310526547.0A CN201310526547A CN104595852B CN 104595852 B CN104595852 B CN 104595852B CN 201310526547 A CN201310526547 A CN 201310526547A CN 104595852 B CN104595852 B CN 104595852B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
- G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
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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
- F21V7/00—Reflectors for light sources
- F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/007—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light
- G02B26/008—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light in the form of devices for effecting sequential colour changes, e.g. colour wheels
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0284—Diffusing elements; Afocal elements characterized by the use used in reflection
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0294—Diffusing elements; Afocal elements characterized by the use adapted to provide an additional optical effect, e.g. anti-reflection or filter
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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
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Abstract
The embodiment of the invention discloses a kind of Wavelength converter, diffusing reflection layer, light-source system and optical projection system.Described Wavelength converter includes containing fluorescent material to realize the fluorescence coating of wavelength convert, also include the diffusing reflection layer being attached on the shady face of described fluorescence coating, described diffusing reflection layer includes that white scattering particles and the first bonding agent of bonding described white scattering particles, the refractive index of described white scattering particles are more than 1.2 with the ratio of the refractive index of described first bonding agent.Using the present invention, diffusing reflection layer can realize high reflectance in the case of relatively thin, and relatively thin diffusing reflection layer is conducive to shortening the heat conduction path of luminescent layer, thus improves the heat endurance of Wavelength converter.
Description
Technical field
The present invention relates to illumination and Display Technique field, particularly relate to a kind of Wavelength converter,
Diffusing reflection layer, light-source system and optical projection system.
Background technology
At present, blue laser excites the colour wheel of High Rotation Speed to can effectively solve the problem that the thermal quenching of fluorescent material
Problem and the laser display of high efficiency, low cost is become a reality, be developing progressively as LASER Light Source
One of mainstream technology,
In this kind of scheme, light source includes excitation source and Wavelength converter, wherein wavelength convert
Device includes reflective substrate and the phosphor sheet being coated in reflective substrate, and is used for driving reflection
The motor of substrate rotation so that the hot spot that the exciting light from excitation source is formed on phosphor sheet
This phosphor sheet is acted on by circular path.
The reflective substrate of LASER Light Source uses specular aluminium at present, and the high reflection layer in specular aluminium uses height
Fine aluminium or high purity silver, its bonding aluminum oxide with aluminium base is as affine layer.At high reflection layer
Dielectric layer such as MgF on plated surface2、SiO2Deng, protection and enhancing in order to rafifinal/silver layer are anti-
Penetrate effect.
This mirror-surface aluminum base board there is the problem that high reflective silver layer higher for reflectivity comes
Saying, in use, silver atoms is easy to and the hydrogen sulfide in air, oxygen etc. vulcanizes,
Oxidation reaction and make reflectivity and heat endurance drastically reduce；For high reflective aluminum, aluminium
Stability is higher than silver, but reflectivity is the highest.
Therefore, under state-of-the-art, for the reflectivity of aluminium base to be taken into account and heat endurance,
Have to look for other more effective ways, have researcher to pass through sputtering or plasma-reinforced chemical gas
Phase deposition process solves silver at high reflective silver layer plating aluminum oxide or silicon nitride dense protective layer
Sulfuration problem, but, in order to not affect the reflectivity in reflecting layer, the thickness of protective layer is typically 10
Below nm, homogeneity is difficult to ensure that, technique is complex.
Summary of the invention
The embodiment of the present invention is mainly solving the technical problems that to provide a kind of reflector thickness thin, anti-
Penetrate rate height and the most also there is the Wavelength converter of good thermal stability, diffusing reflection layer, light-source system
And optical projection system.
Embodiments provide a kind of Wavelength converter, including containing fluorescent material to realize ripple
The fluorescence coating of long conversion, also includes the diffusing reflection layer being attached on the shady face of described fluorescence coating, institute
State diffusing reflection layer and include white scattering particles and the first bonding agent of bonding described white scattering particles,
The refractive index of described white scattering particles is more than 1.2 with the ratio of the refractive index of described first bonding agent.
