CN103335275A - Method and device for light coupling and light conduction loss prevention of LED luminaire - Google Patents
Method and device for light coupling and light conduction loss prevention of LED luminaire Download PDFInfo
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Abstract
The invention relates to a method and a device for light coupling and light conduction loss prevention of an LED (Light-emitting Diode) luminaire. The method is characterized in that a light coupling agent is added to a gap between an LED lamp bead and a semi-concave sphere of an LED condensing lens, and a refractive index of the light coupling agent approximates to or even exceeds that of a light-emitting packaging medium of the LED lamp bead. According to the method and the device, a material is easy to obtain; a technology is mature; implementation is convenient; a realization mode is diversified; the cost is low; an effect of improving the light-emitting efficiency of the LED luminaire is significant; and the method and the device meet requirements of green illumination, energy conservation and emission reduction.
Description
Technical field
The invention belongs to the light optics field, relate to LED lamp and equipment, particularly the method for the optically-coupled of LED light fixture and conduction loss against sunshine and device thereof.
Background technology
LED becomes important lighting source with its light efficiency height.But LED belongs to spot light, and encapsulation has different greatly with incandescent lamp.In order to draw light effectively, the LED projecting lamp is with the optical collection-beam condensing unit of LED lamp pearl with the special use band concave ball shape shape that is complementary, collected effectively to the great power LED light of four directions emission, and through refraction and the reflection of optical concentration device, with the low-angle outgoing, project very little area, uneven illumination is even, the brightness of lamp luminescence face is too high, produces dazzle, and the LED projecting lamp can only be used for local lighting.
The LED projecting lamp of the market supply of material has formed industrial chain, the parts large-scale production of LED projecting lamp or other LED lamps, and the light fixture manufacturer adopts OEM assembling form to form batch production.The LED collector lens of photoconduction form integrates collection-projection light, has formed mould, moulding production, supply of material one continuous line, and each parts in the LED lamp industrial chain are fixing, and the size of any one parts is changed and may be led one and the moving overall situation.The LED collector lens has single lamp pearl, 3 lamp pearls, 5 lamp pearls, 7 lamp pearls ... and other forms, if adopt the most frequently used 1W LED lamp pearl, they are corresponding 1W, 3W, 5W, 7W respectively ...Wherein the utilization rate of 3W LED 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 reduces significantly.In order to improve the versatility of LED collector lens, also form n W great power LED projecting lamp by n single collector lens, number by the light fixture light-emitting window is adjusted the power of LED projecting lamp, but complexity and the difficulty of assembling rise significantly, and the labour cost accounting in the manufacturing cost improves.
Reduce the dazzle of light source and always adopt frosted glass, the refraction of corrugated glass or milky lampshade, uprise brightness, spot light is area source.People adopt various design improvement LED light fixtures, improve light efficiency.Recognize at present and improve the participation that LED light fixture light efficiency needs optical technology.
Summary of the invention
The present invention is by the basic optical analysis, border refraction, reflection and the total reflection rule of LED lamp pearl bright dipping medium have been studied, optically-coupled by LED lamp pearl and LED light fixture collector lens (being used for ray-collecting-optical concentration/light conduction), reduce the reflectivity between the interface, enlarge LED bright dipping encapsulation effective incidence angle---the cirtical angle of total reflection relevant with the 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 of seeing from the bright dipping encapsulation outside inner (with bright dipping package surface normal) and corresponding border thereof.Leak and create the total reflection method of leaded light post at the light of the leaded light post of LED collector lens, improve LED lamp light extraction efficiency.Utilize the technical measures of this method formation and related components and the structure thereof of device.
Basic functional principle of the present invention is based on light reflectivity R and the transmissivity T relation of transparent medium, and the law of refraction of light medium.Concept related to the present invention, basic function and technical measures have been derived thus.
The computing formula (1) of the reflectivity R on transparent medium surface
Refractive index n when transparent mediums such as glass '=1.5, and the refractive index n of air=1.0, result of calculation is R=0.04, namely each surface reflectivity of glass plate is about 4%, the transmissivity T of water white white glass plate has only 92.16%, so the total reflectivity Rt of colourless white glass plate
The white glass plate=1-T=1-92.16%=7.84%.Special coupling hole on LED lamp pearl and the LED collector lens---the air gap between half concave ball shape is caused from LED lamp bead surface-air-gap-LED collector lens half concave ball shape surface and has been produced two secondary reflections, reflectivity meets formula (1), wherein n ' is the refractive index of the bright dipping encapsulating material of large-power LED light bead, adopt refractive indexes between 1.4～1.5, visible-range iuuminting rate is greater than 99% organosilicon, 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’sin i’=n sin i （2）
Concerned by equation: a side incidence angle or the angle of emergence that refractive index is big are little.According to formula (2), light from the emission of LED tube core, can not surpass 45.585 ° of the critical angles (n '=1.4) of total reflection～41.81 ° (n '=1.5) in the angle incidence angle (led chip side) of bright dipping package surface and normal, total reflection will take place in the light greater than critical angle, and repeatedly total reflection take place until optical energy loss totally at circumference (actual is sphere).According to spherical crown area computing formula, 2 π R
2(1-cos i '), wherein i ' is that spherical crown center (axle) is to the angle at spherical crown edge; Introduce relative spherical crown area S
R=spherical crown area S
S: hemisphere area S
h, relative spherical crown area
S
R=(1－cos i’) （3）
Wherein i ' is that spherical crown center (axle) is to the angle at spherical crown edge.
