Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
2007-12-20
2008-10-28
Stephens, Juanita D (Department: 2853)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
C347S054000, C347S057000
Reexamination Certificate
active
07441879
ABSTRACT:
The invention provides for a unit cell of a printhead for an inkjet printer. The unit cell includes a wafer substrate, a layer of micro-electromechanical drive circuitry deposited on the wafer substrate, and an interlayer dielectric deposited on the drive circuitry layer. The unit cell also includes a passivation layer deposited on the dielectric layer, the passivation layer defining a plurality of vias therethrough. Side walls are deposited on the heater element. A nozzle plate is positioned on the side walls so that the nozzle plate and the side walls form an ink chamber. A heater element is suspended from the sidewalls in said ink chamber. The heater element is connected to the drive circuitry layer through the vias. The unit cell has an ink channel defined through the wafer substrate and ends in an ejection nozzle in the nozzle plate.
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patent: 5122812 (1992-06-01), Hess et al.
patent: 5208606 (1993-05-01), Klein et al.
patent: 5300951 (1994-04-01), Yamazaki
patent: 6019457 (2000-02-01), Silverbrook
patent: 6443558 (2002-09-01), Silverbrook
patent: 2004/0130597 (2004-07-01), Kim et al.
Silverbrook Research Pty Ltd
Stephens Juanita D
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