Patent ID: 8292409

Claim:
An ink jet head comprising: a head chip which comprises a drive wall and a channel juxtaposed alternately, an outlet and an inlet of the channel being arranged respectively at a front surface and a rear surface of the chip, and a drive electrode formed on the drive wall; a nozzle plate provided with a nozzle for ejecting ink, at a corresponding position to the channel on the front surface of the head chip; a connection electrode to electrically connect to the drive electrode, formed on the rear surface of the head chip; and a wiring board on which an electrode portion is formed for applying a voltage from a drive circuit to the drive electrode via the connection electrode, the wiring board being bonded to project from the head chip in a direction perpendicular to a channel array direction, wherein the ink jet head ejects the ink in the channel from the nozzle by applying the voltage to the drive electrode to cause a shear deformation on the drive wall, the ink jet head characterizing in further comprising: a holding member disposed at a position covering the electrode portion to hold a portion of the wiring board projecting from the head chip; and an electrode portion protection member bonded between the holding member and the electrode portion by using adhesive, and having a thickness in the range of 0.01 mm-0.5 mm at a part covering the electrode portion.