Further, the refractive index of described white scattering particles and the refractive index of described first bonding agent
Ratio be not less than 1.25.
Further, the refractive index of described white scattering particles is more than 1.7.
Further, described white scattering particles includes alumina powder, magnesium oxide powder, nitridation
In boron powder, yttrium oxide powder, Zinc oxide powder, titanium dioxide powder, Zirconium oxide powder at least
A kind of.
Further, the particle diameter of described white scattering particles is between 0.1～10 micron.
Further, the particle diameter of described white scattering particles is between 0.2～0.5 micron.
Further, described white scattering particles and the volume ratio of described first bonding agent are more than 0.4.
Further, the thickness of described diffusing reflection layer is less than 0.2 millimeter.
Further, described first bonding agent is organic adhesive, described organic adhesive be silica gel,
Any one or more in epoxy resin.
Further, described first bonding agent is inorganic adhesive, described inorganic adhesive be glass,
Any one or more in waterglass, low-temperature glaze.
Further, described fluorescence coating includes described fluorescent material and the second of bonding described fluorescent material
Bonding agent.
Further, described Wavelength converter also includes heat-conducting substrate, and described fluorescence coating is anti-with unrestrained
Penetrate layer to be all attached on described heat-conducting substrate one side surface, and described diffusing reflection layer is positioned at described heat conduction
Between substrate and described fluorescence coating.
Further, described first bonding agent and the second bonding agent are glass, and described second glues
Connect the thermal coefficient of expansion thermal coefficient of expansion less than or equal to described first bonding agent of agent.
Further, described fluorescence coating is the fluorescence ceramics containing fluorescent material.
The present invention also provides for a kind of diffusing reflection layer, for reflecting light, including white scattering particles and
First bonding agent of bonding described white scattering particles, the refractive index of described white scattering particles and institute
State the ratio of refractive index of the first bonding agent more than 1.2.
The present invention also provides for a kind of light-source system, including light source and above-mentioned Wavelength converter, institute
State the side to light side that light source is positioned at the fluorescence coating of described Wavelength converter so that described light source is sent out
The exciting light gone out carries out wavelength convert through described fluorescence coating, and by overflowing on described fluorescence coating shady face
Reflecting layer is reflected.
The present invention also provides for a kind of optical projection system, for projection imaging, has light source as above
System.
Compared with prior art, the embodiment of the present invention has the advantages that
1. the white scattering particles and first that diffusing reflection layer uses refractive index to meet certain ratio condition glues
Connect agent composition, visible ray is had higher reflectivity, so diffusing reflection layer can be relatively thin
In the case of realize high reflectance, relatively thin diffusing reflection layer and then be conducive to the heat shortening luminescent layer to pass
Guiding path, thus improve the heat endurance of Wavelength converter.
2. higher due to diffusing reflection layer reflectivity, it is not affected by the reflectivity of substrate, therefore heat
Any metal or ceramic substrate that conductance is higher can meet requirement, on the one hand can avoid making
By the thermal stability problems of the silver of silver coated aluminum substrate, on the other hand, use common metal substrate permissible
Reduce cost.
Accompanying drawing explanation
Fig. 1 is the sectional view of the first embodiment of Wavelength converter of the present invention；
Fig. 2 is the top view of the second embodiment of Wavelength converter of the present invention；
Fig. 3 be Wavelength converter shown in Fig. 1 partly cut open front view；
Fig. 4 is the top view of the 3rd embodiment of Wavelength converter of the present invention.
Detailed description of the invention
With embodiment, the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.
Refer to the first embodiment of the Wavelength converter shown in Fig. 1.As it is shown in figure 1, wavelength
Conversion equipment includes being cascading and fixing fluorescence coating 3, diffusing reflection layer 2, heat-conducting substrate 1.
