CN103335275B - The optically-coupled of LED lamp and the method for conduction loss against sunshine and device thereof - Google Patents
The optically-coupled of LED lamp and the method for conduction loss against sunshine and device thereof Download PDFInfo
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Abstract
The present invention relates to a kind of optically-coupled of LED lamp and the method for conduction loss against sunshine and device thereof.The present invention is that optocoupler mixture is added in the space between LED lamp bead and half concave ball shape of LED collector lens, and the refractive index of described optocoupler mixture is close to the refractive index even exceeding LED lamp bead bright dipping encapsulation medium.Material of the present invention is easy to get, technical maturity, and it is convenient to implement, and implementation variation is with low cost, and improves the Be very effective of LED lamp light extraction efficiency, meets the requirement of green illumination, energy-saving and emission-reduction.
Description
Technical field
The invention belongs to light optics field, relate to the optically-coupled of LED and equipment, particularly LED lamp and the method for conduction loss against sunshine and device thereof.
Background technology
LED becomes important lighting source so that its light efficiency is high.But LED belongs to spot light, encapsulation has different greatly from incandescent lamp.In order to effectively draw light, LED projection lamp LED lamp bead and the optical collection-beam condensing unit of band special concave ball shape shape matched, effectively have collected the great power LED light launched to four directions, and through the refraction of optical concentration device and reflection, with low-angle outgoing, project very little area, uneven illumination is even, the brightness of lamp luminescence face is too high, and produce dazzle, LED projection lamp can only be used for local lighting.
The LED projection lamp of the market supply of material forms industrial chain, the parts large-scale production of LED projection lamp or other LED, and light fixture manufacturer adopts OEM to assemble form shape and produces by batch.The LED collector lens of photoconduction form integrates collection-projection light, and formed mould, shaping production, supply of material one continuous line, each parts in LED industrial chain are fixed, and the size of any one parts is changed and may be led one and the dynamic overall situation.LED collector lens has single lamp pearl, 3 lamp pearls, 5 lamp pearls, 7 lamp pearls ... and other forms, according to the most frequently used 1WLED lamp pearl, they are corresponding 1W, 3W, 5W, 7W respectively ...Wherein the utilization rate of 3WLED projecting lamp is the highest, and the collector lens of 3 lamp pearls is the most universal, and price is minimum; The collector lens use amount of 5 lamp pearls significantly reduces.In order to improve the versatility of LED collector lens, also nW great power LED projecting lamp is formed by n single collector lens, by the power of the number adjustment LED projection lamp of light fixture light-emitting window, but the complexity of assembling and difficulty significantly rise, and the labour cost accounting in manufacturing cost improves.
The dazzle reducing light source always adopts frosted glass, corrugated glass refraction or milky lampshade, uprises brightness, spot light is area source.People adopt various design to improve LED lamp, improve light efficiency.Recognize the participation improving LED lamp light efficiency and need optical technology at present.
Summary of the invention
The present invention is analyzed by basic optical, have studied the border refraction of LED lamp bead bright dipping medium, reflection and total reflection rule, by the optically-coupled of LED lamp bead and LED lamp collector lens (conducting for ray-collecting-optical concentration/light), reduce the reflectivity between interface, expand effective incidence angle---the cirtical angle of total reflection that LED bright dipping encapsulation is relevant with bright dipping luminous flux, increase outgoing spherical crown relative area and visual field; " visual field " described herein is: the limit angle of the bright dipping encapsulation inner (with bright dipping package surface normal) seen from bright dipping encapsulation outside and corresponding border thereof.Light for the light-guiding pillar of LED collector lens leaks and creates the total reflection method of light-guiding pillar, improves LED light extraction efficiency.The technical measures utilizing the method to be formed and the related components of device and structure thereof.
Basic functional principle of the present invention is based on the light reflectivity R of transparent medium and transmissivity T relation, and the law of refraction of light medium.Be derived concept related to the present invention, basic function and technical measures thus.
The computing formula (1) of the reflectivity R on transparent medium surface
When refractive index n '=1.5 of the transparent mediums such as glass, and the refractive index n=1.0 of air, result of calculation is R=0.04, and namely each surface reflectivity of glass plate is about 4%, the transmissivity T of water white white glass plate only has 92.16%, therefore the total reflectivity Rt of colourless white glass plate
white glass plate=1-T=1-92.16%=7.84%.On LED lamp bead and LED collector lens special mating hole---the air gap between half concave ball shape is caused and is created two secondary reflections from LED lamp bead surface-air gap-LED collector lens half concave ball shape surface, reflectivity meets formula (1), the wherein refractive index of n ' the bright dipping encapsulating material that is large-power LED light bead, many employings refractive index between 1.4 ~ 1.5, the visible-range iuuminting rate organosilicon that is greater than 99%, calculate by formula (1), the reflectivity of organosilicon and air is between 2.78%(organosilicon refractive index n '=1.4) ~ 4.00%(n '=1.5) between.The law of refraction
n’sini’=nsini（2）
Obtained by equilibrium relationships: the side incidence angle that refractive index is large or the angle of emergence little.According to formula (2), from the light that LED die is launched, the critical angle 45.585 ° (n '=1.4) of total reflection ~ 41.81 ° (n '=1.5) can not be exceeded in the angle incidence angle (LED chip side) of bright dipping package surface and normal, the light being greater than critical angle will be totally reflected, and circumference (actual for sphere) there is multiple total reflection until optical energy loss totally.According to spherical corona's area computing formula, 2 π R
2(1-cosi '), wherein i ' is the angle of spherical crown center (axle) to spherical crown edge; Introduce relative spherical corona's area S
r=spherical corona's area S
s: hemisphere area S
h, relative spherical corona's area
S
R=(1－cosi’)（3）
Wherein i ' is the angle of spherical crown center (axle) to spherical crown edge.
