Patent ID: 6196462
Filing Date: 2001-03-06
Classification: G06K

Abstract:
Optical device for reading and decoding bars of different reflectivity arranged in accordance with a barcode and adjoining one another, comprising an optical scanning device for scanning the bars by means of a light beam, a sensor for receiving the reflected light beam and the conversion thereof into an electrical sensor output signal, a transition detector for detecting the level transitions in the sensor output signal and a decoding device which decodes the scanned barcode on the basis of the output signals from the transition detector, characterised in that the transition detector is provided with a comparator (2) and a flipflop (3) connected to the output thereof, the sensor output signal being fed to one of the inputs of the comparator and the output of the flipflop being coupled via one or more first integrators (4) to the other input of the comparator, one or more second integrators (5) connected to the output of the flipflop and a device (6), connected to said second integrators, for determining the positions of the transitions in the barcode.