Patent ID: 8016387

Claim:
An ink jet head having a head chip, the head chip comprising: a plurality of driving walls made up of a piezoelectric device arranged in parallel with a predetermined distance; a plurality of ink channels that eject ink, sandwiched by the driving walls, having opening parts of the channels on a front surface and on a rear surface of the head chip; a plurality of air channels that do not eject ink, sandwiched by the driving walls, having opening parts of the channels on a front surface and on a rear surface of the head chip; a plurality of driving electrodes formed inside of the plurality of ink channels and the plurality of air channels, that causes shear deformation of the driving walls by applying a voltage; at least one common electrode that conducts with the driving electrodes of the air channels; and a plurality of connection electrodes formed at the rear surface of the head chip that conduct with the driving electrodes of the ink channels separately, wherein the ink channels and the air channels are alternatingly arranged in parallel and form a plurality of channel rows arranged in parallel; and the ink head further having a nozzle plate joined to a front surface of the head chip that closes the opening parts of the air channels on the front surface and has a plurality of nozzles at the opening parts of the ink channels on the front surface, wherein individual connection electrodes of any adjacent two channel rows formed at a side of an edge of the rear surface of the head chip among the plurality of channel rows are parallely aligned at the edge of the rear surface of the head chip.