Patent ID: 7364273

Claim:
A liquid-jet head comprising: a passage-forming substrate in which a plurality of pressure generating chambers communicating with nozzle orifices ejecting a liquid are formed; piezoelectric elements which are provided in a region facing the pressure generating chambers on one side the passage-forming substrate with a vibration plate interposed therebetween and each of which includes a lower electrode, a piezoelectric layer and an upper electrode; a lead electrode for the upper electrode, which is drawn out from the upper electrode; and a lead electrode for the lower electrode, which is drawn out from the lower electrode, wherein the lower electrode is a common electrode which is continuously provided in the region facing the plurality of arranged pressure generating chambers, at least an end on one side of the lower electrode in a direction perpendicular to an arrangement direction of the pressure generating chambers is positioned in the region facing the pressure generating chambers, the lower electrode has a common lead portion which is drawn out to outside of a region corresponding to a space between the adjacent pressure generating chambers from the one end in the region corresponding to the space between the pressure generating chambers, the lead electrode for the lower electrode is electrically connected to the common lead portion of the lower electrode, and a connection portion between the lead electrode for the lower electrode and the common lead portion is positioned in a region outside of the region corresponding to the space between the pressure generating chambers.