| 摘要 |
A depressed triangular array contains a non-retroreflecting region and a retroreflecting region both of which have a planimetrically identical hexagon unit structure (non-retroreflecting unit, retroreflecting unit). When the non-retroreflecting units are removed from the depressed triangular array, the resulting array has a retroreflecting units S and void portions. A retroreflector of the present invention is produced by placing the retroreflecting units S in these void portions. Therefore, the retroreflector has a surface made up of closely packed retroreflecting units S. In other words, the whole surface area of the retroreflector is constituted of the retroreflecting units S, making the whole plane function as a retroreflecting region. Because of this structure, the retroreflector has a significantly high retroreflectance. |
