Device and method for ejecting ink droplet

An ink droplet ejection device comprising:

• a plurality of nozzles;
• a plurality of pressure chambers held in communication with the respective nozzles;
• a plurality of actuators each operable to apply an ejection pressure to an ink stored in a corresponding one of said pressure chambers, for causing an ink ejection from said corresponding one of said pressure chambers through one of said nozzles that is held in communication with said corresponding pressure chamber, whereby an image formed as a result of the ink ejection is produced on a medium;
• and
• a controller operable to supply a control signal to each of said plurality of actuators, and incorporating a drive pulse train into said control signal for causing ejection of at least two cooperative ink droplets that cooperate with each other to form one dot of the image produced on the medium,
• wherein said drive pulse train includes at least one main drive pulse and at least one complementary drive pulse following said at least one main drive pulse, for causing ejection of said at least two cooperative ink droplets in the form of at least one main ink droplets and at least one complementary ink droplet each of which has a volume smaller than a volume of each of said at least one main ink droplet,
• and wherein each of said at least one complementary drive pulse has a pulse width that is adjusted to cause the volume of each of said at least one complementary ink droplet to be smaller than the volume of each of said at least one main ink droplet and to cancel a residual pressure wave generated by each of said at least one main drive pulse.