实现均匀照明的自由曲面反射器

丁毅; 顾培夫

光学学报, 2007, 27 (3): 540, 网络出版: 2007-03-15

实现均匀照明的自由曲面反射器下载： 888次

Freeform Reflector for Uniform Illumination

论文大纲

丁毅 ^*顾培夫

作者单位

浙江大学现代光学仪器国家重点实验室, 杭州 310027

摘要

通过单个自由曲面反射器的反射, 令光源发出的能量重新分布, 在特定照明面上实现所需照明, 从而简化了投影设备中的照明系统, 使设备的进一步小型化成为可能。根据给出的光源辐射特性和所需实现的照明面上的能量分布, 可得到一组偏微分方程, 数值差分求解直接得到自由曲面反射器。光源采用发光面积1 mm×1 mm朗伯体发光的LED, 视角为120°, 照明面为4∶3的均匀矩形光斑。设计了两种自由曲面反射器, 并用软件对得到的曲面进行了照明模拟, 模拟得到的照明均匀性接近90％。两种反射器在光轴方向上的投影尺寸均小于25 mm, 垂直光轴方向上投影长度均小于22 mm, 照明系统总长均小于40 mm, 结构紧凑, 适用于小型LED投影设备。

Abstract

The energy from the source was rearranged through the reflection by a freeform reflector, and the desired illumination on a certain plane was got, which simplified the illumination system in the projectors and provided a choice to minimize the device further. A partial differential equations set was presented according to the character of the light source and the desired energy distribution on the illumination plane. The numerical results of the partial differential equations set were investigated to obtain a freeform reflector. LED with a Lambertian light emitting surface of 1 mm×1 mm and a viewing angle of 120° was applied as the light source, and the desired illumination on certain face was a 4∶3 rectangular. Two kinds of free reflectors were designed, and the simulated results showed a uniform illumination near to 90%. The projection lengths on the optical axis of both free form reflectors are less than 25 mm, and the projection lengths on the axis perpendicular to the optical axis are both less than 22 mm. The total lengths of the illumination system are both less than 40 mm, so this system is very compact and suitable for the portable LED projectors.

参考文献

[1] Kuang Lijuan, Zhai Jinhui, Ruan Yu et al.. Characteristics of fly eye lens in uniform illumination system[J]. Optics & Optoelectronic Technology, 2005, 3(6): 29～31(in Chinese)
匡丽娟, 翟金会, 阮玉等. 复眼透镜阵列应用于均匀照明系统的特性研究[J]. 光学与光电技术, 2005, 3(6)： 29～31

[2] Yang Bo, Wang Yongtian. Computer aided design of free form reflector[J]. Acta Optica Sinca, 2004, 24(6): 721～724 (in Chinese)
杨波, 王涌天. 自由曲面反射器的计算机辅助设计[J]. 光学学报, 2004, 24(6)： 721～724

[3] Yang Bo, Liu Yichao, Wang Yongtian. Automatic design and optimization of segmented free form reflector[J]. Acta Photonica Sinca, 2004, 33(8): 970～973 (in Chinese)
杨波, 刘一超, 王涌天. 多曲面反射体的计算机辅助设计及优化[J]. 光子学报, 2004, 33(8)： 970～973

[4] . Tailored freeform optical surfaces[J]. J. Opt. Soc. Am. A, 2002, 19(3): 590-595.

[5] . M. Gordon, Harald Ries. Tailored edge-ray concentrators as ideal second stages for Fresnel reflector[J]. Appl. Opt., 1993, 32(13): 2243-2251.

[6] . Tailored edge-ray reflectors for illuminaiton[J]. J. Opt. Soc. Am. A, 1994, 11(4): 1260-1264.

[7] . Nonimaging reflectors as functionals of the desired irradiance[J]. J. Opt. Soc. Am. A, 1993, 10(9): 1902-1908.

[8] . Formulation of a reflector design problem for a lighting fixture[J]. J. Opt. Soc. Am., 1972, 62: 1498-1501.

[9] Won Yong L, Young Chol Lee, Kirill Sokolov et al.. LED projection displays［C］. Proc. SPIE, 2004, 5529: 1～6

[10] Chen Weiheng. Introduction of Differential Geometry[M]. Beijing: Beijing University Press, 1990. 101～109 (in Chinese)
陈维桓. 微分几何初步[M]. 北京：北京大学出版社, 1990. 101～109

[11] Su Yucheng, Wu Qiguang. Numerical Solutions of Partial Differential Equations[M]. Beijing: Weather Press, 1989. 2～16 (in Chinese)
苏煜城, 吴启光. 偏微分方程数值解法[M]. 北京：气象出版社, 1989. 2～16

丁毅, 顾培夫. 实现均匀照明的自由曲面反射器[J]. 光学学报, 2007, 27(3): 540. 丁毅, 顾培夫. Freeform Reflector for Uniform Illumination[J]. Acta Optica Sinica, 2007, 27(3): 540.

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