Fluorescence coating 3 is containing fluorescent material.The exciting light with particular range of wavelengths sent when light source from
Fluorescence coating 3 is incident towards the side to light S2 of light source and is irradiated on fluorescent material, and fluorescent material can be inhaled
Receive exciting light and be excited to produce the light being different from excitation wavelength, it is achieved wavelength convert function.This
Bright fluorescent material such as YAG(yttrium-aluminium-garnet) fluorescent material, YAG fluorescent powder can absorb indigo plant
Light, ultraviolet light etc. and produce yellow Stimulated Light.Additionally, fluorescent material can also is that red light fluorescent powder,
Green light fluorescent powder etc..
Diffusing reflection layer 2 is attached on the shady face S1 being parallel to side to light S2 of fluorescence coating 3, and
Between heat-conducting substrate 1 and fluorescence coating 3, for incident light is reflected.Diffusing reflection layer 2
Including particle diameter white scattering particles between 0.1～10 micron with for white scattering particles is glued
The first bonding agent connect.White scattering particles refer to reflect most of color visible ray, from
And it is apparent upper for white particle, generally salt or oxide-based powder, such as alumina powder
End, magnesium oxide powder, boron nitride powder, yttrium oxide powder, Zinc oxide powder, titanium dioxide powder,
Zirconium oxide powder etc..These white scattering particles absorb essentially without to light, and character
Stable, will not at high temperature aoxidize.Preferable radiating effect is needed, preferably in view of diffusing reflection layer
Ground selects the alumina powder that thermal conductivity is higher.
Heat-conducting substrate 1 can be metal, it is also possible to be that heat conductivility is the most ceramic, thus by glimmering
The heat that photosphere 3 and diffusing reflection layer 1 receive exciting light and produce conducts and sheds.Although metal
Thermal conductivity is the highest, but metal is when temperature is higher than the half of its melting temperature, and metal is it is possible to meeting
Temperature distortion, such as aluminium sheet, steel plate, copper coin etc..Therefore, heat-conducting substrate 1 preferably employs heat conduction
Coefficient is more than or equal to 80W/mK, fusing point ceramic material more than 1500 DEG C, is realizing heat conduction
At the same time it can also be the temperature that tolerance is higher.This heat-conducting substrate is essentially all the pottery of compact texture
Porcelain plate, such as aluminium nitride, silicon nitride, boron nitride, beryllium oxide, carborundum etc..Need explanation
It is, if the fluorescence coating of the present invention 3 and diffusing reflection layer 2 are directly to be prepared into a concrete application product
On, it is also possible to not having heat-conducting substrate 1, application product such as light emitting diode, light fixture is reflective
Plate etc..
The diffusing reflection layer that the Wavelength converter of the present invention utilizes white scattering particles to constitute replaces
Traditional specular aluminium film, silverskin or minute surface aluminium sheet.By white scattering particles, incident light is dissipated
Penetrate, it is achieved that the reflection to incident light.And white scattering particles will not aoxidize and absorb incident photoconduction
Cause reflectance reduction, the most also can tolerate higher temperature.
For the reflecting layer that above-mentioned mirror metal film or metallic plate etc. are constituted, its surface ratio relatively light
Sliding, when fluorescence coating is after the surface forming in mirror metal reflecting layer, and fluorescence coating contacts with reflecting layer
Surface can be shunk, and part separates with reflecting layer so that the contact area in fluorescence coating and reflecting layer is relatively
Little, interface resistance the most therebetween is bigger.In the present embodiment, owing to ceramic substrate is with unrestrained
The surface in reflecting layer is the most coarse, therefore, between fluorescence coating and diffusing reflection layer, diffusing reflection
Layer is bigger with the contact area between ceramic substrate so that after Wavelength converter shaping
Interface resistance is less, thus improves heat conduction efficiency.
In actual application, in order to be molded diffusing reflection layer 2, white scattering particles needs with first bonding
Agent is bonding and is solidified into an overall Rotating fields.In order to not affect the incidence of light, the first bonding agent
Should be transparent material, i.e. light transmittance is higher than 90%.First bonding agent can be organic adhesive, example
Such as the cooperation of one or more in silica gel, epoxy resin etc., it is also possible to be inorganic adhesive, example
Such as the cooperation of one or more in glass, waterglass, low-temperature glaze etc..
