CN102287754A - Method for designing lens with uniform square light spot - Google Patents
Method for designing lens with uniform square light spot Download PDFInfo
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- CN102287754A CN102287754A CN201010204040XA CN201010204040A CN102287754A CN 102287754 A CN102287754 A CN 102287754A CN 201010204040X A CN201010204040X A CN 201010204040XA CN 201010204040 A CN201010204040 A CN 201010204040A CN 102287754 A CN102287754 A CN 102287754A
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000003287 optical effect Effects 0.000 claims abstract description 24
- 230000004907 flux Effects 0.000 claims abstract description 6
- 230000000977 initiatory effect Effects 0.000 claims description 13
- 238000005286 illumination Methods 0.000 claims description 11
- 239000012780 transparent material Substances 0.000 claims description 2
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- 238000010586 diagram Methods 0.000 description 7
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Abstract
The invention discloses a method for designing a lens with a uniform square light spot. The method comprises the following steps of: firstly dividing the square light spot into eight centrosymmetric areas along an axis of symmetry, and partitioning one of the eight centrosymmetric areas into n (n is larger than or equal to 2) angular areas, wherein the difference of the lengths of two angle edges of each angular area is constant; respectively taking one plane formed by one angular edge passing through each angular area and an optical axis as an incidence surface, partitioning a luminous area of a light source on the incidence surface arranged on one side of the optical axis into a plurality of small angles according to luminous intensity along a distribution rule of luminous angles so as to make the luminous fluxes of lights distributed in each small angle equal, partitioning the angular edge of each incidence surface into a plurality of small sections one-to-one corresponding to the small angles, sequentially obtaining the shapes of the sections of a lens on a first surface and a second surface of each incidence surface according to a refraction law, and respectively rotating the sections of the lens around the optical shaft in an angular area, wherein the optical shaft is arranged in the angular area, and a rotation angle is equal to the angle of the angular area; and obtaining the octant shape of the lens; and obtaining the whole shape of the lens according to a centrosymmetry raw. The method disclosed by the invention is simple, visualized and flexible.
Description
Technical field
The present invention relates to a kind of method for designing of optical element, more particularly, relate to the lens design method that a kind of face to be illuminated is square uniform light spots.
Background technology
When LED is used for the engineering illumination,, designs different lens and carry out luminous intensity distribution often according to different use occasions or customer requirement.In some use occasions, such as underground garage, square etc. are not wished to use too many light fixture usually, but are wished that illumination can be even.If when adopting face to be illuminated be light spot shape such as circle, ellipse, under the situation that does not increase light fixture quantity,, the dark space will certainly occur and shine blind spot, and the uneven illumination of face to be illuminated is spared at the joining place of adjacent light fixture.Thereby be difficult to reach client's instructions for use.Few for the light fixture realizing using but regional illumination irradiation is even, the best way is and adopts foursquare irradiation hot spot to solve, and how to carry out the lens design of square uniform light spots, and then being needs the problem that solves at present.
Summary of the invention
The present invention provides a kind of lens design method of square uniform light spots for solving the problems of the technologies described above, and this method can obtain the square uniform irradiation hot spot of arbitrary accuracy by the simple and direct computing.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of lens design method of square uniform light spots, optical axis is through spot center and perpendicular to plane, hot spot place, its design procedure is as follows:
A), square hot spot is divided into the centrosymmetric zones that eight angles are 45 degree along symmetry axis, get the object of one of them zone, this zone is divided into the individual angular region of n (n 〉=2), and the length difference of two arms of angle of each angular region is equated as the design.
