Patent ID: 6623108
Filing Date: 2003-09-23
Classification: B41J

Abstract:
An ink jet printhead comprising a plurality of nozzle devices formed on a substrate, each nozzle device comprising:a nozzle chamber, a nozzle opening through which ink from the nozzle chamber is ejected, a movable element in contact with ink in the nozzle chamber to cause said ejection of ink, a thermal bend actuator having a proximal end anchored to the substrate and a distal end connected to the movable element, the actuator including a first portion adjacent the proximal end external to the nozzle chamber and having a conductive heating circuit layer for heating the actuator, and a second portion extending to said movable element and in contact with said ink, wherein said actuator includes a dielectric means for electrically isolating said first and second portions so that electric energy in said heating circuit layer is not conducted by the actuator to said ink.