CN205451061U - Integrated optical lens of free -form surface for LED motorcycle headlamp - Google Patents

Integrated optical lens of free -form surface for LED motorcycle headlamp Download PDF

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Publication number
CN205451061U
CN205451061U CN201521002798.XU CN201521002798U CN205451061U CN 205451061 U CN205451061 U CN 205451061U CN 201521002798 U CN201521002798 U CN 201521002798U CN 205451061 U CN205451061 U CN 205451061U
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China
Prior art keywords
plane
optical lens
face
form surface
light
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Expired - Fee Related
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CN201521002798.XU
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Chinese (zh)
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王洪
王翔
葛鹏
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Zhongshan Institute of Modern Industrial Technology of South China University of Technology
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Zhongshan Institute of Modern Industrial Technology of South China University of Technology
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/82—Elements for improving aerodynamics

Abstract

The utility model discloses an integrated optical lens of free -form surface for LED motorcycle headlamp, lens include samely optical lens for the far -reaching headlamp in the head -light and for passing lamp optical lens, for the far -reaching headlamp optical lens and for the passing lamp optical lens constitute by incident surface (the protruding profile and the face of cylinder), side (side plane of reflection) and emitting face (spill free -form surface ). The utility model provides a technical scheme is applicable to the new national standard of motorcycle headlamp who uses the LED light source, has overcome the problem that will face more complicated optical design when motorcycle headlamp is applied to to current LED light source, has solved current motorcycle lens head -light to have the colour temperature is on the high side or optics efficiency is not high defect, simple and convenient reliable, ripe feasible.

Description

LED motorcycle headlamp free form surface integrated optics lens
Technical field
This utility model relates to LED motorcycle lamp lighting technical field, particularly to LED motorcycle headlamp free form surface integrated optics lens.
Background technology
Along with development and the car load configuration needs of science and technology, in vehicle light illumination industry, GB5948-1998 " motorcycle white heat mercerising source headlamp luminous intensity distribution performance " is required that the cry revised is strong.Deciding through discussion through expert group, mandatory national standards will be formulated, title is fixed tentatively as " launching symmetrical dipped beam and/or the automotive headlight luminous intensity distribution performance of distance light ", after standard approval is issued, will the enforcement transition period be set, and progressively substitutes existing motorcycle headlamp standard GB5948-1998 " motorcycle white heat mercerising source headlamp luminous intensity distribution performance ".
Light type and illumination requirement in motorcycle headlamp new nation standard are different from GB5948-1998, will issuing of new nation's standard means will be eliminated according to the motorcycle headlamp of GB5948-1998 design, and its optical design used also is no longer desirable for new national standard.Particularly with the motorcycle headlamp using LED light source, owing to the luminous model of LED chip is approximately cosine radiator, optical characteristics is different from the incandescent mercerising source of conventional motorcycle, makes LED light source face more complicated optical design issues when being applied to motorcycle headlamp.And there is the problem that colour temperature is higher or optical efficiency is the highest in existing motorcycle lens headlamp.
Utility model content
This utility model is for the problem of above-mentioned existence, provide the LED headlamp of motorcycle, this LED motorcycle headlamp includes high beam and dipped headlights, can meet the new national standard light distribution requirements to motor Vehicular LED headlamp, solves the optical design issues using LED light source.
This utility model adopts the following technical scheme that.
