Patent ID: 7240992

Claim:
An ink jet printhead which comprises a substrate that defines a plurality of ink inlets; a drive circuitry layer positioned on the substrate; and a plurality of nozzle arrangements arranged on the substrate, each nozzle arrangement comprising a nozzle chamber structure positioned on the substrate and defining a nozzle chamber in fluid communication with a respective ink inlet, and an ink ejection port in fluid communication with the nozzle chamber; an actuator connected to the drive circuitry layer and displaceable with respect to the substrate on receipt of an electrical signal from the drive circuitry layer; and an ink ejection member operatively positioned with respect to the nozzle chamber and displaceable when the actuator is displaced such that ink is ejected from the ink ejection port, wherein the ink ejection member is configured so that the ink ejection member obstructs a flow of ink from the nozzle chamber into the inlet at a certain position in a displacement path of the ink ejection member.