The incidence angle i ' of corresponding LED lamp pearl light beam inside irradiation dielectric surface.
LED encapsulating material refractive index n '=45.585 ° of 1.4 the cirtical angles of total reflection, spherical crown area relatively
S
R=(1－cos 45.585°)=30.0%，
LED encapsulating material refractive index n '=41.81 ° of the critical angles of 1.5 total reflection, spherical crown area relatively
S
R=(1－cos 41.81°)=25.5%。
Above analytical calculation is found, effective bright dipping sectional area of large power white light LED printing opacity packaging plastic is subjected to the influence of the cirtical angle of total reflection, between 30.0%～25.5%, most of radiation in the actual package has exceeded the cirtical angle of total reflection, can only can not form effective bright dipping at sphere (bright dipping encapsulation inner surface) interreflection.
In addition, half concave ball shape of LED lamp pearl direct irradiation LED collector lens rear end face, light enters the leaded light post; The light beam that near half concave ball shape leaded light post exists quite a few not satisfy total reflection condition is reflected outside the cylinder by leaded light post side; Collector lens front end face (outgoing end face) has caused transmission loss with the reverberation of the interface generation of air.
The present invention is according to the relation of reflectance formula (1), the refractive indices n of two media is more little, reflectivity R is more low, in order to reduce even to eliminate LED lamp pearl to the reflection loss between the LED collector lens, the optocoupler mixture is added in space between half concave ball shape of LED lamp pearl and LED collector lens, the refractive index of described optocoupler mixture approaches even surpasses the refractive index of LED lamp pearl bright dipping encapsulation medium, cause the molecular moiety of the corresponding formula of refractive indices n((1) that 1. reduces the inside and outside two kinds of light transmission mediums of LED lamp pearl), reflectivity between LED lamp pearl and the LED collector lens (half concave ball shape) is sharply reduced, improve the light transmittance of LED lamp pearl and the light-inletting quantity of LED collector lens; 2. according to formula (2), change the refractive index n of optically thinner medium, will cause the incidence angle of optically denser medium side or the variation of the angle of emergence; Extrapolate accordingly, the light beam that sends from the optically denser medium side is at the critical angle i of dielectric surface generation total reflection
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 the optically denser medium
c' become big, as the light beam cirtical angle of total reflection i in the glass of n '=1.5
c', when the refractive index n=1.0(air of optically thinner medium), the cirtical angle of total reflection i in the optically denser medium
c'=41.81 °, change the water of refractive index n=1.33 into when optically thinner medium after, the cirtical angle of total reflection i in the optically denser medium
c'=62.46 °, corresponding relative spherical crown area S
R=1-cos 62.46 °=53.76%; If select water white castor oil, as castor oil refractive index n=1.478～1.479(20 ℃ of India's supply of material), after the glass coupling of itself and n '=1.5, the cirtical angle of total reflection i in the glass
c'=80.17 °～80.40 °, cirtical angle of total reflection i
c' the spherical crown surface area that forms accounts for hemispherical 83.15%(relative surface area), be glass and air cirtical angle of total reflection i
c' 3.26 times of the spherical crown area that forms; 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 ° (angles of grazing), reflectivity R=40%～100% of natural daylight, weighted average reflectivity about 70% is so it is little to the optical transmission effectiveness affects to continue to enlarge the cirtical angle of total reflection.LED lamp pearl is used in this analysis popularization, and the light in the lamp pearl bright dipping encapsulation takes place to reflect and reflect in package surface, surpasses cirtical angle of total reflection i
c' light can only be along the reflection of the inner periphery of ball until loss totally; Improve the refractive index n of the peripheral medium of led chip, can enlarge the cirtical angle of total reflection i in the LED bright dipping encapsulation
c', thereby the relative area of the bright dipping spherical crown of the effective angle of departure in the raising bright dipping encapsulation circle and correspondence makes the inner cirtical angle of total reflection i of surpassing of LED
c' area become very little; Further measure, after original optically thinner medium made into refractive index n and be higher than optically denser medium, optically thinner medium and optically denser medium have been exchanged the position, be the refractive index n of LED bright dipping encapsulation ' behind the refractive index n less than the optocoupler mixture, total reflection can not take place in the light that sends in the LED bright dipping encapsulation, and this just can greatly improve the light extraction efficiency of high-power LED chip.After adding the optocoupler mixture, the reflectivity that the LED bright dipping is encapsulated between two media of optocoupler mixture can reduce significantly, for example, aforementioned refractive index n=1.478～1.479(20 ℃) castor oil and refractive index n '=reflectivity between 1.5 the glass is reduced to 0.005%.
