23 September 2008 Secondary optical design for LED illumination using freeform lens
Author Affiliations +
Abstract
The purpose of the secondary optical design for light emitting diodes (LED) illumination is to rearrange the direct output of LED and then achieve the desired illumination. Usually a lens is applied to realize this function in an LED illumination system, and a freeform lens can do better than the traditional spherical ones. The method in this paper can be used to design a freeform lens in short time, just less than 10 seconds. And this freeform lens is constructed using the numerical solutions of a set of first-order partial differential equations, which are deduced from the Snell's law according to the conservation of energy. Using an LED as the source while immersing it in the lens, a uniform rectangle can be gotten through single refraction, and with uniformity near to 90%. The rectangular illumination also has a relatively clear cut-off line with little blur at the edge. This method can shorten the designing time and improve the performance of LED illumination system. Furthermore, not only rectangle, but other illumination figures can be achieved by freeform lens designed by this method, which can broaden the scope of freeform lens's usage.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yi Ding, Xu Liu, Zhen-rong Zheng, Pei-fu Gu, "Secondary optical design for LED illumination using freeform lens", Proc. SPIE 7103, Illumination Optics, 71030K (23 September 2008); doi: 10.1117/12.797810; https://doi.org/10.1117/12.797810
PROCEEDINGS
8 PAGES


SHARE
RELATED CONTENT

Optical design for uniform color mixing illumination system
Proceedings of SPIE (September 18 2013)
Design of freeform surface lens for LED of random light...
Proceedings of SPIE (August 20 2013)
Solving the wall wash problem with a single lens
Proceedings of SPIE (December 29 2014)
Design of collimating system for LED source
Proceedings of SPIE (December 31 2013)
Study on optical design method for LED extended sources
Proceedings of SPIE (October 06 2010)

Back to Top