Circuit routing scheme for an ink jet printhead that has increased reisitance to corrosion
AssigneeHewlett-Packard Development Company, L.P.
InventorsWilliam Connors, Terry McMahon, Donald Schulte, Keith Moore
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Abstract
The present invention includes as one embodiment an ink jet printhead having a circuit with plural resistors and a power bus. The printhead includes a metal stack formed within the circuit, which is comprised of a first metal layer and a second metal layer and at least one power via. The power via is formed within the circuit as an interface between the first metal layer and the second metal layer and acts as a separation barrier between conductive portions of the resistors and the power bus.
Claims24
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A method of manufacturing a fluid ejection device, comprising:
- providing a first metal layer comprising a power bus and a FET bus;
- providing the second metal layer, a second metal layer comprising a conductive layer portion and a corrosion-resistant layer portion;
- providing a first electrical connection between the power bus and the second metal layer and a second electrical connection between the second metal layer and the FET bus, wherein the first and second electrical connections are made through the corrosion-resistant layer portion.
Dependencies are inferred from the claim text.