Fitzpatrick, Cella, Harper & Scinto
Substrate having layered electrode structure for use in ink jet head, ink jet head, ink jet pen, and ink jet apparatus
 A substrate for an ink jet head comprises a base member and an electrothermal converting body formed on the base member, the electrothermal converting body including a resistor layer and a pair of electrode layers connected to the resistor layer wherein the resistor layer positioned between a pair of the electrode layers serves as a heat generating portion for generating thermal energy utilized for discharging ink; wherein one of a pair of the electrode layers passes under the heat generating portion; an electrode layer positioned under the heat generating portion has a multi-layer structure composed of a plurality of layers; and at least one of a plurality of the layers, being nearest to the heat generating portion, is made of a metal having a melting point of 1500.degree. C. or more at 1 atm. An ink jet head using this substrate is able to prolong service life while reducing a failure ratio, and to continue preferable ink discharge for a long period of time. 
Canon Kabushiki Kaisha
B B B B B B B
B41J B41J B41J B41J B41J B41J B41J
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Masami Toshihiro
Kasamoto Mori