Developing unit and image forming device

Details Developing unit and image forming device Developing unit and image forming device

2011-08-30

2011-08-30

Gray, David M (Department: 4177)

Electrophotography

Image formation

Development

Reexamination Certificate

active

08010025

ABSTRACT:
A developing unit includes a developing roller which rotates about a rotational axis to supply toner to a photoreceptor, the developing roller including: a cylindrical core portion which includes an electric conductor; a first resistive layer which covers a cylindrical surface of the core portion; a second resistive layer which covers the first resistive layer, and has electric-resistivity lower than that of the first resistive layer; and a current leakage control member which prevents leakage of electric current from the core portion toward the second resistive layer through an end of the developing roller along a direction of the rotational axis.

REFERENCES:
patent: 6061539 (2000-05-01), Ishiyama et al.
patent: 6137986 (2000-10-01), Sugino et al.
patent: 6567638 (2003-05-01), Nakamura et al.
patent: 2007/0116493 (2007-05-01), Nakamura et al.
patent: 2004-318092 (2004-11-01), None

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