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Fingerprint reading device and method thereof

  • US 6,462,563 B1
  • Filed: 08/11/2000
  • Issued: 10/08/2002
  • Est. Priority Date: 08/12/1999
  • Status: Expired due to Term
First Claim
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1. A fingerprint reading device comprising:

  • a fingerprint reading sensor having a first group of electrodes arranged in a plurality of lines extending in a first direction, a second group of electrodes arranged in a plurality of lines extending in a second direction intersecting the first direction, an insulation film provided between the first group of electrodes and the second group of electrodes, and a surface protective film formed of a dielectric substance provided over the first and second groups of electrodes, each point at which one electrode of the second group of electrodes crosses over one electrode of the first group of electrodes being a respective cell of the fingerprint reading sensor; and

    a drive circuit for measuring an electrostatic capacity between each of the electrodes and a finger touching the surface protective film by sequentially applying a predetermined voltage to one of the first group of electrodes and the second group of electrodes and at the same time sequentially applying the predetermined voltage to the other group of electrodes, and measuring a change in electrostatic capacity at the respective cells.

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