SECURITY ELEMENT FOR A DOCUMENT OF VALUE AND/OR A SECURITY DOCUMENT
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United States of America Patent
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Oct 20, 2016
app pub date -
Nov 15, 2013
filing date -
Nov 15, 2013
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Abstract
A security element for a document of value is arranged on a transparent layer such as a film and includes a first periodic, optical structure, for example a grid of lines or a grid of points, which forms a first coating on a first side of the transparent layer, and a second periodic, optical structure, for example a grid of lines or a grid of points, which forms a second coating on the second side, which is disposed opposite the first side of the transparent layer. The first optical structure and the second optical structure overlap such that, as viewed by outside observer at a certain, predetermined viewing angle (α) or lighting angle, the structures show a color-changing effect.
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