Patent ID: 7086711
Filing Date: 2006-08-08
Classification: B41J

Abstract:
1. An inkjet printing apparatus comprising: a plurality of pressure chambers each having one end connected to a nozzle; an actuator that can take two states of a first state wherein the volume of a pressure chamber is V an actuator controller for supplying a voltage pulse to the actuator to change a state of the actuator from the first state to the second state and then to the first state again so that two separate ink droplets consisting of a main droplet and a satellite droplet smaller than the main droplet are successively ejected through the nozzle, a pulse width Tw of the voltage pulse during the second state being shorter than a pulse width Tmax at which a maximum ejection speed of ink ejected from the nozzle is obtained, wherein the two separate ink droplets are ejected whenever the state of the actuator is changed from the second state to the first state.