Patent ID: 7837887
Filing Date: 2010-11-23
Classification: B41J,B81B,B81C,H01L

Abstract:
1. A method of forming an ink supply channel for an inkjet printhead, said method comprising the steps of: (i) providing a wafer having a frontside and a backside; (ii) etching a plurality of frontside trenches into said frontside; (iii) filling each of the trenches with a photoresist plug; (iv) forming nozzle structures on the frontside using MEMS fabrication processes; (v) etching at least one backside trench from said backside, each backside trench meeting with one or more of said plugs; (vi) removing a portion of each photoresist plug via each backside trench by subjecting said backside to a biased oxygen plasma etch, thereby exposing sidewall features in the backside trench; (vii) modifying the exposed sidewall features; and (viii) removing the photoresist plugs to form at least one ink supply channel, said ink supply channel connecting said backside to said frontside, wherein the exposed sidewall features are modified by argon ion milling.