Charging device, process cartridge, and image forming apparatus

Details Charging device, process cartridge, and image forming apparatus Charging device, process cartridge, and image forming apparatus

2007-10-30

2007-10-30

Nguyen, Vincent Q. (Department: 2858)

Electrophotography

Internal machine environment

Forced air circulation

C399S093000

Reexamination Certificate

active

11006735

ABSTRACT:
A charging device includes a case that surrounds a charging unit and has plural ventilating sections, a gas separating unit that varies a component ratio of the air near an opposed portion of a photosensitive member and the charging unit, and a gas electrolyzing unit that electrolyzes moisture of the area near the opposed portion. The gas separating unit has a nitrogen enriching unit that includes a nitrogen enriching film set in a ventilating section and a pressurizing chamber for forming a pressure difference between the inside and the outside of the case and supplies a nitrogen enriched air to the inside of the case or an oxygen enriching unit that includes an oxygen enriching film set in another ventilating section and a depressurizing chamber for forming a pressure difference between the inside and the outside of the case and exhausts an oxygen enriched air to the outside of the case.

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U.S. Appl. No. 11/370,823, filed Mar. 9, 2006, Nakagawa et al.
U.S. Appl. No. 11/376,434, filed Mar. 16, 2006, Takahashi et al.

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