Patent ID: 6986565

Claim:
An inkjet head, comprising: a plurality of pressure chambers, each of which being configured such that an end thereof is connected to a discharging nozzle and the other end is connected to an ink supplier; and an actuator unit for the plurality of pressure chambers, the actuator unit being a unimorph type actuator unit and being formed to be a continuous planar layer, said planar layer being arranged to cover said plurality of pressure chambers, said actuator unit including at least one inactive layer formed of piezoelectric material and arranged on a pressure chamber side, one of said at least one active layer being formed on a surface of the actuator unit that is proximal to the pressure chambers, said actuator unit having no inactive layer formed of piezoelectric material on a surface of the actuator unit that is distal from the pressure chambers, said actuator unit including at least one active layer formed of piezoelectric material and arranged on a side opposite to said pressure chamber side with respect to said inactive layer, said at least one active layer being sandwiched between a common electrode and a plurality of driving electrodes arranged at positions corresponding to said plurality of pressure chambers, said at least one active layer having a polarization direction substantially parallel with a thickness direction of said at least one active layer, said common electrode and said plurality of driving electrodes providing an electrical field in a direction substantially parallel with the polarization direction when the actuator unit is actuated, wherein said continuous planar layer includes a plurality of said at least one active layers and/or a plurality of said at least one inactive layers, and wherein one of said at least one active layer, having the polarization direction with which the direction of the electrical field is substantially parallel, is an immediate-neighboring piezoelectric layer to one of said at least one inactive layer.