Title:
PIEZOELECTRIC IDENTIFICATION DEVICE AND APPLICATIONS THEREOF
Document Type and Number:
WIPO Patent Application WO2001071648
Kind Code:
A3
Abstract:
An identification device having a piezoelectric sensor array is used to obtain biometric data. In one embodiment, a piezo ceramic sensory array is used to obtain biometric data. In another embodiment, a multi-layer sensor array structure having a PVDF layer in between two conductor grids orthogonal to one another is used to obtain biometric data. Urethane can be added to one side of the sensor array where a finger is placed. A foam substrate can be used as a support. Multiplexers are switched to control the sensor. The device has several operating modes for obtaining a variety of biometric data, including an impedance detection mode, a voltage detection mode, an imaging mode, and a Doppler-shift detection mode. The presence of a fingerprint on the sensor can be used to turn-on the device. The device is capable of capturing a fingerprint, forming a three-dimensional map of a finger bone, and/or determining the direction and speed of arteriole and/or capillary blood flow in a finger. A single pixel or a group of pixels can be detected and readout to a memory. The device can be used as an electronic signature device. The device can operate as part of a personal area network, using a public service layer according to the invention.
Inventors:
SCOTT WALTER GUY
JONES DONALD EDWARD
JONES DONALD EDWARD
Application Number:
PCT/US2001/009187
Publication Date:
March 28, 2002
Filing Date:
March 23, 2001
Export Citation:
Assignee:
CROSS MATCH TECHNOLOGIES INC (US)
International Classes:
A61B5/0295; A61B5/0285; A61B5/117; A61B8/06; A61B8/08; G06K9/00; G06T1/00; H01L41/08; H01L41/113; H02N2/00; H04R17/00; (IPC1-7): G06K9/00
Foreign References:
| US5311095A | 1994-05-10 | |||
| US4394773A | 1983-07-19 | |||
| US5971927A | 1999-10-26 | |||
| US5273045A | 1993-12-28 | |||
| US5623930A | 1997-04-29 | |||
| DE19750179A1 | 1999-02-25 | |||
| EP0649116A1 | 1995-04-19 | |||
| US4316115A | 1982-02-16 | |||
| US5421335A | 1995-06-06 |
Other References:
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 04 30 April 1997 (1997-04-30)
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 06 31 July 1995 (1995-07-31)
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 06 31 July 1995 (1995-07-31)
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