| Xing-tao Yan,Jian-feng Yang,Bin Xue,Guo-qi Zhang,Fan Bu.Design of a novel LED collimating element based on freeform surface[J].Optoelectronics Letters,2013,9(1):9-12 |
| Design of a novel LED collimating element based on freeform surface |
| Author Name | Affiliation | E-mail | | Xing-tao Yan | Key Laboratory of Spectral Imaging Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an, 710119, China
Graduate School of Chinese Academy of Sciences, Beijing, 100049, China | xingtao.yan@163.com | | Jian-feng Yang | Key Laboratory of Spectral Imaging Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an, 710119, China | | | Bin Xue | Key Laboratory of Spectral Imaging Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an, 710119, China | | | Guo-qi Zhang | Xi’an ZKMT Electronic Technology Equipment Co., Ltd, Xi’an, 710119, China | | | Fan Bu | Key Laboratory of Spectral Imaging Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an, 710119, China
Graduate School of Chinese Academy of Sciences, Beijing, 100049, China | |
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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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