Patent ID: 7540084

Claim:
A method for manufacturing a plurality of ink-jet heads each head including a channel unit having a laminate of a plurality of metal plates, the laminate forming an ink channel including a plurality of pressure chambers communicating with nozzles, and a piezoelectric actuator which varies a volume of the pressure chambers, the method comprising: a step of providing a plurality of metal plate sets each of which includes the plurality of metal plates forming the laminate; an insulating ceramic layer-formation step of forming an insulating ceramic layer at least on one of outermost metal plates of at least one set of the metal plate sets, the outermost metal plates forming outermost layers of the laminate; a stacking step of stacking the plurality of metal plate sets via the insulating ceramic layer of the at least one set; and a bonding step of heating the stacked plurality of metal plate sets and simultaneously diffusion bonding the plurality of metal plates belonging to each of the plurality of metal plate sets.