The first bonding agent relatively often used is silica gel, its stable chemical nature, has higher machinery strong
Degree.During preparation diffusing reflection layer, white scattering particles and silica gel are prepared also according to certain volume ratio
Mix, be coated to heat-conducting substrate 1 surface, be heating and curing and i.e. can get diffusing reflection layer 2.
Owing to the tolerable temperature of silica gel is relatively low, typically at 250 degrees Celsius to 300 degrees Celsius.Cause
In the applied environment that this is big at some light source powers, require resistance to elevated temperatures, the most bonding in vain
First bonding agent of chromatic dispersion particle is glass.When preparing this diffusing reflection layer 2, first obtain this glass
Corresponding glass dust, glass dust is the glass isotropic body of a kind of amorphous granular shape, and its transparency is high
And stable chemical nature, such as silicate glass, borosilicate, lead silicate glass, aluminium borosilicate
Silicate glass, aluminate glass, soda-lime glass, quartz glass etc..By glass dust and white scattering
Particle puts into ethylene glycol, PVB(polyvinyl butyral resin), ethanol, dimethylbenzene, ethyl cellulose
Element, terpineol, butyl carbitol, in acetate of butyl carbitol one or at least two are mixed
Zoarium etc. has mixing in the organic carrier of mobility, is coated to by mixed slurry on heat-conducting substrate 1,
Now heat-conducting substrate 1 preferably ceramic substrate, the most integrally sintered.By sintering, glass dust
Glass it is solidified into after Rong Rong, the substantially all volatilization of organic carrier or decomposition, ceramic substrate is formed
There is between diffusing reflection layer 2, and ceramic substrate and diffusing reflection layer 2 the strongest adhesion.
Being similar to, fluorescent material carries out bonding by the second bonding agent and forms fluorescence coating 3.Second glues
Connecing agent can be organic adhesive, it is also possible to be inorganic adhesive, the selection of the second bonding agent and right
The preparation method answered can be found in the corresponding description of above-mentioned diffusing reflection layer 2.
Preferably, the second bonding agent of fluorescence coating 3 and the first bonding agent of diffusing reflection layer 2 are glass
Glass, is sintered by the glass dust of similar and different material and obtains.In order on the diffusing reflection layer 2 of shaping
The structure of diffusing reflection layer 2, the glass of the second bonding agent is not interfered with when brushing and fire fluorescence coating 3
Softening point should be not higher than the glass softening point of the first bonding agent, simultaneously the thermal expansion system of the second bonding agent
Number is less than or equal to the thermal coefficient of expansion of the first bonding agent, to avoid drawing in phosphor powder layer sintering process
Split diffusing reflection layer, reduce the bonding force with substrate.
Glass in diffusing reflection layer 2 and fluorescence coating 3 is required to transmission exciting light and the most also to conduct
Heat, therefore preferably employs pyrex, pyrex stable in properties, and transmitance is high, and
And relative to other glass, there is higher thermal conductivity.
The diffusing reflection layer consisted of white scattering particles and the first bonding agent substitutes traditional minute surface
The thermal stability problems of silver can be fundamentally avoided in reflecting layer, it is also possible to improve the heat of reflection substrate
Stability, but the reflectance mechanism of this diffusing reflection layer is to specific light wave by white scattering particles
Multiple Scattering-reflection produce, diffusing reflection layer to reach higher diffusing reflection rate, and its film layer is necessary
Reach higher caliper, it is generally required to the thickness of more than 0.2mm, and this thickness is relative to mirror-like silver
For the medium protective layer hundreds of nanometers thickness on surface, such thickness can increase fluorescence coating and produce
The conducting path of heat, thus have higher thermal resistance, the heat endurance of Wavelength converter is by this
Disadvantageous.
The present invention is by optimizing design white scattering particles and the composition of the first bonding agent so that unrestrained anti-
Penetrate layer in the case of less than 0.2mm thickness, remain to whole visual field is kept higher diffusing reflection
Rate such that it is able to remain to keep higher heat endurance in the case of ensureing high light effect.
