CN203489181U - Color wheel, light source system of color wheel and projection system - Google Patents
Color wheel, light source system of color wheel and projection system Download PDFInfo
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- CN203489181U CN203489181U CN201320634075.6U CN201320634075U CN203489181U CN 203489181 U CN203489181 U CN 203489181U CN 201320634075 U CN201320634075 U CN 201320634075U CN 203489181 U CN203489181 U CN 203489181U
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Abstract
The utility model discloses a color wheel, a light source system of the color wheel and a projection system. The color wheel comprises a metal base plate and a wavelength conversion layer, wherein the wavelength conversion layer comprises a ceramic substrate, a reflecting layer and a fluorescent powder layer, the ceramic substrate, the reflecting layer and the fluorescent powder layer are fixed in a stacked mode in sequence, and the side, back on to the reflecting layer, of the ceramic substrate is fixed to the metal base plate in the mode that the side, back on to the reflecting layer, of the ceramic substrate faces the metal base plate. By the adoption of the color wheel, the light source system of the color wheel and the projection system, good heat stability and good reflectivity can be achieved, and the wavelength conversion layer can be prevented from being throwing away and disengaging.
Description
Technical field
The utility model relates to illumination and Display Technique field, particularly relates to colour wheel and light-source system thereof, optical projection system.
Background technology
Adopt solid state light emitter as laser diode (LD, Laser Diode) or the exciting light that sends of light emitting diode (LED, the Light Emitting Diode) wavelength that can produce high brightness as the Wavelength conversion method of fluorescent material with excitated fluorescent powder be different from the light of excitation wavelength.This scheme has efficiently, advantage cheaply, and having become existing light source provides white light or monochromatic mainstream technology.In this kind of scheme, light source comprises excitation source and colour wheel, wherein colour wheel comprises reflection substrate and is coated in the phosphor sheet on reflection substrate, and the motor for driving reflection substrate to rotate, the hot spot that the exciting light from excitation source is formed on phosphor sheet acts on this phosphor sheet by circular path.
Conventional reflection substrate is a specular aluminium substrate, and by aluminium base with high reflection layer is stacked forms, wherein high reflection layer generally adopts rafifinal or high purity silver.And be coated in phosphor sheet on reflection substrate generally by silica gel by the bonding slabbing of fluorescent powder grain.In such structure, air easily sees through phosphor powder layer and contacts with high reflection layer, makes this high reflection layer produce and contact with air.Due to silver atoms be easy to atmosphere in reflectivity and heat endurance that hydrogen sulfide, oxygen etc. vulcanize, oxidation reaction makes high reflection layer sharply reduce; For reflective aluminum, the stability of aluminium is higher than silver, but reflectivity is not high.Therefore,, under state-of-the-art, be difficult to accomplish to take into account reflectivity and the stability of specular aluminium substrate.
Utility model content
The technical problem that the utility model mainly solves is to provide a kind of colour wheel that can take into account reflectivity and stability and light-source system thereof, optical projection system.
The utility model embodiment provides a kind of colour wheel, comprise metal base plate and wavelength conversion layer, described wavelength conversion layer comprises and stacks gradually fixing ceramic substrate, reflecting layer and phosphor powder layer, and the one side in the described reflecting layer dorsad of described ceramic substrate towards described metal base plate be fixed on described metal base plate.
Further, described metal base plate offers groove on surface, and described wavelength conversion layer is fixed in described groove.
Further, described phosphor powder layer comprises the first vitreum of fluorescent material and bonding described fluorescent material.
Further, described reflecting layer is diffuse reflector, comprises the secondary vitreous of white scattering particles and bonding described white scattering particles.
Further, the material of described ceramic substrate is pottery more than thermal conductivity 80W/mK.
Further, described metal base plate is in the form of annular discs, and described wavelength conversion layer is cirque structure, and is fixed on described metal base plate surface altogether with described metal base plate central shaft.
Further, described colour wheel also comprises driving arrangement, and described driving arrangement is connected with described metal base plate and drives described metal base plate to rotate around its central shaft.
