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Design of a novel LED collimating element based on freeform surface

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Abstract

A novel element for collimating LED light is designed based on non-imaging optics. It is composed of a refraction lens and a reflector. The upper surface of the lens is freeform and calculated by geometrical optics and iterative process. The lens makes the rays in the range of 0°-45° from the optical axis collimated. The rays in the range of 45°-90° from the optical axis are collimated by the reflector. The inner surface of the reflector is parabolic with its focus located in the LED chip. The designed element is applicable to LED source of any emitting type. For a certain application, the simulation results of the designed element in Tracepro show that it has a very compact structure and good collimating performance. Just investigating the loss in the lens surfaces, this element has high light output efficiency of nearly 99%. Most lighting area radii are no more than 20 mm when the illuminated plane is 5 m away from the LED source.

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DOI:10.1007/s11801-013-2331-0

基金项目:This work has been supported by the National Natural Science Foundation of China (No.60808028), and the National High Technology Research and Development Program (No.2010AA122203).

收稿日期:2012-08-15

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作者单位    点击查看

YAN Xing-tao:Key Laboratory of Spectral Imaging Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese AcademySciences, Xi’an 710119, China
YANG Jian-feng:Key Laboratory of Spectral Imaging Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy
XUE Bin:Key Laboratory of Spectral Imaging Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy
ZHANG Guo-qi:Graduate School of Chinese Academy of Sciences, Beijing 100049, China
BU Fan:Key Laboratory of Spectral Imaging Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese AcademySciences, Xi’an 710119, China

联系人作者:YAN Xing-tao(xingtao.yan@163.com)

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引用该论文

YAN Xing-tao,YANG Jian-feng,XUE Bin,ZHANG Guo-qi,BU Fan. Design of a novel LED collimating element based on freeform surface[J]. 光电子快报(英文版), 2013, 9(1): 9-12

YAN Xing-tao,YANG Jian-feng,XUE Bin,ZHANG Guo-qi,BU Fan. Design of a novel LED collimating element based on freeform surface[J]. Optoelectronics Letters, 2013, 9(1): 9-12

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