Patent ID: 7159968
Filing Date: 2007-01-09
Classification: B05D,B41J,Y10T

Abstract:
1. A printhead integrated circuit comprising a drive circuitry and a plurality of nozzles, each nozzle comprising: a chamber for holding ink to be ejected, the chamber having an opening defined in a roof structure; a thermal bend actuator for ejecting droplets of ink from the chamber through the opening, the bend actuator being configured as a cantilever with one end of the cantilever anchored to a base and the opposite end supporting a paddle, the actuator having a deflector section constructed of a material having a high coefficient of thermal expansion and a barrier layer constructed of a dielectric material having low thermal conductivity; wherein supply of current from the drive circuitry to the deflector section causes differential thermal expansion between the deflector section and the barrier layer such that the actuator bends and the paddle ejects a droplet of ink from the nozzle.