CN108954227B - Lens assembly capable of changing light spot size - Google Patents
Lens assembly capable of changing light spot size Download PDFInfo
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- CN108954227B CN108954227B CN201810946907.5A CN201810946907A CN108954227B CN 108954227 B CN108954227 B CN 108954227B CN 201810946907 A CN201810946907 A CN 201810946907A CN 108954227 B CN108954227 B CN 108954227B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/04—Refractors for light sources of lens shape
- F21V5/045—Refractors for light sources of lens shape the lens having discontinuous faces, e.g. Fresnel lenses
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/008—Combination of two or more successive refractors along an optical axis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
The invention relates to a lens assembly capable of changing the size of a light spot, which comprises a lens A and a lens B, wherein one surface of the lens A is a plane, the other surface of the lens A is a convex surface, the lens B is a concave surface, the other surface of the lens B is a plane, and the convex surface of the lens A and the concave surface of the lens B have the same curved surface. Compared with the prior art, the lens component has a small position adjusting range; achieving 100% light collection efficiency under any size spot; the consistent light shape can be realized under different light spots. Meanwhile, the design of the sheet-type optical lens is attractive and elegant, materials used for the lens are greatly reduced, and the cost is lower.
Description
Technical Field
The invention relates to a light spot changing system such as an LED (light emitting diode), in particular to a lens assembly capable of changing the size of a light spot.
Background
In order to meet the requirements of illumination applications, secondary optics are generally used to control the light emitted by the LED at various angles so as to realize uniform illumination or directional illumination, and in some important illumination fields, since the object to be illuminated has a certain size, in order to better highlight the object to be illuminated, the light emitted by the lamp is often required to be controlled within a certain angle range. The angle of the emergent light of the lamp on the market is generally a fixed angle, such as narrow-angle light distribution, medium-angle light distribution and wide-angle light distribution. However, in practical application, the illuminated objects are various, the size difference is relatively large, and the distance between the lamp and the illuminated object is also completely the same due to the installation condition. The use of one or more fixed angle light distribution does not meet the needs of this diversified application well. In order to solve the problem in the industry, an optical lens using a single lens is proposed in the market, the size of a light spot is changed by adjusting the distance between the single lens and a light-emitting LED, and the closer the distance between the single lens and the LED is, the larger the light spot becomes; conversely, the farther the single lens is from the LED, the smaller the spot becomes. This way of adjusting the spot size has some drawbacks:
1. in order to obtain obvious light spot change, the distance between the lens and the LED needs to be changed to be relatively large, and the distance is often more than 20 mm. This is detrimental to the compact design of the luminaire.
2. Since the size of the lens is fixed. The luminous flux collected by the lens and emitted by the LED becomes lower in collection efficiency as the distance between the lens and the LED becomes longer, and thus the system light efficiency becomes lower. The energy saving is not facilitated, and the green illumination represented by the LEDs is rare.
3. The method for changing the light spot of the lamp by changing the relative positions of the single lens and the LED also has the advantages that the light shape difference obtained under different positions is very large, so that the illumination quality is unstable, and in actual use, the illumination styles of the single storefront are not uniform, and the final illumination effect is affected.
Disclosure of Invention
The present invention has been made to overcome the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide a lens assembly with a changeable spot size, which can effectively solve the above-mentioned three problems by means of an accurate optical design. Not only the position adjusting range is small; achieving 100% light collection efficiency under any size spot; the consistent light shape can be realized under different light spots. Meanwhile, the design of the sheet-type optical lens is attractive and elegant, materials used for the lens are greatly reduced, and the cost is lower.
The aim of the invention can be achieved by the following technical scheme: the lens component capable of changing the size of the light spot is characterized by comprising a lens A and a lens B, wherein one surface of the lens A is a plane, the other surface of the lens A is a convex surface, the lens B is a concave surface, the other surface of the lens B is a plane, and the convex surface of the lens A and the concave surface of the lens B are provided with the same curved surface.
The lens A is assembled on the light-emitting surface of the lamp, the plane of the lens A is attached to the light-emitting surface of the lamp, and the convex surface of the lens A is attached to the concave surface of the lens B.
