Patent ID: 7001012

Claim:
A printhead chip which comprises a substrate that incorporates a drive circuitry layer; a plurality of nozzle chamber structures positioned on the substrate, each nozzle chamber structure defining a nozzle chamber and a pair of ink ejection ports in fluid communication with the nozzle chamber; a plurality of elongate actuators associated with respective nozzle chamber structures, each actuator having one end fast with the substrate to be electrically connected to the drive circuitry layer and to be reciprocally displaced relative to the substrate on receipt of an electrical signal from the drive circuitry layer; and an ink ejecting member positioned in each nozzle chamber and connected to the associated actuator to be reciprocally displaced by the actuator, the nozzle chamber structure being configured so that as the ink ejecting member is displaced in one direction, ink is ejected from one of the ink ejection ports and as the ink ejecting member is displaced in an opposite direction, ink is ejected from the other ink ejection port.