Patent ID: 6467886
Filing Date: 2002-10-22
Classification: B41J

Abstract:
An ink jet head comprising:a head main body including a hollow as a pressure room having an inlet for ink supply and an outlet for ink discharge, and a nozzle leading to the outlet; and a piezoelectric actuator which is arranged to block said hollow and make up the pressure room together with said hollow and which includes a piezoelectric element, a first electrode arranged on a surface of the piezoelectric element that is opposite to a pressure room side, and a second electrode arranged on other surface of the piezoelectric element that is on the pressure room side, said piezoelectric actuator making the pressure room deform to decrease its capacity by applying a voltage onto the piezoelectric element via the first electrode and the second electrode, thereby discharging ink contained inside the pressure room through the outlet, wherein a crack covering member made from an electric insulating material is arranged on a surface of said piezoelectric actuator that is on a second electrode side in such a manner as to fill said electric insulating material into a crack which is open on a surface of the piezoelectric element that is on the second electrode side.