| 摘要 |
<p>A retroreflective sheet structure (40) is disclosed that has cube corner retroreflective elements (41). The structure includes a first array (42) of retroreflective elements (41) oriented in a first direction within a plane and a second array (44) of retroreflective elements oriented in a second direction within the plane, wherein said second direction being about 90° to said first direction. The structure further includes a third array (46) of retroreflective elements oriented in a third direction within the plane, wherein said third direction being about 180° to said first direction and a fourth array (48) of retroreflective elements oriented in a fourth direction being about 270° to said first direction. In one embodiment, the retroreflective structure includes the retroreflective elements having cube corner elements having a pitch between elements in the range of between about 0.0035 and 0.0045 inches (0.088 and 0.114 millimeters). In a preferred embodiment,the retroreflective structure includes a metalized layer on the facet side of the retroreflective elements for specular reflection, and the retroreflective elements are tilted by about -3 degrees.</p> |
