Patent ID: 7366393

Claim:
An optical member comprising an array of total internal reflection structures, said optical member comprising: an optically transmissive material having a surface; a first plurality of non-intersecting elongate features formed in said surface, said first plurality of non-intersecting elongate features oriented at an angle α; a second plurality of non-intersecting elongate features formed in said surface, said second plurality of non-intersecting elongate features oriented at an angle α′, said first plurality of non-intersecting elongate features being oriented at an angle |α-α′| with respect to said second plurality of non-intersecting elongate features, said angle |α-α′| being less than 30°; and a third plurality of non-intersecting elongate features formed in said surface, said third plurality of non-intersecting elongate features oriented at an angle ξ, said second plurality of non-intersecting elongate features being oriented at an angle |α′-ξ| with respect to said third plurality of non-intersecting elongate features, said angle |α′-ξ| being less than 30°, said first plurality of non-intersecting elongate features being oriented at an angle |α-ξ| with respect to said third plurality of non-intersecting elongate features, said angle |α-ξ| being less than 30°, wherein each of said non-intersecting elongate features in said first plurality extends across said non-intersecting elongate features in said second plurality and said non-intersecting elongate features in said third plurality and each of said non-intersecting elongate features in said second plurality extends across said non-intersecting elongate features in third plurality thereby defining said total internal reflection structures.