Corresponding LED lamp bead light beam inside irradiates the incidence angle i ' of dielectric surface.
The cirtical angle of total reflection of LED encapsulation material refractive index n '=1.4 45.585 °, relative spherical corona's area
S
R=(1－cos45.585°)=30.0%，
The critical angle of the total reflection of LED encapsulation material refractive index n '=1.5 41.81 °, relative spherical corona's area
S
R=(1－cos41.81°)=25.5%。
Above analytical calculation finds, effective bright dipping sectional area of large power white light LED transparent encapsulant glue is subject to the impact of the cirtical angle of total reflection, between 30.0% ~ 25.5%, most of radiation in actual package is beyond the cirtical angle of total reflection, at sphere (bright dipping encapsulation inner surface) interreflection, can only can not form effective bright dipping.
In addition, half concave ball shape of LED lamp bead direct irradiation LED collector lens rear end face, light enters light-guiding pillar; There is the light beam that quite a few does not meet total reflection condition in the light-guiding pillar near half concave ball shape, is reflected outside cylinder by light-guiding pillar side; The reverberation that collector lens front end face (outgoing end face) produces with the interface of air causes transmission loss.
The present invention is according to the relation of reflectance formula (1), the refractive indices n of two media is less, reflectivity R is lower, in order to reduce the reflection loss even eliminated between LED lamp bead to LED collector lens, optocoupler mixture is added in space between LED lamp bead and half concave ball shape of LED collector lens, the refractive index of described optocoupler mixture is close to the refractive index even exceeding LED lamp bead bright dipping encapsulation medium, cause the molecular moiety of the corresponding formula (1) of the refractive indices n(1. reducing two kinds of light transmission mediums inside and outside LED lamp bead), reflectivity between LED lamp bead and LED collector lens (half concave ball shape) is sharply reduced, improve the light transmittance of LED lamp bead and the light-inletting quantity of LED collector lens, 2. according to formula (2), the refractive index n of optically thinner medium is changed, by the initiation incidence angle of optically denser medium side or the change of the angle of emergence, extrapolating accordingly, there is the critical angle i of total reflection at dielectric surface in the light beam sent from optically denser medium side
c' change with the refractive index n of optically thinner medium, when the refractive index n of optically thinner medium increases, the cirtical angle of total reflection i in optically denser medium
c' become large, as the light beam cirtical angle of total reflection i in the glass of n '=1.5
c', the refractive index n=1.0(air when optically thinner medium), the cirtical angle of total reflection i in optically denser medium
c'=41.81 °, after optically thinner medium changes the water of refractive index n=1.33 into, the cirtical angle of total reflection i in optically denser medium
c'=62.46 °, corresponding relative spherical corona's area S
r=1-cos62.46 °=53.76%, if select water white castor oil, the castor oil refractive index n=1.478 ~ 1.479(20 DEG C as India's supply of material), after it mates with the glass of n '=1.5, the cirtical angle of total reflection i in glass
c'=80.17 ° ~ 80.40 °, cirtical angle of total reflection i
c' the spherical crown surface area that formed accounts for hemispherical 83.15%(relative surface area), be glass and air cirtical angle of total reflection i
c' formed 3.26 times of spherical corona's area, the natural daylight of incidence angle i '=80 ° ~ 90 ° at the reflectivity of glass surface up to 40% ~ 100%, the belt-like zone relative area 17.36% of this part, 1 curve III with reference to the accompanying drawings, under incidence angle i=80 ° ~ 90 ° (angle of grazing), nature light reflectance R=40% ~ 100%, Weighted Average Method about 70%, therefore it is little to continue to expand the efficiency of transmission impact of the cirtical angle of total reflection on light.This is analyzed popularization and uses LED lamp bead, the light in lamp pearl bright dipping encapsulation, in package surface, refraction and reflection occur, exceed cirtical angle of total reflection i
c' light can only along ball inner periphery reflection until loss totally; Improve the refractive index n of the peripheral medium of LED chip, the cirtical angle of total reflection i in LED bright dipping encapsulation can be expanded
c', thus the relative area of the bright dipping spherical crown of the Effective emission angle improved in bright dipping encapsulation circle and correspondence, make LED inside exceed cirtical angle of total reflection i
c' area become very little; Further measure, original optically thinner medium is made into refractive index n higher than after optically denser medium, position exchanged by optically thinner medium and optically denser medium, namely after the refractive index n ' of LED bright dipping encapsulation is less than the refractive index n of optocoupler mixture, the light sent in LED bright dipping encapsulation can not be totally reflected, and this just greatly can improve the light extraction efficiency of high-power LED chip.After adding optocoupler mixture, the reflectivity that LED bright dipping is encapsulated between optocoupler mixture two media can reduce significantly, such as, aforementioned refractive index n=1.478 ~ 1.479(20 DEG C) castor oil and the glass of refractive index n '=1.5 between reflectance reduction to 0.005%.
