Currency verification device including ferrous oxide detection
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United States of America Patent
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Sep 29, 1992
Grant Date -
N/A
app pub date -
May 2, 1991
filing date -
May 2, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An automatic verification device for currency and other security paper containing an embedded security thread first determines the presence of the thread within the paper and then assures that the thread is not present on the paper surface. The device is in the form of a stand-alone currency insertion unit similar to a credit card reader and includes a metal detection circuit to verify the presence of the embedded metal thread. Photo detectors within the unit detect the presence of reflected light off either or both currency surfaces. The currency is verified when the metal is detected and there is no reflection off either surface of the currency paper.
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