Patent ID: 8662278
Filing Date: 2014-03-04
Classification: G07D,H04N

Abstract:
1. A sensor for checking a value document which, for checking the value document, is present in a measuring plane, comprising: an illumination device illuminating a region of the measuring plane, and comprising a multiplicity of different light sources which are arranged side by side and whose emission spectra differ from each other, and a microlens array with a multiplicity of microlenses, wherein the microlens array and the light sources are arranged relative to each other so that with each of the light sources there is associated exactly one of the microlenses, so that the emission light emitted by the light source is collectable by the microlens associated with the light source, and an imaging optic, by which the light of the different light sources emitted by the illumination device is imaged onto the illuminated region of the measuring plane, wherein the measuring plane lies so close to a focal point of the imaging optic that the light of the different light sources emitted by the illumination device is imaged largely onto the same illuminated region of the measuring plane, and a detection device arranged to detect light which, upon checking the value document, when the illuminated region is an illuminated region of the value document, emanates from the illuminated region.