Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
2006-10-10
2006-10-10
Hsieh, Shih-Wen (Department: 2861)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
Reexamination Certificate
active
07118197
ABSTRACT:
There is disclosed an ink jet printhead which comprises a plurality of nozzles3and one or more heater elements10corresponding 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. When the gas in the bubble12recondenses, the bubble collapses to a ‘collapse point’17. In each nozzle3, the distance between the collapse point17and the ejection aperture5is less than 50 microns. The collapse of the bubble12assists the ejection of the drop16by promoting the ‘necking’18of ink11between the aperture5and the drop16during ejection. The drop16requires less momentum to overcome the retarding forces of surface tension, which in turn provides greater energy efficiency.
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Hsieh Shih-Wen
Silverbrook Research Pty Ltd
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