Capacitance-based verification device for a security thread embedded within currency paper
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United States of America Patent
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Mar 7, 1995
Issued Date -
N/A
app pub date -
Mar 8, 1993
filing date -
Dec 31, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A verification device for a security thread embedded within currency paper includes a pair of capacitive plates having applied thereto time-varying electronic signals that are 180.degree. out of phase. Disposed between the plates is a sensor element comprising a cylindrical wire dimensionally equal to the security thread. A guard electrode surrounds the sensor; the guard, sensor, and plates comprising a capacitance bridge. When the security thread in the currency is adjacent to the sensor and in proximity thereto, a capacitance imbalance occurs in the bridge. Electronic circuitry is responsive to this imbalance and provides an indication of a valid security thread embedded within the proffered currency paper.
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