The present invention derives and analytical calculation according to above-mentioned theory, and corresponding experimental verification, obtain the light extraction efficiency of the legal raising LED lamp of optocoupler, reduce light fixture equipment interface reflecting rate, the present invention uses water white optocoupler mixture, described optocoupler mixture refractive index 1.4 ~ 1.64.The beam angle that LED bright dipping is encapsulated expands to LED bright dipping encapsulation from corresponding with Air Interface 45.585 ° (n '=1.4) ~ 41.81 ° (n '=1.5) and becomes 90 ° after optically thinner medium; Bright dipping spherical crown relative area expands to 100% from 25.46% ~ 30.0%.
Half concave ball shape of LED lamp bead irradiation LED collector lens also enters light-guiding pillar, and the light near LED collector lens rear end face and half recessed spheroid is difficult to meet total reflection condition and be leaked in the side air of light-guiding pillar.The present invention adopts bounce technique to be returned in light-guiding pillar by special mirror-reflection by the light not meeting the cirtical angle of total reflection, and the reflector that the retrodirective reflection light caused by LED collector lens front end face is arranged by LED collector lens rear end face is reflected back in the light-guiding pillar of LED collector lens.The equipment that bounce technique of the present invention is corresponding is the LED collector lens of band reflection shield, and reflector is worn in LED collector lens rear end.Different according to purposes, the LED collector lens of described band reflector divides two classes: a class forms the LED light equipment of projection by LED concentrator lens structure+reflector, the another kind of LED light equipment being made up of diffusion LED concentrator lens structure+reflector+scattering layer.
The present invention's equipment used: water white optocoupler mixture, the LED collector lens of band reflector or the LED collector lens of band reflector and scattering layer.Water white optocoupler mixture is optional selects the dimethicone that refractive index is 1.4, and current high-powered LED lamp bright dipping encapsulation adopts organosilicon, with the material matching of optocoupler mixture more; Optocoupler mixture can also select the phenyl end hydrogen silicone oil of refractive index 1.5 according to the actual refractive index of LED bright dipping encapsulation, the refraction oil of 1.64.LED collector lens with reflector on the basis of conventional common LED collector lens, a class LED collector lens rear end face and near LED collector lens light-guiding pillar side set up reflector; Another kind of LED collector lens rear end face and near LED collector lens light-guiding pillar side set up reflector, and set up scattering layer at LED collector lens front end face, scattering layer can be formed with frosted treatment process or pad pasting is formed.Material of the present invention is easy to get, technical maturity, and it is convenient to implement, and implementation variation is with low cost, and improves the Be very effective of LED lamp light extraction efficiency, meets the requirement of green illumination, energy-saving and emission-reduction.
Accompanying drawing explanation
The transparent medium boundary reflection rate curve figure of n=1.0 and n '=1.5 that accompanying drawing 1 is quoted for the present invention.
Accompanying drawing 2 is the present invention about the geometrical relationship figure of spherical crown and the corresponding spherical crown schematic diagram of the cirtical angle of total reflection.
The LED concentrator lens structure schematic diagram of single lamp pearl that accompanying drawing 3 is commonly used for great power LED projecting lamp.
Accompanying drawing 4 is primary optics assembly structure schematic diagram of the present invention.
Accompanying drawing 5 is the LED collector lens internal reflection light path figure of band reflector of the present invention.
Accompanying drawing 6 is the LED concentrator lens structure schematic diagram of many lamps pearl of the present invention band reflector.
Accompanying drawing 7(a) be single lamp pearl band reflector of the present invention and scattering layer LED concentrator lens structure schematic diagram.
Accompanying drawing 7(b) be many lamps pearl band reflector of the present invention and scattering layer LED concentrator lens structure schematic diagram.
Detailed description of the invention
The present invention is set forth below in conjunction with accompanying drawing.
The theory of computation of foundation of the present invention and derivation thereof:
Accompanying drawing 1 quotes the transparent medium boundary reflection rate curve figure with n=1.0 and n '=1.5 of foundation for the present invention, Figure 12-13 that home country's light taken from by material, " optics " (People's Education Publishing House, 1978.9 first editions) are compiled in the order of war unit.Curve I in figure, curve II, curve III are corresponding respectively: the reflectivity Rp being parallel to plane of incidence vibration (polarised light), perpendicular to reflectivity Rs and the natural light reflectance R of plane of incidence vibration (polarised light), the longitudinal axis represents reflectivity R, and transverse axis is incidence angle i.Common non-polarized light (natural daylight) homologous thread III.As seen from Figure 1, the reflectivity R of incidence angle i within 40 ° is almost constant, and reflectivity depends on formula (1); In formula, n ', n are respectively the refractive index of the different medium of both sides, interface.About refractive index n '=1.5 of general glass, and the refractive index n=1.0 of air, the reflectivity R=0.0400 (4.00%) calculated.
The law of refraction
n’sini’=nsini（2）
According to formula (2), the side incidence angle that refractive index is large or the angle of emergence little.From the light that LED die is launched, bright dipping package surface and normal angle---incidence angle (LED chip side) can not exceed critical angle 45.585 ° (bright dipping encapsulates refractive index n '=1.4) ~ 41.81 ° (bright dipping encapsulates refractive index n '=1.5) of total reflection, the light being greater than critical angle will be totally reflected, and circumferentially (sphere) there is multiple total reflection until optical energy loss totally.
