| 摘要 |
PROBLEM TO BE SOLVED: To provide a retroreflection article, having excellent incident angle characteristic, observation angle characteristic, and improved rotation angle characteristic. SOLUTION: This composite retroreflection article includes a triangular pyramid-shaped retroreflection element and a tetrahedral retroreflection element. The article is formed of a first element pair group in which two included angles (α=∠BAC,β=∠ABC) made between a shared base (A-B) of the element pair and the other two bases (B-C, C-A) are different and the paired elements are disposed line symmetrically, and a second element pair group line symmetrical with respect to the vertices (C1, C2) of the base of the paired elements. COPYRIGHT: (C)2009,JPO&INPIT
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