Further, described ceramic substrate is comprised of at least two sub-ceramic substrates, and the contained fluorescent material of phosphor powder layer on different described sub-ceramic substrate is stimulated and the color of the Stimulated Light that produces is different.
Further, the material of described base plate is the composite that metal, metal alloy or metal and inorganic material form.
The utility model is also protected a kind of light-source system; comprise the excitation source that produces exciting light; also comprise as above a described colour wheel, the fluorescent material of described colour wheel is placed in the light path of the exciting light that described excitation source produces, and exciting light is converted to Stimulated Light sends.
The utility model is also protected a kind of light-source system, and a kind of optical projection system, for projection, also comprises above-mentioned light-source system.
Compared with prior art, the utility model comprises following beneficial effect:
In the utility model, at colour wheel, utilize reflecting layer, especially diffuse reflector and ceramic substrate replace traditional mirror metal plate; Wherein diffuse reflector comprises white scattering particles, and white scattering particles can carry out scattered reflection to incident light, thereby utilizes diffuse reflection to replace the mirror-reflection in traditional metal reflecting layer, has realized incident reflection of light; And the effect such as white scattering particles at high temperature can not be oxidized yet, decomposition causes character to change, weaken to incident light reflection, scattering process, so diffuse reflector can withstand higher temperatures.
Meanwhile, because the fusing point of ceramic material is higher than metal, can tolerate the temperature higher than metal; Although these ceramic thermal conductivitys are a little less than aluminium base, but still higher than the thermal conductivity of the metals such as iron, and the interface resistance between ceramic substrate and diffuse reflector, between diffuse reflector and phosphor powder layer is lower, the heat of phosphor powder layer can be conducted to ceramic substrate, and be dispersed in air, thereby improved the heat endurance of colour wheel.
In addition, in view of the toughness of ceramic material is low, fragility is high, the colour wheel that substrate is made by ceramic material is entirely when bearing high strength Ear Mucosa Treated by He Ne Laser Irradiation, and the ability of opposing thermal shock is unstable, easily occurs situation about bursting; In the utility model, adopt metal, metal alloy or metal-inorganic composite materials to make metal base plate, and be provided with ceramic substrate on the first area of this metal base plate, and diffuse reflector and phosphor powder layer be set on this ceramic substrate, compare the colour wheel that substrate is made by ceramic material entirely, reduced ceramic substrate and occurred crackle, breakage, the probability even bursting.
Finally, while working due to colour wheel, in the state of running up, therefore there is very large centripetal force.For fear of wavelength conversion layer, got rid of de-, metal base plate is provided with annular groove, like this, can increase the contact area of metal base plate 140 and ceramic substrate 130, more be conducive to the heat radiation of ceramic substrate 130, the more important thing is, can reduce between metal base plate 140 and ceramic substrate 130 due to bonding not firm and got rid of the probability that falls in rotation process.
Accompanying drawing explanation
Fig. 1 is the top view of the colour wheel of the utility model the first embodiment;
Fig. 2 is the cutaway view of colour wheel shown in Fig. 1;
Fig. 3 is the top view of the colour wheel of the utility model the second embodiment.
The specific embodiment
Below in conjunction with drawings and embodiments, the utility model embodiment is elaborated.
Refer to Fig. 1 and Fig. 2, Fig. 1 is the top view of an embodiment of the utility model colour wheel, and Fig. 2 is the half sectional view of colour wheel shown in Fig. 1.
Colour wheel comprises metal base plate 140 and wavelength conversion layer, wavelength conversion layer comprises and stacks gradually fixing ceramic substrate 130, reflecting layer 120 and phosphor powder layer 110, metal base plate offers groove on 140 surfaces, wavelength conversion layer is integrally fixed in groove, and the one side of the back-reflection layer of ceramic substrate 130 is towards the bottom surface of described groove.Colour wheel also comprises driving arrangement 150, and it is fixedly connected with metal base plate 140.
