Patent ID: 6439691
Filing Date: 2002-08-27
Classification: B41J

Abstract:
A bubble-jet type ink jet printhead, comprising:a substrate; a nozzle plate having a plurality of nozzles, the nozzle plate being separated a predetermined distance from the substrate; a plurality of walls for closing the space between the substrate and the nozzle plate and then forming a common chamber between the substrate and the nozzle plate; a plurality of first resistive layers formed on the substrate within the common chamber corresponding to the plurality of nozzles, each of the plurality of first resistive layers being centered around a central axis passing through a center of each of said plurality of nozzles; a plurality of second resistive layers, each one of said plurality of second resistive layers being surrounded by corresponding ones of said plurality of first resistive layers, wherein each second resistive layer is electrically connected in parallel to each first resistive layer allowing a formation of a bubble on said central axis passing through said center of each of said plurality of nozzles by each one of said plurality of second resistive layers; a plurality of pairs of electrically conductive layers formed on the substrate, each pair being connected to the first and second resistive layers and extending to an outside of said common chamber; and a plurality of electrode pads which are disposed at said outside of said common chamber on said substrate and electrically connected to said electrically conductive layers.