Discrete air and nozzle chambers in a printhead chip for an inkjet printhead

摘要

A printhead chip for an inkjet printhead includes a plurality of nozzle arrangements on a substrate ( 12 ). Each nozzle arrangement ( 10 ) includes nozzle chamber walls ( 18 ) and a roof ( 20 ) that define a nozzle chamber ( 22 ) with the roof defining an ink ejection port ( 30 ) in fluid communication with the nozzle chamber. An ink-ejecting member or paddle ( 54 ) is positioned in the nozzle chamber and 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 ( 30 ). At least one work transmitting structure of a lever mechanism ( 38 ) is displaceable with respect to the substrate results in displacement of the ink-ejecting member. A thermal bend actuator ( 62 ) is capable of displacing the structure upon receipt of an electrical drive signal ( 14 ). An air chamber ( 80 ) defined by walls ( 90 ) and a covering formation ( 78 ) are positioned over the actuator to protect the component from ingress of microscopic detritus such as paper dust.