High efficiency optical devices
Assignee3MInnovative Properties Company
InventorsAndrew J. Ouderkirk, Michael F. Weber, Sanford Cobb JR., David L. Wortman
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Abstract
Optical devices according to the present invention include a multilayer optical film in which at least one of the layers comprises an oriented birefringent polymer. The multilayer optical film exhibits low absorptivity and can reflect light approaching at shallow angles as well as normal to the film.
Claims20
An optical device comprising opposing optical surfaces arranged to form a wedge, at least a portion of the opposing optical surfaces comprising a multilayer optical film that comprises alternating layers of at least two materials, and further wherein at least one of the materials has a stress induced birefringence.
An optical device comprising opposing optical surfaces arranged to form a light pipe, at least a portion of the opposing optical surfaces comprising a multilayer optical film that comprises alternating layers of at least two materials, and further wherein at least one of the materials has a stress induced birefringence.
Dependencies are inferred from the claim text.