Image forming apparatus

Details Image forming apparatus Image forming apparatus

2006-07-18

2006-07-18

Gray, David M. (Department: 2852)

Electrophotography

Image formation

Development

C399S269000, C430S111410, C430S111100

Reexamination Certificate

active

07079795

ABSTRACT:
An image forming apparatus includes an image bearing member having a surface on which an electrostatic latent image is to be formed; a black developing device, containing a black developer including toner and carrier, for developing the electrostatic latent image; at least one color developing device containing a color developer having a color other than black; a supplying device, provided for each of the black developing device and the color developing device, for supplying a supply material containing toner and carrier; a discharging device for discharging the developer. A resistivity of the carrier contained in the black developer is higher than resistivity of the carrier contained in the color developer, and a weight percentage of the carrier contained in the supply material for the black developing device is higher than a weight percentage of the carrier contained in the supply material for the color developing device.

REFERENCES:
patent: 5462828 (1995-10-01), Moffat et al.
patent: 6096466 (2000-08-01), Imai et al.
patent: 2003/0022089 (2003-01-01), Veregin et al.

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