Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
2004-02-09
2008-10-07
Luu, Matthew (Department: 2861)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
C347S043000
Reexamination Certificate
active
07431433
ABSTRACT:
There is disclosed an ink jet printhead which comprises a plurality of nozzles3and a bubble forming chamber7corresponding to each nozzle respectively. Each nozzle3defines a nozzle aperture5with a central axis. At least one heater element10suspended in each bubble forming chamber7to heat a bubble forming liquid11to 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 heater element is spaced from the central axis and defines a current path substantially around the central axis. Directing the current flow around the axis of the nozzle aperture provides bubble alignment with the aperture for better ejection of drops while ensuring that the bubble collapse point is not on the heater element. This avoids the corrosive problems caused by cavitation forces.
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P. De Moor et al., “The Fabrication and Reliability Testing of Ti/TiN Heaters,” SPIE vol. 3874, Sep. 1999, pp 284-293.
The Fabrication and Reliabilty Testing of Ti/TiN Heaters, P. Demoor, Proceedings of SPIE, Micromachining and Microfabrication Process Technology V, vol. 3874, pp. 284-294. Please note, this document was provided in copending application 10/303,348.
Examiner's amendment from 10/302,617.
Dymetman, M., and Copperman, M., “Intelligent Paper in Electronic Publishing, Artist Imaging, and Digital Typography, Proceedings of EP'98”, Mar./Apr. 1998, Springer Verlag LNCS 1375, pp. 392-406.
Fidler Shelby
Luu Matthew
Silverbrook Research Pty Ltd
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