Freeform surface design for a light-emitting diode-based collimating lens

Jin Jia Chen, Chin Tang Lin

Research output: Contribution to journalArticle

65 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number093001
JournalOptical Engineering
Volume49
Issue number9
DOIs
Publication statusPublished - 2010 Sep 1

Fingerprint

Light emitting diodes
Lenses
light emitting diodes
lenses
Light sources
rays
light beams
travel
divergence
light sources
computerized simulation
projection
Computer simulation
approximation

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering(all)

Cite this

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Freeform surface design for a light-emitting diode-based collimating lens. / Chen, Jin Jia; Lin, Chin Tang.

In: Optical Engineering, Vol. 49, No. 9, 093001, 01.09.2010.

Research output: Contribution to journalArticle

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