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Finger identification

  • US 4,322,163 A
  • Filed: 11/17/1980
  • Issued: 03/30/1982
  • Est. Priority Date: 10/25/1977
  • Status: Expired due to Term
First Claim
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1. In an optical finger image processing apparatus, the improvement comprising:

  • a platen having a front surface adapted to receive an interrogating light beam and a back surface adapted to receive a finger thereon, said platen having a transparent substrate, a first deformable, resilient transparent layer on the back surface of said substrate, said layer having sufficient thickness and being sufficiently deformable so that forces transmitted by the ridges of a finger pressed against the back surface on said platen will readily cause said layer to deform in the zones directly under the ridges of the applied finger, and a reflective layer on the back surface of said first deformable, resilient layer, said reflective layer being sufficiently thin so that forces transmitted by the ridges of a finger pressed against the back surface of said platen will be readily transmitted to said deformable resilient layer.

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