CN102679265A - Method for realizing homogenized control of light beam by utilizing free-form curved lens - Google Patents

Method for realizing homogenized control of light beam by utilizing free-form curved lens Download PDF

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CN102679265A
CN102679265A CN2011100642527A CN201110064252A CN102679265A CN 102679265 A CN102679265 A CN 102679265A CN 2011100642527 A CN2011100642527 A CN 2011100642527A CN 201110064252 A CN201110064252 A CN 201110064252A CN 102679265 A CN102679265 A CN 102679265A
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lens
light
light source
light beam
form surface
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CN102679265B (en
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谢常青
辛将
朱效立
刘明
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Institute of Microelectronics of CAS
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Institute of Microelectronics of CAS
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Abstract

The invention discloses a method for realizing homogenized control of a light beam by utilizing a free-form curved lens, and the method comprises the following steps of step 1, determining a light distribution form of a light source needing the homogenized control; step 2, determining position information of an area realizing the homogenized control; step 3, determining a lens material; step 4, dividing the homogenized controlled area into a plurality of subareas on the basis of energy conversation law; step 5, establishing a one-one correspondence relation between any subarea in step 4 and a light source emergent angle; and step 6, solving a surface shape of the free-form curved lens according to the refraction law and the correspondence relation in steps 4 and 5. Due to the adoption of the method, the light beam homogenized control of any light source is realized, and the light beam presents uniform light spots in any shape after passing through the curved lens.

