Patent ID: 7178899

Claim:
A printhead integrated circuit for a pagewidth printhead, the printhead integrated circuit comprising an elongate substrate that defines a plurality of ink inlet passages; a drive circuitry layer positioned on the substrate; a plurality of nozzle chamber structures positioned on the substrate and defining nozzle chambers in fluid communication with respective ink inlet passages and ink ejection ports in fluid communication with respective nozzle chambers; a plurality of ink ejection members received in respective nozzle chambers and reciprocally displaceable to eject ink from the ink ejection ports; and a plurality of elongate actuators, each fast at a fixed end with the substrate and attached to respective ink ejection members at a free end, the actuators being connected to the drive circuitry layer to displace respective ink ejection members on receipt of electrical pulses from the drive circuitry layer, wherein the nozzle chamber structures and associated elongate actuators are positioned on the substrate to define at least one pair of longitudinally extending rows of nozzle chamber structures adjacent each other.