Patent · US Expired

Sensor for measurement for wet and dry fingers

US7606398B2 · kind B2 · utility

11Cited by

3References

20Claims

0Family size

Assignee

IDEX ASA · NO

Inventors

Jon Nysæther · Stavanger, NO
Knut Riisnæs · Oslo, NO
Ørjan G. Martinsen · Kongsberg, NO
Geir Mostad · Oslo, NO
Nicolai W. Christie · Sandefjord, NO
Rune Pedersen · Heggedal, NO

Key dates

Filing date	Dec 6, 2002
Grant date	Oct 20, 2009
Priority date	—
Expiry date	Sep 10, 2025

Classification

Technology area (CPC G)Physics
CPC primaryG06V40/1306
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

A sensor device for performing measurements on an at least partially conductive surface includes a number of conductive structures at or directly below the sensor surface. The conductive structures consist of at least one stimulation or current sink electrode and a number of sensor elements coupled to interrogation electrodes in an electronic circuit for measuring impedance between the electrodes and the stimulation electrode. The sensor device also includes at least one additional clamping electrode positioned in the vicinity of the sensor elements and coupled to a chosen voltage.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.