Browse Prior Art Database

Finger Print Sensor

IP.com Disclosure Number: IPCOM000076724D
Original Publication Date: 1972-Apr-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

James, RP: AUTHOR

Abstract

This finger-print sensor, utilizing small metal pads, is adapted to convert a finger-print pattern to binary information which can be utilized by a computer for comparison or analysis.

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Finger Print Sensor

This finger-print sensor, utilizing small metal pads, is adapted to convert a finger-print pattern to binary information which can be utilized by a computer for comparison or analysis.

The sensor is provided with many conductive pads 10 supported on a suitable semiconductor substrate 12. The pads 10 are relatively small in comparison to the finger-print ridges 14. A voltage source 16 is applied to the top of the finger through electrode 18. A conductive path is provided between electrode 18 through selected pads 10, which contact the pattern 14 and to substrate 12. Suitable circuitry associated with pads 10 provides binary information corresponding to the pattern 14. For example, the pads 10 can be the gate electrodes of individual field-effect transistor elements, fabricated directly in substrate 12 with suitable current lines to obtain the binary information.

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