That ceramic substrate 130 is is holistic, with the shape of first area 140a match circular, and be arranged on the first area 140a of metal base plate 140.In practice, can adopt the viscose glue (for example elargol or insert the silica gel of heat conduction particle) of high heat conduction that this ceramic substrate 130 is bonded on the 140a of first area.Preferably, ceramic substrate 130 is aluminum oxide substrate, aluminium nitride substrate, silicon nitride board, silicon carbide substrate, boron nitride substrate or beryllium oxide substrate, and they are all the ceramic wafers with compact texture, do not have loose structure.The thermal conductivity of these materials is more than 80W/mK, and fusing point is substantially more than 2000 degrees Celsius, so they are when realizing heat conduction, can also tolerate higher temperature.Certainly, in thermal conductivity to ceramic substrate, requiring is not that in very high occasion, ceramic substrate also can adopt the ceramic wafer of other kinds to make.
For instance, aluminium nitride ceramics be metal base plate on surface, arrange a layer thickness be the alumina powder of 0.8mm as diffuse reflector, this alumina powder particle diameter is distributed as between 0.1 μ m to 1 μ m, the mass ratio of itself and bonding agent is 12:1.The reflectivity with respect to specular aluminium substrate that now records diffuse reflector is 99.9%, almost identical with specular aluminium substrate.Certainly, the particle diameter of diffuse reflection particle, the thickness of diffuse reflector and density can also be other numerical value, and these numerical value can be tested and be obtained by several times according to prior art by those skilled in the art.
Certainly, reflecting layer of the present utility model also can total reflection medium film, such as having aluminium film, silverskin of high reflectance etc.
In the utility model embodiment, colour wheel utilizes reflecting layer, and especially diffuse reflector and ceramic substrate replace traditional mirror metal plate.Wherein diffuse reflector comprises white scattering particles, and white scattering particles can carry out scattering to incident light, thereby utilizes diffuse reflection to replace the mirror-reflection in traditional metal reflecting layer, has realized incident reflection of light.And white scattering particles at high temperature also can not be oxidized and absorb incident light, so diffuse reflector can withstand higher temperatures.Meanwhile, because the fusing point of ceramic substrate material is higher than metal, can tolerate the temperature higher than metal.
For specular aluminium substrate, its surperficial smoother, when phosphor powder layer is after the surface forming of specular aluminium substrate, the surface of phosphor powder layer and substrate contacts can be shunk, and part is separated with substrate, make the contact area of phosphor powder layer and specular aluminium substrate less, so the interface resistance between phosphor powder layer and specular aluminium substrate is larger.And for the colour wheel of aluminum nitride ceramic substrate, because the surface of ceramic substrate and diffuse reflector is all relatively coarse, therefore, contact area between phosphor powder layer and diffuse reflector, between diffuse reflector and ceramic substrate is larger, make the interface resistance after colour wheel moulding less, thereby the heat of phosphor powder layer can be passed to ceramic substrate more, make colour wheel can tolerate higher temperature.
In the present embodiment, the colour wheel rotating makes diverse location on phosphor powder layer periodically by the light path of exciting light the optical excitation that is excited, the focus that the time being excited for each position so just turns to the first reflecting surface in a flash, its temperature is reduced greatly, and efficiency significantly improves.。
While working due to colour wheel, in the state of running up, therefore there is very large centripetal force.If wavelength conversion layer is set directly to the metal base plate surface of plane, is easily subject to centripetal force effect and gets rid of de-.And in the utility model, the first area of metal base plate 140 is preferably made as annular groove, and ceramic substrate 130 is arranged in groove.Like this, can increase the contact area of metal base plate 140 and ceramic substrate 130, more be conducive to the heat radiation of ceramic substrate 130, the more important thing is, can reduce between metal base plate 140 and ceramic substrate 130 due to bonding not firm and got rid of the probability that falls in rotation process.Preferably, the shape area of this groove is a bit larger tham the shape area of ceramic substrate, to facilitate the installation of ceramic substrate.
This groove can be that metal base plate 140 surfaces are offered downwards, can be also at rat, and the groove of then offering in this bossing, does not limit herein.
