Patent ID: 6447102
Filing Date: 2002-09-10
Classification: B41J

Abstract:
A printhead for ejecting fluid using a semiconductor substrate, comprising:a semiconductor substrate having a first surface and a second surface; a stack of thin-film layers affixed to said first surface of said semiconductor substrate, said stack of thin-film layers further comprising an energy dissipating element, and said stack of thin-film layers defining a fluid feed slot; a layer of slow cross-linking polymer of cross-linked polyimide or epoxy with an optical dye having a fluid-well defined therein, said slow cross-linking polymer applied on said stack of thin-film layers, said fluid-well positioned over said fluid feed slot; a layer of fast cross-linking polymer of cross-linked polyimide or epoxy with no optical dye having an orifice defined therein, said fast cross-linking polymer applied on said layer of slow cross-linked material, said orifice positioned over said energy dissipating element; and a fluid feed channel defined within said second surface of said semiconductor substrate and opening into said fluid feed slot.