Electric field fingerprint sensor apparatus and related methods

  • US 5,963,679 A
  • Filed: 01/26/1996
  • Issued: 10/05/1999
  • Est. Priority Date: 01/26/1996
  • Status: Expired due to Term
First Claim
Patent Images

1. A fingerprint sensor comprising:

  • an array of electric field sensing electrodes;

    a dielectric layer on a first surface of said array of electric field sensing electrodes, said dielectric layer for receiving a finger adjacent thereto; and

    coherent drive means for applying a coherent electric field drive signal to said array of electric field sensing electrodes and adjacent portions of the finger so that said array of electric field sensing electrodes produce a fingerprint image output signal, said coherent drive means comprisinga second dielectric layer on a second surface of said array of electric field sensing electrodes opposite the first surface, anda common drive electrode extending beneath at least a plurality of electric field sensing electrodes of said array of electric field sensing electrodes with the second dielectric layer therebetween so that the electric field drive signal radiates vertically between said common drive electrode and electric field sensing electrodes.

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