The present invention derives and analytical calculation according to above-mentioned theory, and corresponding experimental verification, obtained the light extraction efficiency of the legal raising of optocoupler LED wick, reduce light fixture equipment interface reflecting rate, the present invention uses water white optocoupler mixture, described optocoupler mixture refractive index 1.4～1.64.After making the beam angle of LED bright dipping encapsulation expand to LED bright dipping encapsulation and become optically thinner medium from corresponding with air interface 45.585 ° (n '=1.4)～41.81 ° (n '=1.5) 90 °; Bright dipping spherical crown relative area expands to 100% from 25.46%～30.0%.
Half concave ball shape of LED lamp pearl irradiation LED collector lens also enters the leaded light post, and the light of close LED collector lens rear end face and half recessed spheroid is difficult to satisfy total reflection condition and is leaked in the side air of leaded light post.The present invention adopts light that bounce technique will not satisfy the cirtical angle of total reflection by in the special minute surface reflected back leaded light post, and in the leaded light post of the reflector reflected back LED collector lens that arranges by LED collector lens rear end face of the retrodirective reflection light that LED collector lens front end face is caused.The equipment of bounce technique correspondence of the present invention is the LED collector lens of band reflection shield, and reflector is worn in LED collector lens rear end.According to the purposes difference, the LED collector lens of described band reflector divides two classes: a class is formed the LED optical equipment that throws usefulness by LED collector lens structure+reflector, another kind ofly forms the LED optical equipment that diffusion is used by LED collector lens structure+reflector+scattering layer.
The used equipment of the present invention: 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, and to select refractive index be 1.4 dimethicone, and the encapsulation of the high-powered LED lamp bright dipping at present organosilicons that adopt with the material coupling of optocoupler mixture more; The optocoupler mixture can also be selected the phenyl end hydrogen silicone oil of refractive index 1.5,1.64 refraction oil according to the actual refractive index of LED bright dipping encapsulation for use.The LED collector lens of band reflector on the basis of common LED collector lens commonly used, a class LED collector lens rear end face and near LED collector lens leaded light post side set up reflector; Another kind of LED collector lens rear end face and near LED collector lens leaded light post side set up reflector, and set up scattering layer at LED collector lens front end face, scattering layer can form or pad pasting forms with the frosted treatment process.Material of the present invention is easy to get, technical maturity, and it is convenient to implement, and the implementation variation is with low cost, and the effect of raising LED light fixture light extraction efficiency is remarkable, meets the requirement of green illumination, energy-saving and emission-reduction.
Description of drawings
The n=1.0 that accompanying drawing 1 is quoted for the present invention and the transparent medium boundary reflection rate curve figure of n '=1.5.
Accompanying drawing 2 is geometrical relationship figure and the cirtical angle of total reflection corresponding spherical crown schematic diagram of the present invention about spherical crown.
Accompanying drawing 3 is the LED collector lens structural representation of great power LED projecting lamp single lamp pearl commonly used.
Accompanying drawing 4 is main optical element 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 collector lens structural representation of many lamps pearl band reflector of the present invention.
Accompanying drawing 7(a) is single lamp pearl band reflector of the present invention and scattering layer LED collector lens structural representation.
Accompanying drawing 7(b) is many lamps pearl band reflector of the present invention and scattering layer LED collector lens structural representation.
The specific embodiment
Set forth the present invention below in conjunction with accompanying drawing.
The theory of computation of foundation of the present invention and derivation thereof:
The law of refraction
n’sin i’=n sin i （2）
According to formula (2), a side incidence angle or the angle of emergence that refractive index is big are little.Light from the emission of LED tube core, angle at bright dipping package surface and normal---incidence angle (led chip side) can not surpass 45.585 ° of the critical angles (bright dipping encapsulation refractive index n '=1.4) of total reflection～41.81 ° (bright dipping encapsulation refractive index n '=1.5), total reflection will take place in the light greater than critical angle, and repeatedly total reflection take place until optical energy loss totally along circumference (sphere).
Accompanying drawing 2 is that the present invention is about the geometric representation of spherical crown and the schematic diagram of the corresponding spherical crown of the cirtical angle of total reflection.Known spherical crown area S
S=2 π RH, wherein R be the centre of sphere to the radius length on ball surface, 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-cos i '), wherein i ' is the angle at z axle (spherical crown center) and edge, spherical crown base, so spherical crown area computing formula S
S=2 π R
2(1-cos i '); Introduce relative spherical crown area S
R=spherical crown area S
S: hemisphere area S
h, relative spherical crown area
S
R=(1－cos i’) （3）
Wherein i ' is the angle at z axle (spherical crown center) and edge, spherical crown base.Like this, the surface area of spherical crown directly is expressed as the centre of sphere to the relation of the angle i ' at edge, spherical crown base.
