Two-sided corner-cube retroreflectors and methods of manufacturing the same
US7506987B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 29, 2008 |
| Grant date | Mar 24, 2009 |
| Priority date | — |
| Expiry date | Feb 29, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/124
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a retroreflective sheeting, and methods of formation thereof, the sheeting comprises a body of material, the body having a first surface and a second surface. A plurality of first full-square-sided corner-cube structures are on the first surface of the body, the first full-square-sided corner-cube structures each having three facets that lie along planes that are orthogonal to each other. A plurality of second full-square-sided corner-cube structures are on the second surface of the body, the second full-square-sided corner-cube structures each having three facets that lie along planes that are orthogonal to each other. The body is constructed and arranged to be transparent to incident electromagnetic energy at a range of wavelengths and to have a thickness so that an incident electromagnetic energy ray that is incident at one of the first and second surfaces enters the body, and is redirected by both the first surface and the second surface so that both the first surface and the second surface contribute to retroreflection of the incident electromagnetic energy ray, and exits from the one of the first and second surfaces at which the incident electromagnetic energy ray was inci…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.