Cube-corner retroreflective article
US8388154B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 2008 |
| Grant date | Mar 5, 2013 |
| Priority date | — |
| Expiry date | Sep 18, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/124
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A cube-corner retroreflective article is provided with a number of cube-corner retroreflective element pairs each formed by a pair of cube-corner retroreflective elements sharing one side. Each of the cube-corner retroreflective elements has reflective lateral surfaces including two trapezoidal reflective lateral surfaces and one pentagonal or isosceles-triangular reflective lateral surface, and a projection shape of a quadrangle when projected onto a common plane, wherein ratios (rHA/rHC and rHB/rHC) between a length (rHC) of a ridge (HC) shared by the trapezoidal reflective lateral surfaces (HAFC and HBGC) and lengths (rHA and rHB) of other ridges (HA and HB) are in a range of 0.5 to 1.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.