Currency note validator

Details Currency note validator Currency note validator

1985-07-31

1986-05-06

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

356 71, G06K 500

Patent

active

045874344

ABSTRACT:
A microprocessor controlled currency note validator includes a transport for propelling an inserted note longitudinally past an optical scanning station. Infrared and visible color reflectance readings and opacity readings are taken along several longitudinally extending tracks on the note. The microprocessor normalizes the reflectance readings to accommodate for variations in soiling and compares the normalized reflectance readings and the opacity readings against stored acceptance band data, correcting for pattern registration variations if necessary. The length of the note is also checked and a validation signal is provided if the note passes the optical tests and the length test. During the idle cycle, the microprocessor automatically adjusts the optical circuitry to compensate for component drift and dirt buildup. The microprocessor also provides a visual display of any detected malfunctions.

REFERENCES:
patent: 4075604 (1978-02-01), Degasperi
patent: 4184081 (1980-01-01), Bergamini
patent: 4204765 (1980-05-01), Iannadrea et al.
patent: 4303832 (1981-12-01), Ehrat
patent: 4311914 (1982-01-01), Huber
patent: 4319137 (1982-03-01), Nakamura et al.
patent: 4381447 (1983-04-01), Horvath et al.
patent: 4386432 (1983-05-01), Nakamura et al.

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