We present a novel freeform lens design method for an application to LED collimating illumination. The method is derived from a basic geometric-optics analysis and construction approach. By using this method, a compact collimated lenses with Aspect Ratio = 0.219 is presented. Moreover, the utility efficiency (UE) inside the angle defined by ideal concentrator hypothesis with different lens-to-LED size ratios for both this lens and TIR lens are presented. A prototype of the collimator lens is also made to verify the practical performance of the lens, which has light distribution very compatible with the simulation results.

Date Published: 17 October 2017
PDF: 21 pages
Proc. SPIE 10379, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XIV, 103790G (17 October 2017); doi: 10.1117/12.2273526

Published in SPIE Proceedings Vol. 10379:
Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XIV
Roland Winston; Sarah R. Kurtz, Editor(s)