Electrostatic capacity detection apparatus and fingerprint...

Details Electrostatic capacity detection apparatus and fingerprint... Electrostatic capacity detection apparatus and fingerprint...

2005-08-30

2005-08-30

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C382S124000

Reexamination Certificate

active

06937031

ABSTRACT:
A capacitance sensor used as a fingerprint sensor is provided which includes, in addition to a sensor array (11) in which sensor cells (100) each with a sense electrode are disposed in the form of an array, a canceling dummy block (14) having, disposed in an area having no relation with any object under detection, one column of dummy cells (141) corresponding to each row in the sensor array (11) and each having a dummy electrode nearly identical in parasitic capacitance to the sense electrode of the sensor cell (100). Also, a differentiation output unit (183) is provided to differentiate between a sensed voltage Vsig sensed at the sensor array (11) by sensing circuit (13) and sensed voltage Vdmy sensed at the canceling dummy block (14), thereby eliminating the influence of a variation in parasitic capacitance Cp, caused by a production tolerance.

REFERENCES:
patent: 5225959 (1993-07-01), Stearns
patent: 6448790 (2002-09-01), Imai
patent: 6681033 (2004-01-01), Yano et al.
patent: 6795049 (2004-09-01), Toyoshima et al.
patent: 61-040517 (1986-02-01), None
patent: 05-215625 (1993-08-01), None
patent: 2000-213908 (2000-08-01), None
patent: 2000-346607 (2000-12-01), None

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