Ink jet print head

Details Ink jet print head Ink jet print head

1992-10-07

1997-12-16

Tran, Huan N.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 94, B41J 204, B41J 217

Patent

active

056990936

ABSTRACT:
A head for an ink jet printer has a substrate with a longitudinal dimension extending across the width of the paper to be printed upon. A cavity is formed longitudinally in the substrate and a conduit is provided to supply ink to the cavity. A series of orifices are spaced along a longitudinal surface of the substrate and extend between the surface and the cavity. A plurality of electrodes are provided to generate an arc within each orifice to expel ink there from. A pair of electrodes are associated with each orifice and the electrodes connect to electrical buses that supply bias voltage to the electrodes. The bus connection multiplexes the electrodes enabling relatively few switches to selectively control the expulsion of ink from each orifice. A diaphragm lies against the substrate forming a wall of the cavity and of the orifices. The diaphragm is formed of a resilient material that dampens pressure waves produced within an orifice and the cavity when an arc occurs between electrodes for that orifice.

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