1 September 2010 Freeform surface design for a light-emitting diode-based collimating lens
Author Affiliations +
Optical Engineering, 49(9), 093001 (2010). doi:10.1117/1.3488046
A freeform collimating lens is designed to project light rays emitted from an LED light source to a far target plane. Generally, the projection distance is assumed to be more than 100 m, and the light beam to have negligible divergence. The lens consists of a total internal reflection (TIR) side surface, a spherical surface in the rear, a vertical plane surface in the outer part of the front, and a freeform refractive surface in the central part of the front. Light rays emitted from the LED source with large spread angles hit the TIR surface and are redirected parallel to the light axis, and those having small spread angles will be collimated by the freeform refractive surface, which is designed with a simple approximation method, and then travel parallel to the light axis. Computer simulation results show that an optical efficiency of 81.5% is achieved under a view angle of ±5 deg and for a 1 mm×1 mm LED source.
Jin-Jia Chen, Chin-Tang Lin, "Freeform surface design for a light-emitting diode-based collimating lens," Optical Engineering 49(9), 093001 (1 September 2010). https://doi.org/10.1117/1.3488046

Light emitting diodes

Light sources


3D modeling

Lens design

Optical engineering

Geometrical optics


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