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Proceedings Paper

Illuminance-mapping linear lenses for LEDs
Author(s): William A. Parkyn; David G. Pelka
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Paper Abstract

Conventional linear light sources irradiate cylindrically, into 360° in a circle orthogonal to the lamp axis. This makes it difficult to optically couple lamp-output to a much narrower range of output directions. Light-emitting diodes, however, emit into a hemisphere or less of solid angle, and thus are much more amenable to proper lensing. Recent LED tape systems have ±60° emission angles, due to recessing the emitting chips in reflector cups. This turns out to be highly beneficial to linear lenses, enabling nearly 100% collection efficiency. Here we present a new class of nonimaging linear lenses with two aspheric profiles, designed according to the amounts of source-light received along longitudinal strips on the interior surface of the linear lens. In the small-source approximation, the light falling on each strip is imaged relatively intact in the far field, although the source itself is not. This enables the design of extruded linear lenses achieving uniform illumination of nearby planar targets, as in shelf and cove lighting.

Paper Details

Date Published: 8 September 2005
PDF: 12 pages
Proc. SPIE 5942, Nonimaging Optics and Efficient Illumination Systems II, 59420L (8 September 2005); doi: 10.1117/12.619139
Show Author Affiliations
William A. Parkyn, Tailored Optics (United States)
David G. Pelka, Tailored Optics (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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