Security device for security document
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United States of America Patent
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Jan 16, 2018
Issued Date -
N/A
app pub date -
Apr 24, 2014
filing date -
Apr 24, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A security device for verifying an authenticity of a security doc-ument comprises an at least partially transparent multilayer substrate with a first surface and a second surface. A first pattern is arranged on the first surface. This first pattern is derivable using a first seed pattern. A second pattern is arranged on the second surface. This second pattern is derivable using a second seed pattern. The security device furthermore comprises a third pattern arranged between a first and a second substrate layer. The third pattern is derivable using an inversion of the first pattern, an inversion of the second pattern, and a non-inverted third seed pattern. Transmit lances and reflectivities of the patterns are selected such that in a reflection viewing mode, only the first or second seed pattern is visible, respectively. In a transmission viewing mode, only the third seed pattern is visible.
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