Turning film having multiple slopes

Details Turning film having multiple slopes Turning film having multiple slopes

2011-06-07

2011-06-07

Shafer, Ricky D (Department: 2872)

Optical: systems and elements

Prism

With reflecting surface

C359S837000, C362S339000

Reexamination Certificate

active

07957082

ABSTRACT:
The present invention provides a light redirecting article for redirecting light toward a target angle, the light redirecting article comprising: an input surface comprising a plurality of light redirecting structures each light redirecting structure having a near surface having two slopes, sloping away from normal in one direction as defined by a first inclination base angle β1, a second inclination angle β2, and a first half apex angle α2, for accepting incident illumination over a range of incident angles and a far surface sloping away from normal, in the opposite direction relative to the input surface, as defined by a second base angle γ1and a second half apex angle α1. The invention further provides an output surface opposing to the input surface wherein the near and far surfaces are opposed to each other at an angle (α1+α2) that is in the range from 60 to 70 degrees, and the base angle β1is in the range from 82 to 87 degrees.

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