The ornamental design for a bar code Scanner using the Light Emitting Diode (LED), Optical Scanner assembly and Charge-Coupled Devices (CCD) capable of reading the barcode symbols at the variable distance, as shown and described. The optical passive elements for increasing the depth of field and method...http://www.google.de/patents/US5291009?utm_source=gb-gplus-sharePatent US5291009 - Optical scanning head
