Patent ID: 7481943
Filing Date: 2009-01-27
Classification: B41J

Abstract:
1. A method of fabricating an inkjet printhead comprising the steps of: (i) providing a wafer substrate having a drop ejection side and an ink supply side; (ii) etching a plurality of trenches partially through said drop ejection side of said wafer; (iii) filling said trenches with photoresist; (iv) forming a plurality corresponding nozzles, ejection actuators and associated drive circuitry on said drop ejection side of said wafer using lithographically masked etching techniques; (v) etching a plurality of corresponding ink supply channels from said ink supply side of said wafer to said photoresist, said etching comprising an etching process using an etching gas plasma and a passivation process using a passivating gas plasma, wherein said passivating gas plasma comprises a hydrophilizing dopant; and (vi) stripping said photoresist from said trenches to form nozzle inlets, thereby providing fluid connection between said ink supply side and said nozzles.