CN119310660B - Aspheric lens for collimation flat top of external middle-round LED (light-emitting diode) area light source - Google Patents
Aspheric lens for collimation flat top of external middle-round LED (light-emitting diode) area light source Download PDFInfo
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Abstract
本发明属于光学元件技术领域，具体涉及一种用于外方中圆LED面光源准直平顶的非球面透镜，能将发光面发出的波长为0.85μm、发散角在±40°内光强为朗伯分布的LED出射光束经非球面透镜后，整形为在观测面处发散角在±2°内的准直平顶光束；发光面形状外方中圆，其圆形区域不发光，发光面的边长为200μm×200μm、圆形区域直径90μm，非球面透镜的前表面为平面、后表面为非球面，其面型用最高次为8次的偶次非球面方程表示。本发明能够将LED光发射面发出的朗伯体光束进行高效整形，使其变为准直平顶光束，能够显著提升光学系统的工作效能与精度。
The present invention belongs to the technical field of optical elements, and specifically relates to an aspheric lens for collimating flat tops of square-in-circle LED surface light sources, which can shape the LED outgoing light beam with a wavelength of 0.85 μm and a divergence angle within ±40° and a light intensity of Lambertian distribution emitted from the light-emitting surface into a collimated flat top beam with a divergence angle within ±2° at the observation surface after passing through the aspheric lens; the shape of the light-emitting surface is square-in-circle, and its circular area does not emit light. The side length of the light-emitting surface is 200 μm×200 μm, and the diameter of the circular area is 90 μm. The front surface of the aspheric lens is a plane, and the rear surface is an aspheric surface. Its surface shape is represented by an even-order aspheric surface equation with a highest order of 8. The present invention can efficiently shape the Lambertian beam emitted from the LED light-emitting surface into a collimated flat top beam, which can significantly improve the working efficiency and accuracy of the optical system.
Description
Technical Field
The invention belongs to the technical field of optical elements, and particularly relates to an aspheric lens for an external middle-circular LED (light-emitting diode) area light source collimation flat top.
Background
Flat-top beams with uniform distribution of light intensity in cross-section are favored in many applications such as microscope system illumination, optical communications, optical sensing, and optical measurement. In the field of microscope systems, the flat-top beam can build a uniform illumination environment, the resolution and imaging quality of a microscope are improved, so that an observed sample is clearer and the details are more abundant, in the field of optical communication, the flat-top beam can widen the bandwidth of optical fiber transmission and extend the transmission distance of signals, and in the fields of optical sensing and optical measurement, the flat-top beam plays an important role in improving the sensitivity and the precision of a sensor and enhancing the measurement stability and the accuracy. Along with the continuous development of technology, the application field of flat-top beams is expanded and deepened continuously, and more convenience and benefits are brought to the production and life of human beings.
However, the light intensity of the light emitted by the LED light source is approximately lambertian, and the characteristic is that the light intensity gradually decreases from the center to the edge, and the divergence angle is quite wide, so that the LED light source is difficult to directly meet the severe requirements of various high-end applications on the light beam. Secondary light distribution design is often required for the LED light source to meet the above application requirements.
Among the many methods of converting LED light sources into flat-top beams, optical shaping systems are more common, including optical filter shaping systems, birefringent lens group shaping systems, freeform lens shaping systems, freeform fresnel hyperbolic lens shaping systems, and aspheric lens group shaping systems that cover inverse lambertian absorption. In these existing lens types, there are limitations to different degrees, either the volume itself is large or the requirements for process preparation are high, and the requirements for small volume and low preparation cost cannot be simultaneously achieved. For example, part of the lenses have complex structures and precise designs, so that the lenses are huge and bulkier, are difficult to spread in some application scenes with strict space requirements, and the other parts of the lenses have extremely high challenges on the precision, equipment and process steps of the manufacturing process due to special curved surface shapes and process requirements, so that the preparation process is complex and complicated, and the production cost is greatly increased.
Among the above shaping systems, the aspherical lens group shaping system has the advantages of simple structure, high shaping efficiency, easy implementation and the like, and has wide prospects in the engineering application field. The aspherical lens group shaping system can be composed of a single lens, has the characteristics of compact structure and low cost, and can also be composed of two or more lenses, and the complex and accurate beam shaping function is realized through parameter cooperation among the lenses. Zeng Dan et al designed a single lens and a lens array based on a point light source by utilizing an optical expansion conservation theory, realized annular light spot distribution conforming to the design standard of the round island road illumination, rengmao Wu et al designed a free-form surface lens based on a point light source, realized illuminance distribution of bright and dark multiple rings, chieh-Jen Cheng et al designed a single lens with aspheric surfaces on both sides based on a square surface light source, and realized collimation and uniform distribution on the cross section of a light beam.