In the present embodiment, the shape of ceramic substrate 130 and phosphor powder layer 110 only, for for example, is not limited.For instance, this ceramic substrate 130 and phosphor powder layer 110 also can all be belt-like zone or take other suitable set-up modes, and driving arrangement 150 is linear translation device or takes other suitable set-up modes, make the hot spot that incident light produces on phosphor powder layer 110 act on this phosphor powder layer 110 along straight line path or other predefined paths.
In actual applications, fluorescent material generally can be packaged into an integral body by bonding agent, and wherein the most frequently used is silica gel bonding agent, its stable chemical nature, has higher mechanical strength.But silica gel bonding agent is can tolerable temperature lower, generally at 300 degrees Celsius to 500 degrees Celsius.In order to be applied in powerful light-emitting device, preferably, can be with inorganic adhesive by integral body of the bonding one-tenth of fluorescent material, inorganic adhesive can be waterglass, glass dust etc., to realize resistant to elevated temperatures reflective fluorescent material wheel.
Preferably, the bonding agent of phosphor powder layer 110 is the first glass dust, and glass dust is a kind of glass isotropic body of amorphous granular shape, the high and stable chemical nature of its transparency.The first glass dust and fluorescent material can make by the process of sinter molding the adhesion between phosphor powder layer 110 and diffuse reflector very strong, and can tolerate higher temperature.
Similarly, white scattering particles also needs by integral body of the bonding one-tenth of bonding agent.Bonding agent can be also silica gel, waterglass etc.And preferably, white scattering particles is bonding by the second glass dust.Second glass dust here can be the glass dust identical with the first glass dust, can be also different glass dust.In diffuse reflector, the first glass dust carries out white scattering particles bonding, and white scattering particles and air is isolated, to avoid white scattering particles to make moist in air, and makes diffuse reflector have higher intensity and transmitance.Meanwhile, when the bonding agent of phosphor powder layer 110 and diffuse reflector is all glass dust, can be by phosphor powder layer 110 at diffuse reflector surface sinter molding or diffuse reflector in the surperficial sinter molding of phosphor powder layer 110, make the stronger adhesion that has between the two.
What deserves to be explained is, moulding diffuse reflector in the ban, then when the sintering phosphor powder layer 110 of diffuse reflector surface, in order to make in the process of sintering phosphor powder layer 110, diffuse reflector 120 is not impacted, sintering temperature is preferably below the softening temperature of the first glass dust, and therefore the softening temperature of the first glass dust will be higher than the softening temperature of the second glass dust.In like manner, moulding phosphor powder layer 110 in the ban, and then, when the surperficial sintering diffuse reflector 120 of phosphor powder layer 110, sintering temperature is preferably below the softening temperature of the second glass dust, and the softening temperature of the first glass dust will be lower than the softening temperature of the second glass dust.
As shown in Figure 3,
In the present embodiment, ceramic substrate 130 can not be also integral body circular, but is spliced into a complete annulus by least two sub-ceramic substrates that are arcuation.Compare and be whole circular, this ceramic substrate that is spliced into annulus occurs that crackle, the damaged probability even bursting are lower.Correspondingly, the fluorescent material of different colours is set to respectively on different sub-ceramic substrates.
Concrete example, as shown in Figure 3, ceramic substrate 130 forms an annulus by three sub-ceramic substrate 130a, 130b and 130c that are arcuation.Different sub-ceramic base plate surfaces arrange the phosphor powder layer of different respective area.For example be respectively yellow fluorescence bisque, green phosphor layer, red fluorescence bisque.
In being whole circular ceramic substrate, if in the time of will applying the fluorescent material of different colours, because the size of ceramic substrate is larger, the disposable difficulty that completes bisque blade coating is larger, and different colours section needs gradation blade coating and sintering, and fabrication cycle is longer.And in this spliced annulus, the fluorescent material of different colours simultaneously blade coating, in corresponding pottery section, because the size of pottery section is less, is easy to a blade coating moulding, and the pottery section that has respectively applied fluorescent material is sintering simultaneously, greatly shortened the fabrication cycle of colour wheel.
