DEVICE FOR EVALUATING AUTHENTICITY FEATURES THAT HAVE A DIFFRACTION STRUCTURE

摘要

An apparatus for evaluating distinguishing authenticity features with diffraction structures on a document, which is placed on an examining surface of a examining device and illuminated by an illumination source, the distinguishing authenticity feature, which is to be examined, diffracting the beam of the illuminating source and projecting it on an evaluating unit in the device. In order to be independent of the nature and location of the diffraction pattern, which is to be evaluated, the diffraction pattern, derived from the document to be examined, is projected onto a projection surface. The projected diffraction image is covered and evaluated by a camera (matrix or cells).