Hexagonal cube corner retroreflective article
US8511840B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 2010 |
| Grant date | Aug 20, 2013 |
| Priority date | — |
| Expiry date | Jul 7, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/124
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A hexagonal cube corner retroreflective article has a set of a large number of hexagonal cube corner retroreflective elements. In the retroreflective element, at least one reflective lateral face (face a, face b, and/or, face c) is divided into a pair of an upper secondary reflective lateral face (face a1, face b1, and/or face c1) and a lower secondary reflective lateral face (face a2, face b2, and/or face c2) partitioned by a line segment (EF, FD, and/or DE) connected by apexes (E, F, and/or D) constituting that reflective lateral face, in which two secondary reflective lateral faces constituting the pair of the secondary reflective lateral faces are not on the same plane. By these features the retroreflective article provides excellent observational angle characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.