Patent ID: 6793138
Filing Date: 2004-09-21
Classification: G06K

Abstract:
A reader for an information code having bars in a bar code display area, said reader comprising:a plurality of light sources, each of the light sources emitting a light with a color having a wavelength different from that of a light emitted from the other light source; a driving circuit for emitting a light beam from said light sources one after another in a sequential manner during a scanning time of said information code; a detector for detecting a reflected light from the bars in the bar code display area; a determination circuit for outputting a signal indicating characteristic of the reflected light based on the reflected lights detected by the detector, wherein the determination circuit determines whether or not the reflected light indicates a synchronized reflection or a desynchronized reflection with respect to each of the light beam emitted from the light sources and for outputting a signal indicating either one of synchronization and de-synchronization; and a decoder for determining a color of each of the bars in the bar code display area based on the output signal from the determination circuit to output a decoding result.