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Security-paper-verification-device

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Security paper verification device

Details

Inventors: Crane, Timothy T.; Menelly, Richard A.; Danek, Robert J.;
Assignee:
Primary Examiner: Westin; Edward P.
Assistant Examiner:
Attorney, Agent or Firm:

A photodiode and phototransistor are positioned on one side of a document subjected to verification for authenticity under both transmitted and reflected light. A corresponding photodiode and phototransistor on the opposite side of the document are arranged for receiving the light transmitted through the currency if the security feature is not present. A logic circuit determines the presence or absence of the security feature and correspondingly provides visual or audible indication thereof. The photodiodes, phototransistors and circuit are arranged within an enclosure that is attached to a currency receiving device such as a cash register. The visual or audible indicators are mounted on the cash register for immediate indication of the currency verification to the cashier.

DETAILED DESCRIPTION A photodiode and phototransistor array is arranged on one side of paper currency while a corresponding phototransistor array is arranged on an opposite side thereof.
Upon energizing a selected photodiode, an associated logic circuit determines whether the associated phototransistors on both sides of the paper appropriately respond thereto.
Indication of PASS or FAILURE is provided by means of red and green photo indicators.

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