Patent ID: 8541248
Filing Date: 2013-09-24
Classification: B41J,H01L

Abstract:
1. A method for fabricating a planar heater structure for an ejection device, the method comprising: providing a substrate wafer, the substrate wafer comprising a plurality of plugs configured therewithin, each plug of the plurality of plugs being formed as an electrical connection and composed of a first metallic material; depositing and patterning a layer of a second metallic material over the substrate wafer, the patterning leaving a patterned layer of isolated sections of electrical conductors aligned vertically above said each plug and exposing a surface of the substrate wafer; providing a layer of a dielectric material of a predetermined thickness over the surface of the substrate wafer and the patterned layer of the isolated sections of electrical conductors; conducting chemical mechanical polishing of the layer of the dielectric material and a topmost portion of the patterned layer to form a planarized top surface exposing the patterned layer of the isolated sections of electrical conductors; cleaning the planarized top surface; and thereafter forming a resistive heater element to eject fluid, including