Image analysis – Applications – Personnel identification
Patent
1997-05-16
1999-08-17
Boudreau, Leo H.
Image analysis
Applications
Personnel identification
G06K 900
Patent
active
059405260
ABSTRACT:
A fingerprint sensor includes a plurality of semiconductor devices adjacent a substrate and defining active circuit portions, and having only three metal layers. More particularly, the sensor may include a first metal layer interconnecting predetermined ones of the plurality of semiconductor devices; a second metal layer defining a ground plane; and a third metal layer comprising an array of electric field sensing electrodes connected to active circuit portions for generating an output related to a sensed fingerprint. The fingerprint sensor may also include a package surrounding the substrate and having an opening aligned with the sensing electrodes. In addition, a first external electrode may be carried by the package for contact by a finger. The sensor may thus also include an excitation drive circuit connected between the ground plane and the first external electrode for generating electric fields between the electric field sensing electrodes and adjacent finger portions. A power control circuit is for controlling operation of active circuit portions based upon sensing finger contact with the first external electrode so that the active circuit portions are powered upon sensing finger contact with the first external electrode and otherwise grounded. A second external electrode may be connected to a bleed resistor to bleed charge from the finger prior to switching from the grounded to the powered state. An amplifier connected between each electric field sensing electrode and associated shield electrode may be operated at a gain of greater than one for additional noise rejection.
REFERENCES:
patent: 3398558 (1968-08-01), Benenati
patent: 3781855 (1973-12-01), Killen
patent: 4202120 (1980-05-01), Engel
patent: 4210899 (1980-07-01), Swonger et al.
patent: 4353056 (1982-10-01), Tsikos
patent: 4557504 (1985-12-01), Kuhns
patent: 4768021 (1988-08-01), Ferraro
patent: 4811414 (1989-03-01), Fishbine et al.
patent: 4983846 (1991-01-01), Rios et al.
patent: 4993068 (1991-02-01), Piosenka et al.
patent: 5222152 (1993-06-01), Fishbine et al.
patent: 5224173 (1993-06-01), Kuhns et al.
patent: 5245329 (1993-09-01), Gokcebay
patent: 5280527 (1994-01-01), Gullman et al.
patent: 5325442 (1994-06-01), Knapp
patent: 5363453 (1994-11-01), Gagne et al.
patent: 5386104 (1995-01-01), Sime
patent: 5467403 (1995-11-01), Fishbine et al.
patent: 5509083 (1996-04-01), Abtahi et al.
patent: 5513272 (1996-04-01), Bogosian, Jr.
patent: 5541994 (1996-07-01), Tomko et al.
patent: 5546471 (1996-08-01), Merjanian
patent: 5598474 (1997-01-01), Johnson
patent: 5603179 (1997-02-01), Adams
patent: 5613712 (1997-03-01), Jeffers
patent: 5623552 (1997-04-01), Lane
patent: 5778089 (1998-07-01), Borza
Gebauer Dave
Lowther Rex
Setlak Dale R.
van Vonno Nicolaas W.
Boudreau Leo H.
Harris Corporation
Novik Dmitry A.
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