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US 2011/0084997 A1Published application
Determining a healthy fluid ejection nozzle
AssigneeHewlett-Packard Development Company, L.P.
InventorsChien-Hua Chen, Donald W. Schulte, Terry McMahon, Ying-Chih Liao, David D. Hall
Life of this patent
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Abstract
A method of determining a healthy fluid ejection nozzle includes measuring changes in impedance across the nozzle as fluid passes through it. A printhead includes a metal probe that intersects an ink nozzle and an integrated circuit to sense a change in impedance across the nozzle through the metal probe.
Claims15
A method of determining a healthy fluid ejection nozzle comprising measuring a change in impedance across the nozzle as fluid passes through the nozzle.
A printhead comprising:
- a first metal trace intersecting an ink nozzle;
- and
- an integrated circuit coupled to the first metal trace to sense a change in impedance across the nozzle through the first metal trace.
A method of fabricating an inkjet printhead comprising:
- forming an SU8 chamber layer having a chamber;
- forming a top hat SU8 layer over the SU8 chamber layer, the top hat SU8 layer forming a nozzle over the chamber;
- and
- forming a metal trace on the top hat SU8 layer, where a first end of the metal trace intersects the nozzle and a second end of the metal trace extends to an edge of a die.
1 more element
Dependencies are inferred from the claim text.