CN101576231A - Center light-splitting reflective optical unit and system, and manufacturing method thereof - Google Patents
Center light-splitting reflective optical unit and system, and manufacturing method thereof Download PDFInfo
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- CN101576231A CN101576231A CNA2009100377153A CN200910037715A CN101576231A CN 101576231 A CN101576231 A CN 101576231A CN A2009100377153 A CNA2009100377153 A CN A2009100377153A CN 200910037715 A CN200910037715 A CN 200910037715A CN 101576231 A CN101576231 A CN 101576231A
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- curved surface
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- reflective optical
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/0025—Combination of two or more reflectors for a single light source
- F21V7/0033—Combination of two or more reflectors for a single light source with successive reflections from one reflector to the next or following
- F21V7/0041—Combination of two or more reflectors for a single light source with successive reflections from one reflector to the next or following for avoiding direct view of the light source or to prevent dazzling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
The invention relates to the field of semiconductor light-emitting devices, and discloses a center light-splitting reflective optical unit. The unit comprises an LED light source (1) and a reflective optical unit, wherein the reflective optical unit comprises center light-splitting reflective curved surfaces (3) arranged on a light-emitting optical axis of the LED light source (1) and side reflective curved surfaces (4) arranged on the sides of the LED light source (1), and light transmission areas (2) are reserved between the center light-splitting reflective curved surfaces (3) and the side reflective curved surfaces (4). The invention also provides a center light-splitting reflective optical system and a method for manufacturing the center light-splitting reflective optical unit. The invention can greatly change the angular light distribution of the light source.
Description
Technical field
The present invention relates to the light emitting semiconductor device field, relate in particular to the preparation method of a kind of center light-splitting reflective optical unit and system and center light-splitting reflective optical unit.
Background technology
After incandescent lamp and the fluorescent lamp, it is little, efficient that the semiconductor lighting that is described as " revolution for the third time " of lighting field has a volume, dc low-voltage, and environmental protection, the life-span is long, the colour rendering advantages of higher, its market is huge, and development is rapidly.The luminous efficiency of present commercial large power white light LED has reached 80lm/W, will reach in 2010 or surpasses 100lm/W 30000 hours service life, will reach 150～200lm/W in 2015,100000 hours service life.Its development prospect is very clear and definite, promptly replaces conventional light source in the major applications field.
Adopting LED at present is the focus that LED uses as road-light light-source.Have the characteristics of concentration of energy according to the angle luminous intensity distribution of led light source own at optical axis direction, arrange by the geometry of certain rule and can make the lamp lighting range expansion, for example Chinese utility model patent 200520062069.3 described " LED street lamp " is installed in LED on the installed surface of projection, can enlarge the range of exposures of LED street lamp.Chinese invention patent 200610049888.3 described " high-power LED street lamp " places the heat dissipation base surface to great power LED, each LED lamp sleeve is connected to corresponding lens, and be installed between diffuser and the heat dissipation base, this method utilizes lens to realize the expansion of light intensity angle.But above two kinds of methods are limited to the effect of adjusting light fixture angle luminous intensity distribution, and formed hot spot still is a similar round, and the road illumination uniformity is low.
In order to obtain the highest utilization ratio, the illuminating effect that is applicable to road lighting should be the exiting surface direction of most of light directive of sending of light fixture away from lamp, concentration of energy be positioned at road effective lighting scope and illumination even, for general led light source, this need significantly adjust luminous intensity distribution.China's patent application patent 200710118965.0 described " a kind of lens that are used for led light source " utilize the big refringence between lens and air to cause the interface total reflection dexterously, light process total reflection that is mapped to the side and the required angle of refraction directive, but this design need consider simultaneously that light source luminous intensity distribution, material refractive index, refractive index are to aspects factors such as angle of total reflection influence and the angular deflections of bright dipping interface, design is complicated, and limited to light source bright dipping adjustable extent.China's patent application patent 200710044721.2 described " a kind of LED road lamp devices that form rectangular light spot " become directional light to the LED bright dipping by the offside reflection cup, and the lenticule that passes through exiting surface is controlled the light direction of light, but adopt reflector only can be reflected into directional light to a part of light that light source sends, simultaneously, lenticule also can not be implemented effective wide-angle expansion to the large tracts of land light source, is difficult to realize the wide-angle rectangular light spot.China's patent application patent 200710073278.1 described " LED street lamp and lens thereof " are corresponding one by one with each LED by make the 3 D stereo set of lenses on lampshade, realize the purpose of illumination rectangular light spot, but the lampshade outer surface structure complexity of this structure, gathering plaster easily influences light effect.