LED motorcycle headlamp free form surface integrated optics lens, described free form surface integrated optics lens collection includes that high beam optical lens and the dipped headlights optical lens being positioned in same headlamp, described high beam optical lens and the most each free plane of incidence of dipped headlights optical lens, lateral reflection face and exit facet are constituted；The described plane of incidence is made up of with the face of cylinder convex face；Described exit facet is spill free form surface, and the face towards illuminated area side i.e. exit facet is referred to as the top for optical lens；
The shape of the spill free form surface of described high beam optical lens is defined below:
The base plane of optical lens is be arranged in parallel with LED chip light-emitting area, with the central point of LED chip light-emitting area for zero O1Setting up rectangular coordinate system, LED chip light-emitting area place plane is X1O1Y1Plane, crosses initial point O1And and X1O1Y1The vertical axle of plane is Z1Axle, wherein X1O1Y1Plane is horizontal plane, at zero O1At front distance 25 meters and Z1Axle intersection point is o1And it is parallel to X1O1Y1The plane of plane is set to illuminated area, puts o1For illuminated area center, the illumination region on illuminated area is set as with illuminated area central point o1Centered by elliptical region, this elliptical region is carried out the division of many annulus, then each annulus is carried out stress and strain model, law of conservation of energy is used to set up annulus energy correspondence solid angle energy relationship, then light source solid angle is correspondingly carried out and the division of grid equal amount by lighting requirement, LED chip is luminous is parallel rays after the described plane of incidence and lateral reflection face convert, incident angle at curved surface is converted into away from central point distance, initial point is first set when obtaining either segment free curve afterwards, then the law of refraction reversely corresponding irradiation area is used to draw this curve by iterative numerical, then by these free curves drawn around Z1Axle rotating 360 degrees composition spill free form surface shape；
The shape of the spill free form surface of described dipped headlights optical lens is defined below:
The base plane of optical lens being vertically arranged with LED chip light-emitting area, the reflective optical system of dipped headlights uses the reflective optical system of part-ellipsoids shape, with the outside focus of reflective optical system for zero O2Set up rectangular coordinate system, to cross some O2And the parallel plane of the base plane that is parallel to optical lens is X2O2Y2Plane, crosses initial point O2And and X2O2Y2The vertical axle of plane is Z2Axle, wherein X2O2Y2Plane is horizontal plane, at zero O2At front distance 25 meters and Z2Axle intersection point is o2And it is parallel to X2O2Y2The plane of plane is set to illuminated area, puts o2For the central point of illuminated area, illumination region is set to the central point o with illuminated area2Semicircular area for the center of circle, this semicircular area is carried out the division of many annulus, law of conservation of energy is used to set up annulus energy correspondence solid angle energy relationship, then light source solid angle is carried out by lighting requirement many parts of divisions of equal amount, the light of reflective optical system reflection is converted into parallel rays through the plane of incidence and lateral reflection face, incident angle is converted into away from central point distance, initial point is first set when obtaining either segment free curve, then the law of refraction reversely corresponding irradiation area is used to draw this curve, then by the free curve drawn around Z by iterative numerical2Axle rotating 360 degrees composition dipped headlights optical lens free form surface shape.
Further, described this elliptical region is carried out many annulus divide specifically include: be divided into n part by the major semiaxis a of elliptic region, then semi-minor axis b be divided into n part by the same ratio that major semiaxis divides, with aj, bjRepresenting jth part of major axis a after dividing, j=1～n, then with illuminated area central point o1Centered by, respectively with a1+a2+...+aj-1,b1+b2+...+bj-1Ellipse is done, then with a for major and minor axis1+a2+...+aj,b1+b2+...+bjMaking ellipse for major and minor axis, two elliptical center regions are this ring belt area.
Further, described this semicircular area is carried out many annulus divide specifically include: first the radius of circle r of semicircular area is divided into n part, with rjJth part of radius after expression decile, j=1～n, then with illuminated area central point o2For the center of circle, respectively with r1+r+...+rj-1And r1+r+...+rjDraw circle for radius, this semicircular area is divided into semicircular rings region.
Further, in the shape of the spill free form surface of described high beam optical lens determines, described utilization law of conservation of energy sets up annulus energy correspondence solid angle energy relationship, then the many parts of divisions that light source solid angle carries out equal amount by lighting requirement is specifically included: emergent ray L1With Z1The angle Φ of axle positive direction is divided into n part, has ΦjRepresent jth part of Φ, Φj-a divided with described annulusjWith-bjOne_to_one corresponding, Φj-1With ΦjThe luminous flux of angle is equal to-aj-1、-bj-1With-aj、-bjRepresent the energy of annulus, emergent ray L1At X1O1Y1Projection in plane and X1The angle theta of axle is divided into m part, uses θjRepresent jth part of θ, θj-α with described stress and strain modeljOne_to_one corresponding, by ΦjAnd θjBring luminous flux formula into, then by luminous flux in each angle equal to the energy in each small grid region, calculate the Φ of correspondencejAnd θjNumerical value.
