Patent ID: 8662645

Claim:
An inkjet head comprising: a substrate which is formed of a piezoelectric material, the substrate including a plurality of grooves that are arranged at intervals; a nozzle plate which is fixed onto the substrate by an adhesive, the nozzle plate including a plurality of nozzles that are formed by laser processing to communicate with the grooves; a plurality of electrodes to which a driving voltage that deforms the grooves is applied, each of the electrodes being formed of a plurality of metal layers that are superposed to cover internal surfaces of the grooves, and including a flat surface that is apart from the internal surfaces of the grooves, the metal layers include a copper layer, the copper layer has a two-layer structure which includes an electroless copper plating layer that is formed on the internal surfaces of the grooves, and an electrolytic copper plating layer that is formed on the electroless copper plating layer; a first inorganic film which is superposed on the electrodes to cover the surfaces of the electrodes; and a second inorganic film which is superposed on the first inorganic film, the second inorganic film being soaked in ink that is supplied to the grooves.