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Capacitive circuit array for fingerprint sensing

  • US 6,429,666 B1
  • Filed: 04/17/2000
  • Issued: 08/06/2002
  • Est. Priority Date: 04/17/2000
  • Status: Expired due to Fees
First Claim
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1. An electronic fingerprint sensor array comprising a plurality of pickup and voltage electrodes formed on the top surface of said sensor array, the electrodes being formed in a two dimensional pattern;

  • means for applying voltages to said plurality of voltage electrodes in a predetermined manner such that equal and opposite electric field lines terminate at the pickup electrodes such that the net voltage readout from said pickup electrode is substantially zero in the absence of a user fingerprint applied to said top surface of said sensor array, the alternating opposite polarity voltages being simultaneously applied to said voltage electrodes, said voltage and pickup electrodes being configured such that a straight line passing through the center of said pickup electrodes intersects the two opposite voltage electrodes at a substantially equal distance from said center.

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