LED lamp pearl inner light beam irradiation bright dipping encapsulation medium surface, incidence angle i ' is the angle of bright dipping package surface normal and LED light beam.LED bright dipping encapsulating material has been played the part of 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 takes place is: the angle i=90 of air side °, and by formula (2), the inner cirtical angle of total reflection i of bright dipping encapsulation
c' and sin i
c'=nsin i/n ' direct correlation.For LED bright dipping encapsulation (light-emitting window) borderline any 1 O, incidence angle i ' from inside to outside owing in the white light LEDs sealing YAG fluorescent material is arranged, can produce diffused light, the bright dipping packaging plastic can produce stress, microbubble when solidifying, cause the bright dipping encapsulation to have diffused features.Doing the section of any 1 O of bright dipping package surface, shown in the horizontal profile that accompanying drawing 2 is crossed the centre ofs sphere, is that the neighborhood of the centre of sphere is made hemisphere face with O, and the incident beam of any direction is running orbit radially, with the angle i ' of section normal direction.According to reflection law, reverberation becomes mirror image with incident light, and angle of reflection and incidence angle equal and opposite in direction are as the reflection dotted arrow indication of accompanying drawing 2.Cirtical angle of total reflection i in the LED bright dipping encapsulation
c', surround corresponding spherical crown, then cirtical angle of total reflection i as the Rdi ' endless belt of accompanying drawing 2
c' surrounded a spherical crown that definite relative area is arranged.Greater than cirtical angle of total reflection i
c' light all can not appear in the visual field." visual field " described herein is: the limit angle of the bright dipping encapsulation of seeing from the bright dipping encapsulation outside inner (with bright dipping package surface normal) and corresponding border thereof.
At present, the bright dipping encapsulating material of great power LED device adopts the organosilicon (resin) of 200 ℃ of good light permeability and heatproofs in a large number, its refractive index n ' between 1.4～1.5, n '=1.40 as 201 dimethicones, phenyl end hydrogen silicone oil divides n '=1.50 the different trades mark with 1.51, the n ' of hydrogeneous MQ silicones=1.30～1.48, phenyl end hydrogen silicones refractive index n ' have 1.44,1.45,1.49,1.50,1.51 the multiple trade mark is arranged.If the bright dipping encapsulating material refractive index n of large-power LED light bead '=1.4,45.585 ° of the corresponding cirtical angles of total reflection, its relative spherical crown area
S
R=(1－cos 45.585°)=30.0%，
If the bright dipping encapsulating material refractive index n of large-power LED light bead '=1.5,41.81 ° of the critical angles of corresponding total reflection, spherical crown area relatively
S
R=(1－cos 41.81°)=25.5%。
Found by above analytical calculation, effective bright dipping relative area of large power white light LED printing opacity packaging plastic is subjected to the influence of the cirtical angle of total reflection, between 30.0%～25.5%, the neighborhood of any 1 O of LED bright dipping package surface, only dropping on the light that the point on the spherical crown sends just may be by the outgoing of O point, and wherein the most of radiation on this neighborhood have all surpassed cirtical angle of total reflection i
c', they arrive the radiation that O orders and can only lose by interreflection in sphere.Introducing the concept of " visual field ", is the boundary with the cirtical angle of total reflection, and " visual field " following LED light can't overflow the LED encapsulation forever.If can enlarge the critical angle of total reflection, also just can enlarge visual field, draw the light radiation of more led chip.The present invention is based on the inner most light radiation of led chip and can't draw the encapsulation fact out-of-bounds by the bright dipping encapsulation, the expansion visual field that looks for another way, the light emission rate of raising LED.
According to law of refraction formula (2), change the refractive index n of optically thinner medium, will cause the incidence angle of optically denser medium side or the variation of the angle of emergence; Reach a conclusion accordingly: the light beam that sends from the optically denser medium side is at the critical angle i of dielectric surface generation total reflection
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 the optically denser medium
c' become big, as the glass of n '=1.5 or the cirtical angle of total reflection i of the interior outgoing beam of macromolecule light transmissive material
c', when the refractive index n=1.0(air of optically thinner medium), the cirtical angle of total reflection i in the optically denser medium
c'=41.81 °, corresponding relative spherical crown area S
R=1-cos41.81 °=25.5%; Change the water of refractive index n=1.33 into when optically thinner medium after, the cirtical angle of total reflection i in the optically denser medium
c'=62.46 °, corresponding relative spherical crown area S
R=1-cos 62.46 °=53.76%, and vision range is original 2.1 times; If select water white castor oil, as castor oil refractive index n=1.478～1.479(20 ℃ of India's supply of material), after the glass coupling of itself and n '=1.5, the cirtical angle of total reflection i in the glass
cIt is hemispherical 83.15% that '=80.17 °～80.40 °, the spherical crown surface area that the cirtical angle of total reflection forms account for, and is glass and air cirtical angle of total reflection i
c' 3.26 times of the spherical crown area that forms; The natural daylight of incidence angle i '=80 °～90 ° at the reflectivity of glass and air surface up to 40%～100%, the hemispherical relatively area 17.36% of the banded spherical area of this part, with reference to the accompanying drawings 1, under incidence angle i=80 °～90 ° angles of grazing, the reflectivity 40%～100% of the natural daylight at the glass of n=1.5 and the interface of air, mean value is up to 70%, even the refringence that adds glass and water has only the correction of the influence of the reflectivity of Δ n=0.17, the average natural reflectivity in this zone estimates also have 50%, therefore, continue to enlarge cirtical angle of total reflection i
c' the optical transmission effectiveness affects is diminished.
