Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
2008-07-09
2010-12-28
Luu, Matthew (Department: 2861)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
C347S065000, C347S063000, C347S061000
Reexamination Certificate
active
07857426
ABSTRACT:
Provided is a micro-electromechanical nozzle arrangement for an inkjet printhead. The arrangement includes a substrate defining an inverted pyramidal ink chamber with a vertex thereof terminating at an ink supply channel through the substrate, said substrate having a layer of CMOS drive circuitry. The arrangements also includes a roof structure connected to the drive circuitry layer and covering the ink chamber, the roof structure defining a fluid ejection nozzle rim above said chamber in addition to ink flow guide rails to minimize wicking along the nozzle rim according to surface tension effects of ink in the chamber. Also included is a plurality of actuators displaceable with respect to, and radially spaced about, the nozzle rim, and in between, the guide rails. Each actuator has a serpentine heater element configured to thermally expand upon receiving current from the drive circuitry thereby moving said actuators into the chamber operatively increasing a fluid pressure inside the chamber to eject a drop of ink via the ejection nozzle.
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McAvoy Gregory John
Silverbrook Kia
Legesse Henok
Luu Matthew
Silverbrook Research Pty Ltd
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