Patent ID: 7461923

Claim:
An inkjet printhead that comprises: a substrate defining a plurality of ink supply channels; CMOS micro-processing drive circuitry positioned on the substrate and including a pair of aligned metal contact layers; a layer of ink passivation material positioned over the drive circuitry and defining openings to permit electrical contact with the contact layers; a plurality of nozzle arrangements positioned on the substrate, each nozzle arrangement comprising a nozzle chamber assembly that defines an ink ejection port and a nozzle chamber in fluid communication with the ink ejection port and a respective ink supply channel, a dynamic structure of the assembly being displaceable with respect to a static structure to reduce and subsequently enlarge a volume of the nozzle chamber so that ink is ejected from the ink ejection port; and an elongate actuator connected to the dynamic structure at one end and fast with the substrate at another end to be connected to the metal contact layers, the actuator being configured to displace the dynamic structure on receipt of an electrical signal from the contact layers.