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Scanning capacitive semiconductor fingerprint detector

  • US 6,317,508 B1
  • Filed: 01/13/1998
  • Issued: 11/13/2001
  • Est. Priority Date: 01/13/1998
  • Status: Expired due to Term
First Claim
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1. A scanning fingerprint detection system, which comprises:

  • a sensing array having a first dimension and a second dimension;

    said first dimension extending at least the width of a fingerprint;

    said second dimension extending less than the length of a fingerprint;

    said sensing array formed of a plurality of elements;

    wherein each of said elements is a capacitive sensing cell and having a size less than the width of a ridge of a fingerprint;

    means for scanning said sensing array to capture successive images of successive portions of the fingerprint formed as the fingerprint is moved across the sensing array in a direction parallel to the second dimension; and

    means for assembling the captured successive images into a complete fingerprint image.

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