The adjustment of the size of the light spot is realized by adjusting the distance between the lens A and the lens B.
When the two lenses are completely attached, the changed angle is minimum, and the light spots are equivalent to those of the original lamp; as the distance between the two lenses becomes larger, the light spots of the lamp become larger as well; when the distance between the two lenses increases to the set distance, the spot no longer becomes larger and the spot no longer becomes larger as the distance becomes larger.
The set distance is d, and d is defined as: when light is converged by the lens A to generate a converging focus, the lens B is moved to enable the effective outer edge of the concave surface of the lens B to coincide with the converging focus, and the distance between the vertex of the concave surface of the lens B and the vertex of the convex surface of the lens A is the maximum distance between the two lenses.
The set distance d is determined by calculation according to the following formula:
d＝xmax/tan(θmax)+|zmax-z0|
Wherein x max is the lens width corresponding to the outermost edge ray; the emergent light angle corresponding to the ray at the outermost edge of θmax; z max is the z-axis coordinate of the outermost edge ray corresponding to the lens; z 0 is the z-axis coordinate z 0 corresponding to the center of the lens.
The curved surfaces of the lens A and the lens B are determined through calculation according to the following formula:
θi＝a1x4+a2x3+a3x2+a4x1+b
wherein: θi is the included angle between the ith light ray and the horizontal line after passing through the lens A;
a1, a2, a3, a4, b are coefficients;
x is the normalized effective lens width, which refers to the width that controls the light, and the width is normalized and has a value range of (0, 1).
The curved surface value ranges of the lens A and the lens B are as follows: the curve equation corresponding to the lower limit C and the upper limit D respectively takes the normalized x as the abscissa and the angle of the emergent light as the ordinate is as follows:
The respective coefficients (a 1, a2, a3, a4, b) of the lower limit C are given as: (-0.4229, -0.3895, -0.1696, -9.4054, -0.0003), the angles corresponding to the outgoing light of each ray are:
θCi＝-0.4229x4-0.3895x3-0.1696x2-9.4054x-0.0003；
The respective coefficients (a 1, a2, a3, a4, b) of the upper limit D are given the values: (17.315-78.684, 132.56-106.05,0.081) and the angles corresponding to the emergent light of each ray are as follows:
θDi＝17.315x4-78.684x3+132.56x2-106.05x+0.081。
the lens assembly is an assembly formed by at least one pair of lenses A and B, or an array lens flat plate formed by arranging a plurality of lenses A and B in an array.
The array lens flat plate is a gyrosome or a stretching body,
A plurality of lenses A in the same array lens are orderly or unordered, and each lens A is matched with a corresponding lens B;
The curved surface units of a plurality of lenses A in the same array lens are the same or different, and each lens A is matched with the corresponding lens B.
Each lens in the array lens can be arranged according to the requirement, and the array lens is cut according to the shape and size requirement of the assembled lamp.
Compared with the prior art, the invention has the following advantages:
1. The lens group can realize the change of the light distribution angle by only changing the relative position of a few millimeters, thereby being beneficial to shortening the volume of the lamp, saving materials and reducing the cost of the lamp.
2. The lens group capable of changing the size of the light spots always keeps the light collection efficiency of 99% in the process of changing the light distribution angle, so that the light cost waste is avoided basically, and the energy is saved.
3. The lens group capable of changing the size of the light spot always keeps consistent light of the light distribution in the process of changing the light distribution angle. The consistency of the light quality under different light distribution is ensured.
4. The lens group capable of changing the size of the light spot is not limited by the light emitting area of the lamp, the original light emitting angle of the lamp, the structural positioning and other factors, can change the size of the light spot of the lamp, can be applied to any spot lamp, has good universality and does not need to customize a certain lamp. The development time of the lamp is shortened, and the cost investment for lamp development is saved.
5. The lens group can be made into a flat plate structure, which can be made thinner and more attractive compared with the lens proposal on the market.
6. The invention can realize the size change of circular light spots and elliptical light spots.
7. The invention can realize a special-shaped appearance structure very easily through simple cutting. The special-shaped lamp can meet the design requirements of special-shaped lamps and meets the personalized lamp design requirements.
