Image forming device and image forming method

Details Image forming device and image forming method Image forming device and image forming method

1997-12-04

2000-04-04

Grimley, Arthur T.

Electrophotography

Control of electrophotography process

Control of charging

399176, G03G 1502

Patent

active

06047145&

ABSTRACT:
An image forming apparatus of the present invention includes at least an image carrier and a contact type charging device. The image forming apparatus further includes a control control device that controls the contact type charging device so as to apply DC voltage having the same polarity as the charging polarity of the image carrier to the image carrier at the same time that or before rotation of the image carrier begins and successively applies a voltage in which AC voltage is superimposed on the DC voltage at the same time that or after the DC voltage is applied and at the latest after the rotation of the image carrier begins. Therefore, according to the present invention, electrostatic memory in the image carrier is prevented, so that the occurrence of black stripe or the like corresponding to a contact point of the contact type charging device is prevented, thereby enabling formation of high quality images.

REFERENCES:
patent: 5450180 (1995-09-01), Ohzeki et al.
patent: 5568232 (1996-10-01), Kashihara

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