Patent ID: 6155674
Filing Date: 2000-12-05
Classification: B41J

Abstract:
A thin film ink jet printhead, comprising:a thin film substrate including a plurality of thin film layers;a plurality of ink firing heater resistors defined in said plurality of thin film layers;a silicon carbide passivation layer disposed on said plurality of thin film layers over said ink firing heater resistors;tantalum subareas disposed on said silicon carbide passivation layer over said plurality of ink firing heater resistors, said tantalum subareas respectively having edges;an ink barrier layer disposed over said silicon carbide passivation layer and said tantalum subareas, said ink barrier layer and said silicon carbide passivation layer forming a carbide/barrier bond region between said barrier layer and said silicon carbide passivation layer;respective ink chambers formed in said ink barrier layer over respective ink firing heater resistors and tantalum subareas, each chamber formed by a chamber opening in said barrier layer;said tantalum subareas positioned such that said edges are as close as practicable to said ink chambers without being in said chambers, so that said carbide/barrier bond region in a vicinity of said ink chambers extends closely to the ink chambers; andan orifice plate disposed over said ink barrier layer.