CN103912844B - The optical system that LED uniformly collimates - Google Patents
The optical system that LED uniformly collimates Download PDFInfo
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- CN103912844B CN103912844B CN201410126291.9A CN201410126291A CN103912844B CN 103912844 B CN103912844 B CN 103912844B CN 201410126291 A CN201410126291 A CN 201410126291A CN 103912844 B CN103912844 B CN 103912844B
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Abstract
The present invention relates to the collimating optical system technical field of LED illumination, it is specifically related to the optical system that a kind of LED uniformly collimates, it is 0.01m 0.1m including the first free-form surface lens and second free-form surface lens of coaxial setting, the first free-form surface lens and the second free-form surface lens spacing；First free-form surface lens includes first surface, for rotationally symmetrical free form surface；Second curved surface, for rotationally symmetrical free form surface；3rd curved surface, for rotating parabola；5th curved surface, for rotationally symmetrical free form surface；And the 4th curved surface, for the face of cylinder, for connecting the 3rd curved surface and the 5th curved surface；Described second free-form surface lens, is made up of three curved surfaces, and wherein first surface is free form surface, controls the direction of the light beam that the second free-form surface lens sends, the second curved surface and the 3rd curved surface and is respectively connection curved surface and the beam projecting face of lens.The present invention has good light control ability, the light of LED can be shaped as uniform circular light spot.
Description
Technical field
The present invention relates to the collimating optical system technical field of LED illumination, be specifically related to the optical system that a kind of LED uniformly collimates.
Technical background
LED is as a kind of new type light source, and due to its specular removal, the advantages such as the life-span is long, nonhazardous make it the perfect replacer becoming traditional light source such as electric filament lamp, fluorescent lamp.But owing to the light distribution of LED is circular Lambertian distribution, if directly applying to illumination, then the most uneven Illumination Distribution can be formed in target face, it is impossible to meet the requirement to light fixture optical property of the various illumination occasion.In order to make LED preferably be applied to lighting field, designs secondary optics system is needed to redistribute the light distribution of LED so that it can be formed uniformly or other specific Illumination Distribution in target face.
Illuminate application scenario at optic communication, photoelectronic imaging etc., not only need Uniform Illumination, in addition it is also necessary to light is collimated light.To this end, at least need two optical surfaces to control the direction of LED light line, wherein first curved is uniformly distributed, and second curved surface changes radiation direction and be collimated.Chinese invention patent application description CN103148443 A proposes a kind of double free form surface thick lenses for obtaining uniform parallel light beam and the method for designing of array thereof.This thick lens includes two free form surfaces, it is possible to obtain for the uniform collimated ray of LED light source.There is total reflection phenomenon yet with between different refractivity medium, the most this lens can not collect whole light of LED, and the light efficiency that therefore can cause lens is not high enough, affects the propagation distance of whole system.
Summary of the invention
It is an object of the invention to need the occasion of collimated illumination for optic communication, photoelectronic imaging etc., design the optical system that a kind of LED realizing the uniform collimated illumination of circular light spot uniformly collimates, this optical system can collect whole light of LED, has higher light efficiency.
For achieving the above object, the optical system that the LED designed by the present invention uniformly collimates, is 0.01m-0.1m including the first free-form surface lens and second free-form surface lens of coaxial setting, described first free-form surface lens and the second free-form surface lens spacing；
Described first free-form surface lens includes first surface, for rotationally symmetrical free form surface, for the light refraction sent by LED, makes the light ray parallel after refraction in z-axis；Second curved surface, for rotationally symmetrical free form surface, for the light refraction sent by LED, makes the light after refraction become the light sent with point source in x-axis and overlaps；3rd curved surface, for rotationally symmetrical parabola, paraboloidal focus is the virtual optical source point of the second curved refractive light；5th curved surface, for rotationally symmetrical free form surface, for controlling to be parallel to the light of z-axis after first surface, the second curved surface and the 3rd curved surface so that this bundle is parallel to the light of z-axis and is forming uniform Illumination Distribution on any one disk vertical with z-axis in space after the 5th curved surface；And the 4th curved surface, for the face of cylinder, for connecting the 3rd curved surface and the 5th curved surface；
Described second free-form surface lens, it is made up of three curved surfaces, wherein the first surface of the second free-form surface lens is free form surface, controlling the direction of the light beam that the second free-form surface lens sends, the second curved surface of the second free-form surface lens and the 3rd curved surface are respectively connection curved surface and the beam projecting face of lens；On the first surface of described first free-form surface lens and the second curved surface of the first free-form surface lens, the coordinate of point is calculated by following formula: set the initial point of first surface of the first free-form surface lens, obtains its contour line by following formula iteration:
Wherein (xi,zi) it is the coordinate of the calculative point of current iteration, (xi-1,zi-1) it is the coordinate of former point, (Nx,Nz) it is the normal vector coordinate of former point, after obtaining contour curve, i.e. can get whole curved surface with z-axis for axis of symmetry rotating 360 degrees.
