CN102313243B - Non-imaging LED (light emitting diode) collimation system with compact structure - Google Patents
Non-imaging LED (light emitting diode) collimation system with compact structure Download PDFInfo
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- CN102313243B CN102313243B CN 201110128186 CN201110128186A CN102313243B CN 102313243 B CN102313243 B CN 102313243B CN 201110128186 CN201110128186 CN 201110128186 CN 201110128186 A CN201110128186 A CN 201110128186A CN 102313243 B CN102313243 B CN 102313243B
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Abstract
一种结构紧凑型非成像LED准直系统，涉及非成像LED照明领域，它解决了现有LED照明系统结构复杂、光源发散角大且能量不集中，导致光能利用率低的问题，该系统包括LED准直透镜、LED芯片、透镜、LED衬底和LED封装外壳，LED芯片、LED衬底和LED封装外壳封装成整体结构；LED准直透镜由四个面组成，第一个面为入射面，第二个面和第四个面为全反射面和折射面，第三个面为反射面，LED芯片发出的光线经LED准直透镜的第一个面后入射至第二个面的光线折射，第二个面边缘的光线在第二个面全反射，反射的光线入射至第三个面，第三个面使光线反射后入射至第四个面折射。本发明出射光能量分布均匀。
A compact non-imaging LED collimation system, which relates to the field of non-imaging LED lighting, which solves the problems of the existing LED lighting system, such as complex structure, large divergence angle of the light source and non-concentrated energy, resulting in low utilization rate of light energy. Including LED collimating lens, LED chip, lens, LED substrate and LED package shell, LED chip, LED substrate and LED package shell are packaged into an overall structure; LED collimating lens is composed of four surfaces, the first surface is incident The second and fourth surfaces are total reflection and refraction surfaces, and the third surface is a reflection surface. The light emitted by the LED chip enters the second surface after passing through the first surface of the LED collimator lens. Refraction of light, the light at the edge of the second surface is fully reflected on the second surface, the reflected light is incident on the third surface, and the third surface makes the light reflected and incident on the fourth surface for refraction. The energy distribution of the emitted light in the invention is uniform.
Description
Technical field
The present invention relates to non-imaging LED lighting field.
Background technology
LED has that driving voltage is low, volume is little, lightweight, low in energy consumption, the life-span long, excellent advantages such as color harmony directionality. along with semiconductor LED chip material and preparation technology's continuous progress, the luminous efficiency of LED improves rapidly, and good application prospect is arranged aspect light source.LED be expected to replace incandescent, fluorescent lamp become the 4th generation light source, make illuminating industry face a revolution.The problem that the application of LED in lighting source attracts people's attention most is how to improve the efficient of whole luminaire and light is distributed to satisfy the light distribution requirements of application scenario. therefore needs are simulated and are designed LED encapsulating optical structure, make light from the loss reduction before the package interface outgoing, light be distributed and satisfy the light distribution requirements of application scenario, improve the utilization rate of light. usually adopt the nonimaging optics method to carry out the luminous intensity distribution design to LED light source, as the total reflection that utilizes catadioptric concentration structure to form light obtain the refraction-reflection type concentration structure; Utilize that photonic crystal has to the total reflection of photon not absorption characteristic carry out the design of high efficient LED structure, adopt the method for designing of non-imaging len that the emergent ray of LED is distributed to satisfy light distribution requirements for improving the LED light transmissioning efficiency.The light output surface of more existing LED encapsulation is much to adopt plane or sphere, and such exiting surface causes a lot of light in package surface and air interface generation total reflection, the optical energy loss especially severe, and do not reach desirable lighting requirement.Can also adopt the structures such as reflector, composite parabolic mirror to improve brightness of illumination at even its illumination uniformity of the raisings such as optical tunnel, compound eye structural that generally adopts aspect smooth in present lamp optical system, but these equipment have increased the complexity of illuminator, and simultaneously light is in optical tunnel inner surface Multi reflection and the efficiency of light energy utilization that greatly reduces system by the loss meeting of compound eye structural.
Summary of the invention
Existing LED lighting system structure is complicated, the light source angle of divergence is large and energy is not concentrated in order to solve in the present invention, causes the low problem of the efficiency of light energy utilization, and the non-imaging LED of a kind of compact type colimated light system is provided.
the non-imaging LED of a kind of compact type colimated light system comprises LED collimation lens, LED chip, LED substrate and LED package casing, and described LED chip, LED substrate and LED package casing are packaged into overall structure, described LED collimation lens is comprised of four faces, first face is the plane of incidence, second face is the combination of inner full-reflection face and plane of refraction, the 3rd face is reflecting surface, the 4th face is the combination of inner full-reflection face and plane of refraction, the light that described LED chip sends is incident to second face after first face of LED collimation lens, described light refraction through second face core, the light of second face marginal portion is at the inner full-reflection of second face, the light of described reflection is incident to the 3rd face, the 3rd face makes light be incident to the 4th face refraction after secondary reflection again.
