Patent ID: 7182436

Claim:
An inkjet printhead integrated circuit that comprises a substrate that defines a plurality of ink supply channels; a drive circuitry layer that is positioned in the substrate; and a plurality of nozzle arrangements that is positioned on the substrate, each nozzle arrangement comprising a nozzle chamber structure arranged on the substrate and defining walls of a nozzle chamber in fluid communication with a respective ink supply channel; and a deformable roof structure arranged on the nozzle chamber structure and being at least partially defined by a plurality of discrete actuators, each actuator being configured to be heated on receipt of an electrical signal from the drive circuitry so as to experience differential thermal expansion and contraction, reciprocally to reduce and enlarge a volume of the nozzle chamber, the roof structure defining an ink ejection port such that, upon such reduction and enlargement, a drop of ink is ejected from the ink ejection port.