Patent · US Expired

Optical identification element

US6496287B1 · kind B1 · utility

72Cited by

6References

8Claims

0Family size

Assignee

ROLIC AG · CH

Inventors

Hubert Seiberle · Lörrach, DE
Franco Moia · Frenkendorf, CH
Martin Schadt · Seltisberg, CH

Key dates

Filing date	Oct 4, 2000
Grant date	Dec 17, 2002
Priority date	—
Expiry date	Oct 4, 2020

Classification

Technology area (CPC G)Physics
CPC primaryG03H2250/38
WIPO fieldOther consumer goods
WIPO sectorOther fields

Abstract

An optical component in the form of an identification element (such as for counterfeit protection or copy protection) includes an optically anisotropic layer comprising regions of different optical axes that is arranged over a reflector. The anisotropic layer may be implemented with a liquid crystal polymer in which the orientation of the liquid crystals is different in different areas. Such an orientation pattern is initially hidden from a viewer, but becomes visible by means of an additional polariser. To improve the visual appearance of the identification element, a white light hologram may be used for the reflector.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.