Further, in the shape of the spill free form surface of described dipped headlights optical lens determines, described utilization law of conservation of energy sets up annulus energy correspondence solid angle energy relationship, then the many parts of divisions that light source solid angle carries out equal amount by lighting requirement is specifically included: emergent ray L2With Z2The angle Φ ' of axle positive direction is divided into n part, with Φ 'jRepresent jth part of Φ ', Φ 'j-the r divided with described annulusjOne_to_one corresponding, Φj-1With ΦjThe luminous flux of angle is equal to rj-1With rjRepresent the energy of annulus. by Φ 'jBring luminous flux formula into, then by luminous flux in each angle equal to the energy in described every a circular band region, calculate the Φ ' of correspondencejNumerical value.
Further, described convex face is the convex curved surface with LED as focus, is collimated by light parallel, convex face width degree L by light angle β collected, 60 ° >=β >=30 °.
Further, the radius on the described face of cylinder equal to the width L in convex face, the face of cylinder by deflection of light to lateral reflection face.
Further, described lateral reflection face incident ray is the light through face of cylinder deviation, and reflection light is parallel rays, according to the law of refraction, then draws lateral reflection surface curve by iterative numerical.
Compared with prior art, this utility model has the advantage that and technique effect:
Technical scheme provided by the utility model is suitable for use with the motorcycle headlamp new nation standard of LED light source, overcomes the problem of more complicated optical design that to face when current LED light source is applied to motorcycle headlamp, solves existing motorcycle lens headlamp and there is colour temperature is higher or optical efficiency is the highest defect, easy reliable, mature and feasible.
Accompanying drawing explanation
Fig. 1 is the high beam optical lens schematic front view of this utility model embodiment.
Fig. 2 be in Fig. 1 A-A to cross-sectional schematic.
Fig. 3 is the dipped headlights optical lens schematic front view of this utility model embodiment.
Fig. 4 be in Fig. 3 B-B to cross-sectional schematic.
Fig. 5 be this utility model embodiment high beam and illuminated area between the schematic diagram of relation.
Fig. 6 be this utility model embodiment dipped headlights and illuminated area between the schematic diagram of relation.
Fig. 7 is the schematic diagram of the high beam emergent ray relation of this utility model embodiment.
Fig. 8 is the schematic diagram of the dipped headlights emergent ray relation of this utility model embodiment.
In figure: 1-high beam optical lens；11-1 high beam optics lens entrance convex face；The 11-2 high beam optics lens entrance face of cylinder；12-high beam optical lens spill free form surface；13-high beam LED chip；14-high beam illuminated area；15-elliptical region；2-dipped headlights optical lens；21-1 dipped headlights optics lens entrance convex face；22-dipped headlights optical lens spill free form surface；23-reflective optical system；24-dipped headlights LED chip；25-dipped headlights illuminated area；26-semicircular area.
Detailed description of the invention
With embodiment, this utility model is described in further detail below in conjunction with the accompanying drawings, it should be noted that accompanying drawing being merely cited for property explanation, it is impossible to it is interpreted as the restriction to this patent；To those skilled in the art, in accompanying drawing, some known features and explanation thereof may will be understood by omission.
As shown in Figures 1 to 4, optical lens with free curved surface for LED motorcycle headlamp, including the high beam optical lens 1 in described same headlamp and dipped headlights optical lens 2, described high beam optical lens 1, dipped headlights optical lens 2 is class convexoconcave lens, face (the 11-1 of described high beam optical lens 1, 11-2) with the dipped headlights face (21-1 of optical lens 2, 21-2) it is light entrance face, both spill free form surfaces (12, 22) it is light-emitting face, high beam optical lens 1 and dipped headlights optical lens 2 are respectively at LED chip (13, 24) before.
