| 摘要 |
A retroreflective structure has a window side and a facet side. The facet side has a plurality of steps with treads and risers intersecting at an angle. The risers include an array of retroreflective elements. Preferably, the elements are cube-corner prisms. The method includes forming the structure by polymerizing a polymerizable material in a mold having a facet side including a tiered structure having a plurality of steps with treads and risers intersecting at an angle and wherein the risers include an array of retroreflective elements.
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