Summary of the invention
At the shortcoming of prior art, the purpose of this invention is to provide a kind of center light-splitting reflective optical unit of realizing adjusting significantly the light-source angle luminous intensity distribution.
In addition, the present invention also provides the preparation method of a kind of center light-splitting reflective optical system and center light-splitting reflective optical unit.
Described center light-splitting reflective optical texture is by led light source, transmission region, and center beam split reflecting curved surface and offside reflection curved surface four parts are formed.Relation between described four parts satisfies: center beam split reflecting curved surface is positioned on the led light source bright dipping optical axis, and the offside reflection curved surface is positioned at the led light source side, and the zone of leaving a blank between center beam split reflecting curved surface and the offside reflection curved surface forms transmission region.The part light that led light source sends is the specific direction of directive after center beam split reflecting curved surface or offside reflection curved surface are no less than primary event, and with all the other light in transmission region mixing outgoing.
Center of the present invention light-splitting reflective optical texture comprises led light source, transmission region, center beam split reflecting curved surface and offside reflection curved surface four parts.Relation between described four parts satisfies: center beam split reflecting curved surface is positioned on the led light source bright dipping optical axis, and the offside reflection curved surface is positioned at the led light source side, and the zone of leaving a blank between center beam split reflecting curved surface and the offside reflection curved surface forms transmission region.
Wherein, beam split reflecting curved surface in center is the curved surface to the LED projection.
The dipped beam direction of principal axis light that is sent by led light source is incident upon center beam split reflecting curved surface back reflection to the distance light direction of principal axis; The part light that is sent by led light source is not incident upon on any reflecting curved surface; The distance light direction of principal axis light that is sent by led light source is incident upon offside reflection curved surface back reflection to the dipped beam direction of principal axis; The special angle light process of being sent by led light source is no less than two secondary reflections; More than four kinds of light mix in the bright dipping zone and obtain new angle distribution curve flux.
The mentality of designing of center of the present invention beam splitting type optical texture and the design of other reflective optics have very big-difference, and it is key character of the present invention that the foveal reflex curved surface is set in the bright dipping light path, and this structure is specially adapted to the floodlight optical design.The offside reflection curved surface is paid close attention in the reflective optic design in past, by adjusting the axial light of distance light, makes emergent light concentrate on optical axis direction, and its typical application is confined to the flashlight reflector, optically focused occasions such as searchlight reflector.In the present invention, by innovation the foveal reflex curved surface is set in the bright dipping light path, nearly optical axis light reflexes to the distance light direction of principal axis, and by the offside reflection curved surface, to the reasonable luminous intensity distribution of light fixture dipped beam direction of principal axis, realize adjusting significantly the purpose of the distribution curve flux of light source, and the curve form by adjustment center beam split curved surface, offside reflection curved surface, thereby uniform reflective radiation response obtained.To the design of foveal reflex face and offside reflection curve form, its design process generally comprises the theoretical calculating of non-imaging curved surface, three steps of numerical simulation and object authentication.The theoretical calculating of the non-imaging curved surface of the first step is the type according to light source characteristics and needed optical effect feature selecting reflecting curved surface, and calculates the numerical value equation of curved surface profile; The simulation of the second step number value is to set up the optics physical model in computer, and by the mode simulated optical effect of Monte Carlo ray tracing, simulation softward commonly used comprises Tracepro, ASAP, LightTool etc.; The 3rd step object authentication is to go out designed optical element by rapid shaping or Mold Making, by the optical design test platform, and the optical effect that checking is actual, and compare with design and physical model is adjusted, obtain optimum project organization.
