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Roll fingerprint processing apparatus

  • US 4,553,837 A
  • Filed: 10/24/1983
  • Issued: 11/19/1985
  • Est. Priority Date: 10/24/1983
  • Status: Expired due to Fees
First Claim
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1. An improved fingerprint processing apparatus capable of generating a roll fingerprint image, the apparatus of the type having a source of an interrogating light beam, the beam capable of being modulated to provide a reflected light beam having fingerprint information, optical scanning means capable of causing the interrogating light beam to scan a fingerprint object, an array of photoelectric transducers, an imaging lens positioned in the path of the reflected light to provide a fingerprint image at said array, said array being arranged in a pre-determined linear form for receiving the modulated light beam and for converting the fingerprint information carried by said modulated light into a plurality of sets of information signals representing a line by line scan of the fingerprint object, and multi-element electrical scanning means to electronically scan the information signal outputs of the array and to synchronize the electric scan to incremental positions of the optical scanning means, the improvement comprising:

  • a stationary, cylindrical-segment platen capable of providing a fingerprint object having ridge zones and valley zones, said platen having an upper surface capable of receiving, positioning, and supporting a finger and a lower surface adapted to receive an interrogating light beam, said upper surface having first anti-reflective means for providing said upper surface with image enhancement properties, a finger when positioned on said upper platen surface capable of modulating said interrogating light beam; and

    means for rotating said light source, said optical scanning means, said array, said lens means and at least one element of said electrical scanning means such that the axis of rotation of said optical scanning means is substantially the same as the axis of the upper surface of said cylindrical-segment platen;

    said optical scanning means scanning the circumference of said platen such that the angle of incidence of said interrogating light beam on the finger at the curved back surface of said platen is constant;

    said electrical scan being along the axis of said cylindrical-segment platen to thus generate a roll fingerprint image.

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