Patent ID: 7438403
Filing Date: 2008-10-21
Classification: B41J

Abstract:
1. An inkjet printhead comprising: a cavity unit having: an actuator unit superposed on the cavity unit to selectively pressurize the ink in each of the pressure chambers to eject a droplet of the ink from the nozzle corresponding to the pressure chamber; the common ink chamber extending along the row of the pressure chambers so as to overlap at least a part of each pressure chamber when seen in a direction of superposition of the cavity unit and the actuator unit; and a compensating member constituted by a material having a rigidity lower than that of a material of the common-chamber member, and disposed in the common ink chamber and in contact with the ink, at at least a remote portion far from the at least one ink introduction place, so that a cross-sectional area of the common ink chamber perpendicular to the longitudinal direction thereof gradually decreases at least at the remote portion in a direction away from each of the at least one ink introduction place, a cross-sectional area of the compensating member increases as the cross-sectional area of the common ink chamber decreases, and a supporting rigidity of the common-chamber member with respect to the pressure chambers is substantially uniform across a region corresponding to the row of the pressure chambers, along the direction of the row of the pressure chambers.