Multi-directional cube corner retroreflective article
US8517546B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 31, 2009 |
| Grant date | Aug 27, 2013 |
| Priority date | — |
| Expiry date | Apr 23, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133553
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An object of the invention is to provide a multi-directional cube corner retroreflective article (may be referred to as a retroreflective article, hereinafter) capable of improving entrance angle characteristic and rotation angle characteristic.A multi-directional cube corner retroreflective article, wherein a large number of retroreflective element assemblies, each of which is formed by assembling triangular pyramidal cube corner retroreflective elements each having an isosceles-triangular base (ABC) and an element apex (H) while sharing an apex (C) and base lines of equal length (AC and BC) of the base, are connected, and a shape of an outer circumference of each of the retroreflective element assemblies is a regular polygon and the bases of at least two of the triangular pyramidal cube corner retroreflective elements are not parallel to a common plane including the outer circumference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.