Patent ID: 8807678

Claim:
A method of driving an inkjet printing apparatus, comprising: applying an electrostatic driving voltage to an electrostatic force applying unit so as to exert an electrostatic force on ink in a nozzle of the inkjet printing apparatus; applying a piezoelectric driving voltage to a piezoelectric actuator after the application of the electrostatic driving voltage so as to exert pressure on the ink, thereby forming a dome-shaped ink meniscus at an outlet opening of the nozzle and ejecting ink droplets having a smaller size than the nozzle opening from a surface of the dome-shaped ink meniscus; and removing the piezoelectric driving voltage and the electrostatic driving voltage, wherein, at least part of a pulse of the piezoelectric driving voltage overlaps at least part of a pulse of the electrostatic driving voltage, an initial delay time from a peak value of the electrostatic pulse to a peak value of the piezoelectric pulse is greater than a final delay time from a removal of the piezoelectric pulse to a removal of the electrostatic pulse, and the piezoelectric pulse and the electrostatic pulse are associated with a same nozzle.