Patent ID: 6471338
Filing Date: 2002-10-29
Classification: B41J,Y10T

Abstract:
A method for making a microinjector head with driving circuitry, comprising:providing a substrate; forming a dielectric layer having a first part and a second part on the substrate, said forming comprising: forming a thin oxide layer on the substrate; forming a silicon nitride layer on the thin oxide layer; oxidizing exposed regions of the thin oxide layer by local oxidation to form a field oxide, wherein the thin oxide layer covered by the silicon nitride layer is the first part of the dielectric layer, and the field oxide is the second part of the dielectric layer; and removing the silicon nitride layer; forming a driving circuit containing a plurality of functional devices on the first part of the dielectric layer; forming a low-stress material layer on the second part of the dielectric layer; etching the substrate and the dielectric layer to form a manifold and a plurality of fluid chambers, the manifold and the fluid chambers being connected to supply fluid to the chambers; forming aplurality of bubble generators on the low-stress material layer, the bubble generators connected to the driving circuit; and forming an orifice opening to the corresponding chamber to eject the fluid.