Security element for producing value documents
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United States of America Patent
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Jun 16, 2020
Grant Date -
Aug 3, 2017
app pub date -
Jul 14, 2015
filing date -
Jul 31, 2014
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Abstract
A security element for manufacturing value documents provides at least one image, formed by a grating structure which has a plurality of trough-shaped microcavities. The microcavities have a structure width from 0.5 μm to 3 μm and an aspect ratio of 0.4 or greater, a metal-containing coating is applied to the grating structure, and in the grating structure the trough-shaped microcavities are separated from each other respectively by strips which are planar and respectively more than 200 nm and maximally 1,200 nm wide.
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