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Front. Inform. Technol. Electron. Eng.  2012, Vol. 13 Issue (12): 929-936    DOI: 10.1631/jzus.C12a0116
    
Optimized design of LED freeform lens for uniform circular illumination
Peng Liu, Reng-mao Wu, Zhen-rong Zheng, Hai-feng Li, Xu Liu
State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China
Optimized design of LED freeform lens for uniform circular illumination
Peng Liu, Reng-mao Wu, Zhen-rong Zheng, Hai-feng Li, Xu Liu
State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China
 全文: PDF 
摘要： An optimization method is proposed for designing an LED freeform lens which produces a uniform circular pattern with high energy efficiency. This method is composed of three main aspects: design of the initial guess, parameterization of the freeform surface, and construction of the merit function. The initial guess is created by solving an ordinary differential equation numerically. An approach of selecting optimization points is introduced for parameterization of the freeform surface. The merit function is constructed by use of the irradiance uniformity and the efficiency of the lens. Design examples are given, and the results show that the irradiance distribution is well controlled with a maximum uniformity (the relative standard deviation of irradiance, RSD) of 0.0122 and a maximum efficiency of 93.88%. This optimization method can be generalized to design freeform lenses with different lighting patterns or without rotational symmetry.
关键词： Illumination design;  Lenses;  Light emitting diode (LED);  Non-imaging optics    
Abstract: An optimization method is proposed for designing an LED freeform lens which produces a uniform circular pattern with high energy efficiency. This method is composed of three main aspects: design of the initial guess, parameterization of the freeform surface, and construction of the merit function. The initial guess is created by solving an ordinary differential equation numerically. An approach of selecting optimization points is introduced for parameterization of the freeform surface. The merit function is constructed by use of the irradiance uniformity and the efficiency of the lens. Design examples are given, and the results show that the irradiance distribution is well controlled with a maximum uniformity (the relative standard deviation of irradiance, RSD) of 0.0122 and a maximum efficiency of 93.88%. This optimization method can be generalized to design freeform lenses with different lighting patterns or without rotational symmetry.
Key words: Illumination design    Lenses    Light emitting diode (LED)    Non-imaging optics
收稿日期: 2012-04-27 出版日期: 2012-12-09
CLC:  O43  
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Peng Liu
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Zhen-rong Zheng
Hai-feng Li
Xu Liu

引用本文:

Peng Liu, Reng-mao Wu, Zhen-rong Zheng, Hai-feng Li, Xu Liu. Optimized design of LED freeform lens for uniform circular illumination. Front. Inform. Technol. Electron. Eng., 2012, 13(12): 929-936.

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http://www.zjujournals.com/xueshu/fitee/CN/10.1631/jzus.C12a0116    或    http://www.zjujournals.com/xueshu/fitee/CN/Y2012/V13/I12/929

[1] Reng-mao Wu, Peng Liu, Ya-qin Zhang, Zhen-rong Zheng, Hai-feng Li, Xu Liu. Ray targeting for optimizing smooth freeform surfaces for LED non-rotational illumination[J]. Front. Inform. Technol. Electron. Eng., 2013, 14(10): 785-791.
[2] Hong ZHOU, Hai-er XU, Pei-qi HE, Zhi-bai SONG, Chen-ge GENG. Automatic inspection of LED indicators on automobile meters based on a seeded region growing algorithm[J]. Front. Inform. Technol. Electron. Eng., 2010, 11(3): 199-205.