US Patent 7267416 Ink drop ejection method and ink drop ejection device

A method of ejecting ink drops for a printing device having a plurality of nozzle arrays each including a plurality of nozzles arranged in line includes the steps of (1) delaying a timing at which the ejection pulse signals are applied for the nozzles of the nozzle arrays other than those of a reference nozzle array which is predetermined one of the plurality of nozzle arrays with respect to a timing at which the ejection pulse signals are applied for the nozzles of the reference nozzle array, and (2) delaying a timing at which the ejection pulse signals are applied for the nozzles which are to eject relatively small amount of ink drops with respect to a timing at which the ejection pulse signals are applied for the nozzles which are to eject relatively large amount of ink drops for each nozzle array.