8. The lens material is optical plastic or glass of the lens.
Drawings
FIG. 1 is a schematic view of a structure of a light beam passing through a lens A;
FIG. 2 is a schematic view of the structure of a light ray passing through the lens B;
FIG. 3 is a schematic view of a structure in which lens A and lens B are bonded together;
FIG. 4 is a schematic diagram of the structure of the changing spots of the lens A and the lens B;
FIG. 5 is a schematic view of the structure of lens A and lens B at maximum spacing;
FIG. 6 is a schematic diagram of the maximum separation calculation of lens A and lens B;
FIG. 7 is a schematic diagram of a lens A curved surface design;
FIG. 8 is a schematic diagram of the surface design selectable range of lens A according to the curve equation;
FIG. 9 is a graph showing the curve equation of lens A in example 1;
FIG. 10 is a schematic diagram showing a structure of an array lens A obtained from a plurality of lens A arrays;
FIG. 11 is a side view of the array lens A of FIG. 9;
FIG. 12 is a schematic diagram showing a structure of an array lens B obtained from a plurality of lens B arrays;
FIG. 13 is a side view of the array lens B of FIG. 9;
FIG. 14 is a schematic diagram of an original lamp and its light distribution angles, wherein a is the original lamp and b is the schematic diagram of the formulation angles;
fig. 15 is a schematic structural diagram of an original lamp combined with a lens array a and a lens array B and a distance d=0 between the two, and a schematic structural diagram of the original lamp combined with the lens array B and a schematic structural diagram of a formula angle;
Fig. 16 is a schematic structural diagram of an original lamp combined with a lens array a and a lens array B and a distance d=0.5 therebetween, and a schematic structural diagram of the original lamp combined with the lens array B, and B a schematic structural diagram of a formulation angle;
fig. 17 is a schematic structural diagram of an original lamp combined with a lens array a and a lens array B and a distance d=1.9 therebetween, and a schematic structural diagram of the original lamp combined with the lens array B, and B a schematic structural diagram of a formulation angle;
fig. 18 is a graph showing a relationship between a light distribution angle and a gap between lens groups;
Fig. 19 is a schematic diagram of a structure of a stretched array lens, a being a stretched array lens a, b being a stretched array lens b;
fig. 20 is a schematic diagram of a gyratory structural array lens, a is a gyratory structural array lens a, and b is a gyratory structural array lens b.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples.
Example 1
A lens assembly capable of changing the size of a light spot comprises a lens A1 and a lens B2, wherein one surface of the lens A1 is a plane, the other surface is a convex surface, and the convex surface is a specially designed free-form surface; the lens B2 has a concave surface and a plane surface, the concave surface is a free-form surface which is specially designed, the free-form surface is identical to the free-form surface of the lens A1, and the difference is that the lens A1 has a convex structure and the lens B2 has a concave structure.
The free-form surface lenses of the two lenses are in one-to-one correspondence with one convex structure and one concave structure, and can be completely attached.
In actual use, the plane of lens A1 faces the LED and the concave surface of lens B2 is placed towards the LED. The aim of changing the emergent light distribution angle of the lamp is achieved by changing the distance between the two lenses. The two lenses are completely attached, and the emergent light angle of the lamp is not increased; however, as the distance between the two is increased, the emergent light distribution angle of the lamp is increased, which is opposite to the scheme of a single lens on the market. The specific working process is as follows:
As shown in fig. 1, the light propagates from left to right, but after passing through the lens A1, the light is converged.
As shown in fig. 2, the light propagates from left to right, but after passing through the lens B2, the light diverges.
The curved surfaces of the lens A1 and the lens B2 are identical, so that the angle at which the lens A1 converges is equal to the angle at which the lens B2 diverges.
As shown in fig. 3, when the two lenses are attached together, the angle at which the lens A1 converges is equal to the angle at which the lens B2 diverges, so the angle of the outgoing light of the light is not changed.
As shown in fig. 4, when the two lenses are separated, since the angle at which the lens A1 converges is not equal to the angle at which the lens B2 diverges, the light emission angle becomes larger, and as the distance between the two lenses increases, the light emission angle increases.