Accompanying drawing 2 is the geometric representation of the present invention about spherical crown and the schematic diagram of the corresponding spherical crown of the cirtical angle of total reflection.Known spherical corona's area S
s=2 π RH, wherein R is the radius length of the centre of sphere to ball surface, and H is the height of spherical crown, as the geometrical relationship of accompanying drawing 2.According to its geometrical relationship, spherical crown height H=R(1-cosi '), wherein i ' is the angle at z-axis (spherical crown center) and edge, spherical crown base, therefore spherical corona's area computing formula S
s=2 π R
2(1-cosi '); Introduce relative spherical corona's area S
r=spherical corona's area S
s: hemisphere area S
h, relative spherical corona's area
S
R=(1－cosi’)（3）
Wherein i ' is the angle at z-axis (spherical crown center) and edge, spherical crown base.Like this, the surface area of spherical crown is directly expressed as the relation of the centre of sphere to the angle i ' at edge, spherical crown base.
LED lamp bead inner light beam irradiates bright dipping encapsulation medium surface, the angle that incidence angle i ' is bright dipping package surface normal and LED light bundle.LED bright dipping encapsulating material plays optically denser medium, and LED is outward air (optically thinner medium), and according to law of refraction formula (2), the critical angle that total reflection occurs is: the angle i=90 ° of air side, by formula (2), and the cirtical angle of total reflection i that bright dipping encapsulation is inner
c' and sini
c'=nsini/n ' direct correlation.For LED bright dipping encapsulation (light-emitting window) borderline any point O, incidence angle i ' from inside to outside, owing to having YAG fluorescent powder in white light LEDs sealing, can produce diffused light, bright dipping packaging plastic can produce stress, microbubble when solidifying, and causes bright dipping to encapsulate with diffused features.Did the section of bright dipping package surface any point O, as accompanying drawing 2 is crossed shown in the horizontal profile of the centre of sphere, be that the neighborhood of the centre of sphere makes hemisphere face with O, the incident beam radially running orbit of any direction, with the angle i ' of section normal direction.According to reflection law, reverberation becomes mirror image with incident light, angle of reflection and incidence angle equal and opposite in direction, as the reflection dotted arrow indication of accompanying drawing 2.Cirtical angle of total reflection i in LED bright dipping encapsulation
c', the Rdi ' endless belt as accompanying drawing 2 surrounds corresponding spherical crown, then cirtical angle of total reflection i
c' define one and have the spherical crown determining relative area.Be greater than cirtical angle of total reflection i
c' light all can not appear in visual field." visual field " described herein is: the limit angle of the bright dipping encapsulation inner (with bright dipping package surface normal) seen from bright dipping encapsulation outside and corresponding border thereof.
At present, the bright dipping encapsulating material of high power LED device adopts the organosilicon (resin) of good light permeability and heatproof 200 DEG C in a large number, its refractive index n ' is between 1.4 ~ 1.5, as n '=1.40 of 201 dimethicones, phenyl end hydrogen silicone oil divides n '=1.50 and the 1.51 different trades mark, n '=1.30 ~ 1.48 of hydrogeneous MQ silicones, phenyl end hydrogen silicones refractive index n ' has 1.44,1.45,1.49,1.50,1.51 to have the multiple trade mark.If bright dipping encapsulating material refractive index n '=1.4 of large-power LED light bead, the corresponding cirtical angle of total reflection 45.585 °, its relative spherical corona's area
S
R=(1－cos45.585°)=30.0%，
If bright dipping encapsulating material refractive index n '=1.5 of large-power LED light bead, the critical angle 41.81 ° of corresponding total reflection, relative spherical corona's area
S
R=(1－cos41.81°)=25.5%。
Found by above analytical calculation, effective bright dipping relative area of large power white light LED transparent encapsulant glue is subject to the impact of the cirtical angle of total reflection, between 30.0% ~ 25.5%, the neighborhood of LED bright dipping package surface any point O, only dropping on the light that the point on spherical crown sends just can by the outgoing of O point, and the most of radiation wherein on this neighborhood have all exceeded cirtical angle of total reflection i
c', the radiation that they arrive O point can only lose by interreflection in sphere.Introduce the concept of " visual field ", take the cirtical angle of total reflection as boundary, " visual field " LED light below cannot overflow LED forever.If the critical angle of total reflection can be expanded, also just can expand visual field, draw the light radiation of more LED chip.The light radiation that the present invention is based on LED chip inner most cannot draw the encapsulation fact out-of-bounds by bright dipping encapsulation, and look for another way expansion visual field, improves the light emission rate of LED.
