Patent ID: 6056391
Filing Date: 2000-05-02
Classification: B41J

Abstract:
A substrate for an ink jet head comprising a base member and an electrothermal converting body formed on the base member, said electrothermal converting body including a resistor layer and a pair of electrode layers connected to said resistor layer, said resistor layer having a portion positioned between said pair of electrode layers, said portion serving as a heat generating portion for generating a thermal energy utilized for discharging ink,wherein one of said pair of electrode layers passes under said heat generating portion; the electrode layer positioned under the heat generating portion has a multi-layered structure comprising a plurality of layers which are stacked, an uppermost layer of said plurality of layers that is nearest to the heat generating portion is made of a metal having a melting point of 1500.degree. C. or more at 1 atm, and an insulating layer is provided between said resistor layer and said uppermost layer.