Image forming apparatus having an aperture electrode with contro

Details Image forming apparatus having an aperture electrode with contro Image forming apparatus having an aperture electrode with contro

1993-11-08

1995-04-04

Royer, William J.

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

347148, G01D 1506

Patent

active

054041554

ABSTRACT:
The pulse width modulation circuit in the image forming apparatus of the invention comprises a discriminate circuit, an on-time control circuit, and an amplification circuit. The discriminate circuit determines whether an imaging potential or a non-imaging potential is applied to adjoining control electrodes. The on-time control circuit controls an applying time of the imaging potential to the control electrodes according to a result determined by the discriminate circuit, that is, according to the kind of potential applied to adjoining control electrodes. The amplification circuit amplifies the output from the on-time control circuit to a suitable control voltage which is sent to the control electrode. Therefore, it is possible to pass a predetermined amount of the toner particles through the desired aperture, even if the voltage applied by each control electrode is different. Moreover, a shield electrode may further be provided between the aperture electrodes of the present image forming apparatus to prevent an electric field from being generated between each control electrode.

REFERENCES:
patent: 3689935 (1972-09-01), Pressman et al.
patent: 5128695 (1992-07-01), Maeda
patent: 5214451 (1993-05-01), Schmidlin et al.
patent: 5229794 (1993-07-01), Honma et al.
patent: 5231427 (1993-07-01), Ohashi
patent: 5296879 (1994-03-01), Kagayama
patent: 5311266 (1994-05-01), Maeda

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