Operation principle of the present invention: the present invention is according to the rim ray principle in the nonimaging optics theory and multiaspect while method for designing (Simultaneous Multiple Surfaces, be called for short SMS) method, the face type of the initial configuration of the LED colimated light system of calculating refraction/total reflection/reflection/refractive non-imaging LED colimated light system (RIXR) type.Then utilize the Zemax optical design software to be optimized design to initial configuration, finally obtain the non-imaging LED colimated light system of optimum structure.Half bore that optimal design obtains RIXR type colimated light system is that 20mm, aspect ratio are 0.25, convergent pencil of rays is 220 °.The LED colimated light system must arrive the visual field, edge through the retrodirected ray trace and can be ± and the root mean square radius of 3.178 ° of point range figures is less than 2.1 μ m, therefore the visual field, edge has reached good focusing effect.After taking into full account the reflection loss at the absorption loss water of material and interface, the efficiency of light energy utilization is up to 85.48%.The colimated light system efficiency of light energy utilization and target face illuminance uniformity after optimization all increase.In addition, based on the LED colimated light system of RIXR structure have that the efficiency of light energy utilization is high, compact conformation, volume are little, be convenient to the characteristics such as application.Key technology of the present invention is the design of LED secondary light-distribution collimation lens, based on two-dimensional design, the rotation of two-dimensional curve wire-wound central symmetry axis obtains non-imaging LED collimation lens, namely will make the energy of incident beam farthest be transferred to receiving terminal, must guarantee the optical extend E of incident beam
iOptical extend E with outgoing beam
oEquate, that is E
i=E
oOwing to having used the rim ray principle, only consider rim ray in design process, the rim ray of emergent light as long as namely guarantee rim ray correspondence that chip sends, the light through outgoing after colimated light system that light within the chip angle of divergence is corresponding so must be within the maximum angle of emergence, and this makes design process greatly simplify.
SMS method for designing of the present invention is a cyclic process in essence, a desirable nonimaging optics face type is to pass through one section given initial curve by a pair of incident and emergent ray, calculated one section curve of another face by initial curve, and then calculate one section curve of the 3rd face, calculate at last next section curve of each face, the end points that should guarantee every section curve of same in design process is smoothly connected, repeatedly the Geometrical Optics from the edge to the center like this is until calculate central shaft.As long as initial parameter and one section initial curve are selected, the shape of LED colimated light system is just substantially definite so, and we can follow according to concrete lighting requirement, and certain rule is adjusted initial parameter and the initial curve section satisfies the specific lighting requirement of user.
Beneficial effect of the present invention:
One, LED colimated light system of the present invention can be collected the light in LED wide-angle light emitting region and obtain to have collimated light beam than small divergence angle, the present invention adopts the mixed structure of RIXR formula, make light path repeatedly folding, the volume and the practicality that have greatly reduced colimated light system are stronger.
Two, the light in the LED colimated light system directly reflects away emergent ray through the upper surface central area part of LED collimation lens and is not blocked, and has reduced to a great extent optical energy loss, has improved the efficiency of light energy utilization.
Three, the good uniformity of LED colimated light system illumination of the present invention, the light that LED chip sends is through after colimated light system, and with a very little angle outgoing, the emergent light Energy distribution is more even.
Description of drawings
Fig. 1 is the structural representation of LED colimated light system of the present invention;
Fig. 2 is the etendue conservation schematic diagram of manifold;
Fig. 3 is the initial designs schematic diagram of LED collimation lens of the present invention;
Fig. 4 is the process schematic diagram that in Fig. 3, edge line pushes away in piecemeal to the center;
Fig. 5 is recursion complete procedure schematic diagram piecemeal in the LED collimating mirror;
Fig. 6 is the rim ray schematic diagram that the marginal point on the left of LED chip of the present invention sends;
Fig. 7 is the rim ray schematic diagram that the marginal point on LED chip of the present invention right side sends;
Fig. 8 is the bottom surface upward view of LED colimated light system of the present invention:
Fig. 9 is the top plan view of LED colimated light system of the present invention.
In figure: 1, LED collimating mirror, 2, LED chip, 3, the LED substrate, 4, the LED package casing, 5, second faces.
