Patent ID: 7131718

Claim:
An inkjet head comprising: a nozzle plate formed with a plurality of nozzles through which ink droplets are ejected; a channel plate formed with a plurality of pressure chambers corresponding to the respective nozzles; a diaphragm plate that has a diaphragm, the diaphragm sealing the pressure chambers; a plurality of piezoelectric elements attached to the diaphragm at positions opposite the respective pressure chambers; and a housing that houses the plurality of piezoelectric elements, wherein the housing has a central opening, and wherein: the housing has a protrusion in contact with the diaphragm plate, the protrusion being formed with opening grooves and having projecting parts, each of the opening grooves being defined between adjacent two of the projecting parts, wherein the projecting parts bridge across the central opening; and each of the piezoelectric elements is inserted in the corresponding one of the opening grooves.