Patent ID: 6979077

Claim:
An ink-jet head comprising: a passage unit including a plurality of pressure chambers each having one end connected with a nozzle and the other end to be connected with an ink supply source, the plurality of pressure chambers being arranged along a plane so as to neighbor each other with two or more pressure chambers communicating with one nozzle; and a unimorph type actuator unit fixed to a surface of the passage unit and extending over the pressure chambers for changing the volume of each of the pressure chambers, the actuator comprising an inactive piezoelectric sheet fixed to the surface of the passage unit and extending over the plurality of pressure chambers, wherein the actuator unit comprises: a common electrode that is common to the plurality of pressure chambers; a plurality of individual electrodes disposed at positions respectively corresponding to the plurality of pressure chambers; and one or more piezoelectric sheets, each of the one or more piezoelectric sheets extending over the plurality of pressure chambers, and each of the one or more piezoelectric sheets sandwiched by the common electrode and at least one of the individual electrodes; and wherein the inactive piezoelectric sheet does not contact the plurality of individual electrodes.