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Extended fingerprint reading apparatus

  • US 5,818,956 A
  • Filed: 10/23/1995
  • Issued: 10/06/1998
  • Est. Priority Date: 10/23/1995
  • Status: Expired due to Fees
First Claim
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1. A fingerprint reading device comprising:

  • a transparent flexible membrane of uniform thickness which when depressed follows the profile of a finger, making full contact with the fingerprint area including the sides of the finger;

    said transparent flexible membrane fixed to a housing inside which an illumination source, a Selfoc optic fibre lens array, and a linear array of reading elements remain fixed relative to each other, traversing in a path identical to the curvature of the transparent membrane from one side of the finger to the other where contact is made, equidistant to the transparent flexible membrane throughout the path traversed;

    said reading elements which read one line of the fingerprint at a time, whereby each line is parallel to the long axis of the finger, advancing to consecutive lines upon completing the reading operation for each line;

    said illumination source which directs a linear beam of light to the fingerprint, is focused by a Selfoc lens array on the reading elements to produce outputs proportional to the intensity of incident light for each picture element, creating a digital representation of each line.

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