Developing device for an image forming apparatus

Electrophotography – Image formation – Development

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Details

4301066, 430111, G03G 1508, G03G 1509

Patent

active

058451838

ABSTRACT:
In an image forming apparatus, a developing device operable with toner or single component type developer has a hard first developing roller and a soft second developing roller. Fine magnetic N-S poles are formed on the periphery of the first roller. The second roller conveys the toner, electrostatically transferred thereto from the first roller, to an image carrier. The device frees a toner image from deterioration due to toner particles charged to a polarity opposite to an expected polarity. The toner forms a uniform thin layer on the first roller and is uniformly charged. Toner for use with this type of developing device is also disclosed.

REFERENCES:
patent: 4495268 (1985-01-01), Miyakawa et al.
patent: 4525447 (1985-06-01), Tanaka et al.
patent: 5424814 (1995-06-01), Suzuki et al.
patent: 5473417 (1995-12-01), Hirano et al.
patent: 5532804 (1996-07-01), Hirata et al.
patent: 5625441 (1997-04-01), Sugiyama et al.
Patent Abstracts of Japan, vol. 9, No. 292 (P-406), Nov. 19, 1985, JP 60-130752, Jul. 12, 1985.

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