LIGHT REDIRECTING FILMS AND FILM SYSTEMS
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 one flat surface and at least one curved surface and being quite small relative to the length and width of the substrate to redistribute light passing through the substrate in a predetermined angular distribution, wherein at least some of the optical elements intersect each other.
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Accused Products
Abstract
Light redirecting film comprises a thin optically transparent substrate having a pattern of individual optical elements of well defined shape on or in at least one surface that are quite small relative to the length and width of the surface. At least some of the optical elements have at least one flat surface and at least one curved surface and 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.
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Citations
11 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 one flat surface and at least one curved surface and being quite small relative to the length and width of the substrate to redistribute light passing through the substrate in a predetermined angular distribution, wherein at least some of the optical elements intersect each other.
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9. 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 sloping surfaces and being quite small relative to the length and width of the substrate to redistribute light passing through the substrate in a predetermined angular distribution, wherein at least some of the optical elements intersect each other to achieve substantially complete surface coverage of at least one of the surfaces of the substrate within the pattern of optical elements, wherein at least one of the sloping surfaces is flat and at least one other of the sloping surfaces is curved.
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10. 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 and quite small relative to the length and width of the substrate to redistribute light passing through the substrate in a predetermined angular distribution, said optical elements having only two sides or surfaces, one of the sides being flat and the other side being curved, the two sides coming together to form a ridge, said ridge having a flattened, rounded, curved or otherwise misshaped peak, wherein:
R=Radius of curvature of the curved side, D=Peak depth or height of the optical element, θ
=Interior angle of the flat side to the surface of the substrate, andγ
=Width of the flattened, rounded, curved or otherwise misshaped ridge peak when viewed from above and normal to the substrate.- View Dependent Claims (11)
Specification