Yet further, the z-axis coordinate simultaneous of the coordinate of described 5th surface points and the first surface of the second free-form surface lens is asked for obtaining, if the coordinate of point is respectively (x on the free form surface of the 5th curved surface and the second free-form surface lens1,y1,z1) and (x2,y2,z2), the angular region of light source is divided into M × N part, the luminous flux in every part is identical, calculates the x of the 5th curved surface of correspondence, y-axis coordinate.The cross section of emergent light spot is divided into the unit of M × N number of area equation simultaneously, and calculate the x of corresponding point on the free form surface of the second free-form surface lens, y-axis coordinate, the initial point of selected two curved surfaces, solving the z-axis coordinate of point on initial scaffold curve by the method for iteration is:
Wherein (x1,i,y1,i,z1,i) and (x2,i,y2,i,z2,i) it is the coordinate of point, (x on the 5th curved surface of calculative first free-form surface lens of current iteration and the first surface of the second free-form surface lens1,i-1,y1,i-1,z1,i-1) and (x2,i-1,y2,i-1,z2,i-1) it is the coordinate of corresponding former point, (N1x,N1y,N1z) and (N2x,N2y,N2z) it is the normal vector coordinate of former point, next skeleton curve is obtained by (2) formula iteration after obtaining initial scaffold curve, after obtaining all skeleton curves, by the way of setting-out, obtain the first free form surface of the 5th curved surface and the second free-form surface lens.
The design LED of the present invention uniformly collimates secondary optical system, there is good light control ability, the light of LED can be shaped as uniform circular light spot, because have employed fully reflecting surface during LED light line plane of incidence collimation, the light of whole LED therefore can be collected without because total reflection reduces the light efficiency of optical system.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram that the present invention one is embodied as.
The side view of Fig. 2 Fig. 1.
The sectional view of Fig. 3 Fig. 2.
Fig. 4 is the side view of the second free-form surface lens (2) in Fig. 1.
Fig. 5 is the sectional view of Fig. 4.
Fig. 6 .1 is the simulation result figure of the Illumination Distribution being embodied in optical design software in target face；
Fig. 6 .2 is to be embodied in optical design software in emergent light spot target face the simulation result figure of Illumination Distribution on two centre coordinate axles；
In figure, 1-the first free-form surface lens, 11-first surface；12-the second curved surface；13-the 3rd curved surface；14-the 4th curved surface；15-the 5th curved surface；2-the second free-form surface lens；21-free form surface；22-connects curved surface；23-beam projecting face.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
The optical system that LED shown in Fig. 1-4 uniformly collimates, including the first free-form surface lens 1 and the second free-form surface lens 2 of coaxial setting, the first free-form surface lens 1 and the second free-form surface lens 2 spacing are 0.01m-0.1m；First free-form surface lens 1 includes first surface 11, for rotationally symmetrical free form surface, for the light refraction sent by LED, makes the light ray parallel after refraction be determined by the refractive index of lens material with the angle of z-axis in z-axis, the LED light line that this free form surface controls；Second curved surface 12, for rotationally symmetrical free form surface, for the light refraction sent by LED, makes the light after refraction become the light sent with point source in x-axis and overlaps；3rd curved surface 13, for rotating parabola, paraboloidal focus is the virtual optical source point of the second curved refractive light；5th curved surface 15, for rotationally symmetrical free form surface, for controlling to be parallel to the light of z-axis through first surface the 11, second curved surface 12 and the 3rd curved surface 13 after so that this restraints the light being parallel to z-axis and is forming uniform Illumination Distribution on any one disk vertical with z-axis in space after the 5th curved surface 15；And