A bar code scanner employs a light source such as a laser for generating a light beam to be directed along a path toward a bar code symbol to be read. A scanner such as a mirror driven by a motor moves the light beam along a scan line across the bar code symbol. A sensor detects the intensity of reflected...http://www.google.com/patents/US5180904?utm_source=gb-gplus-sharePatent US5180904 - Bar code scanner with automatic de-activation of scan upon bar code recognition
