Bill or security discriminating apparatus using P-polarized and

Details Bill or security discriminating apparatus using P-polarized and Bill or security discriminating apparatus using P-polarized and

1997-06-13

1999-04-06

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250225, 356 71, 356369, 283 85, 283 90, G07D 700

Patent

active

058922393

ABSTRACT:
A bill or security discriminating apparatus includes at least one irradiating device for irradiating a surface of a bill or security at a predetermined angle with the surface thereof, at least one polarization separating device for receiving light reflected by the surface of the bill or security and separating the received light into P-polarized light and S-polarized light, at least one first light detector for photoelectrically detecting the P-polarized light separated by the at least one polarization separating device and generating an electrical signal in accordance with intensity of the detected light, at least one second light detector for photoelectrically detecting the S-polarized light separated by the at least one polarization separating device and generating an electrical signal in accordance with intensity of the detected light, and a discriminator for discriminating the bill or security in accordance with the intensity of the P-polarized light and S-polarized light based on the electrical signals input from the at least one first light detector and the at least one second light detector. According to the thus constituted bill or security discriminating apparatus, it is possible to discriminate bills or securities with high accuracy even if they are damaged or wrinkled.

REFERENCES:
patent: 4544836 (1985-10-01), Galvin et al.
patent: 4896901 (1990-01-01), Ekelund
patent: 4980569 (1990-12-01), Crane et al.
patent: 4990790 (1991-02-01), Yoshihara
patent: 5345308 (1994-09-01), Rushman
patent: 5535871 (1996-07-01), Harbaugh
patent: 5543608 (1996-08-01), Rontalainen

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