LED lamp pearl is used in this analysis popularization, and the interior light of lamp pearl bright dipping encapsulation takes place to reflect and reflect in package surface, and the light that surpasses the cirtical angle of total reflection reflects until loss totally along the inner periphery of ball always; Improve the refractive index n of the peripheral medium of LED lamp pearl, can enlarge on the LED bright dipping package interface cirtical angle of total reflection i of (O) more arbitrarily
c', thereby the relative area of the effective incidence angle in the lifting bright dipping encapsulation circle and corresponding effective bright dipping spherical crown thereof, reach the purpose of expansion " visual field ", and making the inner area that surpasses the cirtical angle of total reflection of LED become very little, the peripheral medium of LED lamp pearl described herein is optocoupler mixture of the present invention; Further, after the optocoupler mixture of original optically thinner medium made into refractive index n and be higher than optically denser medium, optically thinner medium and optically denser medium have been exchanged the position, the refractive index n of LED bright dipping encapsulation ' behind the refractive index n less than the optocoupler mixture, the total reflection that will not exist the LED light beam to cause in LED bright dipping package surface (led chip side), make the outgoing visual field of any 1 O of LED bright dipping package surface become whole plane, this greatly improves the light extraction efficiency of high-power LED chip.
Accompanying drawing 3 is the LED collector lens structural representation of great power LED projecting lamp single lamp pearl commonly used.Among the figure, shown in the semicircle dotted line of LED collector lens 1, the half concave ball shape S1(of single led lamp pearl), its profile with LED lamp pearl LED Glass is coincide, and wraps among the supporting LED lamp pearl LED Glass(figure picture during use) light-emitting area.Leaded light post S2, LED collector lens front end face OF(flat board), the thickness h of LED collector lens front end face OF, LED collector lens rear end face OB(plane).
Accompanying drawing 4 is main optical element assembly structure schematic diagram of the present invention.Among the figure, circuit board PCB, LED device LED Chip install (welding) on circuit board PCB, and hemisphere lamp pearl LED Glass protrudes on LED device LED Chip surface; The LED collector lens 1 of single led lamp pearl, shown in the semicircle dotted line of half concave ball shape S1() coincide with the profile of the hemisphere lamp pearl LED Glass of LED device LED Chip, wrap the exiting surface of LED lamp pearl LED Glass during use, but there is the space between two optical elements, has been filled with optocoupler mixture OCA.The refractive index n of optocoupler mixture OCA is near the refractive index n of hemisphere lamp pearl LED Glass '; Leaded light post S2, LED collector lens front end face OF(flat board), the thickness h of LED collector lens front end face OF, LED collector lens rear end face OB(plane), these structures, size are all interior identical at the LED collector lens 1 of common single led lamp pearl with the great power LED projecting lamp of accompanying drawing 3, leaded light post S2 guides to LED collector lens front end face OF(flat board with the LED photoconduction that receives), be mapped to outside the lamp through reflecting; The present invention has increased the reflector R that combines closely with LED collector lens 1 optical lens optical surface in the leaded light post S2 side of the LED of LED collector lens 1 collector lens rear end face OB and close LED collector lens rear end face OB, reflector R reflexes to LED collector lens front end face OF with reverse LED light of advancing, and does not allow it overflow the side of LED collector lens rear end face OB and leaded light post S2.
