Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
2007-02-15
2008-12-30
Stephens, Juanita D (Department: 2853)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
C347S062000
Reexamination Certificate
active
07469996
ABSTRACT:
An inkjet printhead that has a plurality of nozzles3, each defining a nozzle aperture5with a nozzle axis normal to, extending through the center of the nozzle aperture. A bubble forming chamber7corresponds to each of the nozzles respectively. An inlet31to supply the bubble forming chamber with liquid11, the inlet being spaced from the nozzle axis. A heater element10is disposed in each of the bubble forming chambers respectively. The heater element configured as a beam suspended at its ends for immersion in the liquid supplied by the inlet such that heating the heater element forms a gas bubble that ejects a drop of the liquid through the nozzle corresponding to that heater element. The heater element nucleates the gas bubble at a point closer to the nozzle axis than the spacing between the inlet and the nozzle axis. The heater element is configured to nucleate the gas bubble at a point that is laterally offset from the inlet. Laterally offsetting the heater element10from the ink inlet31increases the fluidic drag retarding flow back through the inlet and ink supply passage. The fluidic drag through the nozzle aperture5is comparatively much smaller so little energy is lost to a reverse flow of ink through the inlet when a gas bubble forms on the element.
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Silverbrook Research Pty Ltd
Stephens Juanita D
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