| 摘要 |
A triangular pyramid cube-corner retroreflection sheet of novel structure. The sheet is characterized in that triangular pyramid reflecting elements are arranged in a closest packed form side by side, adjacent elements share base sides (x) on a first base (imaginary plane X-X'), one inclined face (c-face), of which one of the sides is the base side (x), of each element is triangular, the other incline faces (a-face, b-face) sharing one edge extending from the vertex (H) of the element are rectangular, and the height (h') from the first base (imaginary plane X-X') to the vertex (H) is substantially less than the height (h) from a substantially horizontal second base (Z-Z') including the base sides (z, w) of the other inclined faces (a-face, b-face) to the vertex (H).
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