Patent ID: 6361149
Filing Date: 2002-03-26
Classification: B41J

Abstract:
An ink jet head comprising:a nozzle plate having a nozzle hole; an ink chamber substrate provided on a back of the nozzle plate, the ink chamber substrate including an integral unitary member having an oscillation plate and a pressure chamber, the pressure chamber containing ink and communicating with the nozzle hole, and the oscillation plate defining a bottom of the pressure chamber; a counter electrode substrate having an electrically isolated counter electrode, the counter electrode facing the oscillation plate via a gap between the oscillation plate and the counter electrode; a dielectric layer interposed between the ink chamber substrate and the counter electrode substrate, the dielectric layer formed in a pattern that separates the counter electrode substrate and the ink chamber substrate, thereby providing a space that defines the gap between the oscillation plate and the counter electrode; and a pad metal piece in direct electrical contact with a surface of the counter electrode, the pad metal piece being arranged such that a driving voltage externally applied from the pad metal piece to the counter electrode actuates the oscillation plate to impart a stress on the ink within the pressure chamber.