Currency verification device including ferrous oxide detection

Details Currency verification device including ferrous oxide detection Currency verification device including ferrous oxide detection

1991-05-02

1992-09-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

356 71, G06K 500

Patent

active

051516071

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.

REFERENCES:
patent: 3980990 (1976-09-01), Berube
patent: 4524276 (1985-06-01), Ohtombe
patent: 4652015 (1987-03-01), Crane
patent: 4973851 (1990-11-01), Lee
patent: 4980569 (1990-12-01), Crane et al.

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