Patent ID: 7334873

Claim:
A printhead chip for an inkjet printhead, the printhead chip comprising: a substrate; and a plurality of nozzle arrangements that is positioned on the substrate, each nozzle arrangement comprising: nozzle chamber walls positioned on the substrate and a roof that define a nozzle chamber with the roof defining an ink ejection port in fluid communication with the nozzle chamber; an ink-ejecting member that is positioned in the nozzle chamber, the ink-ejecting member being displaceable towards and away from the ink ejection port so that a resultant fluctuation in ink pressure within the nozzle chamber results in an ejection of ink from the ink ejection port; at least one work-transmitting structure that is displaceable with respect to the substrate and is connected to the ink-ejecting member so that displacement of the work transmitting structure results in displacement of the ink-ejecting member; an actuator that is connected to the work-transmitting structure, the actuator being capable of displacing the work transmitting structure upon receipt of an electrical drive signal; and air chamber walls and a covering formation that is positioned over the actuator, the air chamber walls and the covering formation defining an air chamber in which the actuator is positioned, the roof, the work transmitting structure and the covering formation together defining a protective structure positioned in a common plane, wherein, the covering formation and the work transmitting structure are demarcated by a first opening in fluid communication with the air chamber, and the roof and the work transmitting structure are demarcated by a second opening in fluid communication with the nozzle chamber.