Toner, and devices for electrostatically depositing a uniform ap

Details Toner, and devices for electrostatically depositing a uniform ap Toner, and devices for electrostatically depositing a uniform ap

1995-05-10

1997-04-29

Pendegrass, Joan H.

Electrophotography

Image formation

Development

G03G 1508

Patent

active

056254385

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: 5424814 (1995-06-01), Suzuki et al.
patent: 5473417 (1995-12-01), Hirano

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