Patent ID: 6877866
Filing Date: 2005-04-12
Classification: G02B

Abstract:
1. A retroreflective structure comprising arrays of retroreflective cube-corner elements having a pitch between elements in the range of between about 0.0025 and 0.0055 inches, a first array of retroreflective cube-corner elements being oriented in a first direction within a plane, a second array of retroreflective cube-corner elements being oriented in a second direction being about 90° to said first direction, a third array of retroreflective cube-corner elements oriented in a third direction within the plane, wherein said third direction being about 180° to said first direction, and a fourth array of retroreflective cube-corner elements oriented in a fourth direction being about 270° to said first direction, each array extending the length of one side of the retroreflective structure, wherein said cube-corner elements are tilted at about −3°.