Patent ID: 6742873
Filing Date: 2004-06-01
Classification: B41J

Abstract:
An inkjet printhead constructed by micro-electromechanical systems (MEMS) processing techniques comprises:a plurality of ink ejection nozzles, each nozzle defining a nozzle chamber, a plurality of external thermal bend actuators, each actuator having a proximal end anchored to a substrate and a distal end connected to an ink ejection paddle within a respective chamber; and wherein said external thermal bend actuator further comprises a series of layers and includes a planar conductive heating circuit layer which includes a first portion adjacent said proximal end forming a planar conductive heating circuit for heating said thermal bend actuator, and a second portion extending to said ink ejection paddle, said second portion being electrically isolated from said first portion by means of a discontinuity in said planar conductive heating circuit layer, said discontinuity being located external to said nozzle chamber.