For high beam optical lens spill free form surface 12, specifically:
The plane of optical lens is be arranged in parallel with LED chip light-emitting area, with the central point of LED chip light-emitting area for zero O1Setting up rectangular coordinate system, LED chip light-emitting area place plane is X1O1Y1Plane, crosses initial point O1And and X1O1Y1The vertical axle of plane is Z1Axle, wherein X1O1Y1Plane is horizontal plane, at zero O1At front distance 25 meters and Z1Axle intersection point is o1And it is parallel to X1O1Y1The plane of plane is set to illuminated area, puts o1For illuminated area center, the illumination region on illuminated area is set as with illuminated area central point o1Centered by elliptical region, then this elliptical region is carried out the division of many annulus, then each annulus is carried out stress and strain model, law of conservation of energy is used to set up annulus energy correspondence solid angle energy relationship, then light source solid angle is carried out by lighting requirement many parts of divisions of equal amount, it is converted into parallel rays through the plane of incidence and lateral reflection face, incident angle is converted into away from central point distance, initial point is first set when obtaining either segment free curve afterwards, then the law of refraction reversely corresponding irradiation area is used to draw this curve by iterative numerical, then by these free curves 12 drawn around Z1The spill free form surface 12 of axle rotating 360 degrees composition high beam optical lens；See and see Fig. 5 and Fig. 7.
The shape of the spill free form surface 22 of described dipped headlights optical lens 2 is defined below: the plane 21 that dipped headlights is used up lens 2 is vertically arranged with LED chip 24 light-emitting area, reflective optical system 23 uses the reflective optical system of part-ellipsoids shape, with the outside focus of reflective optical system 23 for zero O2Set up rectangular coordinate system, to cross some O2And the parallel plane of the plane 21 that is parallel to dipped headlights optical lens 2 is X2O2Y2Plane, crosses initial point O2And and X2O2Y2The vertical axle of plane is Z2Axle, wherein X2O2Y2Plane is horizontal plane, at zero O2At front distance 25 meters and Z2Axle intersection point is o2And it is parallel to X2O2Y2The plane of plane is set to illuminated area 25, puts o2For the central point of illuminated area 25, illumination region is set to the central point o with illuminated area 252Semicircular area 26 for the center of circle, this semicircular area 26 is carried out the division of many annulus, law of conservation of energy is used to set up annulus energy correspondence solid angle energy relationship, then light source solid angle is carried out by lighting requirement many parts of divisions of equal amount, it is converted into parallel rays through the plane of incidence and lateral reflection face, incident angle is converted into away from central point distance, initial point is first set when obtaining either segment free curve, then the law of refraction reversely corresponding irradiation area is used to draw this curve, then by the free curve drawn around Z by iterative numerical2Axle rotating 360 degrees composition dipped headlights optical lens spill free form surface 22.See Fig. 6 and Fig. 8.
Specifically, for the high beam spill free form surface 12 of optical lens 1:
Described this elliptical region 15 is carried out annulus divide specifically include: be divided into n part by the major semiaxis a of elliptic region, then semi-minor axis b be divided into n part by the same ratio that major semiaxis divides, with aj, bjRepresent jth part of major axis a after dividing, then with illuminated area central point o1Centered by, respectively with a1+a2+...+aj-1,b1+b2+...+bj-1Ellipse is done, then with a for major and minor axis1+a2+...+aj,b1+b2+...+bjMaking ellipse for major and minor axis, two elliptical center regions are this ring belt area.
Described each ring belt area is carried out stress and strain model specifically include: first the major semiaxis a and semi-minor axis b of a certain ring belt area are divided into n part, respectively with a1And biRepresent i-th part of major semiaxis a after decile and i-th part of semi-minor axis, with illuminated area central point o1Centered by, ring belt area is drawn and is divided into m part vesica piscis region, then by any point on annulus and some o1The angle α of line and x-axis be divided into m part, with αjJth part of α after expression decile, with an o1For end points, it is α with the angle of x-axisjBeam every a vesica piscis region is sub-divided into m part, so ring belt area is divided from mxn sub-box.
