Ink jet printhead incorporating a backflow prevention mechanism

摘要

An ink jet printhead includes a substrate. A plurality of nozzle arrangements are arranged on the substrate. Each nozzle arrangement has side walls and a roof wall that define a nozzle chamber and an inlet in fluid communication with the nozzle chamber. An actuator is provided that includes an ink ejection mechanism. The actuator is operable to activate the ink ejection mechanism so that the ink ejection mechanism is displaceable between a quiescent condition and an operative condition such that ink is ejected from the nozzle chamber while the ink ejection mechanism is so displaced. The ink ejection mechanism is configured so that the ink ejection mechanism serves to obstruct a flow path from the nozzle chamber and into the inlet at at least one position between and including the quiescent and operative conditions.