Printhead nozzle arrangement with a roof structure having a...

Details Printhead nozzle arrangement with a roof structure having a... Printhead nozzle arrangement with a roof structure having a...

2008-04-11

2009-10-20

Do, An H (Department: 2853)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

C347S056000, C347S065000

Reexamination Certificate

active

07604323

ABSTRACT:
The invention relates to a nozzle arrangement for an inkjet printhead. The nozzle arrangement has a substrate with a layer of drive circuitry, the substrate defining an ink chamber with an ink supply channel etched through the substrate. The roof structure has a roof layer over the chamber which includes a nozzle rim, actuators, and a series of struts. The nozzle rim is positioned about an ejection port defined in the roof layer above the chamber. The actuators are radially spaced about, and displaceable with respect to, the nozzle rim, with each actuator configured to thermally expand upon receiving current from the drive circuitry. This expansion moves the actuators into the chamber to increase a fluid pressure inside the chamber to eject a drop of ink via the ejection port. The struts are interspersed between the actuators to support the nozzle rim to the roof layer.

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