Patent ID: 6942320

Claim:
A thermal bubble inkjet head having a symmetrical off-shooter heater comprising: a silicon substrate having a top surface and a bottom surface; a first insulating material layer of at least 1000 Å thick on said top surfaces; a funnel-shaped manifold formed in said silicon substrate; a symmetrical ring-shaped heater formed on said first insulating material layer on said top surface; an interconnect formed of a conductive metal in electrical communication with said ring-shaped heater; a second insulating material layer on top of said ring-shaped heater and said first insulating material layer; a first photoresist layer of at least 2000 Å thick on top of said second insulating material layer; an ink chamber formed in said first photoresist layer in fluid communication with said funnel-shaped manifold; a metal seed layer on said first photoresist layer and an inkjet orifice formed in said metal seed layer; and a Ni layer on top of said metal seed layer with an aperture formed therein in fluid communication with said inkjet orifice.