B), get a unidirectional arm of angle of each angular region respectively, plane with this arm of angle of mistake and optical axis is the plane of incidence, on this plane of incidence, the light-emitting zone that light source is positioned at a side of optical axis is divided into a plurality of little angles according to luminous intensity with the regularity of distribution of lighting angle, and the luminous flux that is distributed in each little angle is equated;
C), the arm of angle on described each plane of incidence is divided into a plurality of segments, described segment is corresponding one by one with described little angle, and the length of adjusting each segment is inversely proportional to itself and the light source square distance of illuminated point to this segment, is directly proportional with illumination; Shone segment with edge segment in the described segment as initial, with marginal point is initial illuminated point, a promptly corresponding described little angle, leave the required distance of light source according to lens first face, getting on the incident ray corresponding a bit as the initiation feature point on first on the lens with initial illuminated point, at this some place, the straight line that is parallel to light source and initial illuminated point line forms an angle with incident ray, initial deflection of light angle for lens, according to predetermined ratio, described deflection angle is divided into first deflection angle and second deflection angle, the angle separated time as incident ray through the fringence behind first on the lens, by the law of refraction and the little angle of described correspondence, obtain second characteristic point adjacent with initiation feature point, second illuminated point that this second characteristic point is corresponding adjacent with initial illuminated point according to above-mentioned identical step, is obtained the position of each characteristic point on pairing first of each illuminated point successively; On the fringence behind the initiation feature point on passing through described first, to ask for a bit as the initiation feature point on second on the lens according to lens thickness, adopt and the similar method of characteristic point of trying to achieve on first, try to achieve the position of each characteristic point on second; With described first with second on each characteristic point be connected successively, form lens first cross sectional shape and second cross sectional shape on each plane of incidence respectively;
D), the lens cross section on above-mentioned each plane of incidence of trying to achieve is successively rotated in this angular region respectively around optical axis, its anglec of rotation equates with the angle of this angular region, tries to achieve 1/8th shapes of lens thus; According to the center law of symmetry, and then try to achieve the global shape of lens.
Described each characteristic point couples together with straight line or smoothed curve successively.
When light source is LED, and lens diameter is during less than 30mm, described angular region quantity n≤10.
Described lens employing refractive index is the transparent material between the 1.34.2.
Technical solution of the present invention is by being divided into design object n angular region, try to achieve the cross sectional shape of lens on the pairing plane of incidence in each angular region respectively, then this cross section is rotated with the angle identical with the angle of this angular region around optical axis in this angular region, obtain 1/8th shapes of lens, at last, according to the center symmetry principle, obtain the lens global shape.The design's method is simple, and is directly perceived, and the size of the quantity n by the regional inner corner region selecting to be divided is determined the hot spot that forms and the error size of standard square hot spot.This n value is big more, and square more is near the mark.But for the LED spot light, the size of lens is done all not quite in actual the use, and because the restriction of the processing technology level of lens at present, when the n value is bigger, more relatively edge, angular region can be owing to can't be processed into the wedge angle of the strictness inactive area that made the light directive that shines these positions, not only influence the uniformity, and cause the waste of light source.And, for the smaller lens of size, when the n value is bigger, the even problem of the light uneven illumination at the more relatively edge, angular region that can't be processed into strict wedge angle relatively can be bigger to the influence of whole illuminance uniformity, therefore in actual design, the value of n more than or equal to 2 smaller or equal to 10.
Description of drawings
Below by accompanying drawing method for designing of the present invention is done further detailed description:
Fig. 1 is the method for designing schematic diagram that aligns square focus spot zoning and angular region;
Fig. 2 is a method schematic diagram of dividing little angle in Fig. 1 on pairing plane of incidence in angular region;
Fig. 3 is to being positioned at the method schematic diagram of the arm of angle division segment on Fig. 2 plane of incidence;
Fig. 4 determines lens each characteristic point on Fig. 2 plane of incidence and method one schematic diagram that connects successively;
Fig. 5 is the method two schematic diagram that each characteristic point on Fig. 4 plane of incidence is connected successively;
Fig. 6 rotates lens 1/8th shape schematic diagrames that form with lens cross section shown in Figure 5 around optical axis;
Fig. 7 is the structural representation of overall lens;
Fig. 8 is the front view of Fig. 7;
Fig. 9 is the bottom installed surface view of Fig. 7;
Figure 10 is the actual test hot spot figure of lens shown in Figure 7;
Figure 11 is the actual test Illumination Distribution figure of lens shown in Figure 7.
The specific embodiment
Below by figure and text description the specific design step of the design's method is done a detailed explanation.
As shown in Figure 1, at first square hot spot is divided into the centrosymmetric zone that eight angles are 45 degree along symmetry axis, as design object of the present invention, following design procedure is all finished in this zone 10 with one of them zone 10.Should be divided into the individual angular region of n (n 〉=2) in zone 10, for illustrate clear for the purpose of, present embodiment is divided into three angular regions, its angle is respectively γ 1, γ 2, γ 3,, its arm of angle is respectively 11 and 22,22 and 33,33 and 44, the length difference of two arms of angle of each angle is d.
