Importance

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Abstract

A linear array of photo-emitters and photodetectors is positioned on one side of currency paper subjected to verification for authenticity under transmitted and reflected light. The focus of the photo emitters is adjusted for the top surface, center and bottom surface of the currency paper. A logic circuit-determines the presence or absence of the security feature and correspondingly provides visual or audible indication thereof. A memory device contains stored information identifying currency denomination and a comparison is made at the time of verification to also determine the denomination of the proffered currency. The photo emitters, photo-detectors 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 along with the currency denomination. The arrangement of the photo emitters and photo-detectors 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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First Claim