Miniature micro prism retroreflector
US6206525A · kind A · utility
26Cited by
10References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1997 |
| Grant date | Mar 27, 2001 |
| Priority date | — |
| Expiry date | Dec 1, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/124
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Retroreflective sheeting for forming orientation free cones of reflected light encompassing a 0.5 degree angle of observation is formed of small metal backed cube corner prisms in an array in which the size of the prisms are in a range between 0.0005 inch to 0.003 inches on center. The array is formed by casting transparent plastic prisms in a mold formed by ruling three sets of grooves which intersect at an angle. The grooves are spaced apart in the range of 0.0005 inch to 0.003 inches on center. Before or after formation, the prisms are coated with a reflective material such as a metal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.