Smooth Energy Mappings of Freeform Lens Design for Non-circular Distribution of Luminance

Author

Ku-Chin Lin

Author_Institution

Dept. of Mech. Eng., Kun Shan Univ., Tainan, Taiwan

fYear

2013

fDate

10-12 April 2013

Firstpage

150

Lastpage

154

Abstract

Energy mappings of edge rays are required in design of a freeform lens for LED illumination. The mappings dominate the outcome of the lens design and the final distribution of the LED light illumination. Smoothness of the mappings is critical to assure the edge-ray principle hold. Design of energy mappings with good smoothness for circular distribution of uniform luminance is known, but the design for non-circular distribution is not well discussed in the literature yet. In this paper, a design method of smooth energy mappings for rectangular distribution of uniform luminance is proposed. It will be demonstrated by the Monte Carlo ray tracing simulations that the proposed mappings can generate luminance distribution with a clear-cut horizon and a 15° slope.

Keywords

Monte Carlo methods; brightness; lenses; light emitting diodes; optical design techniques; optical engineering computing; ray tracing; LED illumination; LED light illumination; Monte Carlo ray tracing simulation; clear-cut horizon; edge-ray principle; freeform lens design; luminance distribution; noncircular distribution; rectangular distribution; smooth energy mapping; uniform luminance; Lenses; Light emitting diodes; Light sources; Lighting; Optimized production technology; System-on-chip; Freeform Lens Design; Illumination Design; Smooth Energy Mapping;

fLanguage

English

Publisher

ieee

Conference_Titel

Computer Modelling and Simulation (UKSim), 2013 UKSim 15th International Conference on

Conference_Location

Cambridge

Print_ISBN

978-1-4673-6421-8

Type

conf

DOI

10.1109/UKSim.2013.136

Filename

6527407