Patent ID: 7198359

Claim:
An inkjet head comprising: a channel unit having a flat shape, the channel unit having a plurality of pressure chambers arranged adjacent to one another in a plane perpendicular to a thickness direction of the channel unit, and a plurality of nozzles provided on a first surface of the channel unit and being in communication with the plurality of pressure chambers, each of the plurality of pressure chambers having a volume; and an actuator unit fixed to a second surface of the channel unit for changing the volume of each of the plurality of the pressure chambers; the actuator unit comprising: a plurality of individual electrodes provided, opposed to the plurality of pressure chambers, respectively, each of the plurality of individual electrodes receiving a drive signal to change the volume of corresponding one of the pressure chambers; a common electrode provided over the plurality of pressure chambers; a piezoelectric sheet provided between the plurality of the individual electrodes and the common electrode; and an independent electrode provided between adjacent individual electrodes on a non-opposing portion of the piezoelectric sheet that is not opposed to the pressure chambers, the independent electrode being physically isolated from the common electrode and the plurality of individual electrodes; and the inkjet head further comprising: an inductor electrically connected between the independent electrode and a portion whose electric potential is substantially a same as that of the common electrode.