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Real time fingerprint recording terminal

  • US 3,975,711 A
  • Filed: 08/30/1974
  • Issued: 08/17/1976
  • Est. Priority Date: 08/30/1974
  • Status: Expired due to Term
First Claim
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1. Apparatus for forming an image of a fingerprint pattern for comparison with a stored pattern comprising:

  • transparent right triangular prism means characterized by first and second opposed sides, first and second intersecting sides forming a common first edge, and a major side forming common second and third edges with said respective first and second intersecting sides,said major side having a concave portion therewithin adapted for contact by the ridges of a finger,light source means for forming a substantially parallel light beam having a first optical axis for incidence upon said first intersecting side whereby said light beam is refracted to illuminate said ridges at said concave portion for forming a first image of said ridges within said prism adjacent said first intersecting side, andimage forming lens means on a second optical axis for forming a second image in response to said first image.

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