GOLD-COLORED THIN-FILM ELEMENT WITH MULTILAYER STRUCTURE
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United States of America Patent
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Issued Date -
Sep 27, 2012
app pub date -
Dec 10, 2010
filing date -
Dec 14, 2009
priority date (Note) -
Abandoned
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Abstract
The invention relates to a thin-film element (30) with multilayer structure for security papers, value documents and the like, which, upon viewing in incident light, appears gold-colored and which as at least two semitransparent mirror layers (34, 38) and at least one dielectric spacer layer (36) arranged between the at least two mirror layers, so that, upon measuring the transmission of unpolarized light in the blue wavelength range from 420 nm to 490 nm, there is found a resonance with a full width at half maximum of 70 to 150 nm.
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