the 4th curved surface 14, for the face of cylinder, for connecting the 3rd curved surface 13 and the 5th curved surface 15；Second free-form surface lens 2, it is made up of three curved surfaces, wherein the first surface of the second free-form surface lens 2 is free form surface 21, controlling the direction of the light beam that the second free-form surface lens 2 sends, the second curved surface of the second free-form surface lens 2 and the 3rd curved surface are respectively connection curved surface 22 and the beam projecting face 23 of lens；On the first surface 11 of described first free-form surface lens 1 and the second curved surface 12 of the first free-form surface lens 1, the coordinate of point is calculated by following formula: set the initial point of the first surface of the first free-form surface lens 1, obtains its contour line by following formula iteration:
Wherein (xi,zi) it is the coordinate of the calculative point of current iteration, (xi-1,zi-1) it is the coordinate of former point, (Nx,Nz) it is the normal vector coordinate of former point, after obtaining contour curve, i.e. can get whole curved surface with z-axis for axis of symmetry rotating 360 degrees.
The coordinate of the 5th 15, curved surface and the first surface 21 of the second free-form surface lens 2 z-axis coordinate simultaneous ask for obtaining, if the coordinate of point is respectively (x on the free form surface 21 of the 5th curved surface 15 and the second free-form surface lens 21,y1,z1) and (x2,y2,z2), the angular region of light source is divided into M × N part, the luminous flux in every part is identical, calculates the x of the 5th curved surface 15 of correspondence, y-axis coordinate.The cross section of emergent light spot is divided into the unit of M × N number of area equation simultaneously, and calculate the x of corresponding point, y-axis coordinate on the free form surface 21 of corresponding second free-form surface lens 2, the initial point of selected two curved surfaces, solving the z-axis coordinate of point on initial scaffold curve by the method for iteration is:
Wherein (x1,i,y1,i,z1,i) and (x2,i,y2,i,z2,i) it is the coordinate of point, (x on the 5th curved surface of calculative first free-form surface lens of current iteration and the first surface of the second free-form surface lens1,i-1,y1,i-1,z1,i-1) and (x2,i-1,y2,i-1,z2,i-1) it is the coordinate of corresponding former point, (N1x,N1y,N1z) and (N2x,N2y,N2z) it is the normal vector coordinate of former point, next skeleton curve is obtained by (2) formula iteration after obtaining initial scaffold curve, after obtaining all skeleton curves, by the way of setting-out, obtain the 5th curved surface 15 and the free form surface 21 of the second free-form surface lens 2.
As a specific embodiment of the present invention, LED is positioned at zero.This optical system includes two parts, the first free-form surface lens 1 and the second free-form surface lens 2.
Fig. 2 and Fig. 3 is side-looking and the sectional view of the first free-form surface lens 1 in Fig. 1, and wherein first surface the 11, second curved surface the 12, the 3rd curved surface 13 is the plane of incidence of LED light line, it is therefore an objective to the spherical wave collimation sent by LED is the plane wave vertical with z-axis.
Light from LED is refracted to parallel with z-axis by first surface 11, and this curved surface is rotational symmetric, only need to calculate a contour curve, then turn around around z-axis rotation and i.e. can get the face type of first surface 11 when therefore calculating.When calculating contour curve, it is first determined the coordinate figure of initial point, initial point is the intersection point of curved surface and z-axis, calculates the coordinate figure of point on contour curve by the way of iteration.Make currently known point (xi-1,zi-1) normal vector be N=(Nx,Nz), incident ray and the angle of z-axis that contour curve subsequent point to be calculated is corresponding are θi, then coordinate figure (the x of subsequent pointi,zi) it is:
Wherein k=Nx/Nz.The z coordinate value of the initial point implementing mean camber S11 at this is 5mm, and curved edges correspondence LED light line and z-axis angle are 30o.