According to law of refraction formula (2), change the refractive index n of optically thinner medium, by the initiation incidence angle of optically denser medium side or the change of the angle of emergence; Reach a conclusion accordingly: the light beam sent from optically denser medium side, at dielectric surface, the critical angle i of total reflection occurs
c' change with the refractive index n of optically thinner medium, when the refractive index n of optically thinner medium increases, the cirtical angle of total reflection i in optically denser medium
c' become large, as the cirtical angle of total reflection i of outgoing beam in the glass of n '=1.5 or macromolecule light transmissive material
c', the refractive index n=1.0(air when optically thinner medium), the cirtical angle of total reflection i in optically denser medium
c'=41.81 °, corresponding relative spherical corona's area S
r=1-cos41.81 °=25.5%; After optically thinner medium changes the water of refractive index n=1.33 into, the cirtical angle of total reflection i in optically denser medium
c'=62.46 °, corresponding relative spherical corona's area S
r=1-cos62.46 °=53.76%, vision range is original 2.1 times; If select water white castor oil, the castor oil refractive index n=1.478 ~ 1.479(20 DEG C as India's supply of material), after it mates with the glass of n '=1.5, the cirtical angle of total reflection i in glass
c'=80.17 ° ~ 80.40 °, the spherical crown surface area that the cirtical angle of total reflection is formed accounts for hemispherical 83.15%, is glass and air cirtical angle of total reflection i
c' formed 3.26 times of spherical corona's area; The natural daylight of incidence angle i '=80 ° ~ 90 ° at the reflectivity of glass and air surface up to 40% ~ 100%, the area 17.36% in the banded spherical area opposite hemispheres face of this part, with reference to the accompanying drawings 1, under incidence angle i=80 ° ~ 90 ° angles of grazing, the natural light reflectance 40% ~ 100% at the glass of n=1.5 and the interface of air, mean value is up to 70%, even if the refringence adding glass and water only has Δ n=0.17 to the correction of the impact of reflectivity, the average natural reflectivity in this region estimates also have 50%, therefore, continue to expand cirtical angle of total reflection i
c' the efficiency of transmission impact of light is diminished.
This being analyzed popularization and uses LED lamp bead, there is refraction and reflection in package surface in the light in the bright dipping of lamp pearl encapsulates, and exceedes the light of the cirtical angle of total reflection always along the inner periphery reflection of ball until lose totally; Improve the refractive index n of the peripheral medium of LED lamp bead, the cirtical angle of total reflection i of any point (O) in LED bright dipping package interface can be expanded
c', thus the relative area of effective bright dipping spherical crown of the effective incidence angle promoted in bright dipping encapsulation circle and correspondence thereof, reach the object of expansion " visual field ", and the peripheral medium of LED lamp bead that the area making LED inside exceed the cirtical angle of total reflection becomes very little, described herein is optocoupler mixture of the present invention; Further, make the optocoupler mixture of original optically thinner medium into refractive index n higher than after optically denser medium, position exchanged by optically thinner medium and optically denser medium, after the refractive index n ' that LED bright dipping encapsulates is less than the refractive index n of optocoupler mixture, the total reflection of LED light Shu Yinqi will be there is not in LED bright dipping package surface (LED chip side), make the outgoing visual field of LED bright dipping package surface any point O become whole plane, this greatly improves the light extraction efficiency of high-power LED chip.
The LED concentrator lens structure schematic diagram of single lamp pearl that accompanying drawing 3 is commonly used for great power LED projecting lamp.In figure, shown in LED collector lens 1, the half concave ball shape S1(dotted semi-circle lines of single led lamp pearl), the profile of itself and LED lamp bead LEDGlass is coincide, and wraps in supporting LED lamp bead LEDGlass(figure and do not draw during use) light-emitting area.Light-guiding pillar S2, LED collector lens front end face OF(is dull and stereotyped), the thickness h of LED collector lens front end face OF, LED collector lens rear end face OB(plane).
Accompanying drawing 4 is primary optics assembly structure schematic diagram of the present invention.In figure, circuit board PCB, LED component LEDChip install (welding) on the circuit board pcb, and hemisphere lamp pearl LEDGlass protrudes on LED component LEDChip surface; The LED collector lens 1 of single led lamp pearl, shown in half concave ball shape S1(dotted semi-circle lines) coincide with the profile of the hemisphere lamp pearl LEDGlass of LED component LEDChip, the exiting surface of LED lamp bead LEDGlass is wrapped during use, but there is space between two optical elements, has been filled with optocoupler mixture OCA.The refractive index n of optocoupler mixture OCA is close to the refractive index n ' of hemisphere lamp pearl LEDGlass; Light-guiding pillar S2, LED collector lens front end face OF(is dull and stereotyped), the thickness h of LED collector lens front end face OF, LED collector lens rear end face OB(plane), these structures, size are all identical for the LED collector lens 1 of common single led lamp pearl with in the great power LED projecting lamp of accompanying drawing 3, it is dull and stereotyped that the LED light received is directed into LED collector lens front end face OF(by light-guiding pillar S2), be mapped to outside lamp through reflecting; The LED collector lens rear end face OB of the present invention at LED collector lens 1 and the light-guiding pillar S2 side near LED collector lens rear end face OB add the reflector R combined closely with LED collector lens 1 optical lens optical surface, reverse LED light of advancing is reflexed to LED collector lens front end face OF by reflector R, and does not allow it overflow the side of LED collector lens rear end face OB and light-guiding pillar S2.