The specific embodiment
The specific embodiment one, in conjunction with Fig. 1 and Fig. 2, present embodiment is described, the non-imaging LED of a kind of compact type colimated light system, this system comprises LED collimation lens 1, LED chip 2, LED substrate 3 and LED package casing 4, and described LED chip 1, LED substrate 3 and LED package casing 4 are packaged into overall structure; Described LED collimation lens 1 is comprised of four faces, first face is the plane of incidence, second face 5 is the combination of inner full-reflection face and plane of refraction, the 3rd face is reflecting surface, the 4th face is the combination of inner full-reflection face and plane of refraction, the light that described LED chip 2 sends is incident to second face 5 after first face of LED collimation lens 1, through the light refraction of described second face 5 core, the described light that reflects directly is detected device and receives; Through the light of second the face 5 marginal portion inner full-reflection at second face 5, the light of described reflection is incident to the 3rd face, the 3rd face becomes the very little quasi-parallel light of a beam divergence angle after making light be incident to the 4th face refraction after secondary reflection again, reaches the evenly luminous intensity distribution purpose of collimation of LED.
Also comprised the design parameter of determining LED collimation lens 1 in present embodiment before four faces determining LED collimation lens 1, concrete design parameter comprises the bore D of refractive index n, geometric concentrating ratio C and the LED collimation lens 1 of LED collimation lens material.The computational methods of the bore D of described LED collimation lens are: equate equation E according to optical extend
i=E
o, E wherein
i=2 π Dsin θ
i, E
o=2 π dsin θ
o, θ
o=pi/2, d are the photovoltaic cell bore, obtain the value of the bore D of LED collimation lens 1.
In conjunction with Fig. 2, the line segment of figure medium dip part represents the side of LED chip 2, LED chip 2 has certain thickness, not only the upper surface of chip is luminous, its side is also luminous, but the light that send the side is because the blocking of substrate below LED can not all enter colimated light system, and the light that the side of chip is blocked from top to down is more and more, and the angle of divergence is more and more less from top to down also just to be equivalent to the side of chip.
The specific embodiment two, in conjunction with Fig. 3 to Fig. 7, present embodiment is described, present embodiment is the embodiment of the non-imaging LED of the described a kind of compact type of the specific embodiment one colimated light system:
At first, according to requirements such as targeted customer's collimation system rising angle, energy, uniformities, selected LED light source is its size and the angle of divergence as can be known, according to the requirement of concrete emergent ray dispersion angle, utilize optics expansion invariant conservation, calculate the bore D of colimated light system.In conjunction with Fig. 3, selected initial point A, C, S, M, the structure conic section is through A point and C point.Light AS gives upper surface C point in lower surface D point (the unknown) reflection after the refraction of upper surface A point.In like manner, BS gives upper surface C point in lower surface E point (the unknown) reflection after the refraction of upper surface B point.Utilize the aplanatism principle can obtain D, E two point coordinates.Curve D E is one section ovals.The rim ray LN that send LED chip 2 both sides of the edge, RM is refracted to the C point through one section curve, calculates MN section ovals.Part on the N point is parabola, and the plane of incidence of colimated light system is comprised of ovals and parabola two parts.
Secondly, according to initial curve AC piecemeal recursion obtain curve ED, CC1, EF, by the edge piecemeal in intracardiac pushing away.In conjunction with Fig. 4; Utilize equivalent optical path and catadioptric law to obtain respectively upper surface and each section curve of lower surface, the rest may be inferred inwardly calculates the multiterminal curve from the edge, until calculate to central symmetry axis.
The coordinate of ordering by adjusting A, C, M, S at last changes the global shape of collimating mirror.Total reflection can occur through upper surface in a part of light that described LED chip sends, and then arrives again upper surface through lower surface reflection (lower surface plating reflectance coating), is refracted as last emergent light finally by upper surface.In the communication process of light, light is altogether by upper surface twice, the light total reflection once, refraction once, so upper surface namely as fully reflecting surface also as plane of refraction.A part of light at symmetry axis center does not satisfy total reflection condition at the upper surface place, and this part is designed to common form of lens, and light is directly reflected away.The shape of described LED collimating mirror lower surface core is variable, semicircle for example, parabola all can, specifically select any shape should require with reference to concrete bright dipping selected.The present invention has first adopted semicircular, utilizes again afterwards the parabola shaped distortion of having made the LED colimated light system.Used the rim ray principle in design process, only guaranteed that namely light that two marginal points of light source send is through after colimated light system, become the rim ray of emergent light, as long as satisfy this condition during design, 2, the light source edge light that sends with interior point is through colimated light system, within refracted ray one fixes on the rim ray scope of emergent ray.
