Back electrode control device and method for an image forming ap

Details Back electrode control device and method for an image forming ap Back electrode control device and method for an image forming ap

1994-11-29

1998-09-08

Le, N.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347112, B41J 206

Patent

active

058051856

ABSTRACT:
An image forming apparatus includes a toner supporting roller, an aperture electrode assembly including one or more apertures and associated control electrodes, a controller and a back electrode roller. The toner supporting roller supplies charged toner particles to the underside of the apertures of the aperture electrode assembly. The controller selectively generates a potential difference between each of the control electrodes and the toner supporting roller. A coulomb force generated by the potential difference attracts the toner particles towards the apertures of the aperture electrode assembly. When no voltage is applied to the control electrodes in generating a blank line, no voltage or a reverse voltage is fed to the back electrode roller. Thus, undesired toner particles are not inadvertently transferred to a printing paper, such that blank image areas spattered with unintentionally transferred toner particles are minimized.

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