Liquid-projection method and device for high-resolution printing

Details Liquid-projection method and device for high-resolution printing Liquid-projection method and device for high-resolution printing

1992-06-24

1996-02-06

Beatty, Robert

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 76, G01D 1518

Patent

active

054899290

ABSTRACT:
In a liquid projection method and a high-resolution printing device in a vibrationally excited continuous ink-jet printer, an ink jet is divided into drops in the vicinity of a charging device for the electrostatic charging of these drops creating an electrical field that is asymmetrical with respect to the axis of the jet. The method comprises a first step of creating a single microdrop at the upstream end of a main drop by the application of a charging voltage V.sub.M higher than the Rayleigh voltage to the charging device when this main drop appears. Then a second step of deflecting the microdrop to be used for the printing by the application, to the following main drop, of a charging voltage V.sub.c, lower than the voltage V.sub.M and lower than the Rayleigh voltage, that can be modulated as a function of the path chosen for the microdrop towards the printing medium. The charging device can take the form of two half-planes intersecting each other in a direction parallel to the axis of the ink jet.

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