Accompanying drawing 5 is LED collector lens light path and the operation principle schematic diagram of band reflector of the present invention.Among the figure, the mark in each word marking of same area and accompanying drawing 3 and the accompanying drawing 4 is identical.To the common LED collector lens 1 of as shown in Figure 3 OEM, the half concave ball shape S1 of LED lamp pearl LED Glass direct irradiation LED collector lens rear end face OB, light enters leaded light post S2; Near half concave ball shape S1 leaded light post S2 does not satisfy the light beam of total reflection condition, is reflected outside the cylinder of leaded light post S2 by leaded light post side.The LED collector lens 1 of band reflection shield of the present invention, the physical dimension of profile is identical with OEM LED collector lens commonly used, can directly substitute the LED collector lens 1 on the market, but it is variant on light path and the function: in the accompanying drawing 5, the light beam that the hemisphere lamp pearl LED Glass that dotted line is delineated sends, the first light beam D1 shines on the reflector R, the cover R that is reflected reflexes to the mirror position of the first light beam D1 and propagates in leaded light post S2, as the first light beam D1(solid line among the figure) arrow shown in, the direction of arrow of first light beam shown in the dotted line ' D1 ' is if be---the reflector R that does not have the present invention to arrange, most energy of the first light beam D1 are refracted to first light beam shown in the dotted line ' D '; The second light beam D2 shines on the leaded light post S2 sidewall, satisfies total reflection condition, is totally reflected to its mirror position and propagates in leaded light post S2, shown in the arrow of the second light beam D2 among the figure; The 3rd light beam D3 shines on the leaded light post S2 sidewall, and its position is in reflector R and the boundary of not covering leaded light post S2 sidewall, and this point satisfies total reflection condition, is totally reflected to mirror position and propagates in leaded light post S2, shown in the arrow of the 3rd light beam D3 among the figure.Reflector R has reflected the refract light part that leaded light post S2 sidewall (near LED collector lens rear end face OB) leaks, and has reduced the light loss consumption.In addition, the LED collector lens front end face OF outside is air, refractive index n=1.0, OF also can produce reflective with low-angle incidence angle irradiation LED collector lens front end face, about reflectivity 4%, but the refractive index n of many transparent polymer materials '=1.58～1.59, the reflectivity that causes surpasses 5%. this part the reverse LED of the advancing to collector lens of reverberation rear end face OB, 3 common LED collector 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 the light loss consumption.Reflector R of the present invention is this reverse light reflected back LED collector lens 1 of advancing that originally will leak, thereby increased the light emission rate of LED collector lens front end face OF.
Shown in the semicircle dotted line of half concave ball shape S1(accompanying drawing 4 of LED collector lens 1) and hemisphere lamp pearl LED Glass between the space fill optocoupler mixture OCA after, the hemisphere lamp pearl LED Glass surface of LED bright dipping encapsulation can reduce significantly to the reflectivity of two medium interfaces between the optocoupler mixture OCA.For example, aforementioned refractive index n=1.478～1.479(20 ℃) castor oil and refractive index n '=reflectivity between 1.5 the bright dipping encapsulation medium is reduced to 0.005%, far below 4.0% original/interface.Owing to experienced 2 secondary reflections from half concave ball shape S1 surface of hemisphere lamp pearl LED Glass-optocoupler mixture OCA-LED collector lens 1, add optocoupler mixture OCA after, reduced significantly and light loss.With refractive index n '=1.45 organosilicon is encapsulated as example, the reflectivity R of it and air interface
Air=3.37%, adopt the refractive index n of Merlon (PC) '=1.586, n '=1.59(p.303～304 of polystyrene (PS), Ni Deliang, Zhang Qihui, " plastic properties with select for use ", publishing house of East China University of Science, 1994), the reflectivity of air-macromolecule light transmissive material is near 5.2%, from hemisphere lamp pearl LED Glass-air-the light transmittance T=91.6% of absorption loss water is disregarded on half concave ball shape S1 surface of LED collector lens 1.If " half concave ball shape S1 surface of hemisphere lamp pearl LED Glass-optocoupler mixture OCA-LED collector lens 1 " of the present invention structure is filling refractive index n=1.478～1.479(20 ℃) castor oil, hemisphere lamp pearl LED Glass-optocoupler mixture OCA reflectivity R
OCA＜0.01%, hemisphere lamp pearl LED Glass inside has lost 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 the 2 secondary reflection light losses 0.13% that medium absorbs, the most important thing is that hemisphere lamp pearl LED Glass inside has lost the condition of total reflection, visual field is widened whole plane, all can be refracted into the outside of medium from the inner outwards light radiation of any direction of LED bright dipping encapsulation.
The present invention is according to formula (1), the refractive indices n of two media is more little, reflectivity is more low, in order to reduce even to eliminate LED lamp pearl to the reflection loss between the LED collector lens, the optocoupler mixture is added in space between half concave ball shape of LED lamp pearl and LED collector lens, the refractive index of described optocoupler mixture approaches even surpasses the refractive index of LED lamp pearl bright dipping encapsulation medium, cause the molecular moiety of the corresponding formula of refractive indices n((1) that 1. reduces the inside and outside two kinds of light transmission mediums of LED lamp pearl), reflectivity between LED lamp pearl and the LED collector lens (half concave ball shape) is sharply reduced, improve the light transmittance of LED lamp pearl and the light-inletting quantity of LED collector lens; 2. cause the refractive index optically denser medium of bright dipping encapsulation and optocoupler mixture and the counter-rotating of optically thinner medium, thoroughly eliminate the inner total reflection of LED bright dipping encapsulation, the light vision range of LED device is risen to the limit, i.e. after the rising angle of LED bright dipping encapsulation expands to LED bright dipping encapsulation and becomes optically thinner medium from corresponding with air interface 45.585 ° (n '=1.4)～41.81 ° (n '=1.5) 90 °; The relative spherical crown area of bright dipping expands to 100% from 25.46%～30.0%.
