Patent ID: 7170648
Filing Date: 2007-01-30
Classification: B41F

Abstract:
1. A scanning device for scanning register marks printed on a substrate, the device comprising; at least one light source illuminating a lighting area on the substrate, the lighting area being an area on the substrate crossed by the register marks; the at least one light source that illuminates the substrate at the lighting area includes means for effecting at least one modulation of at least one of intensity and color of the illuminating light during simultaneous or sequential scanning of at least two of the register marks; a photosensitive element comprised of a plurality of pixels for receiving traveling images of the register marks wherein the traveling images are projected on a photosensitive element having a plurality of scanning portions that are successively scanned according to a predetermined scanning rate and the pixels produce electric pulses; a microprocessor connected with the at least one light source for controlling the lighting and comprising partly the means for effecting at least one modulation of the light source and for controlling the electric pulses produced by the pixels.