Patent ID: 6419155
Filing Date: 2002-07-16
Classification: G06K

Abstract:
A laser beam scanning bar code reader comprising:barcode reading means for driving a scan mirror to irradiate a laser beam on a selected one of a barcode and a pair of spaced marks, for receiving a reflected beam from the selected one of the barcode and the pair of marks, and for reading the selected one of the barcode and pair of marks; detecting means, responsive to said barcode reading means reading the pair of marks, for detecting the start and stop positions of the laser beam irradiation determined by the pair of marks; setting means for setting therein as scan span control information the start and stop positions detected by said detecting means; and laser beam irradiation driving means for controlling the turning on/off of the laser beam in one scan period based on the start and stop positions set as the scan span control information in reading the barcode to thereby control the actual scan span in which the laser beam is on in the one scan period based on the start and stop positions of the laser beam irradiation determined by the pair of marks.