Currency verification device for detecting the presence or the absence of security threads
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United States of America Patent
Stats
-
Nov 9, 1993
Grant Date -
N/A
app pub date -
Apr 20, 1992
filing date -
Apr 20, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A linear array of photodiodes and phototransistors is positioned on opposite sides of currency paper subjected to verification for authenticity under transmitted and reflected light. A logic circuit determines the presence or absence of the security feature and correspondingly provides visual or audible indication thereof. The photodiodes, phototransistors and related circuitry are arranged within an enclosure that is located next to a currency-receiving device such as a cash register. Visual or audible indicators are mounted on the device for immediate indication of the currency verification to the cashier. The arrangement of the photodiodes and phototransistors transverse to the major length of the currency paper detects the security feature while confirming that the security feature is within the currency paper and not on either surface.
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