As a example by white scattering particles is as alumina powder, particle diameter is the alumina powder of 0.2 micron
Refractive index is 1.76, and the first bonding agent selects refractive index to be the silica gel of 1.41, i.e. white scattering particles
Being 1.25 with the refractive indices of the first bonding agent, the two is that 0.49(volume ratio is according to volume ratio
Weighed respectively by the two, obtain respective by the weight claimed divided by respective density the most respectively
Volume, then carry out ratio and be worth to) mixing, make the diffusing reflection layer that thickness is 0.1 millimeter, survey
Obtaining it is 90% to the reflectivity of white light.
In another group test data, white scattering particles is boron nitride powder, particle diameter 0.7 micron,
Refractive index is 2.11, and the first bonding agent selects refractive index to be the silica gel of 1.41, the refractive index of the two
Ratio is 1.50, is 0.42 mixing according to volume ratio, and prepared thickness is the diffusing reflection of 0.07 millimeter
Layer, recording it to the reflectivity of white light is 96%, close to the reflectivity of minute surface aluminium sheet.
Summary experimental result and other serial experiment results, in the present invention, preferred white scatters
The refractive indices of particle and the first bonding agent is at least above 1.2, and volume ratio reaches more than 0.40,
Thickness reaches more than 0.1mm, thus can obtain the reflectivity being not less than 90%.Further, excellent
The refractive indices selecting the two is not less than 1.25, and white scattering particles uses refractive index to be more than 1.7
Particle, thus obtain more excellent reflectivity.
Further, the reflectivity of diffusing reflection layer 2 is also relevant with the content of white scattering particles, and one
For as, content is the highest, and reflectivity is the highest.But when white scattering particles too high levels, white
The gathering of scattering particles causes reflectance reduction.And it is during white scattering particles too high levels, unrestrained
Adhesion between reflecting layer and heat-conducting substrate all weakens, and denseness increases simultaneously, increases to technique preparation
Add difficulty.Therefore, in order to reach the balance of reflectivity and adhesion, preferred white scattering particles
It is more than 0.40 with the volume ratio of the first bonding agent and is less than 1.5.
Further, the reflectivity of diffusing reflection layer 2 is also relevant with its thickness, and diffusing reflection layer is the thickest,
Reflectivity is the highest；But meanwhile, diffusing reflection layer is the thickest, and heat conduction path is the longest, and its thermal resistance is the biggest,
It is unfavorable for heat transfer, and then affects the light efficiency of fluorescent material.Preferably, at diffusing reflection particle and first
Under conditions of the refractive indices of bonding agent is more than 1.2, preferably diffusing reflection layer thickness is less than 0.2mm,
Even can be less than 0.1mm, now remain to keep higher reflectivity, thermal resistance is low simultaneously.
It addition, white scattering particles in diffusing reflection layer 2 primarily serves and is scattered incident light
Effect, in order to reach more preferable dispersion effect, the particle diameter of white scattering particles is preferably 0.1～0.8
Between μm, this is owing to general particle has the highest reflection to the wavelength light of the twice of its particle diameter
Rate, this particle size range just correspond to the wave-length coverage of the visible ray of 400nm to 800nm.
If in order to enable to have white light higher reflectivity, then white scattering particles should covering visible light
Each particle diameter that wavelength is corresponding, has a different-grain diameter of 0.1 to 0.8 μm the most simultaneously, or at least
Cover the particle size range of 0.2～0.5 μm.Experiments verify that, similar white scattering particles,
Under equal surface density, condition of equivalent thickness, particle diameter is best in 0.2～0.5 μ m inscattering effect.
There is higher accumulation close in the first bonding agent in view of white scattering particles in diffusing reflection layer
Degree, the white scattering particles that the most spherical or class is spherical.
Below by way of concrete experimental data explanation inventive feature and beneficial effect.
