Recorders – Markers and/or driving means therefor – With ink supply to marker
Patent
1991-07-02
1992-10-27
Hartary, Joseph W.
Recorders
Markers and/or driving means therefor
With ink supply to marker
298901, 437 42, B41J 205
Patent
active
051593530
ABSTRACT:
An improved thermal inkjet printhead having MOSFET drive transistors incorporated therein. The gate of each MOSFET transistor is formed by applying a layer of silicon dioxide onto a silicon substrate, applying a layer of silicon nitride onto the silicon dioxide, and applying a layer of polycrystalline silicon onto the silicon nitride. Portions of the substrate surrounding the gate are oxidized, forming field oxide regions. Drain and source regions are then conventionally formed, followed by the application of a protective dielectric layer onto the field oxide, drain, source, and gate. A resistive layer is deposited on the dielectric layer and directly connected to the source, drain, and gate. A conductive layer is deposited on a portion of the resistive layer, ultimately forming both covered and uncovered regions thereof. The uncovered region functions as a heating resistor, and the covered regions function as electrical contacts to the transistor and resistor.
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Computer patent search printouts.
Beckmann Jerome E.
Fasen Duane A.
Hess Ulrich E.
Hulings James R.
Metz Larry S.
Hartary Joseph W.
Hewlett--Packard Company
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