Method and device for checking a security element
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United States of America Patent
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Apr 9, 2019
Grant Date -
Oct 15, 2015
app pub date -
Oct 29, 2013
filing date -
Oct 31, 2012
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Abstract
A method and a device check a security element of a security document. The security element contains at least one particulate substance with electroluminescent properties and at least one field suppression element. The method includes applying an electric excitation field to the security element, generating an optical image of at least one region of the security element after or during the production of the electric excitation field, and detecting local intensity maxima in the optical image. The security element is verified if a number of local intensity maxima present at different image positions is greater than or equal to a specified number, the number being at least two.
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