Patent ID: 7147297

Claim:
An ink jet nozzle arrangement for ejecting ink, the ink jet nozzle arrangement comprising: a substrate that defines an ink inlet; integrated circuitry positioned on the substrate; a nozzle chamber structure positioned on the substrate and defining a nozzle chamber in fluid communication with the ink inlet and an ink ejection port in fluid communication with the nozzle chamber from which ink is ejected; a paddle positioned in the nozzle chamber and arranged to move in the nozzle chamber to thereby eject ink from the nozzle; an elongate actuator connected at one end to the substrate to receive actuating pulses from the integrated circuitry and to the paddle at the other end so that, on receipt of said actuating pulses, the actuator and thus the paddle is moved reciprocally to eject the ink from the ink ejection port; and a movement sensor arranged on the actuator and the substrate to determine one of a degree and a rate of movement of the actuator.