In order to illustrate that center light-splitting reflective optical texture has practical illumination design effect, we adopt Tracepro to set up optical model, and order is accepted identity distance from 10 meters of light sources, observe the hot spot accepted on the face and the uniformity of hot spot.When adopting the led light source direct irradiation, that accepts to see on the face is one only center illumination is strong, but the dark round spot of peripheral illumination, the hot spot uniformity is low; And behind the light-splitting reflective optical texture of the center of employing, obtain a large-area strip speck, hot spot uniformity height on the receiving plane.
Center light-splitting reflective optical design proposed by the invention can change the led light source distribution curve flux significantly, general offside reflection formula optical design and the optical design of non-spherical lens formula have obvious advantage: center beam splitting type structure can be adjusted the paraxial to emergent light of light source, can obtain floodlight formula large tracts of land evenly throws light on, and offside reflection formula structure is only adjusted the axially emergent light far away of light source, only can obtain spotlight effect; Adopt non-spherical lens also can realize adjusting distribution curve flux significantly, but non-spherical lens design and making are more than the reflective structure complexity.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention 1;
Fig. 2 be the embodiment of the invention 1 optical path analysis figure;
Fig. 3 is the structural representation of the embodiment of the invention 2;
Fig. 4 a, 4b are respectively side-looking longitdinal cross-section diagram and the view in transverse section of Fig. 3;
Fig. 5 is the structural representation of the embodiment of the invention 6;
Fig. 6 is the structure chart of reflecting surface carrier with the transparency for the present invention's making;
Fig. 7 is the structure chart of the center light-splitting reflective optical unit of the embodiment of the invention 7;
Fig. 8 is the structural representation of the center light-splitting reflective optical system of employing embodiment 7 compositions;
Fig. 9 is existing desk lamp optical texture;
Figure 10 is for using the desk lamp optical texture that the present invention realizes.
The specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
A kind of center disclosed in this invention light-splitting reflective optical unit, as shown in Figure 1, comprise led light source 1 and reflective optical unit, this reflective optical unit comprises the offside reflection curved surface 4 of being located at the center beam split reflecting curved surface 3 on the led light source 1 bright dipping optical axis 5 and being located at led light source 1 side, and leaves transmission region 2 between center beam split reflecting curved surface 3 and the offside reflection curved surface 4.As shown in Figure 2, the dipped beam direction of principal axis light 11 that is sent by led light source 1 is incident upon center beam split reflecting curved surface 3 back reflections to the distance light direction of principal axis; The part light 12 that is sent by led light source 1 can not be incident upon on any reflecting curved surface; The distance light direction of principal axis light 13 that is sent by led light source 1 is incident upon offside reflection curved surface 4 back reflections to the dipped beam direction of principal axis; Special angle light 14 processes of being sent by led light source 1 are no less than two secondary reflections; More than four kinds of light mix in bright dipping zone 2 and obtain new angle distribution curve flux.
This center beam split reflecting curved surface 3 is the curved surface to led light source 1 projection, and offside reflection curved surface 4 is certain inclination angle with the bright dipping optical axis and along the bright dipping optical axis toward outer incline.
Any for in the lower surface camber of light reflection surface 21 divided at this center: plane, sphere, ellipsoid, hyperboloid, parabola, the conical surface, cylinder, surface equation are at secondary or the high order curved surface more than the secondary, or any or two or more faces is spliced in the above curved surface.
This offside reflection curved surface 4 is any with in the lower surface camber: plane, sphere, ellipsoid, hyperboloid, parabola, the conical surface, cylinder, surface equation are at secondary or the high order curved surface more than the secondary, or any or two or more faces is spliced in the above curved surface.
