Patent ID: 7938510

Claim:
A liquid ejection apparatus comprising: a liquid ejection head to eject liquid having: an insulating nozzle plate provided with a nozzle having, a liquid supply port to supply liquid and an ejection port to eject the liquid supplied from the liquid supply port onto a substrate; and a cavity in communication with the liquid supply port to reserve the liquid to be ejected from the ejection port; an electrostatic voltage application device to generate an electrostatic attraction force by applying the electrostatic voltage between the liquid in the nozzle and in the cavity, and substrate; and a control device to control application of the electrostatic voltage through the electrostatic voltage application device; wherein the nozzle is a flat nozzle not protruding from the nozzle plate and the control device controls the electrostatic voltage application device so as to eject the liquid from the nozzle by applying a bipolar pulse which alternates between negative and positive polarities wherein and the bipolar pulse is a bipolar pulse in which an integrated value of the electrostatic voltage value of the positive pulse with respect to pulse time is equated to an integrated value of the electrostatic voltage value of the negative pulse with respect to pulse time.