第18卷
第10期
2010年10月
文章编号
1004-924X(2010)10-2123-07
光学精密工程
Optics and Precision Engineering
Vol.18No.10
Oct.2010
微型投影机自由曲面LED聚光器的设计
赵星，吴宏超，宋丽培，方志良
（南开大学现代光学研究所教育部光电信息技术与科学重点实验室，天津300071)
折射和反射自由曲面的LED聚光器。采用非成像理论和同时多表面设计方法，计算并获得了聚光器折射和反射两个自由曲面在子午裁面内的各点坐标，利用聚光器的旋转对称性得到了其在三维空间内的面形数据。设计结果的光学建模仿真分析表明，所得聚光器能够有效地收集大功率LED光源的能量，并将光束发散角控制在12°内，其光能收集率达到71%。与采用反射式聚光器的设计方案相比，光能收集率提高了20%，而体积则下降了70%，有效地提高了光学引肇的效率和紧
漆性。本项设计对LED微型投影仪的小型化具有指导和借鉴作用。关键调：LED聚光器；自由曲面；微型投影机
中图分类号：TH741.5：TN312.8
文献标识码：A
doi;10.3788/OPE.20101810.2123
DesignoffreeformLEDconcentratorformicro-projector
ZHAO Xing，WU Hong-chao,SONG Li-pei,FANG Zhi-liang
(Instituteof ModernOptics,KeyLaboratory ofOpto-electronic Information Scienceand
Technology,MinistryofEducation,NankaiUniversity,Tianjin300o7l,China)
Abstract: The structure and working principle of a freeform LED concentrator were researched and a compact LED concentrator with refractive and reflective freeform surfaces for the micro-projector was designed to im-prove the concentration efficiency and to compress the volume, Based on non-imaging optics and the method of simultaneous multi-surfaces, the curves of freeform surfaces in the meridian planes were calculated, then the 3D structure of the concentrator was obtained by rotating the curves along Z axis. The simulation result con firms that the concentrator can collect the energy from high power LED sources effectively with a collection ef-ficiency of 71% and can control the divergence angle within 12°. Compared with conventional reflective ones, this new concentrator increases the collection efficiency by 20% and compresses the volume by 70%. The de-
sign can provide a reference for the microminiaturization of LED micro-projectors. Key words;LED concentrator; freeform surface; micro-projector
低廉等优点，作为新型固体光源，特别是微型投影
1
引
LED具有体积小、功耗低、寿命长以及价格收稿日期：2010-03-09；修订日期：2010-04-05.
机的新型光源近年来受到世人的广泛关注1-6]。然而相比传统的弧光灯投影光源，LED的亮度低，光束发散角大，对微型投影机光学引擎的效率
基金项目：光电信息技术科学教育部重点实验室开放课题资助项目(No.2007KFKT029)；中央高校基本科研业务费
专项资金资助项目