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Proceedings Paper

Illumination-redistribution lenses for non-circular spots
Author(s): William A. Parkyn; David G. Pelka
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Paper Abstract

The design of illumination lenses is far easier under the regime of the small-source approximation, whereby central rays are taken as representative of the entire source. This implies that the lens is much larger than the source's active emitter, and its entire interior surface is nowhere close to the source. Also, a given source luminance requires a minimum lens area to achieve the candlepower necessary for target illumination. We introduce two-surface aspheric lenses for specific illuminations tasks involving ceiling-mounted downlights, lenses that achieve uniform illuminance at the output aperture as well as at the target. This means that squared-off lenses will produce square spots. In particular, a semicircular lens and a vertical mirror will produce a semicircular spot suitable for gambling tables.

Paper Details

Date Published: 8 September 2005
PDF: 12 pages
Proc. SPIE 5942, Nonimaging Optics and Efficient Illumination Systems II, 594208 (8 September 2005); doi: 10.1117/12.619145
Show Author Affiliations
William A. Parkyn, Tailored Optics, Inc. (United States)
David G. Pelka, Tailored Optics, Inc. (United States)


Published in SPIE Proceedings Vol. 5942:
Nonimaging Optics and Efficient Illumination Systems II
Roland Winston; R. John Koshel, Editor(s)

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