Counterfeit bill warning device
AssigneeImperial Inc.
InventorJerome T. Gober
Life of this patent
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Abstract
According to the invention, a device for detecting counterfeit paper currency is provided which utilizes the characteristic fluorescence of genuine paper currency to detect counterfeit paper currency. An ultraviolet lamp illuminates the paper currency of unknown origin which the currency is placed on a stage held in fixed relationship to the ultraviolet lamp by a housing. A sensor circuit responds to the fluorescent radiation from the paper currency to give a signal to an indicator which displays an indication of the fluorescence of the unknown paper currency relative to genuine paper currency. The sensor is a photoresistor and the indicator is a variable intensity light or a digital display.
Claims12
A device for detecting counterfeit paper currency utilizing the characteristic fluorescence of genuine paper currency, said device comprising,
- an ultraviolet lamp for illuminating paper currency to be tested,
- a housing supporting said ultraviolet lamp,
- a stage supporting the paper currency, said stage being mounted to the housing and illuminated by the ultraviolet lamp,
- a sensor mounted within the housing and responsive to the fluorescent radiation from the paper currency for providing a variable signal proportional to the intensity of the fluorescence, and
- means responsive to the variable signal from said sensor for providing a physical indication of the degree of fluorescence of the paper currency including adjustable means for providing a first threshold signal corresponding to the fluorescence of genuine paper currency, means for providing a second signal corresponding to the fluorescence of the illuminated paper currency, and a variably responsive indicator which responds to second signal in excess of the first threshold signal.
Dependencies are inferred from the claim text.