Design method of secondary optical element for LED applications

Yi-Yung Chen; Allen Jong-Woei Whang

doi:10.1117/12.824867

21 August 2009 Design method of secondary optical element for LED applications

Yi-Yung Chen, Allen Jong-Woei Whang

Proceedings Volume 7428, Current Developments in Lens Design and Optical Engineering X; 74280E (2009) https://doi.org/10.1117/12.824867
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

Light Emitting Diode, LED, has many advantages in many lighting applications, such as general illumination, street light, and auto lamp. In general, each application needs to do secondary optical design for its specific request. A secondary optical element can be separated into refractive and reflective part. In this paper, we present a design procedure of secondary optical design with intensity distribution of LED and sequential ray tracing. The method suits the both designs of refractive and reflective parts. In the first process, we integrate the series function of intensity distribution in spherical coordinate with a range of solid angle. In the second process, we calculate the redistribution parameters of luminous flux by the geometric parameters of LED, element, and detector. In the final process, we use ray tracing method to design the optical element by aspheric surface. The surface of the refractive part in secondary optical element could be Fresnel surface for reducing the thickness of element. For proving the design procedure, we design a secondary optical element of LED by this method with an illumination request.

Citation Download Citation

Yi-Yung Chen and Allen Jong-Woei Whang "Design method of secondary optical element for LED applications", Proc. SPIE 7428, Current Developments in Lens Design and Optical Engineering X, 74280E (21 August 2009); https://doi.org/10.1117/12.824867

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