Patent ID: 6141113
Filing Date: 2000-10-31
Classification: B41J

Abstract:
An ink droplet ejection drive method comprising the steps of:applying an emission pulse for changing a volume of an ink channel to the ink channel filled with ink so that the ink channel is expanded in volume to generate a pressure wave in the ink channel; anddecreasing an expanded volume of the ink channel to a normal state thereof to apply pressure to ink in the ink channel for ejecting a droplet of ink after a lapse of time approximately corresponding to one of one-way propagation time T of the pressure wave in the ink channel and an approximate odd-numbered multiple of T,wherein, after a plurality of ink droplets are ejected in response to a plurality of ink emission pulses for each one-dot print instruction, an ink nonemission pulse for nonejection of ink droplets, which has a time width ranging from approximately 0.3 T to 0.7 T or 1.3 T to 1.8 T is applied with a time period of approximately 2.35 T to 2.65 T between an end time of the last one of the plural emission pulses and an intermediate time corresponding to a midpoint between a start time and an end time of the nonemission pulse.