Patent ID: 7571993

Claim:
An ink-jet head comprising: a piezoelectric actuator comprising a piezoelectric layer, a plurality of individual electrodes respectively corresponding to ink ejection channels and formed on a surface of the piezoelectric layer, a plurality of lands formed on the surface of the piezoelectric layer or the surface of the individual electrodes so as to be electrically connected to the respective individual electrodes, and a common electrode opposed to the individual electrodes with the piezoelectric layer being interposed therebetween; a wiring board comprising a plurality of terminals respectively corresponding to the plurality of lands, and a plurality of wirings respectively corresponding to the plurality of terminals; and a conductive member providing electrical connection between the individual electrodes of the piezoelectric actuator and the terminals of the wiring board via the plurality of lands, wherein a height of each of the plurality of lands from the surface of the piezoelectric layer is larger than a height of the individual electrode from the surface of the piezoelectric layer, each of the plurality of lands has a hole opening in its top face which is remote from the piezoelectric layer, and an inner surface of the hole opening of each land contains at least a portion of the conductive member, and each of the plurality of terminals formed on the wiring board is physically and electrically connected to a corresponding one of the plurality of lands of the piezoelectric actuator, through the conductive member at the top of the corresponding one of the plurality of lands, and the conductive member is positioned in the hole opening of the corresponding one of the plurality of lands.