Electrostatic capacitance sensor and fingerprint collator...

Details Electrostatic capacitance sensor and fingerprint collator... Electrostatic capacitance sensor and fingerprint collator...

2005-04-19

2005-04-19

Le, N. (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S672000, C382S124000, C713S186000

Reexamination Certificate

active

06882164

ABSTRACT:
A capacitance sensor usable as a fingerprint sensor is provided in which a timing controller (16) provides such a switching control as to first cause a switch (SA) in a sensor cell (100-k) to turn on to set the potential at a sense electrode to a reference potential and then a switch SB to turn on after the switch (SA) is turned off, whereby charge is stored from the sensor cell (100-k) into a reference capacitance Cf1of a sensing circuit (13-k), the sensitivity of sensing the capacitance is raised by increasing the number of times the charge storage is repeated and only signal components are extracted by reducing noise components by averaging.

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International Search Report for PCT/JP02/06814 dated Oct. 15, 2002.

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