Accompanying drawing 6 is learned part for the LED light that the present invention is fit to a plurality of LED lamp pearls---LED collector lens 2 structural representations of many lamps pearl band reflector.Among the figure, with LED collector lens 2, the half concave ball shape S1 of a plurality of LED lamp pearl location matches, the profile of it and LED lamp pearl LED Glass is coincide, wrap LED lamp pearl LED Glass light-emitting area during use, and location, the position of a plurality of half concave ball shape S1 is identical with the LED collector lens of OEM.Leaded light post S2, the leaded light post S2 of single lamp pearl LED collector lens of its structure and accompanying drawing 4, accompanying drawing 5 is similar, and the leaded light post S2 amalgamation that its volume and cross section are similar to several single lamp pearls forms; LED collector lens front end face OF(flat board), the thickness h of LED collector lens front end face OF, LED collector lens rear end face OB(plane), increased the reflector R that combines closely with LED collector lens 2 optical lens optical surfaces in the leaded light post S2 side of the LED of LED collector lens 2 collector lens rear end face OB and close LED collector lens rear end face OB.Light is through the total reflection of leaded light post 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) refraction back outgoing, while is at the interface of LED collector lens front end face OF(LED collector lens media plane and air) reflection, the reverse LED collector lens rear end face OB that advances to.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, the refractive index n of polystyrene (PS) '=1.59, collector lens front end face OF outside is air, its refractive index 1.0, pressing optics formula (1) calculates, reflectivity is 5.13%, this part reverberation is behind the reverse arrival LED collector lens rear end face OB that advances of the total reflection of leaded light post S2 side, if LED collector lens 2 does not have reflector R, will be overflowed by LED collector lens rear end face OB refraction back; The LED collector lens rear end face OB of the band reflector among the present invention has reflector R, the be reflected leaded light post S2 inside of cover R reflected back (the band reflection shield) LED collector lens 2 of the emergent light that forms from LED collector lens rear end face OB refraction, again advance to LED collector lens front end face OF, increased the emergent light intensity of LED collector lens front end face OF.Reflector R prevents the light of the direct projection half concave ball shape S1 that a plurality of LED lamp pearl LED Glass send simultaneously, the incidence angle that enters leaded light post S2 side is too small, the light beam that the does not meet total reflection condition cover reflected back leaded light post S2 that is reflected prevents from being refracted to through leaded light post S2 side in the air and causes light loss; The incidence angle of the LED light that reflector R can't relate to is big, satisfies optically denser medium to the total reflection condition of optically thinner medium.
Accompanying drawing 7(a) is the structural representation of the LED collector lens 1 of single LED lamp pearl band reflector of the present invention and scattering layer.Contrast accompanying drawing 7(a) with the LED collector lens part 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 scattering layer only make a farfetched comparison Fig. 5 the band reflector LED collector lens 1 LED collector lens front end face OF many one deck scattering layer D.Accompanying drawing 7(a) in, the profile of the band reflector of single LED lamp pearl and the collector lens of scattering layer 1, half concave ball shape S1 and LED lamp pearl LED Glass is coincide, and wraps LED lamp pearl Led Glass light-emitting area during use.Leaded light post S2, LED collector lens front end face OF(flat board), the thickness h of collector lens front end face OF, collector lens rear end face OB(plane), reflector R combines closely at the LED of LED collector lens 1 collector lens rear end face OB with near on the leaded light post S2 side of LED collector lens rear end face OB, but must not cover half concave ball shape S1; Scattering layer D on the collector lens front end face OF.Accompanying drawing 7(a) size of the LED collector lens of general OEM is compatible fully on appearance and size and the market, but have the function that light source is diffuseed to form area source that general LED collector lens does not possess, the reverse reflective and light source led lamp pearl LED Glass direct irradiation leaded light post S2 that possesses reflection LED collector lens front end face OF generation does not simultaneously satisfy the LED light of the area part of total reflection condition.Because the reverberation that scattering layer D causes is more much better than than transparent optical surface, the reflector R of the LED collector lens 1 among the present invention can obtain more effective forward scattering bright dipping than the LED collector lens 1 of areflexia cover commonly used.
Accompanying drawing 7(b) is the structural representation of the LED collector lens 2 of many LED lamp pearl 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 pearl band reflector of the present invention and scattering layer only make a farfetched comparison Fig. 6 many LED lamp pearl band reflector of the present invention LED collector lens 2 front end face OF many one deck scattering layer D.Accompanying drawing 7(b) in, the profile of the band reflector of many LED lamp pearl and the collector lens of scattering layer 2, half concave ball shape S1 and LED lamp pearl LED Glass is coincide, and wraps LED lamp pearl Led Glass light-emitting area during use.Leaded light post S2, LED collector lens front end face OF(flat board), the thickness h of LED collector lens front end face OF, LED collector lens rear end face OB(plane), reflector R combines closely at the LED of LED collector lens 2 collector lens rear end face OB with near on the leaded light post S2 side of LED collector lens rear end face OB, but must not cover half concave ball shape S1; Scattering layer D on the collector lens front end face OF.Accompanying drawing 7(b) size of many lamps pearl LED collector lens of OEM is compatible fully usually on appearance and size and the market, have and accompanying drawing 7(a) described same scattering function and advantage, namely have the function that light source is diffuseed to form area source that general LED collector lens does not possess, the reverse reflective and light source led lamp pearl LED Glass direct irradiation leaded light post S2 that possesses reflection LED collector lens front end face OF generation does not simultaneously satisfy the LED light of the area part of total reflection condition.Because the reverberation that scattering layer D causes is more much better than than transparent optical surface, 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 areflexia cover commonly used among the present invention.
