Patent ID: 6863390

Claim:
An ink jet head unit, comprising: a head chip, having a front face formed with nozzle orifices, and a rear face formed with at least one ink inlet; and a damping chamber forming member, laminated on the rear face of the head chip, the damping chamber forming member having at least one damping chamber for dampening pressure fluctuation occurred therein, and at least one ink supply port, which supplies ink from the damping chamber to the head chip. wherein the damping chamber forming member includes: a base member, having a front face for mounting the head chip and a rear face formed with a plurality of recesses arranged in a direction parallel to the front face of the head-chip and associated with the ink supply port; and a damping film, laminated on the rear face of the base member such that the damping chamber is defined by the recess and the damping film, the damping film having at least one flexible portion capable of dampening the pressure fluctuation.