Description

A kind of method of utilizing free-form surface lens to realize the even photocontrol of light beam
Technical field
The present invention relates to the Application Optics technical field, particularly a kind of method of utilizing free-form surface lens to realize the even photocontrol of light beam.
Background technology
The light source of present most light source generating means outgoing all is heterogeneous; For example the light of laser instrument output satisfies Gaussian distribution; The light of LED output satisfies lambertian distribution etc., but all needs a kind of uniformity light source preferably in a lot of occasions, or with the photocontrol of the light source outgoing zone at a required given shape; This just need spare photocontrol to light source, so that it satisfies actual needs.
The method that is applied to even photocontrol at present has following several kinds: (1) lenticule is spared optical arrays.This method is mainly formed an array by the micro lens with certain surface type that a series of omnidirectional distribution are arranged, and light beam is through after this array, thus the light of the outgoing superposition generation effect of sparing light each other.This method has higher requirement to the processing and fabricating level of lens, and complex structure, and cost is high.(2) complex lens system.Utilize the combination of a series of lens to form the effect of sparing light.The even light effect of this method is better, but complex structure is with high costs.
In addition, the Beam Control that all can't light source be sent of above several method is in the zone of a given shape.In view of above some, the present invention proposes a kind of novel even photocontrol method for designing based on free-form surface lens.
Summary of the invention
The technical problem that (one) will solve
The technical problem that the present invention will solve is: complexity that overcomes existing even photosystem and the problem that can't control light beam; A kind of novel even photocontrol method for designing based on free-form surface lens is provided; Only utilize lens; Realized the even light to any light source, light also makes the outgoing hot spot be any required shape.
(2) technical scheme
For achieving the above object, the invention provides a kind of method of utilizing free-form surface lens to realize the even photocontrol of light beam, this method comprises:
Step 1:, confirm the light distribution function
Figure BDA0000050676890000021
of light source according to the light source data that provides
Step 2: confirm the shape and the position in target illumination zone according to concrete needs, wherein this target illumination zone is shaped as rectangle;
Step 3:, confirm the refractive index n of lens material according to lens material;
Step 4: the rectangular area is divided into some subregions of crossing rectangular centre; The grid length that each subregion is corresponding satisfy formula
Figure BDA0000050676890000022
wherein
Figure BDA0000050676890000023
be the angle that the line segment of rectangular centre is become with the long limit a of rectangle, i.e.
Step 5: according to law of conservation of energy; Establishment step 4 obtains the one-to-one relationship that area grid
Figure BDA0000050676890000025
is gone up any point
Figure BDA0000050676890000026
and light source angle of emergence θ; Its relation is like formula ∫ I (θ) d θ=∫ Ad ρ; Wherein ρ is the distance of point
Figure BDA0000050676890000027
and rectangular centre, and A is the average intensity value of target area;
The corresponding relation of any point is found the solution curved surface face type according to the law of refraction on step 6:
Figure BDA0000050676890000028
that obtains according to formula in formula and the step 5 in the step 4 and the target rectangle zone; The lens front surface is the plane, makes light normal incidence get into lens, reduces reflection loss; The normal of the point on each grid of back surface satisfy relation formula
Figure BDA00000506768900000210
wherein
Figure BDA00000506768900000211
be the normal and the θ of light source and the angle of
Figure BDA00000506768900000213
direction of a certain grid on the free-form surface lens;
Figure BDA00000506768900000214
is normal and the θ of light source and the angle of
Figure BDA00000506768900000215
direction of a certain grid on the target area; The angle of this light on θ and
Figure BDA00000506768900000217
direction that
Figure BDA00000506768900000216
sends for light source, n is the refractive index of lens.
In the such scheme, the distribution of light sources function described in the step 1
Figure BDA00000506768900000218
is rotational symmetric.
In the such scheme, the length of rectangle described in the step 2 and wide a and the b of being respectively, light source is positioned at h place, rectangular centre the place ahead.
In the such scheme, the lens material described in the step 3 is light transmissive material PMMA or glass.
In the such scheme; Grid described in the step 4 is crossed rectangular centre, and length
Figure BDA00000506768900000219
satisfies formula
Figure BDA00000506768900000220
In the such scheme, the point described in the step 5
Figure BDA0000050676890000031
satisfies formula with light source angle of emergence θ
∫I(θ)dθ＝∫Adρ。
In the such scheme; The front surface of the free-form surface lens described in the step 6 is the plane, and the normal vector of each grid of surface, back satisfies formula
Figure BDA0000050676890000032
(3) beneficial effect
The present invention's advantage compared with prior art is:
(1) the present invention adopts the method for designing of single lens to realize even photocontrol, and is simple in structure, handling ease, and cost is low.
(2) the present invention adopts the free-form surface lens method for designing; Utilize law of conservation of energy to set up point and the one-to-one relationship of the light source angle of emergence in the target area; Thereby make that the light distribution in the target area all has good uniformity for the light source of any light intensity distributions.
(3) the present invention has realized any light source is controlled in the target area of arbitrary shape, has well realized photodistributed restriction.
Description of drawings
Fig. 1 is the structural representation according to free-form surface lens provided by the invention, and 1 is the back surface of being designed, and 2 is front surface;
Fig. 2 is the front view on surface behind the free-form surface lens shown in Figure 1;
Fig. 3 is the side view on surface behind the free-form surface lens shown in Figure 1;
Fig. 4 is light source and target area corresponding relation;
Fig. 5 is for before adding free-form surface lens, the outgoing hot spot of light source;
Fig. 6 is for after adding free-form surface lens, the rectangular light spot that obtains.
The specific embodiment
For making the object of the invention, technical scheme and advantage clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, to further explain of the present invention.
A kind of method of utilizing free-form surface lens to realize the even photocontrol of light beam, this method may further comprise the steps:
Step 1:, confirm that the light distribution function of light source satisfies Gaussian distribution, diameter 10mm according to the light source data that provides;
Step 2: confirm the even light of target zone as required.This example is a rectangle, long a=30mm, and wide b=16mm, light source is from the distance h=10mm of target area;
Step 3: the selection lens material is PMMA, the refractive index n of this material=1.49;
Step 4: the rectangular illumination zone is divided into some grids of crossing rectangular centre; The grid lines segment length satisfies formula 1; Promptly
Figure BDA0000050676890000041
wherein
Figure BDA0000050676890000042
be the angle that the line segment of rectangular centre is become with the long limit a of rectangle, promptly in
Figure BDA0000050676890000043
this example
Figure BDA0000050676890000044
Step 5: Press the formula ∫ I (θ) dθ = ∫ Adρ establish lines
Figure BDA0000050676890000045
any point
Figure BDA0000050676890000046
and the light exit angle
Figure BDA0000050676890000047
the one relationship (Figure 4); where ρ is point
Figure BDA0000050676890000048
with rectangular center, A is the average optical target area strength values ;
Step 6: concern substitution formula (3) with what step 5 obtained; Promptly
Figure BDA0000050676890000049
wherein
Figure BDA00000506768900000411
be θ and the angle of
Figure BDA00000506768900000412
direction of normal and the light source of a certain grid on the free-form surface lens; is normal and the θ of light source and the angle of
Figure BDA00000506768900000414
direction of a certain grid on the target area; The angle of this light on θ and
Figure BDA00000506768900000416
direction that
Figure BDA00000506768900000415
sends for light source; N is the refractive index of lens; Solve light distribution curved surface at different θ; The normal of
Figure BDA00000506768900000417
direction; And then find the solution the coordinate data of each grid on the curved surface, generate the lens entity at last.Behind the lens that obtain among face shape such as the Fig. 1 on surface 1 with shown in Figure 3, the lens front surface is the plane, as among Fig. 12 with shown in Figure 2, light gets into lens in front surface normal incidence, reduces reflection loss.
Step 7: the lens that step 6 is obtained and the light source of step 1 carry out emulation; It is as shown in Figure 6 to obtain light spot shape; And the light spot shape that does not add the lens front light-source is the circle (like Fig. 5) of Gaussian distribution; Can find out that the free-form surface lens that designs by the present invention can obtain rectangular light spot, and illuminance distributes evenly in the rectangular area.
Above-described specific embodiment; The object of the invention, technical scheme and beneficial effect have been carried out further explain, and institute it should be understood that the above is merely specific embodiment of the present invention; Be not limited to the present invention; All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (7)