Chinese patent CN106199782a discloses a single aspherical lens for laser gaussian beam shaping, the single aspherical lens sequentially comprises a front lens surface and a rear lens surface from a beam input side, the front lens surface is aspherical, the rear surface is plane, the side surface is cylindrical, the front lens surface protrudes to the beam output side, and the lens is made of SK2 optical glass. The patent can shape the red light beam with Gaussian distribution, so that the emergent light beam is changed into a flat-top light beam, but cannot process the light beam with lambertian distribution of the light intensity distribution emitted by the LED light source.
Disclosure of Invention
The invention aims to solve the technical problem of providing an aspheric lens for an external middle-circular LED (light-emitting diode) area light source collimation flat top, which can be used for efficiently shaping a lambertian body light beam emitted by an LED area light source to be changed into a collimation flat top light beam, and is a plane aspheric shaping lens capable of collimating and changing uneven light intensity distribution into even light intensity distribution.
In order to solve the problems, the invention adopts the following technical scheme:
An aspheric lens for collimation flat-top of external middle round LED surface light source can make LED emergent beam with wavelength of 0.85 μm and divergence angle within + -40 deg. and light intensity of lambertian distribution pass through the aspheric lens, then make shaping into collimation flat-top beam with divergence angle within + -2 deg. at observation surface, the external middle round of luminous surface is non-luminous, its side length of luminous surface is 200 μm x 200 μm, diameter of circular area is 90 μm, front surface of aspheric lens is plane, rear surface is aspheric, its surface form is represented by the maximum 8 times even aspheric equation:
x is an axial value along the direction of the optical axis with the intersection point of the aspheric surface and the optical axis as a starting point; C=1/R, wherein R is the radius of curvature of the center of the mirror surface, C is the curvature of the center of the mirror surface, h is the vertical height of a point on the mirror surface, y and z are coordinates in a plane perpendicular to the optical axis; Is the higher order term coefficient in the aspheric equation, The coefficient values are shown in the list:
the distance between the front surface vertex and the rear surface vertex, i.e., the aspherical lens center thickness, was 2.6±0.07mm.
Further, the rear surface of the aspherical lens is convex.
Further, the aspherical lens edge is circumferentially provided with a side surface.
Further, the side surface shape is provided in a cylindrical surface shape, and the side surface diameter is 4.07.+ -. 0.05mm.
Further, the distance between the light emitting surface and the vertex of the front surface of the aspherical lens is 2.031.+ -. 0.1mm.
Further, the observation surface is 5.0 to 10.0mm from the top point of the rear surface of the aspherical lens.
Further, the light transmission aperture of the front surface is 3.0+ -0.05 mm.
Further, the light transmission aperture of the rear surface is 4.07.+ -. 0.05mm.
Further, the material of the aspherical lens is L-BAL35P glass.
Further, the refractive index of the L-BAL35P glass for a light beam having a wavelength of 0.85 μm was 1.582.
The aspherical lens sequentially comprises a front surface and a rear surface from a light beam incidence direction to a light beam emergence direction, wherein the front surface is a plane, and the rear surface is a convex even aspherical surface, namely a plano-convex plane aspherical lens.
Compared with the prior art, the invention has the beneficial effects that:
1 the invention has a specific luminous surface, wherein the luminous surface is shaped like an outer middle circle, the round area does not emit light, the outer side length is 200 mu m multiplied by 200 mu m, and the diameter of the round area is 90 mu m;
2 the invention has a specific light emitting range that the divergence angle is within +/-40 degrees to emit light beams from the LEDs;
The invention has specific light intensity distribution that the light intensity of the LED light beam is lambertian distribution, and the emergent light beam is shaped into a flat-top light beam which is collimated and has uniform light intensity in the cross section of the light beam by adopting a single aspheric lens;
The invention has simple structure and is beneficial to processing, the single aspheric lens is simple to assemble, the structural size is small, the plano-convex structure of the lens is beneficial to processing, the shaping lens can shape the LED emergent beam into a beam with uniform light intensity distribution and uniformity of 10 percent and approximately collimated divergence angle +/-2 degrees.
Uniformity is defined as
Wherein Imax and IMINVALLEY are the maximum light intensity and the minimum light intensity of the flat top region respectively;
in conclusion, the invention realizes the efficient shaping of the lambertian body light beam with the divergence angle within the range of +/-40 degrees, converts the lambertian body light beam into the collimated flat-top light beam with the uniform light intensity distribution and the divergence angle within the range of +/-2 degrees, can remarkably improve the working efficiency and precision of an optical system, has a simple structure, facilitates the mechanical positioning and stable installation of the aspherical lens in the optical system, ensures the better light transmission performance of the aspherical lens, and is favorable for large-scale production and popularization.
