Yasunari Watanabe

Image forming apparatus preventing change of size of image

Image forming apparatus with image bearing member charger that reduces the amount of toner electric charge

ELECTRIFICATION CONTROLLING METHOD, AND IMAGE FORMING DEVICE

Developing apparatus having a direct or alternating current applied thereto

CONTROL METHOD OF ELECTRIFICATION, AND IMAGE FORMING DEVICE

Control method of AC voltage to be applied to electrifier

Method of controlling an AC voltage applied to an electrifier

Image forming apparatus with environmentally-controlled first and second charging members

Image forming apparatus featuring first and second peak-to-peak charging voltages, respectively, corresponding to first and second image bearing member speeds and voltage frequencies

Method for controlling electrostatic charge voltage and image forming device