Accompanying drawing 5 is LED collector lens light path and the operation principle schematic diagram of band reflector of the present invention.In figure, each word marking of same area is identical with the mark in accompanying drawing 4 with accompanying drawing 3.To the half concave ball shape S1 of common LED collector lens 1, the LED lamp bead LEDGlass direct irradiation LED collector lens rear end face OB of OEM as shown in Figure 3, light enters light-guiding pillar S2; Light-guiding pillar S2 near half concave ball shape S1, does not meet the light beam of total reflection condition, is reflected outside the cylinder of light-guiding pillar S2 by light-guiding pillar side.The LED collector lens 1 of band reflection shield of the present invention, the physical dimension of profile is identical with conventional OEMLED collector lens, directly can substitute the LED collector lens 1 on market, but light path and functionally variant: in accompanying drawing 5, the light beam that the hemisphere lamp pearl LEDGlass that dotted line is delineated sends, first light beam D1 is irradiated on reflector R, reflexed to the mirror position of the first light beam D1 by reflector R and propagate in light-guiding pillar S2, the first light beam D1(solid line as in figure) arrow shown in, the first light beam shown in dotted line ' D1 ' is if be---the reflector R not having the present invention to arrange, most energy of the first light beam D1 are refracted to the first light beam shown in dotted line ' direction of arrow of D ', second light beam D2 is irradiated on light-guiding pillar S2 sidewall, meets total reflection condition, is totally reflected to its mirror position and propagates in light-guiding pillar S2, as shown in the arrow of the second light beam D2 in figure, 3rd light beam D3 is irradiated on light-guiding pillar S2 sidewall, and its position is in reflector R and the boundary of not covering light-guiding pillar S2 sidewall, and this point meets total reflection condition, is totally reflected to mirror position and propagates in light-guiding pillar S2, as shown in the arrow of the 3rd light beam D3 in figure.Reflector R reflects the refract light part that light-guiding pillar S2 sidewall (near LED collector lens rear end face OB) leaks, and reduces light loss.In addition, air outside LED collector lens front end face OF, refractive index n=1.0, also can produce reflective with low-angle incidence angle irradiation LED collector lens front end face OF, reflectivity about 4%, but refractive index n '=1.58 ~ 1.59 of many transparent polymer materials, more than 5%., this part reverberation is reverse advances to LED collector lens rear end face OB for the reflectivity caused, 3 common LED concentrator lens structures with reference to the accompanying drawings, reverse light of advancing will be reflected LED collector lens 1 by LED collector lens rear end face OB, cause light loss.The reverse light of advancing leaked is reflected back LED collector lens 1 by this by reflector R of the present invention originally, thus adds the light emission rate of LED collector lens front end face OF.
Shown in the dotted semi-circle lines of half concave ball shape S1(accompanying drawing 4 of LED collector lens 1) and hemisphere lamp pearl LEDGlass between fill gaps optocoupler mixture OCA after, between the hemisphere lamp pearl LEDGlass surface to optocoupler mixture OCA of LED bright dipping encapsulation, the reflectivity of two medium interfaces can reduce significantly.Such as, aforementioned refractive index n=1.478 ~ 1.479(20 DEG C) castor oil and the bright dipping encapsulation medium of refractive index n '=1.5 between reflectance reduction to 0.005%, far below 4.0% original/interface.Owing to experienced by 2 secondary reflections from half concave ball shape S1 surface of hemisphere lamp pearl LEDGlass-optocoupler mixture OCA-LED collector lens 1, after adding optocoupler mixture OCA, significantly reduce out light loss.Example is encapsulated as, the reflectivity R of it and Air Interface with the organosilicon of refractive index n '=1.45
air=3.37%, adopt refractive index n '=1.586 of Merlon (PC), n '=1.59(p.303 ~ 304 of polystyrene (PS), Ni Deliang, Zhang Qihui, " plastic properties with select ", publishing house of East China University of Science, 1994), the reflectivity of air-macromolecule light transmissive material, close to 5.2%, disregards the light transmittance T=91.6% of absorption loss water from half concave ball shape S1 surface of hemisphere lamp pearl LEDGlass-air-LED collector lens 1." hemisphere lamp pearl LEDGlass-optocoupler mixture OCA-LED collector lens 1 half concave ball shape S1 surface " of the present invention structure, if filling refractive index n=1.478 ~ 1.479(20 DEG C) castor oil, hemisphere lamp pearl LEDGlass-optocoupler mixture OCA reflectivity R
oCA< 0.01%, hemisphere lamp pearl LEDGlass inside loses the condition of total reflection, the reflectivity 0.12% on half concave ball shape S1 surface of optocoupler mixture OCA-LED collector lens 1, do not consider 2 secondary reflection light losses 0.13% of Absorption of Medium, the most important thing is that hemisphere lamp pearl LEDGlass inside loses the condition of total reflection, visual field widens whole plane, all can be refracted into the outside of medium from the light radiation of the inner outwards any direction of LED bright dipping encapsulation.
The present invention is according to formula (1), the refractive indices n of two media is less, reflectivity is lower, in order to reduce the reflection loss even eliminated between LED lamp bead to LED collector lens, optocoupler mixture is added in space between LED lamp bead and half concave ball shape of LED collector lens, the refractive index of described optocoupler mixture is close to the refractive index even exceeding LED lamp bead bright dipping encapsulation medium, cause the molecular moiety of the corresponding formula (1) of the refractive indices n(1. reducing two kinds of light transmission mediums inside and outside LED lamp bead), reflectivity between LED lamp bead and LED collector lens (half concave ball shape) is sharply reduced, improve the light transmittance of LED lamp bead and the light-inletting quantity of LED collector lens, 2. the refractive index optically denser medium of bright dipping encapsulation and optocoupler mixture and the reversion of optically thinner medium is caused, the total reflection that thorough elimination LED bright dipping encapsulation is inner, the light vision range of LED component is risen to the limit, i.e. the rising angle of LED bright dipping encapsulation expands to LED bright dipping encapsulation from corresponding with Air Interface 45.585 ° (n '=1.4) ~ 41.81 ° (n '=1.5) and becomes 90 ° after optically thinner medium, the relative spherical corona's area of bright dipping expands to 100% from 25.46% ~ 30.0%.
Accompanying drawing 6 is applicable to the LED optical element of multiple LED lamp bead for the present invention---LED collector lens 2 structural representation of many lamps pearl band reflector.In figure, with LED collector lens 2, the half concave ball shape S1 of multiple LED lamp bead location matches, the profile of it and LED lamp bead LEDGlass is coincide, wrap LED lamp bead LEDGlass light-emitting area during use, and location, the position of multiple half concave ball shape S1 is identical with the LED collector lens of OEM.Light-guiding pillar S2, the light-guiding pillar S2 of single lamp pearl LED collector lens of its structure and accompanying drawing 4, accompanying drawing 5 is similar, and the light-guiding pillar S2 split that its volume and cross section are similar to several single lamp pearl is formed; LED collector lens front end face OF(is dull and stereotyped), the thickness h of LED collector lens front end face OF, LED collector lens rear end face OB(plane), the LED collector lens rear end face OB at LED collector lens 2 and the light-guiding pillar S2 side near LED collector lens rear end face OB add the reflector R combined closely with LED collector lens 2 optical lens optical surface.Light is through the total reflection of over-light-transferring pole S2 side, arrive LED collector lens front end face OF, interface from LED collector lens front end face OF(LED collector lens media plane and air) reflect after outgoing, simultaneously at the interface of LED collector lens front end face OF(LED collector lens media plane and air) reflect, reversely advance to LED collector lens rear end face OB.Because the LED collector lens 2 of band reflector of the present invention adopts transparent polymer material, as Merlon (PC) refractive index n '=1.586, refractive index n '=1.59 of polystyrene (PS), be air outside collector lens front end face OF, its refractive index 1.0, calculate by optics formula (1), reflectivity is 5.13%, after the reverse arrival LED collector lens rear end face OB that advances of the total reflection of this part reverberation through light-guiding pillar S2 side, if LED collector lens 2 does not have reflector R, effusion after being reflected by LED collector lens rear end face OB; The LED collector lens rear end face OB of the band reflector in the present invention has reflector R, the emergent light formed is reflected back (band reflection shield) LED collector lens 2 light-guiding pillar S2 inside by reflector R is reflected from LED collector lens rear end face OB, again advance to LED collector lens front end face OF, increase the exiting light beam intensity of LED collector lens front end face OF.The light of the direct projection half concave ball shape S1 that reflector R prevents multiple LED lamp bead LEDGlass from sending simultaneously, the incidence angle entering light-guiding pillar S2 side is too small, the light beam not meeting total reflection condition is reflected back light-guiding pillar S2 by reflector, prevents from being refracted in air through light-guiding pillar S2 side causing light loss; The incidence angle of the LED lamplight that reflector R cannot relate to is large, meets the total reflection condition of optically denser medium to optically thinner medium.
Accompanying drawing 7(a) be the structural representation of the LED collector lens 1 of single LED lamp bead band reflector of the present invention and scattering layer.Contrast accompanying drawing 7(a) with the LED condensing lens section of the band reflector of accompanying drawing 5 or accompanying drawing 4, both difference is accompanying drawing 7(a) the LED collector lens 1 of band reflector of the present invention and the scattering layer LED collector lens 1 that only makes a farfetched comparison the band reflector of Fig. 5 is at the many one deck scattering layer D of LED collector lens front end face OF.Accompanying drawing 7(a) in, the profile of the band reflector of single LED lamp bead and collector lens 1, the half concave ball shape S1 and LED lamp bead LEDGlass of scattering layer is coincide, and wraps LED lamp bead LedGlass light-emitting area during use.Light-guiding pillar S2, LED collector lens front end face OF(is dull and stereotyped), the thickness h of collector lens front end face OF, collector lens rear end face OB(plane), reflector R combines closely on the LED collector lens rear end face OB at LED collector lens 1 and the light-guiding pillar S2 side near LED collector lens rear end face OB, but must not cover half concave ball shape S1; Scattering layer D on collector lens front end face OF.Accompanying drawing 7(a) appearance and size and market on the size of LED collector lens of general OEM completely compatible, but have function light source being diffuseed to form area source that general LED collector lens does not possess, the reverse reflective and light source led lamp pearl LEDGlass direct irradiation light-guiding pillar S2 possessing reflection LED collector lens front end face OF generation does not meet the LED light of the area part of total reflection condition simultaneously.The reverberation caused due to scattering layer D is more much better than than transparent optical surface, and the reflector R of the LED collector lens 1 in the present invention can obtain more effective forward scattering bright dipping than the LED collector lens 1 of conventional areflexia cover.
