Patent ID: 8602530

Claim:
An ink-jet head comprising: a nozzle plate having a plurality of nozzles; a vibrating plate arranged on the nozzle plate; a plurality of liquid chambers formed of spaces between the vibrating plate and the nozzle plate, the spaces being partitioned by division walls; a piezoelectric element composed of a common electrode, a piezoelectric body and an individual electrode layered in this order, the piezoelectric element being formed on a first surface of the vibrating plate opposite to a second surface thereof that forms the liquid chambers; a first insulator film having a first opening and a second insulator film having a second opening, the first insulator film and the second insulator film being layered in this order on the first surface having the piezoelectric element of the vibrating plate; a first wire drawn from the individual electrode via the first opening of the first insulator film and the second opening of the second insulator film; a third insulator film having a third opening, the third insulator film being formed on the first wire; and a second wire configured to electrically couple the first wire and a driving circuit, the second wire being drawn via the third opening of the third insulator film, wherein the third insulator film is formed in a first region of the second insulator film and is not formed in a second region thereof, the second region excluding a region including the first wire formed above the liquid chamber, and the first region of the second insulator film includes a film thickness of 100 nm or more, and the second region of the second insulator film includes a film thickness range of 5 to 40 nm, and wherein both of the first insulator film and the second insulator film are interposed throughout between the piezoelectric element and the first wire, except for portions occupied by the first opening and the second opening.