Patent ID: 7445314

Claim:
A piezoelectric ink-jet printhead, comprising: a flow path plate having an ink flow path including a plurality of pressure chambers to be filled with ink to be ejected; a piezoelectric actuator formed on an upper surface of the flow path plate and for supplying a driving force for ink ejection to the plurality of pressure chambers; a nozzle plate having an upper surface and a lower surface, the upper surface of the nozzle plate bonded to a lower surface of the flow path plate including a plurality of nozzles for ejecting ink from the plurality of pressure chambers through the nozzle plate; a heater formed on the lower surface of the nozzle plate, the heater adapted to heat ink in the ink flow path; an insulating layer between the lower surface of the nozzle plate and the heater, the heater being formed in a predetermined pattern on a surface of the insulating layer; a protection layer for protecting the heater formed on the insulating layer and the heater; bonding pads for bonding a power supply line formed at ends of the heater; and contact holes through the protection layer for exposing the bonding pads.