Process cartridge comprising memory medium storing...

Details Process cartridge comprising memory medium storing... Process cartridge comprising memory medium storing...

2007-03-20

2007-03-20

Beatty, Robert (Department: 2852)

Electrophotography

Control of electrophotography process

Control of charging

Reexamination Certificate

active

11204073

ABSTRACT:
A memory medium is provided to a cartridge detachably mountable to an image forming apparatus. Into the memory medium, as information for performing charge control, information on the amount of usage of an image-bearing member and information on a charging alternating voltage (a threshold value for selection control of a charging peak-to-peak voltage Vpp) are written. The image forming apparatus includes a charging-bias power-supply circuit, on its body side, including AC oscillation output circuit capable of outputting two or more species of alternating peak-to-peak voltages and an AC detector for detecting an alternating current passing through the image-bearing member. Charge control is performed on the basis of a detected value detected by the AC detector and memory information for the cartridge, whereby good charge control space saving, and cost reduction of the power-supply circuit are compatibly realized.

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