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Method and system for acoustic impediography biometric sensing

  • US 8,805,031 B2
  • Filed: 05/08/2008
  • Issued: 08/12/2014
  • Est. Priority Date: 05/08/2008
  • Status: Active Grant
First Claim
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1. A method for capturing an image of a fingerprint in a sensing device, comprising:

  • placing fingerprint tissue of a finger in acoustical contact with a sensor matrix comprising an arrangement of piezo pillars;

    generating oscillations and acoustic waves within said piezo pillars via an inverse piezo-eleetrical effect;

    measuring an acoustic impedance load for each of said piezo pillars by measuring damping of oscillations for each of said piezo pillars;

    distinguishing at least ore ridge from at least one valley of said fingerprint tissue based upon said acoustic impedance load for each of a plurality of said piezo pillars, and whereina first pillar within said matrix is configured to receive oscillation simultaneously with a second set of pillars within said matrix, said second set of pillars including at least one pillar that is adjacent to said first pillar, and including at least one pillar that is not adjacent to said first pillar, and wherein none of said second set of pillars has a surface that faces and is adjacent to a surface of said first pillar, and whereinsaid pillars other than said first pillar and said second set of pillars, are not configured to receive said oscillation simultaneously with said first pillar and said second set of pillars.

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