Patent ID: 6663228
Filing Date: 2003-12-16
Classification: B41J

Abstract:
A base member for an ink jet head, said base member comprising a substrate, a heat generating resistor provided between electrodes which constitute a pair on said substrate an upper protection layer provided on an insulation layer which in turn is provided on the heat generating resistor, said upper protection layer having a contact surface contactable to ink, in the improvement residing in thatsaid upper protection layer is made of amorphous alloy having a following composition formula: Ta&agr;Fe&bgr;Ni&ggr;Cr&dgr;=(1) â€ƒwhere 10 atomic % &lE;&agr;&lE;30 atomic %, &agr;+&bgr;<80 atomic % &agr;&ggr; and &agr;+&bgr;+&ggr;+&dgr;=100 atomic %, and at least the contact surface of said upper protection layer contains an oxide of a constituent component, wherein a film stress in said upper protection layer includes at least compression stress, which is not more than 1.0Ã—1010 dyne/cm2.