As shown in fig. 5, the distance between the lens A1 and the lens B2 is defined as d: when light is converged by the lens A1 to generate a converged focal point, the lens B2 is moved to enable the effective outer edge of the concave surface of the lens B2 to coincide with the converged focal point, and the distance between the vertex of the concave surface of the lens B2 and the vertex of the convex surface of the lens A1 is the maximum distance between the two lenses.
The maximum distance of separation of the lens A1 from the lens B2, i.e., the set distance d, is determined by calculation using the following equation:
d＝xmax/tan(θmax)+|zmax-z0|
Wherein x max is the lens width corresponding to the outermost edge ray; the emergent light angle corresponding to the ray at the outermost edge of θmax; z max is the z-axis coordinate of the outermost edge ray corresponding to the lens; z 0 is the z-axis coordinate z 0 corresponding to the center of the lens.
As shown in fig. 6, the design of the curved surfaces of the lens A1 and the lens B2
There is a parallel light beam which is arranged at equal intervals in the X direction, each light beam of the parallel light beam enters the lens a through the plane of the lens a, then exits through the curved surface, and refracts on both surfaces according to fresnel refraction law. The lens is a curved surface of the lens for precisely controlling the light emergent direction. The exit angle θi of each ray and the corresponding incident position height rayi of each ray are given by the following formulas.
θi＝a1x4+a2x3+a3x2+a4x1+b
Wherein: θi is the included angle between the ith light ray and the horizontal line after passing through the lens A;
a1, a2, a3, a4, b are coefficients;
x is the normalized effective lens width, which refers to the width that controls the light, and the width is normalized and has a value range of (0, 1).
The curved surface value ranges of the lens A and the lens B are as follows: the abscissa with the normalized x as the coordinate, the ordinate with the angle of the outgoing light (according to the mathematical coordinate system, we define the angle of the light propagating from top left to bottom right as the negative number) and the lower and upper limits C and D correspond to the following curve equations respectively:
The respective coefficients (a 1, a2, a3, a4, b) of the lower limit C are given as: (-0.4229, -0.3895, -0.1696, -9.4054, -0.0003), the angles corresponding to the outgoing light of each ray are:
θCi＝-0.4229x4-0.3895x3-0.1696x2-9.4054x-0.0003；
The respective coefficients (a 1, a2, a3, a4, b) of the upper limit D are given the values: (17.315-78.684, 132.56-106.05,0.081) and the angles corresponding to the emergent light of each ray are as follows:
θDi＝17.315x4-78.684x3+132.56x2-106.05x+0.081。
the curved surfaces of the lens A1 and the lens B2 are designed according to the above-mentioned curve equation, and as shown in fig. 7, the area covered by the three lines of the lower limit C, the upper limit D, and the upper limit E is the curved surface selectable area of the lens A1 and the lens B2 according to the present invention.
The lens assembly may be a rotating body symmetrical about an axis, or may be a stretched lens which is stretched to control only one direction. When in operation, a group of two single lenses can be used for operation, or the single lenses can be used as units of an array to be changed into two array lenses to be combined for operation.
In this embodiment, the lens assembly is used as an array lens unit, and the working optical material of the two array lens units is PMMA, and the angle of light diffusion is in the range of 0 to 40 degrees. The maximum exit angle is 40/2=20 degrees.
The formula of the emergent angle thetai of the light after being refracted by the lens A1 is as follows
θi＝-6.1932x4+12.958x3+2.2286x2-28.621x+0.0051，
It can be seen from fig. 8 that this equation plot falls within the region of CDE composition depicted in fig. 7.
