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Optical System Design

Better reading light system with light-emitting diodes using optimized Fresnel lens

[+] Author Affiliations
Wen-Gong Chen

I-Shou University, Department of Electronic Engineering, Kaohsiung 840, Taiwan

Chii-Maw Uang

I-Shou University, Department of Electronic Engineering, Kaohsiung 840, Taiwan

Opt. Eng. 45(6), 063001 (June 28, 2006). doi:10.1117/1.2210472
History: Received May 27, 2005; Revised October 21, 2005; Accepted November 23, 2005; Published June 28, 2006
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The main function of a Fresnel lens is to provide light guidance. Since the current LED sources cannot provide enough flux for reading lamps to be designed with a single LED, instead systems must use multiple LEDs. We present an optimal design of a Fresnel lens for a reading light system with multiple light sources of white light LEDs. The groove angles of the Fresnel lens are chosen as design parameters and the design goal is to maximize the illuminance in a specified reading surface while maintaining the distribution uniformity of the light rays. We develop a series of genetic algorithms that are implemented with SCHEME language and macros supported by the commercially available nonimaging optical simulation tool to search for a set of optimal groove angles for the Fresnel lens. From the simulation results we can see that the optimally designed Fresnel lens indeed offers better light-guiding performance than typical Fresnel lenses for a multiple-LED reading light system.

Figures in this Article
© 2006 Society of Photo-Optical Instrumentation Engineers

Citation

Wen-Gong Chen and Chii-Maw Uang
"Better reading light system with light-emitting diodes using optimized Fresnel lens", Opt. Eng. 45(6), 063001 (June 28, 2006). ; http://dx.doi.org/10.1117/1.2210472


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