Importance

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Abstract

A printhead chip for an inkjet printhead includes a substrate. A plurality of nozzle arrangements is positioned on the substrate. Each nozzle arrangement includes nozzle chamber walls 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 is positioned in the nozzle chamber. The ink-ejecting member is 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 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 is connected to the work-transmitting structure. The actuator is capable of displacing the work transmitting structure upon receipt of an electrical drive signal. Air chamber walls and a covering formation are 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 define a protective structure positioned in a common plane.

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First Claim