Patent ID: 7425058

Claim:
A multi-nozzle ink jet head having a plurality of nozzles and a plurality of pressure chambers, comprising: a nozzle member in which is formed said plurality of nozzles; a pressure chamber wall member, which is a resin, in which is formed said plurality of pressure chambers; piezoelectric type actuators for applying pressure to each of said plurality of pressure chambers for ejecting ink from said nozzles; and a reinforcing coating member, constituted from a metal or a ceramic material, that is provided on surfaces of said pressure chamber wall member facing said pressure chambers and reinforces said pressure chamber wall member, wherein that said piezoelectric type actuators have piezo elements and a diaphragm; and said diaphragm is constituted from the said reinforcing coating member; and the thickness of said reinforcing coating member constituting said diaphragm is thinner than the thickness of said reinforcing coating member covering said pressure chamber wall member.