Specific implementation method of the present invention is as follows:
The silicone oil of optocoupler mixture-refractive index n of the present invention=1.4～1.64 or other not volatile, water white liquid, 201 dimethicones as 25 ℃ of refractive index n=1.390～1.410, semisolid attitude thing from the liquid state to the stiff, the phenyl end hydrogen silicone oil SF2032 of 25 ℃ of refractive index n=1.508, the castor-oil plant wet goods is selected the chemicals that viscosity is big, chemical stability is good.The LED collector lens of band reflector-on the basis of the mould of original single lamp pearl LED collector lens or many lamps pearl LED collector lens and production technology, perhaps 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 leaded light post S2 side near LED collector lens rear end face OB.Reflector R can utilize the silver mirror effect to form, but will guarantee uncontaminated half concave ball shape S1, to the LED collector lens that macromolecular material is made, adopts gilding technology to form reflection shield, and required consumptive material orange cold foil market is on sale.The LED collector lens of the band reflector among the present invention, overall dimensions and original OEM product measure-alike, the thickness h of collector lens front end face keeps original size, to guarantee the installation compatibility of product.The preparation method of the LED collector lens-reflector of band reflector and scattering layer is with the LED collector lens of band reflector, scattering layer processing is adopted: the front surface at collector lens front end face OF increases scattering layer, scattering layer can be frosted layer or milky film pad pasting, and the frosted layer adopts the sand polishing to form.
Claims (5)
1. the method for the optically-coupled of LED light fixture and conduction loss against sunshine is characterized in that:
The optocoupler mixture is added in space between half concave ball shape of LED lamp pearl and LED collector lens, and the refractive index of described optocoupler mixture approaches even surpass the refractive index of LED lamp pearl bright dipping encapsulation medium; The optocoupler mixture enlarges the LED bright dipping encapsulation cirtical angle of total reflection relevant with the bright dipping luminous flux, increases outgoing spherical crown relative area and visual field; Guarantee the total reflection of the leaded light post sidewall of LED collector lens, reduce reflectivity and reflection loss between LED lamp pearl and the LED collector lens, improve LED lamp light extraction efficiency.
2. method according to claim 1, it is characterized in that: the refractive index of optocoupler mixture is 1.4～1.64.
3. according to claim 1 or the described method of claim 2, it is characterized in that: the beam angle of LED bright dipping encapsulation expands to maximum 90 ° from corresponding with air interface 45.585 ° (n '=1.4)～41.81 ° (n '=1.5); Bright dipping spherical crown relative area is from 25.46%～30.0% largest extension to 100%.
4.LED the optically-coupled of light fixture and the device of conduction loss against sunshine, comprise circuit board, be installed in the LED device on the circuit board, the LED collector lens, hemisphere lamp pearl profile in LED collector lens and the LED device is coincide, have the space between these two optical elements, it is characterized in that: in this space filling optocoupler mixture OCA.
5. device according to claim 1, it is characterized in that: at LED collector lens rear end face with near the leaded light post side of LED collector lens rear end face the reflector of being combined with LED collector lens intimate is housed, reflector reflexes to LED collector lens front end face with reverse LED light of advancing, and does not allow it overflow the side of LED collector lens rear end face and leaded light post; Reflector reflects leaded light post lateral parts reflected back leaded light post with LED device direct light, the total reflection that has kept the leaded light post, and guiding light is from the outgoing of LED collector lens front end face.
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| CN111609378A (en) * | 2019-02-25 | 2020-09-01 | 浙江宇视科技有限公司 | Light filling lens and camera equipment |
| CN112145986A (en) * | 2020-07-31 | 2020-12-29 | 中节能晶和科技有限公司 | Manufacturing method of high-luminous-efficiency lamp |
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| US20070273984A1 (en) * | 2006-05-25 | 2007-11-29 | Industrial Technology Research Institute | Light Guide Lens and Light Emitting Diode Package Structure having the Light Guide Lens |
| CN101418927A (en) * | 2007-10-24 | 2009-04-29 | 富士迈半导体精密工业（上海）有限公司 | Light source assembly |
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| CN111609378A (en) * | 2019-02-25 | 2020-09-01 | 浙江宇视科技有限公司 | Light filling lens and camera equipment |
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