Patent ID: 7210764
Filing Date: 2007-05-01
Classification: B41J

Abstract:
1. A printhead for ejecting ink, the printhead comprising: a substrate defining a plurality of ink supply channels; a plurality of nozzles operatively mounted to the substrate and defining respective ink chambers in fluid communication with respective ink supply channels and apertures through which ink can be ejected; a plurality of elongate actuators each comprising a thermally actuated arm with one end fixed to the substrate and a free end extending into a respective ink chamber and configured to move to eject ink from the corresponding aperture, each thermally actuated arm having a heater element; and a drive circuitry layer positioned on the substrate, the drive circuitry layer including a plurality of drive transistors connected to the heater elements of corresponding respective actuators, the drive transistors being interposed between their associated actuators and the substrate.