Patent ID: 6315396
Filing Date: 2001-11-13
Classification: B41J

Abstract:
A substrate for use in an ink jet recording head comprising:a base member:an insulating film comprising an insulating material;a bubble generating beater arranged in association with a corresponding ink-flow channel for causing bubble generation in ink flowing through said ink flow channel, said bubble-generating heater being formed from a resistive material;a non bubble-generating preheating heater also arranged in association with said ink flow channel for generating heat for preheating ink in said recording head without causing bubble generation in the ink, said preheating heater being formed of a resistive material capable of generating heat to be applied to said recording head for preheating ink in said recording head without causing bubble generation in the ink;said preheating heater being located upstream of said bubble generating heater along said flow path through which ink flows in a given direction through said ink flow channel over said substrate,said preheating heater being provided in a layer lower than that of said bubble-generating heater with interposition of said insulating film, and said preheating heater being constructed to preheat ink in said flow channel by an amount insufficient to cause bubble generation but sufficient to improve the frequency characteristics of ink refilling; andsaid insulating layer being formed on said substrate over said preheating heater,said bubble-generating heater and a wiring layer being formed on and in contact with said insulating film,said wiring layer being formed in a predetermined pattern of wiring to supply electrical power to said bubble-generating heater, andsaid wiring in said wiring layer being electrically connected through said insulating film to said preheating layer.