Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
2007-06-12
2007-06-12
Huffman, Julian D. (Department: 2853)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
C347S056000
Reexamination Certificate
active
10773199
ABSTRACT:
There is disclosed an ink jet printhead that has a plurality of nozzles3and one or more heater elements10in a bubble forming chamber7corresponding to each nozzle3. Each heater element10is configured to heat a bubble forming liquid11in the printhead to a temperature above its boiling point to form a gas bubble12therein. The generation of the bubble12causes the ejection of a drop16of an ejectable liquid (such as ink) through an ejection aperture5in each nozzle3, to effect printing. The gas bubble subsequently collapses to a point of collapse17that is spaced from any solid surface of the heater elements10or the bubble forming chamber7. By configuring the heater elements within the bubble forming chamber such the points of collapse of the bubbles are not on any solid surfaces, the corrosive effects of cavitation can be avoided.
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Choi Han Samuel
Huffman Julian D.
Silverbrook Research Pty Ltd
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