Patent ID: 8511800

Claim:
An inkjet head comprising: a substrate in which a plurality of groove parts are provided in parallel, open end sides of the respective groove parts communicating with pressure chambers; a nozzle plate which is bonded to open end faces of the pressure chambers by an adhesive, and includes nozzles for ejecting ink, each communicating with a respective one of the pressure chambers; a pressure generating unit configured to generate pressure in the pressure chambers to eject the ink through the nozzles; an ink supply unit configured to supply the ink into the pressure chambers; and electrode parts configured to drive the pressure generating unit, the electrode parts including (i) electrodes formed on inner surfaces of the groove parts, (ii) smoothed films that are formed on surfaces of the electrodes by a coating method, are made of an inorganic material and have an average surface roughness of 0.6 μm or less, and (iii) electrode protection films that are formed on surfaces of the smoothed films to have a thickness of 1.0 μm or more and are made of an inorganic material.