Printhead chip incorporating a double action ink ejection mechanism

摘要

A printhead chip includes a substrate that incorporates a drive circuitry layer. A plurality of nozzle chamber structures is positioned on the substrate. Each nozzle chamber structure defines a nozzle chamber and a pair of ink ejection ports in fluid communication with the nozzle chamber. A plurality of elongate actuators is associated with respective nozzle chamber structures. Each actuator has 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. An ink ejecting member is positioned in each nozzle chamber and is connected to the associated actuator to be reciprocally displaced by the actuator. The nozzle chamber structure is 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.