Capacitive fingerprint sensor

Details Capacitive fingerprint sensor Capacitive fingerprint sensor

1980-06-05

1982-10-05

Boudreau, Leo H.

Communications: electrical

Digital comparator systems

361283, G06K 900

Patent

active

043530567

ABSTRACT:
The sensor incorporates a sensing member which has a sensing surface for receiving a fingerprint and sensing means for sensing the ridges and valleys of the skin of the finger under investigation. The sensing member contains a multitude of small capacitors. When the finger is pressed against the sensing surface, the capacitances of the capacitors are locally changed in accordance with the ridges and valleys. The information about the capacitance distribution is transformed into an electric signal.

REFERENCES:
patent: 3622989 (1971-11-01), Dowdy
patent: 3648240 (1972-03-01), Jacoby et al.
patent: 3781855 (1973-12-01), Killen
patent: 3865488 (1975-02-01), Del Rio
patent: 3993888 (1976-11-01), Fellman
patent: 4281313 (1981-07-01), Boldridge
Bevczy et al., "Transducer with a Sense of Touch" Tech. Support Package, J.P.L., Pasadena California, Nov. 1979.

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