Scanning device for optically scanning symbol codes, such as bar codes, the device comprising a laser source for producing a scanning beam, a first lens for focussing the scanning beam, a detector for detecting light backscattered by the scanned symbol codes, a second lens for focussing the backscattered...http://www.google.fr/patents/US5272325?utm_source=gb-gplus-shareBrevet US5272325 - Scanning device for symbol codes
