Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
2007-09-11
2007-09-11
Stephens, Juanita D. (Department: 2853)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
C347S063000, C347S064000
Reexamination Certificate
active
11093144
ABSTRACT:
An inkjet printhead heater chip includes a resistor layer, a dielectric layer on the resistor layer and a cavitation layer on the dielectric layer. A grounded-gate MOSFET electrically attaches to the cavitation layer to protect the dielectric layer from breakdown during an electrostatic discharge (ESD) event. Protection typically embodies the safe distribution of ESD current to ground during user printhead installation. Locations of the grounded-gate MOSFET(s) include terminal ends of one or more columns of ink ejecting elements formed by the resistor layer. Also, the MOSFET source electrically connects to the gate while the drain attaches to the cavitation layer. The drain attaches via first and second metallization lines, including attachment generally above the cavitation layer. The dielectric layer is diamond like carbon layer and is about 2000 angstroms thick. Inkjet printheads and printers are also disclosed.
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Sanjay Dabral, Timothy Maloney, “Grounded-Gate NMOS,” Basic ESD and I/O Design, Wiley Interscience Publication / John Wiley & Sons, Inc., pp. 22-23.
King & Schickli PLLC
Lexmark International Inc.
Stephens Juanita D.
LandOfFree
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