Present embodiment discloses wherein a kind of center light-splitting reflective optical unit, and Fig. 3 is the graphics of this optical texture, mainly comprises led light source 1 and reflective optical unit 20 two parts, and Fig. 4 a and 4b are the side direction two dimension views after this optical texture assembling.It is two inclined-planes of a class triangular prism 21 that light reflection surface is divided at the center, the bowl-type reflecting surface 22 of offside reflection face for surrounding by four curved surfaces, the center divides light reflection surface and offside reflection face to be produced on erose reflector 20 surfaces, forms a cavity that mates with led light source lamp holder 10 profiles in this reflector.
The structure of present embodiment is similar to embodiment 1, and it further fills this transmission region 2 with layer of transparent material 42 on embodiment 1.This center beam split reflecting curved surface 3 and offside reflection curved surface 4 are for adopting the formed interface with reflecting effect of method of plating, vacuum evaporation, sputter, reflection sheet stickup or surface finish on transparency material 42.
Present embodiment provides a kind of center light-splitting reflective optical system, it comprises that a function is dull and stereotyped and is located on the function flat board and realizes a plurality of led light sources that are electrically connected and be positioned at reflective optic module on the function flat board, this reflective optic module is spliced to form by a plurality of embodiment 1 described reflective optical units, and each reflective optical unit is corresponding one by one with each led light source.Realize that thus the LED high-power modular is integrated.
As shown in Figure 5, present embodiment provides another center light-splitting reflective optical system, it comprises a function dull and stereotyped 32 and is located on the function flat board 32 and realizes a plurality of led light sources 31 that are electrically connected and be positioned at reflective optic module 30 on the function flat board 32, this reflective optic module 30 comprises that the embodiment spaced apart 1 described reflective optical unit 33 and second reflective optical unit 34 are spliced to form, and this second reflective optical unit 34 is made of the offside reflection curved surface of being located at led light source 31 sides.The light that led light source sends respectively through the mixed light that obtains behind two kinds of reflector elements can obtain with use separately wherein a kind of reflector element different effect.
Embodiment 6
Present embodiment provides a kind of preparation method of embodiment 3 described center light-splitting reflective optical units, and as shown in Figure 6, it may further comprise the steps:
(1) the last following table with the transparent substance of stage body shape respectively cuts out a cavity 54,51;
(2) led light source is located in the cavity 51 of following table;
(3) form reflecting surface to form center beam split reflecting curved surface on cavity 54 surfaces of upper table surface;
(4) side forms another reflecting surface to form the offside reflection curved surface around stage body.
The generation type of reflecting surface can adopt the method for plating, vacuum evaporation, sputter, reflection sheet stickup or surface finish, and this transparency material is made up of macromolecule transparent polymer or glass material.
Embodiment 7
Present embodiment discloses the preparation method of another kind of employing center of the present invention light-splitting reflective optical unit.As shown in Figure 7, led light source 41 is fixed on the package support 40 with concave inward structure among the figure, and the indent inclined-plane 43 of package support is made into offside reflection face, embedding layer of transparent material 42 in the led chip surface-coated fluorescent material or do not apply fluorescent material, indent cup bowl.Make a material in the transparency and form the dissimilar materials zone that is different from this transparency, and at the surface in this dissimilar materials zone 44 making center beam split reflecting interfaces, this reflecting interface can be in the following manner any one realization: place a reflector, place the object of a refractive index much smaller than transparency 42, left a blank in this zone, left a blank in this zone and in this region surface evaporation reflecting layer.Described surperficial 44 and 43 on support indent inclined-plane form transmission region.Therefore, light reflection surface and side-emitted face are divided in center of wanting required for the present invention, the bright dipping zone, and light source is all complete, can realize the function that the present invention will reach.Fig. 8 is the multichip LED encapsulation structure that is designed to the unit with above.
