CN102679265A - Method for realizing light beam dodging control by utilizing free-form surface lens - Google Patents
Method for realizing light beam dodging control by utilizing free-form surface lens Download PDFInfo
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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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- 239000000463 material Substances 0.000 claims abstract description 11
- 238000005286 illumination Methods 0.000 claims description 5
- 238000005315 distribution function Methods 0.000 claims description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 3
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- 239000011521 glass Substances 0.000 claims description 2
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Abstract
The invention discloses a method for realizing light beam dodging control by utilizing a free-form surface lens, which comprises the following steps: step 1: determining the light distribution form of a light source needing dodging control; step 2: determining position information of a control area for realizing uniform light; and step 3: determining a lens material; and 4, step 4: dividing the uniform light control area into a plurality of sub-areas based on the law of conservation of energy; and 5: establishing a one-to-one corresponding relation between any sub-area in the step 4 and the light source emergence angle; step 6: and solving the surface type of the free-form-surface lens based on the refraction law and the corresponding relation of the steps 4 and 5. The invention realizes the light beam dodging control of any light source, and the light beam passing through the free-form surface lens presents uniform light spots in any shape.
Description
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
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
wherein
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
is gone up any point
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
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:
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
wherein
be the normal and the θ of light source and the angle of
direction of a certain grid on the free-form surface lens;
is normal and the θ of light source and the angle of
direction of a certain grid on the target area; The angle of this light on θ and
direction that
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
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
satisfies formula
In the such scheme, the point described in the step 5
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
(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
wherein
be the angle that the line segment of rectangular centre is become with the long limit a of rectangle, promptly in
this example
Step 5: Press the formula ∫ I (θ) dθ = ∫ Adρ establish lines
any point
and the light exit angle
the one relationship (Figure 4); where ρ is point
with rectangular center, A is the average optical target area strength values ;
Step 6: concern substitution formula (3) with what step 5 obtained; Promptly
wherein
be θ and the angle of
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
direction of a certain grid on the target area; The angle of this light on θ and
direction that
sends for light source; N is the refractive index of lens; Solve light distribution curved surface at different θ; The normal of
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
wherein
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
is gone up any point
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
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:
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
wherein
be the normal and the θ of light source and the angle of
direction of a certain grid on the free-form surface lens;
is normal and the θ of light source and the angle of
direction of a certain grid on the target area; The angle of this light on θ and
direction that
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
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
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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| Application Number | Priority Date | Filing Date | Title |
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| CN201110064252.7A CN102679265B (en) | 2011-03-17 | 2011-03-17 | Method for realizing light beam dodging control by utilizing free-form surface lens |
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| CN201110064252.7A CN102679265B (en) | 2011-03-17 | 2011-03-17 | Method for realizing light beam dodging control by utilizing free-form surface lens |
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| CN102679265B CN102679265B (en) | 2014-04-09 |
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Cited By (6)
| 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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| US20100265723A1 (en) * | 2009-04-21 | 2010-10-21 | Jian-Lin Zhou | Optical transformation device |
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Cited By (7)
| 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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