| 摘要 |
The invention provides a thin, flexible retroreflective sheeting formed from a substantially optically transparent material. The sheeting comprises a substrate having a base surface disposed in a base plane; a structured surface opposite the base surface that contains at least one array of canted cube corner element matched pairs formed by three intersecting sets of substantially parallel grooves including a primary groove set, and two sets of secondary grooves, each matched pair including a first canted cube corner element and a second canted cube corner element disposed opposite a primary groove from the first element, wherein (a) opposing cube corner elements in a given array have their symmetry axes canted in a first plane and through a predetermined cant angle measuring between 4 DEG and 15 DEG from an axis extending normally from the base; (b) the sheeting of this given array exhibits its broadest range of entrance angularity in a second plane angularly displaced from the first plane, and in a third plane, angularly displaced from the first plane; and substantially each of the cube corner element arrays is oriented such that either the second or third plane is approximately parallel with an edge of the sheeting. <IMAGE> |