Embodiment 8
As shown in Figure 9, the desk lamp optical texture that a kind of employing the present invention of following discloses " a kind of center light-splitting reflective optical texture that is used for led light source " realizes.Similar embodiment 1, can under desk lamp, obtain large-area uniform illuminating effect by center light-splitting reflective optical texture, but here, light-splitting reflective optical texture in center also has a more important role---solve the problem of serious ghost image under the LED desk lamp shelter.The LED desk lamp generally adopts plurality of LEDs 61 integrated lightings, shade 62 is arranged under light source, the light that each LEDs sends forms the shadow region respectively under shade, because the led light source light-emitting area is tiny, make the border, shadow region very sharp keen, when the stack of a plurality of shadow regions, just form tangible ghost image 63 at desktop 60, and this effect causes visual fatigue easily.The method that solves is to make the light source area increase, and generally adopt the method for adding light diffusion layer between light source and workspace at present, but this measure causes the LED amount of light seriously to reduce.Employing center light-splitting reflective optical texture can effectively solve the problem of ghost image.Method for designing of the present invention be utilize center beam split reflecting curved surface 64 make light that LED sends can not direct irradiation in the working region, cooperate with the offside reflection curved surface by center beam split reflecting curved surface again, make led light source behind reflecting surface, form the virtual image 65 of amplifying, thereby make efficient lighting area increase, obtain the shade transition 66 of gradual change then.
Claims (10)
1, a kind of center light-splitting reflective optical unit is characterized in that: described optical texture has the center in the bright dipping light path of led light source and divides light reflection surface, and center beam split reflecting curved surface is positioned on the led light source bright dipping optical axis.
2, center according to claim 1 light-splitting reflective optical unit, it is characterized in that: the side of this led light source (1) bright dipping light path two is provided with offside reflection curved surface (4), and leaves transmission region (2) between center beam split reflecting curved surface (3) and the offside reflection curved surface (4).
3, center according to claim 1 light-splitting reflective optical unit, it is characterized in that: this center beam split reflecting curved surface (3) is the curved surface to led light source (1) projection, and offside reflection curved surface (4) is certain inclination angle with the bright dipping optical axis and along the bright dipping optical axis toward outer incline.
4, center according to claim 3 light-splitting reflective optical unit, it is characterized in that: this transmission region (2) is filled with layer of transparent material (42).
5, center according to claim 2 light-splitting reflective optical unit is characterized in that: this center beam split reflecting curved surface (3) and offside reflection curved surface (4) adopt plating, vacuum evaporation, sputter, reflection sheet to paste or the formed interface with reflecting effect of method of surface finish for going up at transparency material (42).
6, center according to claim 2 light-splitting reflective optical unit, it is characterized in that: light reflection surface (21) any for in the lower surface camber divided at this center: plane, sphere, ellipsoid, hyperboloid, parabola, the conical surface, cylinder, surface equation are at secondary or the high order curved surface more than the secondary, or any or two or more faces is spliced in the above curved surface.
7, center according to claim 2 light-splitting reflective optical unit, it is characterized in that: this offside reflection curved surface (4) any for in the lower surface camber: plane, sphere, ellipsoid, hyperboloid, parabola, the conical surface, cylinder, surface equation are at secondary or the high order curved surface more than the secondary, or any or two or more faces is spliced in the above curved surface.
8, a kind of center light-splitting reflective optical system, it comprises that a function is dull and stereotyped and is located on the function flat board and realizes a plurality of led light sources that are electrically connected and be positioned at reflective optic module on the function flat board, it is characterized in that: this reflective optic module is spliced to form by the described reflective optical unit of a plurality of claims 1, and each reflective optical unit is corresponding one by one with each led light source.
9, a kind of center light-splitting reflective optical system, it comprises that a function is dull and stereotyped and is located on the function flat board and realizes a plurality of led light sources that are electrically connected and be positioned at reflective optic module (30) on the function flat board, it is characterized in that: this reflective optic module (30) comprises that described reflective optical unit of claim 1 spaced apart and second reflective optical unit (34) are spliced to form, and this second reflective optical unit is made of the offside reflection curved surface of being located at the led light source side.