The reflectivity of Wavelength converter is affected by the different white scattering particles of table 1. and particle diameter thereof
Investigate the impact of the white scattering particles of different-grain diameter, as seen from the above table, when white scatters grain
When seed footpath is in 0.2～0.7um scope, the reflectivity of diffusing reflection layer is higher.When particle diameter exceedes this
Scope, reflectivity is the most relatively low；In the case of same volume ratio 0.49, scattering particles is aoxidized
Aluminium, when increasing to 3～5um along with its particle diameter from 0.2～0.5, the reflectivity of diffusing reflection layer significantly drops
Low；Investigate the impact of different white scattering particles and the volume ratio of bonding agent, as shown above, instead
Rate of penetrating raises with the increase of silica gel volume ratio along with aluminum oxide (3～5um).
It addition, investigate the refractive indices of white scattering particles and the first bonding agent to diffusing reflection layer
Reflectivity affects, as seen from the above table, when white scattering particles is the oxygen that particle diameter is 0.2～0.5um
Changing aluminum particulate, choosing the silica gel that refractive index is 1.41,1.57 is bonding agent, and refractive indices is respectively
It is 1.25,1.12, and reflectivity is fallen sharply to 82.3% by 90.3%；When silica gel still selects 1.41
Refractive index, the barium sulfate of white scattering particles selection refractive index 1.64, refractive indices is 1.16,
Diffusing reflection rate is only 86.9%.Therefore preferred index ratio is not less than 1.25.
The different diffusing reflection layer thickness impact on reflectivity of table 2.
As seen from the above table, along with diffusing reflection layer thickness increases, its diffusing reflection rate has the trend of increase,
And when increasing to 0.15～0.20, the increase of reflectivity eases up, and shows this thickness range, diffusing reflection
The reflectivity of layer tends to saturated.It follows that diffusing reflection thickness is less than in the case of 0.2mm, unrestrained
Reflecting layer remains to keep higher reflectivity.
Fig. 2, Fig. 3 show the Wavelength converter of second embodiment of the invention, implement with first
Example is similar to, it may have heat-conducting substrate 1, diffusing reflection layer 2a, 2c and fluorescence coating 3a, 3b, 3c.
The description of various piece can be found in above-mentioned first embodiment and describes accordingly.
The present embodiment is with the difference of first embodiment, also has driving means 4.Heat-conducting substrate
1 is disc, is driven by driving means 4 such as the motors that is coaxially disposed and rotates around central shaft.
Diffusing reflection layer is the overall annular that same proportioning prepares, and is attached to and driving means phase
The back of the body heat-conducting substrate 1 one side surface on, and with disc heat-conducting substrate 1 concentric.
Fluorescence coating 3a, 3b, 3c are separately positioned on diffusing reflection layer, and place is at grade.Different
Fluorescence coating contain the fluorescent material of different colours.Then rotating when driving means, light source is irradiated to successively
On different fluorescence coating 3a, 3b, 3c, thus produce the Stimulated Light of different colours.In the present embodiment,
There is the fluorescent material of three kinds of different colours, form different fluorescence coatings respectively.Obviously, the present invention
As long as fluorescence coating at least has two different colors of fluorescent material and respective second bonding agent is bonding
Two the fluorescence coating sections formed, can realize producing in the present embodiment the mesh of different colours Stimulated Light
, namely constitute the colour wheel in the present embodiment.
Corresponding to each fluorescence coating 3a, 3b, 3c section, diffusing reflection layer also can be accordingly divided into three
Not shown in section 2a, 2b(figure), 2c.The characteristic of the fluorescence coating according to different colours, can divide
Different diffusing reflection layers is not set.The fluorescent material of such as fluorescence coating 3a selects silica gel bonding as second
Agent, then corresponding diffusing reflection layer 2a also selects silica gel as the first bonding agent, and the two is on other surfaces
Bonding on heat-conducting substrate in order after upper shaping；And diffusing reflection layer 2a, fluorescence coating 3a all select
With glass as bonding agent, the two is moulded directly on heat-conducting substrate 1 by sintering process, so
Designing and manufacturing technique can be optimized.
