Sensor for verification of genuineness of security paper
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United States of America Patent
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Jun 16, 1992
Grant Date -
N/A
app pub date -
Sep 10, 1990
filing date -
Mar 10, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and a device for automatic verification of genuineness of a banknote or a document comprising a watermark is described. A two-part, doubly active capacitive sensor device (4, 6, 7) is used. A symmetry property of the sensor output signal is changed in a predetermined manner when a correct watermark is present in a coinciding position with shape-adapted capacitor electrodes (4, 6).
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