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Fingerprint input apparatus

  • US 5,177,802 A
  • Filed: 03/04/1991
  • Issued: 01/05/1993
  • Est. Priority Date: 03/07/1990
  • Status: Expired due to Term
First Claim
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1. A fingerprint input apparatus comprising:

  • a lightguide plate having a through hole on which a finger is placed;

    light sources for emitting rays of light;

    means for directing said rays of light into surfaces of said lightguide plate in a manner to keep such an angle of incidence as allowing said rays of light to be totally reflected within said lightguide plate, said lightguide plate being constructed to guide said rays of light to said through hole and to said finger; and

    an image pickup means located in opposition to said finger through said through hole therebetween, and said image pickup means being constructed to pick up light rays reflected from said finger placed on the through hole.

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