Patent ID: 7175262

Claim:
A liquid-jet head, comprising: a passage-forming substrate in which a pressure generating chamber communicating with a nozzle orifice is defined; and a piezoelectric element which includes a lower electrode, a piezoelectric layer and an upper electrode and is provided on the passage-forming substrate with a vibration plate interposed therebetween, wherein the piezoelectric element is made of a thin film directly formed on the vibration plate without an adhesive agent interposed therebetween by deposition and a lithography method; on a surface of the passage-forming substrate, the surface facing the piezoelectric element, a junction plate is joined onto a draw-out wiring drawn out of the piezoelectric element with an insulating adhesive agent interposed therebetween; and only a side face of the piezoelectric element is covered with an adhesion layer made of an adhesive agent joining the junction plate so as not to expose at least the piezoelectric layer.