Light redirecting films including non-interlockable optical elements
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United States of America Patent
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Apr 29, 2008
Grant Date -
Jun 9, 2005
app pub date -
Sep 30, 2004
filing date -
Feb 23, 1999
priority date (Note) -
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Abstract
The light redirecting films include a thin optically transparent substrate having a pattern of non-interlocking individual optical elements oriented and placed to produce a desired surface coverage of at least one of the surfaces of the transparent substrate of the transparent substrate occupied by the optical elements. At least some of the optical elements may have at least one flat surface and at least one curved surface that may intersect each other to a greater extent on the curved surface than on the flat surface to increase the relative percentage of flat surface area to curved surface area of the intersecting optical elements to increase the on axis gain of light passing through the film.
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