Transducer for fingerprints and apparatus for analyzing fingerpr

Details Transducer for fingerprints and apparatus for analyzing fingerpr Transducer for fingerprints and apparatus for analyzing fingerpr

1980-05-22

1982-11-09

Hoag, Willard E.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

3408253, 3401463E, 356 71, H01J 314, G06K 900

Patent

active

043586775

ABSTRACT:
The fingerprint transducer contains a sensing member having a sensing surface for receiving a fingerprint. The sensing member is made of a material which has a transition or softening temperature that is higher than ambient temperature and close to the temperature of the finger. Particularly, the softening temperature is chosen such that the material of the sensing member will start to melt on the surface when the finger is pressed against the sensing surface. The sensing surface has a surface relief of random roughness. In other words, the sensing surface has variations in elevation which do not show a specific pattern. The method for analyzing fingerprints comprises the steps of generating a surface relief of random space on a sensing surface of a sensing member, generating the fingerprint on the sensing surface by pressing a finger thereto, and optically reading the fingerprint from the sensing surface.

REFERENCES:
patent: 3196011 (1965-07-01), Gunther et al.
patent: 3542545 (1970-11-01), Goffe
patent: 3660818 (1972-05-01), Amodei
patent: 3716359 (1973-02-01), Sheridon
patent: 3795514 (1974-03-01), Jvirblis et al.
patent: 3865488 (1975-02-01), Del Rio
patent: 4023969 (1977-05-01), Sheridon
patent: 4120585 (1978-10-01), De Palma et al.
patent: 4223062 (1980-09-01), Hession
Spie, vol. 123 (1977) pp. 32-36, "Optical Storage Materials and Methods."

Affiliated with

Also associated with

Rating

Transducer for fingerprints and apparatus for analyzing fingerpr does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Transducer for fingerprints and apparatus for analyzing fingerpr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transducer for fingerprints and apparatus for analyzing fingerpr will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-747537