As shown in Figure 2, be that the angular region of γ 1 is initial with the angle, the plane of crossing the optical axis L of an one arm of angle 11 and light source 3 is first plane of incidence.On this plane of incidence, the light-emitting zone that light source 3 is positioned at a side of optical axis L is divided into four little angle α 1, α 2, α 3 according to luminous intensity with the regularity of distribution of lighting angle, and α 4, and the luminous flux that is distributed in the light in each little angle is equated.
As shown in Figure 3, the arm of angle 11 that will be positioned on first plane of incidence is divided into four segment ab, bc, cd, de.With α 1, α 2 respectively, and α 3, and α 4 is corresponding one by one.Adjust the length of each segment, make itself and light source 3 to this segment illuminated point apart from square being inversely proportional to of r, and be directly proportional with the illumination E in desired area to be illuminated territory.
As shown in Figure 4, being shone segment with the ab section as initial, is initial illuminated point with a point, and then the little angle of this ab section correspondence is α 1.According to first 1 required distance that leaves light source 3 of lens, on the incident ray corresponding, get 1 1a with a point, as the initiation feature point on first 1 on the lens, at this characteristic point place, the straight line that is parallel to the line of light source 3 and illuminated point a forms an angle β 1 with incident ray, and this angle is the initial deflection of light angle of lens.According to predefined ratio, this deflection angle β 1 is divided into two parts, the first deflection angle β 11 and the second deflection angle β 12, present embodiment is got β 11: β 12=1: 1, and the angle separated time passes through the law of refraction as the fringence of incident ray after through first 1 initiation feature point 1a, determine the normal n1 that 1a is ordered, straight line and described plane of light incidence perpendicular to normal n1 form an intersection, and the intersection point of the arm of angle of this intersection and little angle β 1 is respectively 1a and 1b, and the 1b point is promptly as second characteristic point.Second by according on the segment bc, getting b point is second illuminated point, then b point correspondence this second characteristic point 1b.According to the above-mentioned method of determining the second characteristic point 1b, try to achieve characteristic point 1c, 1d, 1e on pairing first 1 of illuminated point c, d, the e successively.
Requirement according to lens thickness, get the initiation feature point of 1 2a on the fringence behind the initiation feature point 1a on through first 1 as second 2, with the incident ray of this fringence as second 2 on lens, with the straight line that is parallel to the line of illuminated point a and light source at this 2a point is the fringence of second 2 on lens, this incident ray and fringence direction are two arm of angle directions of the illustrated second deflection angle β 12, adopt and the identical method of characteristic point of determining first 1, try to achieve characteristic point 2b, the 2c on second 2, the position of 2d, 2e successively.Fig. 4 is connected in turn each characteristic point by straightway, form lens on first plane of incidence first 1 cross sectional shape and second 2 cross sectional shape.Fig. 5 is connected in turn each characteristic point by curved segments, form lens on first plane of incidence first 1 cross sectional shape and second 2 cross sectional shape.
Previous embodiment all is that to get marginal point a be initial illuminated point, determines the position of each characteristic point one by one.Certainly, can another marginal point e be initial illuminated point also, the pairing incident ray of this e is the light along optical axis direction, then from the initiation feature point 1e of correspondence, determines each characteristic point position one by one.
Again being that the plane of the optical axis L of the arm of angle 22 of γ 2 and light source 3 is second plane of incidence by angle, the light-emitting zone that adopts as hereinbefore method light source 3 to be positioned at a side of optical axis L is divided into four little angles according to luminous intensity with the regularity of distribution of lighting angle, and makes the luminous flux that is distributed in the light each little angle in equal.To be positioned at the arm of angle 22 on second plane of incidence is divided into and four little angles, four segments one to one.Adopt method as hereinbefore, try to achieve lens on second plane of incidence first cross sectional shape and second cross sectional shape.By that analogy, being that the plane of the optical axis L of the arm of angle 33 of γ 3 and light source 3 is the 3rd plane of incidence by angle, the light-emitting zone that adopts as hereinbefore method light source 3 to be positioned at a side of optical axis L is divided into four little angles according to luminous intensity with the regularity of distribution of lighting angle, and makes the luminous flux that is distributed in the light each little angle in equal.To be positioned at the arm of angle 33 on the 3rd plane of incidence is divided into and four little angles, four segments one to one.Adopt method as hereinbefore, try to achieve lens first cross sectional shape and second cross sectional shape on the 3rd plane of incidence.If n gets other values, according to the method described above, obtain n the plane of incidence, try to achieve lens first cross sectional shape and second cross sectional shape on this n plane of incidence successively.
