Image forming apparatus, process cartridge and developing...

Details Image forming apparatus, process cartridge and developing... Image forming apparatus, process cartridge and developing...

2006-03-15

2008-08-05

Ngo, Hoang (Department: 2852)

Electrophotography

Diagnostics

Consumable

C399S055000

Reexamination Certificate

active

07409168

ABSTRACT:
Provided is a development technique of supplying a developing bias voltage having DC and AC components to a developing roller thereby to supply a developer to a photosensitive surface of a photosensitive material, which can contribute to improvement of the image quality of an image to be developed. The image forming apparatus, includes: a developing roller for supplying a developer to a photosensitive surface of a photosensitive material carrying an electrostatic latent image thereby to make the electrostatic latent image visible; and a voltage control unit for supplying a combination of a predetermined DC voltage and a predetermined AC voltage as a developing bias voltage to the developing roller as well as controlling the predetermined AC voltage so that a relation between a circumferential speed N of the developing roller and a frequency f of the AC voltage is as follows: −0.097×N+61.17≦(f/N)≦−0.093×N+67.33.

REFERENCES:
patent: 2005/0191073 (2005-09-01), Kawamura et al.
patent: 2001-157686 (2002-12-01), None

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