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Proceedings Paper

Uniformly illuminating dual-lens system for LED collimation
Author(s): William A. Parkyn; David G. Pelka
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Paper Abstract

We present an efficient and effective collimating lens system for LEDs. It consists of two lenses: an immersive ball lens within which an LED die is optically bonded, and an adjacent collimating lens that produces uniform illumination at its output plane. The three surfaces of the system are numerically tailored in accordance with the angular distribution of light emitted by the die. When the immersion lens is surface-tailored, the resultant shapes are sufficiently close to a spherical surface that the manufacturing convenience and low cost of an exact sphere make it the preferred shape. The immersion ball-lens reduces the angular spread of the LED's light from +/- 90 degrees to +/- 60 degrees in air. The bottom surface of the collimating lens redirects each light ray to its proper place (axial radius) in the output beam, at which point the top surface redirects the ray to become parallel to the optical axis. Uniformity of output illuminance occurs when a ray's proper place is determined by its place in the cumulative angular distribution near the immersed source. Three surfaces suffice to give highly efficient collimation as well as spatial uniformity of the output beam.

Paper Details

Date Published: 19 November 2001
PDF: 7 pages
Proc. SPIE 4446, Nonimaging Optics: Maximum Efficiency Light Transfer VI, (19 November 2001); doi: 10.1117/12.448821
Show Author Affiliations
William A. Parkyn, Teledyne Lighting and Display Products (United States)
David G. Pelka, Teledyne Lighting and Display Products (United States)

Published in SPIE Proceedings Vol. 4446:
Nonimaging Optics: Maximum Efficiency Light Transfer VI
Roland Winston, Editor(s)

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