The pitch of the lens array units is set to 1.2mm, and each unit is arranged in a hexagonal shape. In order to simplify the design of the curved surface of the lens, 10 light rays distributed at intervals are selected for calculation. The results of the calculations according to the formulas are shown in table 1 below:
Table 1:
The angles of the emergent rays corresponding to the ten rays can be obtained through calculation. According to the known incident angle and the corresponding emergent angle of the light rays, the corresponding points (shown in the following table 2) of the curved surface of the lens can be calculated according to a refractive index formula (shown in the following table), the points are connected by using a free curve to obtain a spline curve of the curved surface, and the spline curve rotates around a central axis to obtain the curved surface of the lens.
n1sinθ1＝n2sinθ2
N1 is the refractive index of the incident light, and θ1 is the incident angle; n2 is the refractive index of the emergent light, and θ2 is the emergent angle
Table 2:
The angles of the emergent rays corresponding to the ten rays can be obtained through calculation. According to the known incident angle and the corresponding emergent angle of the light rays, the corresponding points (shown in the following table 3) of the curved surface of the lens can be calculated according to a refractive index formula (shown in the following table), the points are connected by using a free curve to obtain a spline curve of the curved surface, and the spline curve rotates around a central axis to obtain the curved surface of the lens.
n1sinθ1＝n2sinθ2
N1 is the refractive index of the incident light, and θ1 is the incident angle; n2 is the refractive index of the emergent light, and θ2 is the emergent angle
Table 3:
The lens A is constructed by taking the lens curved surface as the curved surface of the convex lens, and a plurality of lenses A are distributed according to a hexagon, and the array lens A3 is obtained by array at a distance of 1.2 mm. As shown in fig. 9 to 10.
The lens B is constructed by taking the lens curved surface as the curved surface of the concave lens, and a plurality of lenses B are distributed according to a hexagon, and the array lens B4 is obtained by array at a distance of 1.2 mm. As shown in fig. 11 to 12.
The maximum separation distance d between lens a and lens B is calculated:
d＝xmax/tan(θmax)+zmax-z0＝0.6/tan20+1-0.773＝1.9mm
Illumination simulation results:
The original lamp has a light distribution angle of 15 degrees, and the original lamp and the light distribution angle schematic diagram thereof, wherein fig. 14a is the original lamp, and fig. 14b is the formula angle schematic diagram;
The lens assembly of the present invention is mounted on the light emitting surface of the original lamp, the array lens A3 composed of a plurality of lenses a is opposite to the array lens B4 composed of a plurality of lenses B, the array lens A3 is mounted inside, and the array lens B4 is mounted outside, as shown in fig. 15 a. The distance d=0 between the two, i.e. the lenses a and B are completely bonded, with no air gap therebetween. At this time, the light distribution angle is still 15 degrees without change, and as shown in fig. 15b, the light collection efficiency is 99%;
increasing the distance d=0.5m between the array lens A3 and the array lens B4, at which time the light distribution becomes wider, the angle thereof is 20.8 degrees, and the light collection efficiency is 99% as shown in fig. 16a to 16B;
Increasing the distance d=1.9m between the array lens A3 and the array lens B4, at which time the light distribution becomes wider, with an angle of 48 degrees, as shown in fig. 17a to 17B, the light collection efficiency is 99%;
By adjusting the size of the gap between the lens a and the lens B, the relationship between the light distribution angle and the gap of the lens group can be obtained as shown in fig. 18.
Example 2
As shown in fig. 19, a lens a was made into a stretched structure, and a plurality of lenses a of the stretched structure were arranged in parallel to form a stretched array lens a, as shown in fig. 19a, a lens B was made into a stretched structure, and a plurality of lenses B of the stretched structure were arranged in parallel to form a stretched array B, as shown in fig. 19B, and the rest was the same as in example 1.
Example 3
As shown in fig. 20, the lens a is made into a convolution structure, and a plurality of convolution lenses a are arranged in a concentric circle structure to form a stretched array lens a, as shown in fig. 20a, the lens B is made into a convolution structure, and a plurality of convolution lenses B are arranged in a concentric circle structure to form a stretched array lens B, as shown in fig. 20B, and the rest is the same as in example 1.
