High incidence angle retroreflective material
First Claim
1. In a retroreflective material, the combination of a transparent surface layer, a backing layer, and an array of reflecting elements between said layers, each of said reflecting elements having a rectangular base, two mutually perpendicular rectangular faces meeting said base at 45°
- angles, and two parallel triangular faces perpendicular to said rectangular faces, said triangular and rectangular faces defining a pair of cube corners therebetween, said reflecting elements being uniformly arranged with their bases adjacent said surface layer and their cube corners adjacent said backing layer, and wherein opposing triangular faces of adjacent elements are spaced apart to provide internal reflection therefrom.
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Accused Products
Abstract
Retroreflective film, sheeting or the like having an array of light-reflecting right triangle prisms between a transparent surface layer and a backing layer. The opposing triangular end faces of adjacent prisms are spaced apart to provide internal reflection therefrom. The retroreflective material provides efficient retroreflection at angles of incidence of about 30°-85° and therefore is effective where light is directed in a path nearly parallel to a reflective surface, such as highway lane dividers or guardrail markers placed parallel to a highway. Retroreflective material on such markers becomes visible to an observer while yet remote from the markers.
202 Citations
10 Claims
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1. In a retroreflective material, the combination of a transparent surface layer, a backing layer, and an array of reflecting elements between said layers, each of said reflecting elements having a rectangular base, two mutually perpendicular rectangular faces meeting said base at 45°
- angles, and two parallel triangular faces perpendicular to said rectangular faces, said triangular and rectangular faces defining a pair of cube corners therebetween, said reflecting elements being uniformly arranged with their bases adjacent said surface layer and their cube corners adjacent said backing layer, and wherein opposing triangular faces of adjacent elements are spaced apart to provide internal reflection therefrom.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
Specification