Lens cross section on above-mentioned each plane of incidence of trying to achieve is successively rotated in this angular region respectively around optical axis L, and its anglec of rotation equates with the angle of this angular region, tries to achieve 1/8th shapes of lens thus.Shown in Figure 6 is according to lens cross section shown in Figure 5 lens shape schematic diagram in optical axis rotates the territory, eighth that forms.
Territory, the eighth shape of lens shown in Figure 6 according to the center symmetry principle, is obtained the overall structure of lens shown in Figure 7.Fig. 8 is the front view of these lens, and Fig. 9 is the bottom installed surface view of these lens, and wherein light source 3 is installed in the lens base recess 30.
Figure 10 is the actual test hot spot figure of the lens shown in Figure 7 that method for designing obtains according to the present invention, and Figure 11 is its actual test illumination figure.As seen from the figure, the hot spot square that has been near the mark very much, uniformity of illuminance also can reach 0.9.If the n value is big more, the hot spot square that is near the mark more.If but light source is when adopting LED, because the size of lens is less in the restriction of processing technology level and actual the use, general lens diameter is less than 30mm, and at this moment the value of n is unsuitable excessive, because can exert an influence to the uniformity of illumination.Therefore, in the actual design, the value of general n can be taken into account light spot shape and illuminance uniformity so simultaneously for more than or equal to 2 smaller or equal to 10, makes its more realistic instructions for use.
Claims (4)
1. the lens design method of a square uniform light spots, optical axis is through spot center and perpendicular to plane, hot spot place, design procedure is as follows:
A), square hot spot is divided into the centrosymmetric zone that eight angles are 45 degree along its symmetry axis, get the object of one of them zone as the design, this zone is divided into the individual angular region of n (n 〉=2), and the length difference of two arms of angle of each angular region is equated.
B), get a unidirectional arm of angle of each angular region respectively, plane with this arm of angle of mistake and optical axis is the plane of incidence, on this plane of incidence, the light-emitting zone that light source is positioned at a side of optical axis is divided into a plurality of little angles according to luminous intensity with the regularity of distribution of lighting angle, and the luminous flux that is distributed in each little angle is equated;
C), the arm of angle on described each plane of incidence is divided into a plurality of segments, described segment is corresponding one by one with described little angle, and the length of adjusting each segment is inversely proportional to itself and the light source square distance of illuminated point to this segment, is directly proportional with illumination; Shone segment with edge segment in the described segment as initial, with marginal point is initial illuminated point, a promptly corresponding described little angle, leave the required distance of light source according to lens first face, getting on the incident ray corresponding a bit as the initiation feature point on first on the lens with initial illuminated point, at this some place, the straight line that is parallel to light source and initial illuminated point line forms an angle with incident ray, initial deflection of light angle for lens, according to predetermined ratio, described deflection angle is divided into first deflection angle and second deflection angle, the angle separated time as incident ray through the fringence behind first on the lens, by the law of refraction and the little angle of described correspondence, obtain second characteristic point adjacent with initiation feature point, second illuminated point that this second characteristic point is corresponding adjacent with initial illuminated point according to above-mentioned identical step, is obtained the position of each characteristic point on pairing first of each illuminated point successively; On the fringence behind the initiation feature point on passing through described first, to ask for a bit as the initiation feature point on second on the lens according to lens thickness, adopt and the identical method of characteristic point of trying to achieve on first, try to achieve the position of each characteristic point on second; With described first with second on each characteristic point be connected successively, form lens first cross sectional shape and second cross sectional shape on each plane of incidence respectively;
D), the lens cross section on above-mentioned each plane of incidence of trying to achieve is successively rotated in this angular region respectively around optical axis, its anglec of rotation equates with the angle of this angular region, tries to achieve 1/8th shapes of lens thus; According to the center law of symmetry, and then try to achieve the global shape of lens.
