Device for investigation of a finger relief

Details Device for investigation of a finger relief Device for investigation of a finger relief

1980-09-22

1983-05-31

McGraw, Vincent P.

Optics: measuring and testing

Document pattern analysis or verification

350 371, 382 4, G06K 900, G06K 928

Patent

active

043858317

ABSTRACT:
The fingerprint sensor device derives an electric output signal in accordance with the topographic relief of a finger under investigation. The sensor incorporates a radiation source, a fingerbed, a first radiation transmitting device, a scanning device, a second radiation transmitting device, and a measuring device responsive to the radiation. The fingerbed has an opening for passing a beam of radiation (light or ultrasound, for instance) from the source therethrough. The scanning device scans this beam of radiation across the finger. Thus, the finger relief is directly scanned by a beam of small impingement spot. The back scattered radiation is directed to the measuring device. Here, the intensity distribution is determined.

REFERENCES:
patent: 3201961 (1965-08-01), Williams et al.
patent: 3516059 (1970-06-01), Hindman et al.
patent: 3961838 (1976-06-01), Zanoni
patent: 4053228 (1977-10-01), Schiller
patent: 4120585 (1978-10-01), DePalma et al.
patent: 4227805 (1980-10-01), Schiller
"Remote Measurement of Distance and Thickness Using a Deflected Laser Beam", Bodlaj et al., Applied Optics, vol. 15 #6, Jun. 76, pp. 1432-1436.

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