| 摘要 |
Retroreflective film, sheeting or the like having an array of light-reflecting right triangle prisms between a transparent surface layer and a backing layer. The opposing triangular end faces of adjacent prisms are spaced apart to provide internal reflection therefrom. The retroreflective material provides efficient retroreflection at angles of incidence of about 30 DEG -85 DEG and therefore is effective where light is directed in a path nearly parallel to a reflective surface, such as highway lane dividers or guardrail markers placed parallel to a highway. Retroreflective material on such markers becomes visible to an observer while yet remote from the markers. |