Accompanying drawing 7(b) be the structural representation of the LED collector lens 2 of many LED lamp bead band reflector of the present invention and scattering layer.Contrast accompanying drawing 7(b) with the LED collector lens 2 of the band reflector of accompanying drawing 6, both difference is accompanying drawing 7(b) the LED collector lens 2 of many LED lamp bead band reflector of the present invention and the scattering layer LED collector lens 2 that only makes a farfetched comparison many LED lamp bead band reflector of the present invention of Fig. 6 is at the many one deck scattering layer D of front end face OF.Accompanying drawing 7(b) in, the profile of the band reflector of many LED lamp bead and collector lens 2, the half concave ball shape S1 and LED lamp bead LEDGlass of scattering layer is coincide, and wraps LED lamp bead LedGlass light-emitting area during use.Light-guiding pillar S2, LED collector lens front end face OF(is dull and stereotyped), the thickness h of LED collector lens front end face OF, LED collector lens rear end face OB(plane), reflector R combines closely on the LED collector lens rear end face OB at LED collector lens 2 and the light-guiding pillar S2 side near LED collector lens rear end face OB, but must not cover half concave ball shape S1; Scattering layer D on collector lens front end face OF.Accompanying drawing 7(b) appearance and size and market on the size of usual many lamps pearl LED collector lens of OEM completely compatible, have and accompanying drawing 7(a) described same scattering function and advantage, namely have function light source being diffuseed to form area source that general LED collector lens does not possess, the reverse reflective and light source led lamp pearl LEDGlass direct irradiation light-guiding pillar S2 simultaneously possessing reflection LED collector lens front end face OF generation does not meet the LED light of the area part of total reflection condition.The reverberation caused due to scattering layer D is more much better than than transparent optical surface, and in the present invention, the reflector R of the LED collector lens 2 of the band scattering layer of many lamps pearl can obtain more effective forward scattering bright dipping than the LED collector lens 2 of conventional areflexia cover.
Specific embodiment of the invention method is as follows:
The silicone oil of optocoupler mixture-refractive index n=1.4 ~ 1.64 of the present invention or other not volatile, water white liquid, as 201 dimethicones of 25 DEG C of refractive index n=1.390 ~ 1.410, semisolid state thing from liquid state to stiff, the phenyl end hydrogen silicone oil SF2032 of 25 DEG C of refractive index n=1.508, castor-oil plant wet goods, selects the chemicals that viscosity is large, chemical stability is good.LED collector lens with reflector-on original single lamp pearl LED collector lens or the mould of many lamps pearl LED collector lens and the basis of production technology, or on the collector lens basis of OEM market product, increase reflector R at LED collector lens rear end face OB, reflector R area relates to the light-guiding pillar S2 side near LED collector lens rear end face OB.Reflector R can utilize silver mirror effect to be formed, but will ensure uncontaminated half concave ball shape S1, and to the LED collector lens that macromolecular material manufactures, adopt gilding technology to form reflection shield, required consumptive material orange cold foil is commercially available.The LED collector lens of the band reflector in the present invention, overall dimensions and original OEM product measure-alike, the thickness h of collector lens front end face keeps original size, compatible to ensure the installation of product.The preparation method of the LED collector lens-reflector with reflector and scattering layer is with the LED collector lens of band reflector, scattering layer processing adopts: increase scattering layer at the front surface of collector lens front end face OF, scattering layer can be frosted layer or milky film pad pasting, and frosted layer adopts sand polishing to form.
Claims (1)
- The optically-coupled of 1.LED light fixture and the method for conduction loss against sunshine, the device realizing the method comprises circuit board, installation LED component, LED collector lens on circuit boards, hemisphere lamp pearl profile in LED collector lens and LED component is coincide, there is space between these two optical elements, in this space, is filled with optocoupler mixture OCA; At LED collector lens rear end face with near the light-guiding pillar side of LED collector lens rear end face, the reflector be combined with LED collector lens intimate is housed, reverse LED light of advancing is reflexed to LED collector lens front end face by reflector, and does not allow it overflow the side of LED collector lens rear end face and light-guiding pillar; LED component direct light is reflected light-guiding pillar lateral parts and is reflected back light-guiding pillar by reflector, maintains the total reflection of light-guiding pillar, and guides light from the outgoing of LED collector lens front end face; It is characterized in that: the method adopts space between LED lamp bead and half concave ball shape of LED collector lens to add optocoupler mixture, and the refractive index of described optocoupler mixture is 1.4 ~ 1.64, close or exceed the refractive index of LED lamp bead bright dipping encapsulation medium; Optocoupler mixture expands the LED bright dipping relevant with bright dipping luminous flux and encapsulates the cirtical angle of total reflection, increases outgoing spherical crown relative area and visual field; Ensure the total reflection of the light-guiding pillar sidewall of LED collector lens, reduce the reflectivity between LED lamp bead and LED collector lens and reflection loss, improve LED light extraction efficiency; The beam angle of LED bright dipping encapsulation expands to maximum 90 ° from corresponding with Air Interface 45.585 ° ~ 41.81 °; Bright dipping spherical crown relative area is from 25.46% ~ 30.0% largest extension to 100%.
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| CN101929620A (en) * | 2009-11-10 | 2010-12-29 | 陕西科技大学 | Method and device for obtaining line light source |
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| CN101929620A (en) * | 2009-11-10 | 2010-12-29 | 陕西科技大学 | Method and device for obtaining line light source |
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