Patent ID: 7506965

Claim:
An inkjet printhead integrated circuit that comprises a substrate; a drive circuitry layer positioned on the substrate, the substrate and the drive circuitry layer defining a plurality of ink inlet channels; nozzle chamber walls and roofs spanning the nozzle chamber walls are positioned on the substrate to define nozzle chambers in fluid communication with respective ink inlet channels, the roofs defining respective ink ejection ports; ink ejection members positioned in respective nozzle chambers and displaceable with respect to the roofs to eject ink from the ink ejection ports; thermal actuators outside of and associated with respective nozzle chambers and connected to the drive circuitry layer to move with respect to the substrate on receipt of electrical signals from the drive circuitry layer; and work transmitting structures defining at least one of the walls of respective nozzle chambers and configured to transmit work from the actuators to the ink ejection members, pairs of work transmitting structures and associated ink ejection members each having a common layer of fabrication material.