Open AccessDesign of compact and smooth free-form optical system with uniform illuminance for LED source
Author(s) -
Yi Luo,
Zexin Feng,
Yongqin Han,
Hongtao Li
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.009055
Subject(s) - illuminance , optics , lens (geology) , nonimaging optics , light source , led lamp , point source , computer science , physics
A feedback modification method based on variable separation mapping is proposed in the design of free-form optical system with uniform illuminance for LED source. In this method, the non-negligible size of LED source is taken into account, and a smooth optical system is established with single freeform surface regenerated by adding feedback to the lens design for a point light source. More rounds of feedback can improve the lens performance. As an example, a smooth free-form lens with rectangular illuminance distribution is designed, and the illuminance uniformity is improved from 18.75% to 81.08% after eight times feedback.