Patent ID: 7976132

Claim:
A nozzle assembly for an inkjet printhead, said nozzle assembly comprising: a nozzle chamber having a roof and a floor, said roof having a moving portion moveable relative to a static portion and a nozzle opening defined in said roof, such that movement of said moving portion relative to said static portion causes ejection of ink through the nozzle opening; a thermal bend actuator defining at least part of said moving portion, said actuator comprising: an upper active beam for connection to drive circuitry; and a lower passive beam fused to a lower surface of the upper beam element, such that when a current is passed through the active beam, the active beam expands relative to the passive beam, resulting in bending of the actuator towards the floor; and a polymeric material covering said moving portion and said static portion, wherein said polymeric material is selected from the group consisting of: polymerized siloxanes, and wherein said static portion and said lower passive beam are both comprised of silicon dioxide.