Drawings
FIG. 1 is a schematic view of an aspherical lens according to the present invention;
FIG. 2 is a schematic diagram showing the installation of an aspherical lens according to the present invention;
FIG. 3 is a schematic view of the structure of the light emitting surface of the present invention;
FIG. 4 is a two-dimensional simulation of the structure and path of an aspherical lens simulated by Zemax software in accordance with the present invention;
FIG. 5 is a three-dimensional simulation of the structure and path of an aspherical lens simulated by Zemax software in accordance with the present invention;
FIG. 6 is a schematic representation of the simulated light intensity distribution of the present invention at an observation plane 5mm from the apex of the rear surface;
FIG. 7 is a schematic representation of the simulated light intensity distribution of the present invention at an observation plane 10mm from the apex of the rear surface;
FIG. 8 is a trace of a luminous point in the present invention;
In the figure:
1. Light emitting surface, 2, aspheric lens, 21, front surface, 22, back surface, 23, side surface, 3, TO cap, 4, TO package center line, 5, TO seat, 6, observation surface.
Detailed Description
The present invention is specifically described and illustrated below with reference to examples.
Example 1
The aspheric lens for the collimation flat top of the external middle-circular LED area light source can be assembled into a TO packaging assembly. As shown in fig. 1, the TO package assembly includes a TO cap 3 and a TO socket 5, the TO cap 3 for packaging and supporting the aspherical lens 2 disposed therein, the TO socket 5 providing a mounting infrastructure for the TO cap 3 and for accommodating and protecting the light emitting face 1. The light emitting face 1, the aspherical lens 2, and the TO package center line 4 of the TO cap 3 are aligned, the TO cap 3 supports the aspherical lens 2, and the aspherical lens 2 is packaged in the TO cap 3 as shown in fig. 1. The center of the optical axis of the light emitting surface 1, the vertex of the front surface 21 and the vertex of the rear surface 22 are all located on the TO package center line 4 of the TO package assembly.
As noted above, the TO package assemblies shown in fig. 1 and 2 are provided as examples only, and other optical module packages are possible.
The aspherical lens 2 for the TO packaging component emits light beams of LEDs with the center wavelength of 0.85 mu m and the light intensity distribution obeying the lambertian distribution aiming at the light emitting surface 1. As shown in fig. 3, the light emitting surface 1 is shaped as an outer middle circle, the circular area does not emit light, the side length of the light emitting surface 1 is 200 μm×200 μm, and the diameter of the circular area is 90 μm. The divergence angle of the LED emergent beam is +/-90 degrees, and the aspheric lens 2 can shape the LED emergent beam with the divergence angle within +/-40 degrees into a quasi-straight flat-top beam.
Fig. 4 is a two-dimensional optical path obtained by substituting relevant Data of the present invention into corresponding positions of Lens Data Editor in Zemax software. As shown in fig. 4, the LED light beam emitted from the light emitting surface 1 is directed to the observation surface 6 via the aspherical lens 2, the distance between the light emitting surface 1 and the front surface 21 of the aspherical lens 2 along the optical axis is 2.031±0.1mm, and the distance between the vertex of the rear surface 22 of the aspherical lens 2 and the observation surface 6 along the optical axis is 5.0 to 10.0mm.
As shown in fig. 4, the aspherical lens 2 is a front surface 21 and a rear surface 22 in this order from the light emitting surface 1 to the observation surface 6, wherein the x-axis is the optical axis of the aspherical lens 2, and the front surface 21 and the rear surface 22 are rotationally symmetrical about the x-axis.
The aspherical lens 2 was made of L-BAL35P glass, and the refractive index of the L-BAL35P glass was 1.582 for a light beam having a wavelength of 0.85. Mu.m.
The distance between the vertex of the front surface 21 and the vertex of the rear surface 22 of the aspherical lens 2 is 2.6 plus or minus 0.07mm, the light transmission caliber of the front surface 21 is 3.0 plus or minus 0.05mm, the light transmission caliber of the rear surface 22 is 4.07 plus or minus 0.05mm, the edge of the aspherical lens 2 is circumferentially provided with a side surface 23, the shape of the side surface 23 is cylindrical, and the diameter of the side surface 23 is 4.07 plus or minus 0.05mm.
