Charging apparatus and image forming apparatus

Details Charging apparatus and image forming apparatus Charging apparatus and image forming apparatus

2007-03-20

2010-06-01

Gray, David M (Department: 2852)

Electrophotography

Image formation

Charging

C399S171000, C399S173000

Reexamination Certificate

active

07729639

ABSTRACT:
There is provided a charging apparatus which has high durability and suffers from no rust etc. and of which controllability of charged potential of a photoreceptor is hardly impaired even with a some amount of contaminants such as a toner so that control of charged potential of a photoreceptor can be stably carried out to fall in an appropriate range over a long period of time, and moreover which is inexpensive. A charging apparatus includes a needle electrode, a holding member, two cleaner members, a support member, a moving member, a shield case, and a grid electrode. A length in minor axis of a secondary aggregate of polytetrafluoroethylene contained in a polytetrafluoroethylene-containing nickel layer formed on a surface of the needle electrode is twice or less than a layer thickness of the nickel layer.

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JP 2005-99670 (Apr. 2005) claiming priority to same application as U.S. Patent Application Publication No. 2005/0047829.
JP 8-171257 (Jul. 1996) claiming priority to same application as U.S. Patent No. 5,666,604.

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