Light redirecting films having optical elements with curved surfaces
First Claim
1. A light redirecting film comprising a thin optically transparent substrate having a light entrance surface for receiving light from a light source and an opposite light exit surface, at least one of the surfaces having a pattern of individual optical elements of well defined shape having at least two curved surfaces, one of the curved surfaces of the optical elements having a different curvature than the other curved surface, the optical elements being quite small relative to the length and width of the substrate to redistribute light passing through the substrate in a predetermined angular distribution.
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Accused Products
Abstract
The light redirecting films have a thin optically transparent substrate having a light entrance surface and an opposite light exit surface, at least one of the surfaces including a pattern of individual optical elements of well defined shape having two differently curved surfaces. The individual optical elements are quite small in size relative to the length and width of the substrate, and redistribute light passing through the substrate in a predetermined angular distribution. The individual optical elements may be distributed on the surface of the substrate such that some intersect each other, or the placement may be randomized.
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Citations
20 Claims
- 1. A light redirecting film comprising a thin optically transparent substrate having a light entrance surface for receiving light from a light source and an opposite light exit surface, at least one of the surfaces having a pattern of individual optical elements of well defined shape having at least two curved surfaces, one of the curved surfaces of the optical elements having a different curvature than the other curved surface, the optical elements being quite small relative to the length and width of the substrate to redistribute light passing through the substrate in a predetermined angular distribution.
- 15. A light redirecting film comprising a thin optically transparent substrate having a light entrance surface for receiving light from a light source and an opposite light exit surface, at least one of the surfaces having a pattern of individual optical elements of well defined shape having at least two curved surfaces, the curved surfaces of at least some of the optical elements being different from the curved surfaces of other of the optical elements, the optical elements being quite small relative to the length and width of the substrate to redistribute light passing through the substrate in a predetermined angular distribution.
Specification