As shown in fig. 4, the front surface 21 of the aspherical lens 2 is a plane, the rear surface 22 is an aspherical surface, and the surface shape thereof is represented by an even aspherical equation of 8 times at the highest order:
x is an axial value along the direction of the optical axis with the intersection point of the aspheric surface and the optical axis as a starting point; C=1/R, wherein R is the radius of curvature of the center of the mirror surface, C is the curvature of the center of the mirror surface, h is the vertical height of a point on the mirror surface, y and z are coordinates in a plane perpendicular to the optical axis; Is the higher order term coefficient in the aspheric equation, The numerical values are shown in the list:
The invention realizes the efficient shaping of the LED emergent beam with the divergence angle within +/-40 degrees, which is emitted by the luminous surface 1, so that the LED emergent beam is converted into the collimation flat-top beam with the divergence angle within +/-2 degrees, the working efficiency and the precision of an optical system can be obviously improved, the structure of the aspherical lens 2 is simple, the mechanical positioning and the stable installation of the aspherical lens 2 in the optical system are convenient, the better light transmission performance of the aspherical lens 2 is ensured, and the large-scale production and the popularization are facilitated.
Fig. 5 is a three-dimensional optical path obtained by substituting relevant Data of the present invention into corresponding positions of Lens Data Editor in Zemax software. Fig. 5 shows the propagation path and the change condition of the light path of the LED outgoing beam with the divergence angle of ±40° emitted from the light emitting surface 1 after passing through the aspherical lens 2, and reflects the action process of the aspherical lens 2 on the LED outgoing beam.
Fig. 6 is a schematic diagram of the simulated light intensity distribution of the present invention at the observation surface 6 at 5mm from the apex of the rear surface 22, with the ordinate of fig. 6 being the relative illuminance RI. As shown in fig. 6, by tracing up to 2843696 rays, a spot circular area with a radius of 2.0526mm is obtained at the observation surface 6, which is 5mm from the apex of the rear surface 22. As can be seen from fig. 6, the light intensity distribution of the light spot shows a uniform state, which indicates that the aspheric lens 2 can effectively shape the LED outgoing beam emitted from the light emitting surface 1 into a collimated flat-top beam with relatively uniform light intensity under an observation distance of 5 mm. The luminous point trace is shown in fig. 8.
Fig. 7 is a schematic diagram of the simulated light intensity distribution of the present invention at the observation surface 6 at 10mm from the apex of the rear surface 22, and the ordinate in fig. 7 is the relative illuminance RI. As shown in fig. 7, by tracing up to 2843696 rays, a spot circular area with a radius 2.1059 is obtained at the observation surface 610 mm from the apex of the rear surface 22. As can be seen from fig. 6, the light intensity of the small area in the center of the light spot is slightly concave, but the light intensity of the rest of the large area is uniformly distributed. The luminous point trace is shown in fig. 8.
Based on the change data of the light spot radius in fig. 6 and 7, the divergence angle of the collimated flat-top beam after being shaped by the aspheric lens 2 can be calculated as follows:
The divergence angle value is smaller than +/-2 degrees, which proves the reliability of the invention.
Claims (10)
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| CN202411868734.1A CN119310660B (en) | 2024-12-18 | 2024-12-18 | Aspheric lens for collimation flat top of external middle-round LED (light-emitting diode) area light source |
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| CN202411868734.1A CN119310660B (en) | 2024-12-18 | 2024-12-18 | Aspheric lens for collimation flat top of external middle-round LED (light-emitting diode) area light source |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106168712A (en) * | 2016-09-06 | 2016-11-30 | 山东理工大学 | A kind of Gaussian Beam Transformation is the population method for designing of flat top beam shaping lens |
| CN107783285A (en) * | 2017-11-06 | 2018-03-09 | 山东理工大学 | Correct the ant colony optimization method of single non-spherical lens spherical aberration |
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| EP1469252A3 (en) * | 2000-03-31 | 2005-08-31 | Seiko Epson Corporation | Light source device, and illuminating optical system and projector including the same |
| JP3960295B2 (en) * | 2003-10-31 | 2007-08-15 | 住友電気工業株式会社 | Aspheric homogenizer with reduced tilt error |
| CN112764138B (en) * | 2021-02-21 | 2022-04-29 | 淄博丰雁电子元件有限公司 | TO aspheric lens with high coupling efficiency |
| CN113466976A (en) * | 2021-06-28 | 2021-10-01 | 中国人民解放军战略支援部队信息工程大学 | Single aspheric lens for converting Gaussian beam into flat-topped beam |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106168712A (en) * | 2016-09-06 | 2016-11-30 | 山东理工大学 | A kind of Gaussian Beam Transformation is the population method for designing of flat top beam shaping lens |
| CN107783285A (en) * | 2017-11-06 | 2018-03-09 | 山东理工大学 | Correct the ant colony optimization method of single non-spherical lens spherical aberration |
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