The purpose of the second curved surface 12 is so that the reverse extending line of light that LED the sends emergent ray after this curved refractive meets at x-axis a bit, thus obtains a virtual optical source point.The marginal point that initial point is first surface 11 of the second curved surface 12, uses (1) equally during calculating.
The focus of the 3rd curved surface 13 is the virtual optical source point that the second curved surface 12 is created, and utilizes total reflection principle, is reflexed to and z-axis parallel direction by the light from the second curved surface 12.
The energy by the plane wave after curved surface first surface the 11, second curved surface 12 and the 3rd curved surface 13 of the 5th curved surface 15 is redistributed so that certain center is formed in z-axis and on the disk vertical with z-axis and is uniformly distributed in space.On 4th curved surface 14, the coordinate calculation of point is for utilizing preservation of energy, incident wavefront and target circle plane are divided into the grid that energy is equal, determine that the corresponding relation between mesh point, recycling (1) formula can calculate the coordinate of point on the 5th curved surface 15 according to space topological.Owing to the 5th curved surface 15 is rotational symmetric, therefore have only to calculate contour curve and i.e. can get curved surface face type.In this enforcement, this disk is positioned at z=70mm, and radius is 20mm, and the initial point of the 5th curved surface 15 is (0,0,17.36).
After being calculated all curved surfaces of the first free-form surface lens 1, a height of 20.55mm, a width of 32.44mm.The a height of 5mm in space, a width of 4.9mm formed between first surface 11 and the second curved surface 12, is used for placing LED light source.
Fig. 4 and Fig. 5 is side-looking and the sectional view of the second free-form surface lens 12 in Fig. 1.The second free-form surface lens 2 in this enforcement is made up of free form surface 21, connection curved surface 22, beam projecting face 23.
Connection curved surface 22, beam projecting face 23 are joint face and the beam projecting face of lens, the most do not change the exit direction of light.
The purpose of free form surface 21 is to be refracted to and z-axis parallel direction by the light beam from the first free-form surface lens 1.Using Snell's law to calculate the coordinate of point on free form surface, computational methods still use formula (1).
Fig. 6 .1 and Fig. 6 .2 is the simulation result of emergent light spot being originally implemented in obtaining in optical design software, obtained by 1,000,000 light of trace, wherein Fig. 6 .1 is the Illumination Distribution in target face, in figure, gray value size is directly proportional to brightness value, and Fig. 6 .2 is the Illumination Distribution in target face on two centre coordinate axles.Simulation result shows that the optical efficiency of the lens combination of this enforcement is 80.82%.Illuminance uniformity in x-axis and y-axis is 75%, and uniformity is good.
Claims (1)
1. the optical system that a LED uniformly collimates, it is characterized in that including: first free-form surface lens (1) of coaxial setting and the second free-form surface lens (2), described first free-form surface lens (1) and the second free-form surface lens (2) spacing are 0.01m-0.1m；
Described first free-form surface lens (1) includes first surface (11), for rotationally symmetrical free form surface, for the light refraction sent by LED, makes the light ray parallel after refraction in z-axis；Second curved surface (12), for rotationally symmetrical free form surface, for the light refraction sent by LED, makes the light after refraction become the light sent with point source in x-axis and overlaps；3rd curved surface (13), for rotationally symmetrical parabola, paraboloidal focus is the virtual optical source point of the second curved refractive light；5th curved surface (15), for rotationally symmetrical free form surface, for controlling to be parallel to the light of z-axis after first surface (11), the second curved surface (12) and the 3rd curved surface (13) so that this restraints the light being parallel to z-axis and is forming uniform Illumination Distribution on any one disk vertical with z-axis in space after the 5th curved surface (15)；And the 4th curved surface (14), for the face of cylinder, for connecting the 3rd curved surface (13) and the 5th curved surface (15)；
