Patent ID: 6204182
Filing Date: 2001-03-20
Classification: B41J

Abstract:
A method for creating a printhead for ejecting fluid from reentrant holes comprising the steps of:depositing a plurality of energy dissipating elements, in proximity to where said reentrant holes are to be located, within in a plurality of thin-film layers on a first surface of a semiconductor substrate;creating a plurality of fluid feed, slots through said plurality of thin-film layers and said plurality of fluid feed slots opening within where said reentrant holes in the dielectric material are to be located;depositing a layer of graded dielectric material on said plurality of thin-film layers;applying a masked photoimagable material on said deposited layer of graded dielectric material;exposing said masked photoimagable material to electromagnetic energy, whereby patterned photoimagable material is created;developing said patterned photoimagable material;anisotropically etching said deposited layer of graded dielectric material;isotropically etching said deposited layer of graded dielectric material thereby creating the reentrant holes; andcreating a plurality of fluid feed channels through a second surface of said semiconductor substrate and disposing said plurality of fluid feed channels in association with said plurality of fluid feed slots so that said plurality of fluid feed slots are exposed.