Claims (6)
1. The lens assembly capable of changing the size of the light spot is characterized by comprising a lens A and a lens B, wherein one surface of the lens A is a plane, the other surface of the lens A is a convex surface, the lens B is a concave surface, the other surface of the lens B is a plane, and the convex surface of the lens A and the concave surface of the lens B have the same curved surface;
the lens A is assembled on the light-emitting surface of the lamp, the plane of the lens A is attached to the light-emitting surface of the lamp, and the convex surface of the lens A is attached to the concave surface of the lens B;
the adjustment of the size of the light spot is realized by adjusting the distance between the lens A and the lens B;
When the two lenses are completely attached, the changed angle is minimum, and the light spots are equivalent to those of the original lamp; as the distance between the two lenses becomes larger, the light spots of the lamp become larger as well; when the distance between the two lenses is increased to the set distance, the light spots are not increased any more, and the light spots are not increased along with the increase of the distance;
The set distance is d, and d is defined as: when light rays are converged by the lens A to generate a converging focus, the lens B is moved to enable the effective outer edge of the concave surface of the lens B to coincide with the converging focus, and the distance between the vertex of the concave surface of the lens B and the vertex of the convex surface of the lens A is the maximum distance between the two lenses;
the set distance d is determined by calculation according to the following formula:
d=xmax/tan(θmax)
Wherein x max is the lens width corresponding to the outermost edge ray; the emergent light angle corresponding to the ray at the outermost edge of θmax;
The curved surfaces of the lens A and the lens B are determined through calculation according to the following formula:
θi = a1x4 + a2x3 + a3x2 + a4x1+ b
wherein: θi is the included angle between the ith light ray and the horizontal line after passing through the lens A;
a1, a2, a3, a4, b are coefficients;
x is the normalized effective lens width, the effective lens width refers to the width which controls the light, the width is normalized, and the value range is (0, 1);
The curved surface value ranges of the lens A and the lens B are as follows: the curve equation corresponding to the lower limit C and the upper limit D respectively takes the normalized x as the abscissa and the angle of the emergent light as the ordinate is as follows:
The respective coefficients (a 1, a2, a3, a4, b) of the lower limit C are given as: (-0.4229, -0.3895, -0.1696, -9.4054, -0.0003), the angles corresponding to the outgoing light of each ray are:
θCi = -0.4229x4 - 0.3895x3 - 0.1696x2 - 9.4054x - 0.0003；
the respective coefficients (a 1, a2, a3, a4, b) of the upper limit D are given the values: (17.315-78.684, 132.56-106.05,0.081) and the angles corresponding to the emergent light of each ray are as follows:
θDi = 17.315x4 - 78.684x3 + 132.56x2 - 106.05x + 0.081。
2. a variable spot size lens assembly according to claim 1 wherein the lens assembly is an assembly of at least one pair of lenses a and B or an array lens plate of a plurality of lenses a and B arranged in an array.
3. A variable spot size lens assembly according to claim 2 wherein the array lens panel is a rotator or stretcher.
4. A variable spot size lens assembly according to claim 2 or claim 3 wherein a plurality of lenses a in the same array of lenses are arranged in order or in order, each lens a matching a corresponding lens B.
5. A variable spot size lens assembly according to claim 2 or claim 3 wherein the curved surface elements of a plurality of lenses a in the same array of lenses are the same or different, each lens a matching a corresponding lens B.
6. A variable spot size lens assembly according to claim 2 or claim 3 wherein the lenses of the array are arranged as required and the array is trimmed according to the size and shape of the assembled lamp.
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| CN201810946907.5A CN108954227B (en) | 2018-08-20 | 2018-08-20 | Lens assembly capable of changing light spot size |
| PCT/CN2019/072826 WO2020037950A1 (en) | 2018-08-20 | 2019-01-23 | Lens assembly capable of changing size of light spot |
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| CN108954227B (en) * | 2018-08-20 | 2024-10-25 | 上海彩丞新材料科技有限公司 | Lens assembly capable of changing light spot size |
| CN114167528A (en) * | 2021-12-29 | 2022-03-11 | 合肥瑞识智能科技有限公司 | Refractive lens and design method thereof |
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| DE202007008430U1 (en) * | 2007-06-15 | 2008-10-16 | Heise, Sebastian | lighting device |
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| CN108954227B (en) * | 2018-08-20 | 2024-10-25 | 上海彩丞新材料科技有限公司 | Lens assembly capable of changing light spot size |
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| CN207539833U (en) * | 2017-10-09 | 2018-06-26 | 广州市焦汇光电科技有限公司 | A kind of focusing lens |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN108954227A (en) | 2018-12-07 |
| WO2020037950A1 (en) | 2020-02-27 |
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