Multi-orientation retroreflective structure
US6877866B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 19, 2002 |
| Grant date | Apr 12, 2005 |
| Priority date | — |
| Expiry date | Aug 19, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/124
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A retroreflective structure is disclosed that has cube corner retroreflective elements. The structure includes a first array of retroreflective elements oriented in a first direction within a plane and a second array 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 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 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.