When Wavelength converter is colour wheel, light efficiency, as a part for light-source system, is proposed by it
Higher requirement, therefore compared to other products, needs more preferable light efficiency and reflectivity.And adopt
With the diffusing reflection layer of the present invention, the problem not having high-temperature oxydation due to white scattering particles, simultaneously
Good heat conductivity, therefore can obtain good light efficiency, has close with mirror metal reflecting layer simultaneously
Reflectivity.
Fig. 4 is the structural representation of third embodiment of the invention.In the present embodiment, fluorescence coating 3 is
Containing the fluorescence ceramics of fluorescent material, fluorescence ceramics be one can be excited light excite with produce be excited
The ceramic body of light, such as YAG devitrified glass, sintering YAG pottery or the Huang of other systems, green
Or red fluorescence pottery.Diffusing reflection layer 2 is attached to fluorescence ceramics by bonding or sintering process
On back light S1, other features all can be found in first embodiment and the second embodiment.
Use the scheme of fluorescence ceramics, it is possible to simplify the structure of whole colour wheel, manufacture and material cost
Can be substantially reduced.
In sum, the present invention uses the white scattering particles of high index of refraction and the first of low-refraction
The diffusing reflection layer 2 of bonding agent composition can keep higher visible ray diffusing reflection under relatively thin thickness
Rate, thus reduce its thermal resistance, beneficially fluorescence coating 3 are produced heat and are transmitted to by diffusing reflection layer 2
In heat-conducting substrate 1 or other product substrates, improve the resistance to elevated temperatures of fluorescence coating.Further, unrestrained
Reflecting layer 2 can keep good structural character and physics, chemical property, improves the entirety of product
Service life.Therefore, the present invention also protects the diffusing reflection layer related in any of the above-described embodiment, i.e.
Do not limit its range of application.
Further, based on any of the above-described kind of Wavelength converter, the present invention also protects a kind of light source
System, including the light source of generation exciting light, also includes above-mentioned Wavelength converter, and light source is positioned at
Outside the side to light of the fluorescence coating of Wavelength converter, and fluorescence coating is positioned in the light path of exciting light,
Make exciting light carry out wavelength convert through fluorescence coating and become Stimulated Light, Stimulated Light and swashing of not changed
Luminescence is reflexed to side to light outgoing by the diffusing reflection layer on shady face.
The present invention also protects a kind of optical projection system, for projection imaging, including above-mentioned light-source system.
This optical projection system can use various shadow casting technique, such as liquid crystal display (LCD, Liquid
Crystal Display) shadow casting technique, digital light path processor (DLP, Digital Light
Processor) shadow casting technique.
The foregoing is only embodiments of the present invention, not thereby limit the patent model of the present invention
Enclosing, every equivalent structure utilizing description of the invention and accompanying drawing content to be made or equivalence flow process become
Change, or be directly or indirectly used in other relevant technical fields, be the most in like manner included in the present invention's
In scope of patent protection.
Claims (15)
1. a Wavelength converter, it is characterised in that include containing fluorescent material to realize wavelength
The fluorescence coating of conversion, also includes the diffusing reflection layer being attached on the shady face of described fluorescence coating, described
Diffusing reflection layer includes white scattering particles and the first bonding agent of bonding described white scattering particles, institute
State the refractive index of the white scattering particles ratio with the refractive index of described first bonding agent more than 1.2；
The particle diameter of described white scattering particles is between 0.1～10 micron；Described first bonding agent is transparent
Material；Described white scattering particles and is less than more than 0.40 with the volume ratio of described first bonding agent
1.5；
Described white scattering particles bonding by described first bonding agent and be solidified into one overall
Rotating fields.
Wavelength converter the most according to claim 1, it is characterised in that described white
The refractive index of scattering particles is not less than 1.25 with the ratio of the refractive index of described first bonding agent.
Wavelength converter the most according to claim 1, it is characterised in that described white
The refractive index of scattering particles is more than 1.7.
Wavelength converter the most according to claim 1, it is characterised in that described white
Scattering particles includes alumina powder, magnesium oxide powder, boron nitride powder, yttrium oxide powder, oxygen
Change at least one in zinc powder, titanium dioxide powder, Zirconium oxide powder.
