| 摘要 |
To provide a triangular-pyramidal cube-corner retro-reflective sheeting having a new structure. The triangular-pyramidal cube-corner retroreflective sheeting is constituted so that a pair of triangular-pyramidal cube--corner retroreflective elements partitioned by three lateral faces (faces a1, b1, and c1; faces a2, b2, and c2; ...) 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 the common bottom plane (S-S'), opposite faces (faces c1 and c2) of this pair of triangular-pyramidal retroreflective elements share a base (x), the bottom plane (S-S') is a common plane including bases (z and z) of one-side lateral faces (faces a1 and a2) and bases (y and y) of the other-side lateral faces (faces b1 and b2) of this pair of triangular--pyramidal retroreflective elements, this pair of triangular-pyramidal retroreflective elements have faced lateral faces (faces c1 and c2) having shapes different from each other, and heights from the bottom plane (S-S') up to apexes of the elements are different from each other.
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