Printhead with turbulence inducing filter for ink chamber

Details Printhead with turbulence inducing filter for ink chamber Printhead with turbulence inducing filter for ink chamber

2008-07-30

2011-11-22

Vo, Anh T. N. (Department: 2861)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

C347S092000, C347S093000

Reexamination Certificate

active

08061815

ABSTRACT:
An inkjet printhead with an array of ink chambers, each having a nozzle, an actuator for ejecting ink through the nozzle, an inlet opening allowing ink to refill the chamber and a filter structure at the inlet opening. The filter structure has rows of obstructions extending transverse to the flow direction through the opening. The rows are spaced along the flow direction and the obstructions in each row being spaced such that they are out of registration with the obstructions in an adjacent row with respect to the flow direction. Filtering the ink as it enters the chamber removes the contaminants and bubbles but it also retards ink flow into the chamber. The present invention uses a filter structure that has rows of obstructions in the flow path. The rows are offset with respect to each other to induce turbulence. This has a minimal effect on the nozzle refill rate but the air bubbles or other contaminants are likely to be retained by the obstructions.

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