Wavelength converter the most according to claim 1, it is characterised in that described unrestrained anti-
Penetrate the thickness of layer less than 0.2 millimeter.
Wavelength converter the most according to claim 1, it is characterised in that described first
Bonding agent is inorganic adhesive, and described inorganic adhesive is in glass, waterglass, low-temperature glaze
Any one or more.
Wavelength converter the most according to claim 1, it is characterised in that described first
Bonding agent is organic adhesive, described organic adhesive be any one in silica gel, epoxy resin or
Multiple.
Wavelength converter the most according to any one of claim 1 to 7, its feature exists
In, described fluorescence coating includes described fluorescent material and the second bonding agent of bonding described fluorescent material.
Wavelength converter the most according to claim 8, it is characterised in that described first
Bonding agent and the second bonding agent are glass, and the thermal coefficient of expansion of described second bonding agent less than or
Thermal coefficient of expansion equal to described first bonding agent.
Wavelength converter the most according to claim 8, it is characterised in that described first
Bonding agent and the second bonding agent are glass, and the glass softening point of described second bonding agent less than or
Glass softening point equal to described first bonding agent.
11. Wavelength converters according to claim 8, it is characterised in that described wavelength
Conversion equipment also includes that heat-conducting substrate, described fluorescence coating and diffusing reflection layer are all attached to described heat conduction base
On plate one side surface, and described diffusing reflection layer is between described heat-conducting substrate and described fluorescence coating.
12. Wavelength converters according to claim 1, it is characterised in that described fluorescence
Layer is the fluorescence ceramics containing fluorescent material.
13. 1 kinds of diffusing reflection layers, for reflecting light, it is characterised in that include white scattering grain
First bonding agent of sub and bonding described white scattering particles, the refractive index of described white scattering particles
It is more than 1.2 with the ratio of the refractive index of described first bonding agent；The particle diameter of described white scattering particles
Between 0.1～10 micron；Described first bonding agent is transparent material；Described white scattering particles
More than 0.40 and it is less than 1.5 with the volume ratio of described first bonding agent；Described white scattering particles leads to
Cross described first bonding agent bonding and be solidified into an overall Rotating fields.
14. 1 kinds of light-source systems, it is characterised in that include light source and claim 1 to 12 times
One described Wavelength converter, described light source is positioned at the fluorescence coating of described Wavelength converter
Side to light side so that the exciting light that described light source sends carries out wavelength convert through described fluorescence coating,
And reflected by the diffusing reflection layer on described fluorescence coating shady face.
15. 1 kinds of optical projection systems, for projection imaging, it is characterised in that have such as claim
Light-source system described in 14.
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| CN201310526547.0A CN104595852B (en) | 2013-10-30 | 2013-10-30 | A kind of Wavelength converter, diffusing reflection layer, light-source system and optical projection system |
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| CN201310526547.0A CN104595852B (en) | 2013-10-30 | 2013-10-30 | A kind of Wavelength converter, diffusing reflection layer, light-source system and optical projection system |
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Address after: 518000 20-22, 20-22 headquarters building, 63 high tech Zone, Xuefu Road, Nanshan District, Guangdong Province, Guangdong. Patentee after: APPOTRONICS Corp.,Ltd. Address before: 518000 Nanshan District, Shenzhen, Guangdong, Guangdong Province, Guangdong Road, 63 Xuefu Road, high-tech zone, 21 headquarters building, 22 floor. Patentee before: SHENZHEN GUANGFENG TECHNOLOGY Co.,Ltd. Address after: 518000 Nanshan District, Shenzhen, Guangdong, Guangdong Province, Guangdong Road, 63 Xuefu Road, high-tech zone, 21 headquarters building, 22 floor. Patentee after: SHENZHEN GUANGFENG TECHNOLOGY Co.,Ltd. Address before: 518055 Guangdong province Shenzhen Nanshan District Xili town Cha Guang road Shenzhen integrated circuit design application Industrial Park 401 Patentee before: APPOTRONICS Corp.,Ltd. |