Patent ID: 6039438
Filing Date: 2000-03-21
Classification: B41J

Abstract:
An inkjet pen for ejecting ink droplets onto a print medium, said pen comprising:an inkjet printhead and a surface to which the inkjet printhead is coupled;the inkjet printhead comprising a substrate and a plurality of layers and having a plurality of printing elements formed in the plurality of layers, the plurality of layers overlaying the substrate, wherein each one printing element of said plurality of printing elements comprises:(a) a resistive element for heating ink to generate said ink droplets, the resistive element formed in a conductive layer of said plurality of layers;(b) a firing chamber having a base supporting said resistive element, the firing chamber defined by a chamber wall, the wall formed by one or more layers of said plurality of layers;(c) an ink feed channel for supplying ink to said firing chamber through a firing chamber entrance; and(d) a nozzle in communication with the firing chamber through which ink droplets are ejected, the nozzle having a nozzle opening occurring in at least an outermost layer of the plurality of layers, said outermost layer being furthest of the plurality of layers from the substrate;wherein said nozzle opening from respective ones of said plurality of printing elements together form a plurality of nozzle openings,wherein respective non-plugged openings are formed in at least said outermost layer of said plurality of layers in regions of the printhead between respective nozzle openings of said plurality of nozzle openings.