1. method of utilizing free-form surface lens to realize the even photocontrol of light beam is characterized in that this method comprises:
Step 1:, confirm the light distribution function of light source according to the light source data that provides;
Step 2: confirm the shape and the position in target illumination zone according to concrete needs, wherein this target illumination zone is shaped as rectangle;
Step 3:, confirm the refractive index n of lens material according to lens material;
Step 4: the rectangular area is divided into some subregions of crossing rectangular centre; The grid length that each subregion is corresponding satisfy formula
Figure FDA0000050676880000012
wherein
Figure FDA0000050676880000013
be the angle that the line segment of rectangular centre is become with the long limit a of rectangle, i.e.
Figure FDA0000050676880000014
Step 5: according to law of conservation of energy; Establishment step 4 obtains the one-to-one relationship that area grid
Figure FDA0000050676880000015
is gone up any point
Figure FDA0000050676880000016
and light source angle of emergence θ; Its relation is like formula ∫ I (θ) d θ=∫ Ad ρ; Wherein ρ is the distance of point
Figure FDA0000050676880000017
and rectangular centre, and A is the average intensity value of target area;
The corresponding relation of any point
Figure FDA0000050676880000019
is found the solution curved surface face type according to the law of refraction on step 6:
Figure FDA0000050676880000018
that obtains according to formula in formula and the step 5 in the step 4 and the target rectangle zone; The lens front surface is the plane, makes light normal incidence get into lens, reduces reflection loss; The normal of the point on each grid of back surface satisfy relation formula
Figure FDA00000506768800000110
wherein
Figure FDA00000506768800000111
Figure FDA00000506768800000112
be the normal and the θ of light source and the angle of
Figure FDA00000506768800000113
direction of a certain grid on the free-form surface lens;
Figure FDA00000506768800000114
is normal and the θ of light source and the angle of
Figure FDA00000506768800000115
direction of a certain grid on the target area; The angle of this light on θ and
Figure FDA00000506768800000117
direction that
Figure FDA00000506768800000116
sends for light source, n is the refractive index of lens.
2. the method for utilizing free-form surface lens to realize the even photocontrol of light beam according to claim 1; It is characterized in that the distribution of light sources function described in the step 1
Figure FDA00000506768800000118
is rotational symmetric.
3. the method for utilizing free-form surface lens to realize the even photocontrol of light beam according to claim 1 is characterized in that, the length of rectangle described in the step 2 and wide a and the b of being respectively, and light source is positioned at h place, rectangular centre the place ahead.
4. the method for utilizing free-form surface lens to realize the even photocontrol of light beam according to claim 1 is characterized in that the lens material described in the step 3 is light transmissive material PMMA or glass.
5. the method for utilizing free-form surface lens to realize the even photocontrol of light beam according to claim 1; It is characterized in that; Grid described in the step 4 is crossed rectangular centre, and length satisfies formula
Figure FDA0000050676880000022
6. the method for utilizing free-form surface lens to realize the even photocontrol of light beam according to claim 1; It is characterized in that the point described in the step 5 satisfies formula with light source angle of emergence θ
∫I(θ)dθ＝∫Adρ。
7. the method for utilizing free-form surface lens to realize the even photocontrol of light beam according to claim 1; It is characterized in that; The front surface of the free-form surface lens described in the step 6 is the plane, and the normal vector of each grid of surface, back satisfies formula
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Cited By (6)

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Publication number Priority date Publication date Assignee Title
CN107678152A (en) * 2017-09-04 2018-02-09 华南理工大学 LED free-form surface lens for optical microphotograph mirror reflection illuminator
JP2018120206A (en) * 2017-01-23 2018-08-02 セイコーエプソン株式会社 Lighting system and projector
CN108758539A (en) * 2018-07-16 2018-11-06 广州市明道灯光科技股份有限公司 Convenient for the specular removal stage lighting light path system and lighting method of lighting
WO2019183955A1 (en) * 2018-03-30 2019-10-03 深圳市大疆创新科技有限公司 Unmanned aerial vehicle and method for designing lens
CN111443483A (en) * 2020-04-24 2020-07-24 中国科学院云南天文台 Design method of beam shaping structure based on free-form surface lens
WO2021093669A1 (en) * 2019-11-11 2021-05-20 苏州欧普照明有限公司 Lighting device and lighting system

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018120206A (en) * 2017-01-23 2018-08-02 セイコーエプソン株式会社 Lighting system and projector
CN107678152A (en) * 2017-09-04 2018-02-09 华南理工大学 LED free-form surface lens for optical microphotograph mirror reflection illuminator
CN107678152B (en) * 2017-09-04 2019-10-18 华南理工大学 LED free-form surface lens for optical microphotograph mirror reflection lighting system
WO2019183955A1 (en) * 2018-03-30 2019-10-03 深圳市大疆创新科技有限公司 Unmanned aerial vehicle and method for designing lens
CN108758539A (en) * 2018-07-16 2018-11-06 广州市明道灯光科技股份有限公司 Convenient for the specular removal stage lighting light path system and lighting method of lighting
WO2021093669A1 (en) * 2019-11-11 2021-05-20 苏州欧普照明有限公司 Lighting device and lighting system
CN111443483A (en) * 2020-04-24 2020-07-24 中国科学院云南天文台 Design method of beam shaping structure based on free-form surface lens

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