High efficiency optical devices
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United States of America Patent
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Apr 3, 2001
Grant Date -
N/A
app pub date -
Dec 15, 1999
filing date -
Jun 26, 1995
priority date (Note) -
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Abstract
Optical devices such as light pipes which incorporate multilayer optical films in which the refractive indices of two adjacent layers in the thickness direction are substantially matched or are small relative to the difference in refractive indices of said two adjacent layers in an given in-plane direction which is at least 0.05. The multilayer optical film exhibits low absorptivity and can reflect light approaching at shallow angles as well as normal to the film.
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