Patent · US Active

Method and device for checking a security element

US10255515B2 · kind B2 · utility

0Cited by

8References

11Claims

0Family size

Assignee

BUNDESDRUCKEREI GMBH · DE

Inventors

Manfred Paeschke · Wandlitz, DE
Olga Kulikovska · Berlin, DE
Joerg Fischer · Laboe, DE
Detlef Starick · Berlin, DE

Key dates

Filing date	Oct 29, 2013
Grant date	Apr 9, 2019
Priority date	—
Expiry date	Feb 26, 2034

Classification

Technology area (CPC H)Electricity
CPC primaryH04N23/56
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.