Cube corner type retroreflection article
US8201953B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 6, 2007 |
| Grant date | Jun 19, 2012 |
| Priority date | — |
| Expiry date | Aug 23, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/124
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A retroreflection article formed of groups of grooves in three directions having substantially V-shaped cross sections, including a large number of pairs of cube corner retroreflection elements being disposed, the elements in each pair being formed to be rotationally symmetric while sharing one base line forming the retroreflection elements. A group of parallel V-shaped grooves in one direction (grooves x) forming the group of pairs of retroreflection elements has straight-line bottom tracks, the groups of parallel V-shaped grooves in the other two directions (grooves w1 and w2) have continuous bent-line bottom tracks bent at intersection points with the grooves x, the bottom tracks of the groups of parallel V-shaped grooves in the two directions (grooves w1 and w2) do not intersect with each other, and projection geometries of base planes (A-B-E1-D1 and A-B-E2-D2) forming the retroreflection elements are quadrilaterals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.