Image forming device forming an image on a recording medium usin

Details Image forming device forming an image on a recording medium usin Image forming device forming an image on a recording medium usin

1998-03-02

2000-03-28

Royer, William

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347141, B41J 206

Patent

active

060422203

ABSTRACT:
In a digital printer as an image forming device, a high voltage is applied to a counter electrode exclusively when the counter electrode is covered with a sheet of paper having a good insulating property, so that a strong electric field necessary for image formation is generated between the counter electrode and a toner carrier. When the counter electrode is not covered with a sheet of paper, a high voltage relay provided between the counter electrode and a high voltage power source is turned OFF so that the application of the high voltage to the counter electrode is suspended, so that the strong electric field is not generated. By doing so, it is possible to surely avoid discharge which tends to occur between the counter electrode and the toner carrier or between the counter electrode and the control electrode.

REFERENCES:
patent: 5781218 (1998-07-01), Wakahara et al.
patent: 5825384 (1998-10-01), Fujita
Japanese KOKAI (Published unexamined patent application) No. 286204/1994 (Tokukaihei 6-286204, Published date: Oct. 11, 1994).

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