Non-imaging colimated light system of the present invention has been used the rim ray principle in design process.Rim ray principle, the light that two marginal points on LED chip 2 are sent become respectively the collimated light beam of positive and negative both direction inclination maximum through the non-imaging colimated light system of LED, still be rim ray when following the rim ray outgoing of incident when namely guaranteeing design.And the light between the point of two edges also can guarantee to get light within the collimated light beam of positive and negative both direction inclination maximum after outgoing.Guaranteed in design process that theoretical logical light rate is 100%.The final non-imaging LED colimated light system that is met condition through design.The caliber size of non-imaging LED colimated light system and thickness can be according to the receiving angle of design and the corresponding adjustment of overall length of device, the solution value is not unique, should consider according to actual conditions to choose the non-imaging LED colimated light system that optimal initial parameter design meets light distribution requirements.
The efficiency of light energy utilization of LED colimated light system of the present invention is high, the divergence half-angle of the LED chip 2 that uses in the present invention is 110 degree, the non-imaging colimated light system of LED can wide-angle be collected the light that LED chip 2 sends, and theoretic collection efficiency is 100%, so the efficiency of light energy utilization is high.Light directly reflects away emergent ray through the upper surface central area part of colimated light system and is not blocked, and has reduced to a great extent optical energy loss, has improved the efficiency of light energy utilization.The good uniformity of illumination.The light that LED chip 2 sends is through after colimated light system, and with a very little angle outgoing, the emergent light Energy distribution is more even.The LED energy-saving effect is remarkable, and its application is more and more extensive, particularly uses very wide in fields such as stage, market illumination, lighting of home, advertising lighting, street lamps.
Claims (4)
1. the non-imaging LED of compact type colimated light system, this system comprises LED collimation lens (1), LED chip (2), LED substrate (3) and LED package casing (4), and described LED chip (2), LED substrate (3) and LED package casing (4) are packaged into overall structure, it is characterized in that, described LED collimation lens (1) is comprised of four faces, first face is the plane of incidence, second face (5) is the combination of inner full-reflection face and plane of refraction, the 3rd face is reflecting surface, the 4th face is the combination of inner full-reflection face and plane of refraction, the light that described LED chip (2) sends is incident to second face (5) after first face of LED collimation lens (1), light refraction through described second face (5) core, through the light of second face (5) marginal portion inner full-reflection at second face (5), the light of described reflection is incident to the 3rd face, the 3rd face makes light be incident to the 4th face refraction after secondary reflection again.
2. the non-imaging LED of a kind of compact type according to claim 1 colimated light system, it is characterized in that, this system determined the design parameter of LED collimation lens (1) before four faces determining LED collimation lens (1), described design parameter comprises the bore D of refractive index n, geometric concentrating ratio C and the LED collimation lens (1) of LED collimation lens (1) material.
3. the non-imaging LED of a kind of compact type according to claim 1 and 2 colimated light system, is characterized in that, the computational methods of the bore D of described LED collimation lens (1) are: equate equation E according to optical extend
i=E
o, E wherein
i=2 π Dsin θ
i, E
o=2 π dsin θ
o, θ
o=pi/2, d are the photovoltaic cell bore, θ
iDispersion angle for LED colimated light system emergent ray; θ
oBe the lighting angle of LED chip, equate that by optical extend equation obtains the value of the bore D of LED collimation lens (1).
4. the non-imaging LED of a kind of compact type according to claim 1 colimated light system, is characterized in that, described the 3rd face is coated with reflectance coating.
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| FR3035228B1 (en) * | 2015-04-14 | 2017-05-26 | Ayrton | OPTICAL SYSTEM |
| CN106678736A (en) * | 2015-12-30 | 2017-05-17 | 佛山市中山大学研究院 | Tooth-shaped lens structure |
| CN105546479A (en) * | 2016-02-01 | 2016-05-04 | 成都恒坤光电科技有限公司 | Lens, lighting lamp and motor vehicle long-range light lighting optical system |
| CN106594674A (en) * | 2016-10-26 | 2017-04-26 | 佛山市中山大学研究院 | Collimating lens based on point light source |
| CN106773493B (en) * | 2017-03-24 | 2019-10-15 | 合肥工业大学 | Projection lighting system based on multi-color LED |
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|---|---|---|---|---|
| CN201377699Y (en) * | 2009-02-27 | 2010-01-06 | 东莞市友美电源设备有限公司 | LED lamp with secondary optical lens |
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