A bar code reader capable of working over a wider range of working angle and for a wider range of bar code densities, using improved optics and sensing elements. The optics and sensing elements and/or the associated circuitry are arranged to provide two channels of data derived from the scanned bar code....http://www.google.es/patents/US5506392?utm_source=gb-gplus-sharePatente US5506392 - Photodetector for use in reading optical information symbols
Photodetector for use in reading optical information symbols
