Patent · US Active

Thin-layer element having an interference layer structure

US9274258B2 · kind B2 · utility

12Cited by

9References

32Claims

0Family size

Assignee

GIESECKE & DEVRIENT GMBH · DE

Inventors

Christian Fuhse · Otterfing, DE
Michael Rahm · Bad Tölz, DE
Manfred Heim · Munich, DE
Ralf Liebler · Darmstadt, DE

Key dates

Filing date	Sep 10, 2010
Grant date	Mar 1, 2016
Priority date	—
Expiry date	Mar 24, 2033

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB42D2035/36
WIPO fieldOther consumer goods
WIPO sectorOther fields

Abstract

The present invention relates to a thin-film element (30) having an interference layer structure for security papers, value documents and the like, having at least two semitransparent absorber layers (34, 38) and at least one dielectric spacing layer (36) arranged between the at least two absorber layers. According to the present invention, it is provided that the two absorber layers (34, 38) are each formed from a material having a complex refractive index N whose real part n and imaginary part k differ at least in a portion of the visible spectral range by a factor of 5 or more.

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