10, the preparation method of the described center of a kind of claim 5 light-splitting reflective optical unit is characterized in that may further comprise the steps:
(1) the last following table with the transparent substance of stage body shape respectively cuts out a cavity (54,51);
(2) led light source is located in the cavity (51) of following table;
(3) form reflecting surface to form center beam split reflecting curved surface on cavity (54) surface of upper table surface;
(4) side forms another reflecting surface to form the offside reflection curved surface around stage body.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2009100377153A CN101576231A (en) | 2009-03-10 | 2009-03-10 | Center light-splitting reflective optical unit and system, and manufacturing method thereof |
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| CNA2009100377153A CN101576231A (en) | 2009-03-10 | 2009-03-10 | Center light-splitting reflective optical unit and system, and manufacturing method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102720966A (en) * | 2012-06-05 | 2012-10-10 | 深圳市中孚能电气设备有限公司 | Lamp head |
| CN102748710A (en) * | 2011-04-21 | 2012-10-24 | 海洋王照明科技股份有限公司 | Floodlight total-reflection lens and LED (Light Emitting Diode) lamp using lens |
| CN102748707A (en) * | 2011-04-21 | 2012-10-24 | 海洋王照明科技股份有限公司 | Floodlight total-reflection lens and LED (Light Emitting Diode) lamp using lens |
| CN102748711A (en) * | 2011-04-21 | 2012-10-24 | 海洋王照明科技股份有限公司 | Full-reflection lens and LED (Light-Emitting Diode) lamp using same |
| JP2013105604A (en) * | 2011-11-11 | 2013-05-30 | Idec Corp | Reflector for led lighting device and led lighting device |
| WO2013082859A1 (en) * | 2011-12-05 | 2013-06-13 | 东莞泰德照明科技有限公司 | Led lighting and light distribution system |
| CN105020609A (en) * | 2015-08-04 | 2015-11-04 | 横店集团得邦照明股份有限公司 | Novel structure LED all-direction bulb lamp and achieving method thereof |
| CN105929469A (en) * | 2016-06-30 | 2016-09-07 | 成都恒坤光电科技有限公司 | Lens, lighting device and high-beam illumination optical system for motor vehicle |
-
2009
- 2009-03-10 CN CNA2009100377153A patent/CN101576231A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102748710A (en) * | 2011-04-21 | 2012-10-24 | 海洋王照明科技股份有限公司 | Floodlight total-reflection lens and LED (Light Emitting Diode) lamp using lens |
| CN102748707A (en) * | 2011-04-21 | 2012-10-24 | 海洋王照明科技股份有限公司 | Floodlight total-reflection lens and LED (Light Emitting Diode) lamp using lens |
| CN102748711A (en) * | 2011-04-21 | 2012-10-24 | 海洋王照明科技股份有限公司 | Full-reflection lens and LED (Light-Emitting Diode) lamp using same |
| CN102748711B (en) * | 2011-04-21 | 2014-03-12 | 海洋王照明科技股份有限公司 | Full-reflection lens and LED (Light-Emitting Diode) lamp using same |
| CN102748710B (en) * | 2011-04-21 | 2014-03-12 | 海洋王照明科技股份有限公司 | Floodlight total-reflection lens and LED (Light Emitting Diode) lamp using lens |
| CN102748707B (en) * | 2011-04-21 | 2014-05-14 | 海洋王照明科技股份有限公司 | Floodlight total-reflection lens and LED (Light Emitting Diode) lamp using lens |
| JP2013105604A (en) * | 2011-11-11 | 2013-05-30 | Idec Corp | Reflector for led lighting device and led lighting device |
| WO2013082859A1 (en) * | 2011-12-05 | 2013-06-13 | 东莞泰德照明科技有限公司 | Led lighting and light distribution system |
| CN102720966A (en) * | 2012-06-05 | 2012-10-10 | 深圳市中孚能电气设备有限公司 | Lamp head |
| CN102720966B (en) * | 2012-06-05 | 2016-06-29 | 深圳市中孚能电气设备有限公司 | A kind of lamp holder |
| CN105020609A (en) * | 2015-08-04 | 2015-11-04 | 横店集团得邦照明股份有限公司 | Novel structure LED all-direction bulb lamp and achieving method thereof |
| CN105929469A (en) * | 2016-06-30 | 2016-09-07 | 成都恒坤光电科技有限公司 | Lens, lighting device and high-beam illumination optical system for motor vehicle |
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Open date: 20091111 |