2. the lens design method of square uniform light spots according to claim 1, it is characterized in that: described each characteristic point couples together with straight line or smoothed curve successively.
3. the lens design method of square uniform light spots according to claim 1 is characterized in that: when light source is LED, and lens diameter is during less than 30mm, described angular region quantity n≤10.
4. the lens design method of square uniform light spots according to claim 1 is characterized in that: it is transparent material between 1.3 4.2 that described lens adopt refractive index.
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| CN 201010204040 CN102287754B (en) | 2010-06-18 | 2010-06-18 | Method for designing lens with uniform square light spot |
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| CN 201010204040 CN102287754B (en) | 2010-06-18 | 2010-06-18 | Method for designing lens with uniform square light spot |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943993A (en) * | 2012-11-23 | 2013-02-27 | 上海三思电子工程有限公司 | Lens designing method of rectangular irradiation light spot |
| CN104964247A (en) * | 2015-06-16 | 2015-10-07 | 郭萌 | Optical lens |
| CN105953175A (en) * | 2016-06-20 | 2016-09-21 | 杭州光锥科技有限公司 | Projection lamp lens, light-emitting module with projection lamp lens and projection lamp |
| CN108008568A (en) * | 2017-08-16 | 2018-05-08 | 深圳市华星光电技术有限公司 | Lens, backlight module and liquid crystal display |
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| CN101251650A (en) * | 2008-03-21 | 2008-08-27 | 清华大学 | LED three-dimensional optical system design method and optical system with given luminous intensity distribution |
| CN101482652A (en) * | 2009-02-12 | 2009-07-15 | 复旦大学 | Light distribution lens design method aiming at point light source |
| CN102193193A (en) * | 2010-03-11 | 2011-09-21 | 上海三思电子工程有限公司 | Method for designing lens having disc-shaped uniformly illuminating faculae |
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2010
- 2010-06-18 CN CN 201010204040 patent/CN102287754B/en active Active
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| CN101482652A (en) * | 2009-02-12 | 2009-07-15 | 复旦大学 | Light distribution lens design method aiming at point light source |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943993A (en) * | 2012-11-23 | 2013-02-27 | 上海三思电子工程有限公司 | Lens designing method of rectangular irradiation light spot |
| CN102943993B (en) * | 2012-11-23 | 2016-12-21 | 上海三思电子工程有限公司 | A kind of lens design method of rectangular illumination hot spot |
| CN104964247A (en) * | 2015-06-16 | 2015-10-07 | 郭萌 | Optical lens |
| CN104964247B (en) * | 2015-06-16 | 2017-11-24 | 郭萌 | A kind of optical lens |
| CN105953175A (en) * | 2016-06-20 | 2016-09-21 | 杭州光锥科技有限公司 | Projection lamp lens, light-emitting module with projection lamp lens and projection lamp |
| CN108008568A (en) * | 2017-08-16 | 2018-05-08 | 深圳市华星光电技术有限公司 | Lens, backlight module and liquid crystal display |
| CN108008568B (en) * | 2017-08-16 | 2020-05-05 | 深圳市华星光电技术有限公司 | Lens, backlight module and liquid crystal display device |
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Effective date of registration: 20191107 Address after: 201100 Shanghai city Minhang District Shuying Road No. 1280 Co-patentee after: Shanghai Sansi Technology Co.,Ltd. Patentee after: SHANGHAI SANSI ELECTRONIC ENGINEERING Co.,Ltd. Co-patentee after: JIASHAN SANSI OPTOELECTRONIC TECHNOLOGY Co.,Ltd. Co-patentee after: PUJIANG SANSI PHOTOELECTRIC TECHNOLOGY Co.,Ltd. Address before: 201100 Shanghai city Minhang District Shuying Road No. 1280 Co-patentee before: Shanghai Sansi Technology Co.,Ltd. Patentee before: SHANGHAI SANSI ELECTRONIC ENGINEERING Co.,Ltd. Co-patentee before: JIASHAN SANSI OPTOELECTRONIC TECHNOLOGY Co.,Ltd. Co-patentee before: SANSI OPTOELECTRONICS TECHNOLOGY (SHANGHAI) Co.,Ltd. Co-patentee before: PUJIANG SANSI PHOTOELECTRIC TECHNOLOGY Co.,Ltd. |
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