Described second free-form surface lens (2), it is made up of three curved surfaces, wherein the first surface of the second free-form surface lens (2) is free form surface (21), controlling the direction of the light beam that the second free-form surface lens (2) sends, the second curved surface of the second free-form surface lens (2) and the 3rd curved surface are respectively connection curved surface (22) and beam projecting face (23) of lens；The coordinate of the upper point of the first surface (11) of described first free-form surface lens (1) and second curved surface (12) of the first free-form surface lens (1) is calculated by following formula: set the initial point of the first surface of the first free-form surface lens (1), obtains its contour line by following formula iteration:
Make currently known point (xi-1,zi-1) normal vector be N=(Nx,Nz), incident ray and the angle of z-axis that contour curve subsequent point to be calculated is corresponding are θi, k=Nx/Nz,
Wherein (xi,zi) it is the coordinate of the calculative point of current iteration, (xi-1,zi-1) it is the coordinate of former point, (Nx,Nz) it is the normal vector coordinate of former point, after obtaining contour curve, i.e. can get whole curved surface with z-axis for axis of symmetry rotating 360 degrees；Coordinate and the z-axis coordinate simultaneous of the first surface (21) of the second free-form surface lens (2) that described 5th curved surface (15) is put are asked for obtaining, if the coordinate of the upper point of the free form surface (21) of the 5th curved surface (15) and the second free-form surface lens (2) is respectively (x1,y1,z1) and (x2,y2,z2), the angular region of light source is divided into M × N part, luminous flux in every part is identical, calculate the x of the 5th curved surface (15) of correspondence, y-axis coordinate, the cross section of emergent light spot is divided into the unit of M × N number of area equation simultaneously, and free form surface (21) the upper x of corresponding point, the y-axis coordinate calculating the second free-form surface lens (2), the initial point of selected two curved surfaces, solving the z-axis coordinate of point on initial scaffold curve by the method for iteration is:
Wherein (x1,i,y1,i,z1,i) and (x2,i,y2,i,z2,i) it is the coordinate of point, (x on the 5th curved surface of calculative first free-form surface lens of current iteration and the first surface of the second free-form surface lens1,i-1,y1,i-1,z1,i-1) and (x2,i-1,y2,i-1,z2,i-1) it is the coordinate of corresponding former point, (N1x,N1y,N1z) and (N2x,N2y,N2z) it is the normal vector coordinate of former point, next skeleton curve is obtained by (2) formula iteration after obtaining initial scaffold curve, after obtaining all skeleton curves, by the way of setting-out, obtain the free form surface (21) of the 5th curved surface (15) and the second free-form surface lens (2).
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| TWI589931B (en) * | 2015-08-24 | 2017-07-01 | 尚立光電股份有限公司 | Combiner of? optical device |
| CN107477424A (en) * | 2017-01-13 | 2017-12-15 | 大连工业大学 | A kind of varifocal optical system based on LED light source |
| CN107270241B (en) * | 2017-06-19 | 2019-07-12 | 江苏亿诺车辆部件有限公司 | A kind of automobile lamp lens |
| CN109539163B (en) * | 2017-07-31 | 2021-05-28 | 长春海拉车灯有限公司 | Optical lens and have optical lens's optical module, vehicle headlamps |
| CN108917598A (en) * | 2018-06-28 | 2018-11-30 | 武汉华星光电技术有限公司 | A kind of wet equipment and its sensing device |
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| US6724543B1 (en) * | 2002-10-23 | 2004-04-20 | Visteon Global Technologies, Inc. | Light collection assembly having mixed conic shapes for use with various light emitting sources |
| CN103162234A (en) * | 2012-12-19 | 2013-06-19 | 重庆绿色智能技术研究院 | Lens for ultraviolet light-emitting diode (LED) collimation |
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| JP4436396B2 (en) * | 2007-09-28 | 2010-03-24 | 株式会社プラテック | Lighting module, light source unit, and lighting fixture |
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| US6724543B1 (en) * | 2002-10-23 | 2004-04-20 | Visteon Global Technologies, Inc. | Light collection assembly having mixed conic shapes for use with various light emitting sources |
| CN103162234A (en) * | 2012-12-19 | 2013-06-19 | 重庆绿色智能技术研究院 | Lens for ultraviolet light-emitting diode (LED) collimation |
| CN203893069U (en) * | 2014-03-31 | 2014-10-22 | 中国人民解放军海军工程大学 | Optical system for uniformly collimating LED (light-emitting diode) |
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