High efficiency prism light guide with confocal parabolic cross section
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United States of America Patent
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Feb 3, 1998
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N/A
app pub date -
Oct 12, 1995
filing date -
Oct 12, 1995
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Abstract
A hollow light guide with opposed first and second parallel sections having confocal, parabolic cross-sectional shape. The light guide may be a prism light guide, or other hollow light guide such as a metallic mirror light guide or a multi-layer dielectric light guide. The cross-sectional shapes have vertices separated by a distance which does not exceed about three times (preferably, about 2.5 times) the focal length of the shapes.
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