Developing bias power unit for use in an image forming apparatus

Details Developing bias power unit for use in an image forming apparatus Developing bias power unit for use in an image forming apparatus

1992-12-09

1993-11-16

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

118651, G03G 1506

Patent

active

052628280

ABSTRACT:
An image forming apparatus accommodates a developing bias power unit for applying a bias voltage to a developing sleeve confronting a photosensitive member. The developing bias power unit includes a DC power source, an electricity storage element interposed between the DC power source and the developing sleeve, and a controller for on-off controlling the DC power source. When an output of the DC power source is activated, the electricity storage element is electrically charged by an output voltage of the DC power source, and a first voltage is applied to the developing sleeve. In contrast, when the output of the DC power source is deactivated, a second voltage of reverse polarity is applied to the developing sleeve by electric charge held in the electricity storage element.

REFERENCES:
patent: 3866574 (1975-02-01), Hardennrook et al.
patent: 4350749 (1982-09-01), Ohnuma et al.
patent: 4395476 (1983-07-01), Kanbe et al.
patent: 4984022 (1991-01-01), Matsushita et al.

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