Described utilization law of conservation of energy sets up annulus energy back correspondence solid angle energy relationship, then the many parts of divisions that light source solid angle carries out equal amount by lighting requirement is specifically included: emergent ray L1With Z1The angle Φ (Φ may be configured as 0 °≤Φ≤60 °) of axle positive direction is divided into n part, has ΦjRepresent jth part of Φ, Φj-a divided with described annulusjWith-bjOne_to_one corresponding, Φj-1With ΦjThe luminous flux of angle is equal to-aj-1、-bj-1With-aj、-bjRepresent the energy of annulus.Emergent ray L1At X1O1Y1Projection in plane and X1The angle theta (θ may be configured as 0 °≤θ≤360 °) of axle is divided into m part, uses θjRepresent jth part of θ, θj-α with described stress and strain modeljOne_to_one corresponding, by ΦjAnd θjBring luminous flux formula into, then by luminous flux in each angle equal to the energy in each small grid region, calculate the Φ of correspondencejAnd θjNumerical value.
Initial point is first set during described acquisition either segment free curve, then use the law of refraction to draw this curve by iterative numerical, then formed FREEFORM SURFACE MODEL by these free curves drawn and specifically include: set the most respectively each line segment initial point angle Φ as 0 ', Φ1、Φ2...ΦnSet high beam distance between plane and LED chip 13 light-emitting area of optical lens 1 the most respectively, i.e. determine the position of light entrance face, then suitable lens thickness h=8mm is chosen further according to this distance, determine the initial distance of the distance bottom surface that this value is every section of curve, just can carry out acquisition respectively according to iteration and obtain curve 12.
Specifically, for the dipped headlights spill free form surface 22 of optical lens 2:
Described utilization law of conservation of energy sets up annulus energy correspondence solid angle energy relationship, then the many parts of divisions that light source solid angle carries out equal amount by lighting requirement is specifically included: be emergent ray L2With Z2The angle Φ ' (Φ ' may be configured as 0 °≤Φ '≤60 °) of axle positive direction is divided into n part, with Φ 'jRepresent jth part of Φ ', Φ 'j-the r divided with described annulusjOne_to_one corresponding, Φj-1With ΦjThe luminous flux of angle is equal to-rj-1With-rjRepresent the energy of annulus. by Φ 'jBring luminous flux formula into, then by luminous flux in each angle equal to the energy in described every a circular band region, calculate the Φ ' of correspondencejNumerical value.
Initial point is first set during described acquisition either segment free curve, then use the law of refraction to draw this curve by iterative numerical, then formed FREEFORM SURFACE MODEL by these free curves drawn and specifically include: be set the most respectively each line segment initial point angle Φ as 0 ', Φ '1、Φ′2...Φ′nThen dipped headlights distance between plane 21 and LED chip 24 light-emitting area of optical lens 2 is set, i.e. determine the position of light entrance face, then suitable lens thickness h=8mm is chosen further according to this distance, determine the initial distance of the distance bottom surface that this value is every section of curve, just can carry out acquisition respectively according to iteration and obtain curve 22.
Obviously, the effect in described convex face be light is collimated parallel, convex face width degree L by light angle β collected, 60 ° >=β >=30 °.The radius on the described face of cylinder equal to the width L in convex face, the face of cylinder by deflection of light to lateral reflection face.And described lateral reflection face incident ray is the light through described face of cylinder deviation, reflection light is parallel rays, according to the law of refraction, then draws lateral reflection surface curve, at this without reinflated explanation by iterative numerical.
Above-described embodiment of the present utility model is only for clearly demonstrating this utility model example, and is not the restriction to embodiment of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here without also cannot all of embodiment be given exhaustive.All any amendment, equivalent and improvement etc. made within spirit of the present utility model and principle, within should be included in this utility model scope of the claims.

Claims (5)

1.LED motorcycle headlamp free form surface integrated optics lens, it is characterized in that: described free form surface integrated optics lens include that high beam optical lens and the dipped headlights optical lens being positioned in same headlamp, described high beam optical lens and the most each free plane of incidence of dipped headlights optical lens, lateral reflection face and exit facet are constituted；The described plane of incidence is made up of with the face of cylinder convex face；Described exit facet is spill free form surface.
