Patent ID: 8425004
Filing Date: 2013-04-23
Classification: B41J

Abstract:
1. A printhead having an ink ejection face, wherein at least part of the ink ejection face is coated with a polymeric material, said polymeric material incorporating nanoparticles, wherein the printhead comprises a plurality of nozzle assemblies formed on a substrate, each nozzle assembly comprising: a nozzle chamber, a nozzle opening defined in a roof of the nozzle chamber and a thermal bend actuator for ejecting ink through the nozzle opening, said thermal bend actuator comprising: a first active element for connection to drive circuitry; and a second passive element mechanically cooperating with the first element, such that when a current is passed through the first element, the first element expands relative to the second element, resulting in bending of the actuator, wherein said thermal bend actuator defines at least part of a roof of each nozzle chamber, whereby actuation of said thermal bend actuator moves a moving portion of said roof towards a floor of said nozzle chamber.