Contact imaging device

Details Contact imaging device Contact imaging device

1995-11-06

1999-05-25

Kelley, Christopher S.

Image analysis

Applications

Personnel identification

2502081, G06K 900

Patent

active

059076275

ABSTRACT:
A fingerprint sensing device and recognition system includes an array of closely spaced apart semiconductor dies bonded to a substrate. The dies are spaced with a minimal space that will ensure that adjacent edges of the dies do not wipe against one another when a finger is pressed upon them. Each die includes an row/column array of sense elements that are coupled to a drive circuit and a sense circuit by sets of row and column conductors, respectively. The sense elements are actively addressable by the drive circuit. Capacitances resulting from individual finger surface portions in combination with sense electrodes are sensed by the sense circuit by applying a potential to the sense electrodes and measuring charging characteristics.

REFERENCES:
patent: 4429413 (1984-01-01), Edwards
patent: 4577345 (1986-03-01), Abramov
patent: 4695716 (1987-09-01), Tandon et al.
patent: 5325442 (1994-06-01), Knapp
patent: 5559504 (1996-09-01), Itsumi et al.

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