LED motorcycle headlamp free form surface integrated optics lens the most according to claim 1, it is characterised in that the shape of the spill free form surface of described high beam optical lens is defined below:
Face towards illuminated area side i.e. exit facet is called the top of optical lens；The base plane of optical lens is be arranged in parallel with LED chip light-emitting area, with the central point of LED chip light-emitting area for zero O1Setting up rectangular coordinate system, LED chip light-emitting area place plane is X1O1Y1Plane, crosses initial point O1And and X1O1Y1The vertical axle of plane is Z1Axle, wherein X1O1Y1Plane is horizontal plane, at zero O1At front distance 25 meters and Z1Axle intersection point is o1And it is parallel to X1O1Y1The plane of plane is set to illuminated area, puts o1For illuminated area center, the illumination region on illuminated area is set as with illuminated area central point o1Centered by elliptical region, this elliptical region is carried out the division of many annulus, then each annulus is carried out stress and strain model, law of conservation of energy is used to set up annulus energy correspondence solid angle energy relationship, then light source solid angle is correspondingly carried out and the division of grid equal amount by lighting requirement, LED chip is luminous is parallel rays after the described plane of incidence and lateral reflection face convert, incident angle at curved surface is converted into away from central point distance, initial point is first set when determining either segment free curve afterwards, then the law of refraction reversely corresponding irradiation area is used to limit this curve shape by iteration, then by these free curves drawn around Z1Axle rotating 360 degrees composition spill free form surface shape；
The shape of the spill free form surface of described dipped headlights optical lens is defined below:
The base plane of optical lens being vertically arranged with LED chip light-emitting area, the reflective optical system of dipped headlights uses the reflective optical system of part-ellipsoids shape, with the outside focus of reflective optical system for zero O2Set up rectangular coordinate system, to cross some O2And the parallel plane of the base plane that is parallel to optical lens is X2O2Y2Plane, crosses initial point O2And and X2O2Y2The vertical axle of plane is Z2Axle, wherein X2O2Y2Plane is horizontal plane, at zero O2At front distance 25 meters and Z2Axle intersection point is o2And it is parallel to X2O2Y2The plane of plane is set to illuminated area, puts o2For the central point of illuminated area, illumination region is set to the central point o with illuminated area2Semicircular area for the center of circle, this semicircular area is carried out the division of many annulus, law of conservation of energy is used to set up annulus energy correspondence solid angle energy relationship, then light source solid angle is carried out by lighting requirement many parts of divisions of equal amount, the light of reflective optical system reflection is converted into parallel rays through the plane of incidence and lateral reflection face, incident angle is converted into away from central point distance, initial point is first set when obtaining either segment free curve, then the law of refraction reversely corresponding irradiation area is used to limit curve shape by iteration, then by the free curve drawn around Z2Axle rotating 360 degrees composition dipped headlights optical lens free form surface shape.
3. LED motorcycle headlamp free form surface integrated optics lens as claimed in claim 1, it is characterized in that: described convex face is the convex curved surface with LED as focus, light is collimated parallel, convex face width degree L by light angle β collected, 60 ° >=β >=30 °.
4. LED motorcycle headlamp free form surface integrated optics lens as claimed in claim 2, it is characterised in that: the radius on the described face of cylinder equal to the width L in convex face, the face of cylinder by deflection of light to lateral reflection face.
5. the free form surface integrated optics lens of the LED motorcycle headlamp as described in any one of Claims 1 to 4, it is characterized in that: described lateral reflection face incident ray is the light through face of cylinder deviation, reflection light is parallel rays, and the curve shape in lateral reflection face limits according to the law of refraction and iteration.
CN201521002798.XU 2015-12-05 2015-12-05 Integrated optical lens of free -form surface for LED motorcycle headlamp Expired - Fee Related CN205451061U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106641752A (en) * 2016-11-25 2017-05-10 宁波公牛光电科技有限公司 Light distribution module and lamp
CN108345107A (en) * 2017-01-24 2018-07-31 清华大学 The design method of free form surface lighting system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106641752A (en) * 2016-11-25 2017-05-10 宁波公牛光电科技有限公司 Light distribution module and lamp
CN108345107A (en) * 2017-01-24 2018-07-31 清华大学 The design method of free form surface lighting system
CN108345107B (en) * 2017-01-24 2020-03-17 清华大学 Design method of free-form surface illumination system

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Granted publication date: 20160810

Termination date: 20211205