Patent ID: 7500734

Claim:
An inkjet recording head comprising: an ink flow path; and a plurality of ejectors which are connected to the ink flow path, each ejector including a pressure chamber, a nozzle, and a single actuator which includes a plurality of individual electrodes and a deformable internal space of the pressure chamber in order to discharge ink, wherein each individual electrode has a surface area of approximately one-fourth the surface area of the actuator and is provided in one of an upper left side, lower left side, upper right side, and lower right side of the actuator, wherein alternating current voltages, whose phases differ in time, are applied respectively to the individual electrodes such that the actuator is driven and controlled so as to simultaneously vibrate a plurality of resonance modes with phases thereof offset in time and an ink rotational flow is generated within the pressure chamber due to the simultaneous vibration, and wherein a speed of the ink rotational flow is controlled by setting the periods of electric signals of the alternating current voltages.