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Proceedings Paper

Design method of secondary optical element for LED applications
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Paper 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.

Paper Details

Date Published: 21 August 2009
PDF: 8 pages
Proc. SPIE 7428, Current Developments in Lens Design and Optical Engineering X, 74280E (21 August 2009); doi: 10.1117/12.824867
Show Author Affiliations
Yi-Yung Chen, National Taiwan Univ. of Science and Technology (Taiwan)
Allen Jong-Woei Whang, National Taiwan Univ. of Science and Technology (Taiwan)

Published in SPIE Proceedings Vol. 7428:
Current Developments in Lens Design and Optical Engineering X
Pantazis Z. Mouroulis; R. Barry Johnson; Virendra N. Mahajan, Editor(s)

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