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Proceedings Article

Free-form lens design for LED indoor illumination

[+] Author Affiliations
Kuang-Lung Huang

MingDao Univ. (Taiwan)

Jin-Jia Chen, Te-Yuan Wang, Li-Lin Huang

National Changhua Univ. of Education (Taiwan)

Proc. SPIE 7852, LED and Display Technologies, 78521D (November 15, 2010); doi:10.1117/12.870647
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From Conference Volume 7852

  • LED and Display Technologies
  • Gang Yu; Yanbing Hou
  • Beijing, China | October 18, 2010

abstract

This paper presents a free-form lens design for indoor illumination. The lens consists of a TIR (total internal reflection) surface on the sidewall, a refractive surface on the front side, and a concave surface on the rear side. The TIR surface is decorated with a free-form profile that light rays emitted from the LED with a larger spread angle to the axis will experience a total internal refection and output from the front refractive surface. While the central part of the front refractive surface has a convex surface that makes light rays closing to the optical axis more evenly distributed. The purpose of the rear concave surface is to let light rays emitted from the LED enter the lens straightforwardly. With this lens light rays from a Lambertian-type LED light source can be redistributed so that a uniform illumination can be achieved. The optical simulation results show that the measured optical efficiency is 75% while the uniformity is 80% on a target plane of 6-m diameter and at 2.5-m away.

© (2010) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Kuang-Lung Huang ; Jin-Jia Chen ; Te-Yuan Wang and Li-Lin Huang
"Free-form lens design for LED indoor illumination", Proc. SPIE 7852, LED and Display Technologies, 78521D (November 15, 2010); doi:10.1117/12.870647; http://dx.doi.org/10.1117/12.870647


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