Method for controlling the operation of an optical scanner

Details Method for controlling the operation of an optical scanner Method for controlling the operation of an optical scanner

G - Physics

06

K

354/55, 352/53.7

G06K 9/82 (2006.01) G06K 7/10 (2006.01)

Patent

CA 1173964

METHOD FOR CONTROLLING THE OPERATION OF AN OPTICAL SCANNER Abstract An optical scanner in a retail store checkout stand includes a single item detector upstream of the scanner window. Output signals from the item detector and from symbol recognition logic are used to open and close a shutter in the beam path of the scanner laser. The shutter is opened and a first time out sequence is started when the beam path is interrupted. A second, short time out sequence is restarted each time a valid symbol is recognized. A third time out sequence of intermediate length supersedes the first time out sequence when the beam path is cleared. The laser shutter is closed and the symbol is transferred to a terminal or controller upon the completion of and active time out sequence or upon recognition of a predetermined number of identical symbols, whichever comes first.

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