Nozzle arrangement for an ink jet printhead that includes a shape memory actuator

An ink jet printhead that comprises:

• a wafer substrate;
• and
• at least one nozzle arrangement positioned on the wafer substrate, the, or each, nozzle arrangement comprising:
• nozzle chamber walls arranged on the wafer substrate to define a nozzle chamber of the nozzle arrangement and an ink ejection port in fluid communication with the nozzle chamber, the nozzle chamber walls being the product of a deposition and etching process carried out on the wafer substrate;
• and
• an actuator for ejecting ink from the nozzle chamber, the actuator comprising:
• at least one actuating member that is displaceable between pre-operative and post-operative positions with respect to the nozzle chamber walls to eject ink from the ink ejection port, at least a portion of, the, or each, actuating member being in the form of a shape memory material which is capable of generating said displacement of the, or each, actuating member when the shape memory material undergoes a structural change to or from a trained shape under predetermined conditions;
• and
• a transformation mechanism that is operatively arranged with respect to the shape memory material to generate said predetermined conditions.