Patent ID: 7175245

Claim:
An ink-jet head comprising: a plurality of chambers each communicating with a nozzle opening and being supplied with ink, the chambers being arranged side by side in a piezoelectric ceramic plate; electrodes provided on both side walls of each of the chambers for supplying a voltage drive waveform to generate a drive electric field in the side walls for ejecting ink; and drive waveform generating means for selecting any one of a first drive waveform for ejecting an ink droplet from a nozzle opening and a second drive waveform for vibrating a meniscus of the ink to an extent that no ink droplet is ejected from the nozzle opening, based on recording data related to printing outputted from an external circuit, and outputting a voltage drive waveform to the electrodes, the drive waveform grenerating means comprising a driver circuit that outputs a drive waveform to the electrodes, a counter circuit that counts the number of ejection timing signals for controlling ink election from the nozzle opening, and an OR circuit that computes a logical OR of the recording data related to printing which is outputted from the external circuit and data outputted from the counter circuit and outputs a result to the driver circuit.