Patent ID: 7766458

Claim:
An inkjet head comprising: an ink passage unit including a plurality of pressure chambers and a plurality of wall portions defining each of the plurality of pressure chambers; an actuator unit including a piezoelectric element disposed on the ink passage unit, a surface electrode disposed on the piezoelectric element and having a main electrode portion opposed to a pressure chamber of the plurality of pressure chambers and a connecting portion opposed to a wall portion of the plurality of wall portions defining each of the plurality of pressure chambers of the ink passage unit, and a land disposed on the piezoelectric element in a region opposed to the wall portion, the land being electrically connected to the surface electrode; a printed circuit board on which a terminal electrically connected to the land and a predetermined wiring pattern are provided; a metallic bond for electrically connecting the land to the terminal, the metallic bond being disposed in at least one of a region between the land and the terminal and a region extending over the land and the terminal along the peripheries of the land and the terminal; and a protrusion disposed on the connecting portion between the main electrode portion and the land, wherein: the protrusion is provided for the land and the terminal that are electrically connected to form one land and terminal pair, and the protrusion is independent of another protrusion provided for another land and terminal pair that are electrically connected, and a space provided by a region opposed to the pressure chamber exists between the one land and terminal pair and the another land and terminal pair.