Patents Assigned to Identigrade
  • Patent number: 5133019
    Abstract: Systems and methods for illuminating an object surface with light at varying angles of incidence and for optically evaluating the object surface for features and defects, etc. are disclosed. In a specific implementation the systems and methods, the target object comprises a coin and the illumination and evaluation techniques are used to accurately objectively evaluate the numismatic quality of the coin and/or identify the coin. Central to the illumination and evaluation techniques is the ability to apply a uniform confined beam of light to the surface of the target object to be imaged. The confined angles of incidence of the beam of light includes a perpendicular component angle of incidence range and a parallel component angle of incidence range relative to the object surface. The component ranges are defined such a light beam illuminates the object surface from a well-defined direction.
    Type: Grant
    Filed: February 1, 1990
    Date of Patent: July 21, 1992
    Assignee: Identigrade
    Inventors: Henry A. Merton, James R. Diefenthal, William D. Radigan, Soumitra Sengupta, Emmett J. Lenaz, Jr.