Package for Side Emitting LED
A wide angle light-deflected lens combining collimation and total internal reflection (TIR) optical mechanics for LED package is proposed. Utilizing angle-dividing method the angle of emitting distribution of LED chip was cut into several angular zones and then a light-collimating curve surface with corresponding declined plane performing TIR for the collimated incident ray was designed. Thereby, the light-deflected lens, consisting of multi pairs of collimating curve surfaces and declined planes, can achieve wide-angle deflection of light emitting from LED chip. The design rule and experiment results of the lens with optimization optical design are demonstrated and discussed in this paper.
Guo Fan JIN, Wing Bun LEE, Chi Fai CHEUNG and Suet TO
Y. N. Pao et al., "Package for Side Emitting LED", Key Engineering Materials, Vols. 364-366, pp. 148-151, 2008