National Changhua University of Education Institutional Repository : Item 987654321/10850
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题名: Freeform Surface Design for a Light-Emitting-Diode-Based Collimating Lens
作者: Chen, Jin-Jia;Lin, Chin-Tang
贡献者: 電機工程學系
关键词: Collimating lens;Freeform surface;Light-emitting diode;Total internal reflection surface
日期: 2010-09
上传时间: 2012-06-04T08:35:32Z
出版者: SPIE
摘要: A freeform collimating lens is designed to project light rays emitted from an LED light source to a far target plane. Generally, the
projection distance is assumed to be more than 100 m, and the light beam to have negligible divergence. The lens consists of a total internal
reflection TIR side surface, a spherical surface in the rear, a vertical plane surface in the outer part of the front, and a freeform refractive
surface in the central part of the front. Light rays emitted from the LED source with large spread angles hit the TIR surface and are redirected
parallel to the light axis, and those having small spread angles will be collimated by the freeform refractive surface, which is designed with a
simple approximation method, and then travel parallel to the light axis. Computer simulation results show that an optical efficiency of 81.5% is
achieved under a view angle of �5 deg and for a 1 mm 1 mm LED source.
關聯: Optical Engineering, 49(9): 093001
显示于类别:[電機工程學系] 期刊論文

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