Precision ejection ink-jet printing apparatus

Details Precision ejection ink-jet printing apparatus Precision ejection ink-jet printing apparatus

1998-03-09

2000-11-07

Brase, Sandra

Incremental printing of symbolic information

Ink jet

Ejector mechanism

B41J 206

Patent

active

061426105

ABSTRACT:
A precision ejection ink-jet printing apparatus to prevent self-ejection. Self-ejection is an ejection of coloring agent particles from an ink-ejection opening without an application of ejection voltage to an ejection electrode. The precision ejection ink-jet printing apparatus includes an ink chamber filled with a pigment type ink, an electrophoretic electrode for causing coloring agent particles in the pigment type ink to concentrate at ink ejection openings, a plurality of ejection electrodes for causing ejection of the coloring agent particles concentrated at the ink ejection openings toward a printing medium, and voltage controller for controlling a voltage to be applied to the electrophoretic electrode. The voltage controller gradually increases the applied voltage up to a predetermined target voltage. The gradual increase in voltage moderates the electrophoretic motion of the coloring agent particles, preventing self-ejection.

REFERENCES:
patent: 4935754 (1990-06-01), Miyazawa et al.
patent: 5646659 (1997-07-01), Moriyama et al.
patent: 5874972 (1999-02-01), Suetsugu et al.
patent: 5926194 (1999-07-01), Hagiwara et al.

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