Patent ID: 7008048
Filing Date: 2006-03-07
Classification: B41J

Abstract:
1. An ink-jet head comprising: a passage unit including a plurality of pressure chambers each having one end coupled to a nozzle and the other end being able to be coupled to an ink supply source, the plurality of pressure chambers being arranged in a matrix to neighbor each other; and an actuator unit attached to a surface of the passage unit for changing the volume of each of the pressure chambers, the actuator unit comprising: a plurality of deformable sheets including plurality of piezoelectric sheets disposed to continuously extend over the chambers, wherein an uppermost piezoelectric sheet is an active layer that is deformed when an external electric field is applied; a common electrode disposed on one side of the uppermost piezoelectric sheet, the common electrode kept at a constant potential; a plurality of individual electrodes disposed on the other side of the uppermost piezoelectric sheet at positions respectively corresponding to the pressure chambers; and recesses formed in regions of the uppermost piezoelectric sheet corresponding to portions between the pressure chambers, wherein the recesses suppress a deformation that propagates in a plane direction of the uppermost piezoelectric sheet.