Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1992-04-20
1993-11-09
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
356 71, 283 85, G06K 500
Patent
active
052605825
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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patent: 3980990 (1976-09-01), Berube
patent: 4524276 (1985-06-01), Ohtombe
patent: 4652015 (1987-03-01), Crane
patent: 4761205 (1988-08-01), Crane
patent: 4879000 (1989-11-01), Gausa
patent: 4973851 (1990-11-01), Lee
patent: 4980569 (1990-12-01), Crane et al.
patent: 5151607 (1992-09-01), Crane et al.
Danek Robert J.
Menelly Richard A.
Lee John R.
Nelms David C.
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