Patent ID: 7470003

Claim:
A printhead that comprises: a substrate that defines a plurality of ink inlet channels; a drive circuitry layer positioned on the substrate; and a plurality of nozzle arrangements positioned on the support, each nozzle arrangement comprising a wall portion bounding a respective ink inlet channel; a crown portion defining an outlet through which ink can be ejected; a skirt portion depending from the crown portion so that the crown, skirt and wall portions define a nozzle chamber in fluid communication with the respective ink inlet channel and the outlet; an elongate actuator connected to the crown portion at one end and anchored to the substrate at an opposite end, to receive electrical signals from the drive circuitry, the actuator being configured so that, on receipt of an electrical signal from the drive circuitry layer, the actuator is displaced towards and away from the substrate to reduce and subsequently enlarge the nozzle chamber so that ink is ejected from the outlet, the nozzle arrangement being arrayed on the substrate such that the outlets form a plurality of sets of parallel rows with each adjacent pair of sets spaced apart by a fixed distance.