Fingerprint transducer and reading apparatus

Details Fingerprint transducer and reading apparatus Fingerprint transducer and reading apparatus

1980-05-22

1982-06-29

Hoag, Willard E.

Optics: measuring and testing

Document pattern analysis or verification

3401463E, 365126, G06K 710, G06K 900

Patent

active

043369987

ABSTRACT:
The fingerprint transducer contains a sensing member having a sensing surface for receiving a fingerprint, a device for generating an electrostatic charge on the sensing surface and a heating device for heating the sensing surface up to a temperature which is approximately the softening temperature of the sensing member. The method for enhancing fingerprints comprises the steps of generating the fingerprint on the sensing surface, electrostatically charging the sensing surface, heating the sensing surface up to the softening temperature, and thereafter cooling down the sensing member.

REFERENCES:
patent: 2777987 (1957-01-01), Walkup
patent: 2856533 (1958-10-01), Rosenthal
patent: 2922883 (1960-01-01), Giamo
patent: 3542545 (1970-11-01), Goffe
patent: 3764311 (1973-10-01), Bean
patent: 3858973 (1975-01-01), Heurtley
patent: 3871002 (1975-03-01), Shadlich et al.
patent: 4015248 (1977-03-01), Pekau et al.
patent: 4065308 (1977-12-01), Bergen

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