Design of a novel LED collimating element based on freeform surface  

作　　者：闫兴涛 杨建峰 薛彬 张国琦 卜凡 

机构地区：[1]Key Laboratory of Spectral Imaging Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences [2]Graduate School of Chinese Academy of Sciences [3]Xi'an ZKMT Electronic Technology Equipment Co., Ltd

出　　处：《Optoelectronics Letters》2013年第1期9-12,共4页光电子快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.60808028);the National High Technology Research and Development Program (No.2010AA122203)

摘　　要：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.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 calcuhted 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.

关 键 词：自由曲面设计 光学准直 设计元素 LED灯 LED光源 光学模拟 反射器 内表面 

分 类 号：TN312.8[电子电信—物理电子学]