Patent ID: 8208133
Filing Date: 2012-06-26
Classification: G07D

Abstract:
1. A banknote verification device comprising: a plurality of radiation sources of at least one wavelength; a plurality of radiation receivers disposed on an opposite side of a banknote being verified; a beam waveguide placed between the radiation sources and the banknote being verified, the beam waveguide providing light transmission from the radiation sources to a surface of the banknote, the beam waveguide shaped as a four-sided prism with a trapezoidal base; one of parallel lateral side faces of the beam waveguide, serving as an input face for radiation, is oriented towards the radiation sources while an opposite output face is oriented towards the surface of the banknote, all other side faces being light reflecting; wherein the radiation sources are symmetrically disposed along the input face side of the beam waveguide having an equal spacing (S) distance therebetween, such that sections of the output face side illuminated by adjacent radiation sources overlap; wherein a first radiation source and a last radiation source are installed at a distance from an edge that is equal to half of the spacing (S) distance.