Certainly, the number of partitions that above phosphor powder layer is included and color are for example, do not limit.In practice, can adopt subregion and the color of other quantity, even on a subregion, also can comprise the fluorescent material of at least two kinds of colors.
The utility model is also protected a kind of light-source system, and it comprises the excitation source that produces exciting light, also comprises above-mentioned colour wheel, and the phosphor powder layer of colour wheel is placed in the light path of the exciting light that described excitation source produces, and exciting light is converted to Stimulated Light sends.
The utility model embodiment also provides a kind of optical projection system, for projection imaging, comprises aforesaid light-source system.This optical projection system can adopt various shadow casting techniques, for example liquid crystal display (LCD, Liquid Crystal Display) shadow casting technique, digital light path processor (DLP, Digital Light Processor) shadow casting technique.In addition, above-mentioned light-emitting device also can be applied to illuminator, for example stage lighting illumination.
The foregoing is only embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model description and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (11)
1. a colour wheel, it is characterized in that, comprise metal base plate and wavelength conversion layer, described wavelength conversion layer comprises and stacks gradually fixing ceramic substrate, reflecting layer and phosphor powder layer, and the one side in the described reflecting layer dorsad of described ceramic substrate towards described metal base plate be fixed on described metal base plate.
2. colour wheel according to claim 1, is characterized in that, described metal base plate offers groove on surface, and described wavelength conversion layer is fixed in described groove.
3. colour wheel according to claim 1, is characterized in that, described phosphor powder layer comprises the first vitreum of fluorescent material and bonding described fluorescent material.
4. colour wheel according to claim 1, is characterized in that, described reflecting layer is diffuse reflector, comprises the secondary vitreous of white scattering particles and bonding described white scattering particles.
5. colour wheel according to claim 1, is characterized in that, the material of described ceramic substrate is pottery more than thermal conductivity 80W/mK.
6. colour wheel according to claim 1, is characterized in that, described metal base plate is in the form of annular discs, and described wavelength conversion layer is cirque structure, and is fixed on described metal base plate surface altogether with described metal base plate central shaft.
7. colour wheel according to claim 6, is characterized in that, described colour wheel also comprises driving arrangement, and described driving arrangement is connected with described metal base plate and drives described metal base plate to rotate around its central shaft.
8. colour wheel according to claim 1, is characterized in that, described ceramic substrate is comprised of at least two sub-ceramic substrates, and the contained fluorescent material of phosphor powder layer on different described sub-ceramic substrate is stimulated and the color of the Stimulated Light that produces is different.
9. colour wheel according to claim 1, is characterized in that, the material of described metal base plate is the composite that metal, metal alloy or metal and inorganic material form.
10. a light-source system, it is characterized in that, comprise the excitation source that produces exciting light, also comprise the colour wheel as described in claim 1 to 9 any one, the fluorescent material of described colour wheel is placed in the light path of the exciting light that described excitation source produces, and exciting light is converted to Stimulated Light sends.
11. 1 kinds of optical projection systems, for projection, is characterized in that, also comprise light-source system as claimed in claim 10.
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| CN201320634075.6U CN203489181U (en) | 2013-10-15 | 2013-10-15 | Color wheel, light source system of color wheel and projection system |
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| CN201320634075.6U CN203489181U (en) | 2013-10-15 | 2013-10-15 | Color wheel, light source system of color wheel and projection system |
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Cited By (35)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103912848A (en) * | 2014-02-24 | 2014-07-09 | 扬州吉新光电有限公司 | Fluorescent powder color wheel for optical design by using diffuse reflection substrate and manufacture method of fluorescent powder color wheel |
| WO2015055088A1 (en) * | 2013-10-15 | 2015-04-23 | 深圳市光峰光电技术有限公司 | Manufacturing method for wavelength conversion device |
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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: 518057 Shenzhen Integrated Circuit Design and Application Industrial Park 401, No. 1089 Chaguang Road, Xili Town, Nanshan District, Shenzhen City, Guangdong Province Patentee before: APPOTRONICS Corp.,Ltd. |
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