Roller charging apparatus and image forming apparatus using the

Details Roller charging apparatus and image forming apparatus using the Roller charging apparatus and image forming apparatus using the

1994-05-31

1997-04-08

Lee, Shuk Yin

Electrophotography

Image formation

Charging

361225, 399100, G03G 1502

Patent

active

056193114

ABSTRACT:
In the roller charging apparatus according to the present invention, the charging roller includes a layer of an epichlorohydrin rubber, so that it is possible to eliminate electric nonuniformity of a conductive elastic layer and to be charged by loading only a DC voltage. The charging roller also may have a surface layer formed of polyamide resin or fluorine resin. In addition durability can be improved by setting the roller hardness of the charging roller to 42 (measured by a JISA hardness meter) or more. Further, a roller diameter D.sub.r of the charging roller and drum diameter D.sub.d of the photosensitive drum may satisfy the relation of D.sub.d /D.sub.r .gtoreq.4. A cleaner can also be provided for removing foreign materials, such as toner, from the charging roller, and the cleaner may have a rubber hardness less than that of the charging roller.

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patent: 5497219 (1996-03-01), Kurokawa et al.
patent: 5499078 (1996-03-01), Kurokawa et al.

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