Currency paper and banknote verification device
First Claim
1. A device for verifying authenticity of currency paper and banknotes comprising:
- a currency receiver arranged for accepting at least one edge of a proferred currency paper;
transmitter means proximate said currency receiver providing a pair of electronic signals of opposite phase;
detector means intermediate said transmitter means adjustably balancing said electronic signals when a security thread comprising a metallized plastic strip is absent from said currency paper; and
circuit means connected with said detector means determining an imbalance between said electronic signals when said security thread is within said currency paper.
3 Assignments
0 Petitions
Accused Products
Abstract
A photodiode and a phototransistor are positioned on opposite sides of a document subjected to verification for authenticity under transmitted light. A logic circuit determines the presence or absence of the security feature and correspondingly provides visual or audible indication thereof. The photodiode, phototransistor and related circuitry 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. A simplified capacitive proximity sensor can be employed, per se, for inexpensive applications or for redundant verification in combination with an optical detector. The shape of the capacitive sensor is configured to that of the security thread to discriminate between the security thread and the currency paper. Additional optical circuits are employed to detect counterfeit markings on the currency surface.
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Citations
21 Claims
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1. A device for verifying authenticity of currency paper and banknotes comprising:
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a currency receiver arranged for accepting at least one edge of a proferred currency paper; transmitter means proximate said currency receiver providing a pair of electronic signals of opposite phase; detector means intermediate said transmitter means adjustably balancing said electronic signals when a security thread comprising a metallized plastic strip is absent from said currency paper; and circuit means connected with said detector means determining an imbalance between said electronic signals when said security thread is within said currency paper. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A verification device for determining authenticity of currency and banknotes comprising:
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a first optical source positioned on one side of a proferred currency proximate a corresponding first optical sensor, said first optical sensor arranged for detecting reflected light from any reflective counterfeit means on said one side; a second optical source on said one side proximate a corresponding second optical sensor, said second optical sensor arranged for detecting non-reflected light from any non-reflective counterfeit means on said one side; and logic means connected with said first and second sensors for determining whether said non-reflective or reflective counterfeit means is present or absent from said one side and providing indication thereof. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification