Patent ID: 7503642

Claim:
An inkjet head comprising: a channel unit which includes a plurality of pressure chambers communicating with nozzles respectively and arrayed in a plane, and ink channels extending from ink inlets to the nozzles through the pressure chambers respectively; an actuator unit fixed to one surface of the channel unit, the actuator unit changing volumes of the pressure chambers in accordance with deformation of a piezoelectric sheet, the actuator unit including: individual electrodes corresponding to the pressure chambers and having lands at which terminals of a flexible cable are electrically connected to the individual electrodes to supply driving signals; a common electrode disposed over the individual electrodes; and at least one piezoelectric sheet disposed between the common electrode and the individual electrodes, wherein: the lands of the individual electrodes are overlapped with corresponding pressure chambers respectively as viewed in a direction perpendicular to the plane, each of the individual electrodes includes a primary electrode and a secondary electrode which is contiguous to the primary electrode by a constriction, an area of the primary electrode is larger than an area of the secondary electrode and the land that is located within the secondary electrode, both the primary electrode and the secondary electrode are entirely positioned within the corresponding pressure chambers respectively as viewed in the direction perpendicular to the plane, and the lands are entirely overlapped with corresponding pressure chambers respectively as viewed in the direction perpendicular to the plane.