Patent ID: 6942350

Claim:
A triangular-pyramidal cube-corner retroreflective sheeting wherein a pair of triangular-pyramidal cube-corner retroreflective elements partitioned by three lateral faces (faces a 1 , b 1 , and c 1 ; faces a 2 , b 2 , and c 2 ; . . . ) almost perpendicularly intersecting each other because V-shaped grooves having substantially-symmetric cross sections intersect each other are arranged in a closest-packed state so as to protrude to one side on a common bottom plane (S-S′), faced lateral faces (faces c 1 and c 2 ) of this pair of triangular-pyramidal retroreflective elements are paired by sharing a base (x), the bottom plane (S-S′) is a common plane including bases (z and z) of one-side faces (faces a 1 and a 2 ) and the bases(y and y) of the other-side faces (faces b 1 and b 2 ) of this pair of triangular-pyramidal retroreflective elements, this pair of triangular-pyramidal retroreflective elements sharing the base (x) have opposite faces (faces c 1 and c 2 ) with shapes different from each other, and heights from the bottom plane (Sx-Sx′) up to apexes of the elements are different from each other, wherein the triangular-pyramidal cube-corner reflective elements are included in which an angle (θ) formed between the optical axis (t 1 ) and a vertical line passing through apexes (H 1 and H 2 ) of the elements tilts in a plus (+) direction or minus (−) direction so that the angle (θ) is in a range of 0.6 to 1.5°.