Image forming apparatus in which a potential well is formed in a

Details Image forming apparatus in which a potential well is formed in a Image forming apparatus in which a potential well is formed in a

1997-02-04

1998-09-15

Lee, S.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

G01D 1516

Patent

active

058086382

ABSTRACT:
The recording head have a substrate and a plurality of ring-shaped recording electrodes juxtaposed on the substrate. A counter electrode is located above the recording electrodes and spaced apart therefrom by a predetermined distance. Each recording electrode consists of a ring and a lead. A pulse generator is connected by an IC (not shown) to the leads, for applying a drive voltage to each recording electrode. The drive voltage consists of a bias voltage and a recording voltage higher than the bias voltage. When a bias voltage, having the same polarity as a charged polarity of coloring particles dispersed in an insulating liquid, is applied to each recording electrode, potential wells are formed. The coloring particles in ink are thereby trapped in the ring of the electrodes. The coloring particles agglomerate in the apical part of the ink meniscus formed at the recording electrode. When the recording voltage, having the same polarity as a charged polarity of the coloring particles. is applied to any recording electrodes selected in accordance with an image signal, the agglomeration of coloring particles flies from the potential well toward the counter electrode, forming any dot on a recording medium interposed between the recording head and the counter electrode.

REFERENCES:
patent: 4263601 (1981-04-01), Nishimura et al.
patent: 4404573 (1983-09-01), Kocot et al.
patent: 5235354 (1993-08-01), Larson
patent: 5523777 (1996-06-01), Kitamura

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