Electrophotographic apparatus of improved low image density

Details Electrophotographic apparatus of improved low image density Electrophotographic apparatus of improved low image density

1994-01-10

1996-08-27

Grimley, Arthur T.

Photocopying

Contact printing

Light boxes

118657, 355211, G03G 1300

Patent

active

055506194

ABSTRACT:
An electrophotographic apparatus includes a photoconductor drum, also known as an electrostatic latent image holding member, with a magnet placed therein. An electrostatic latent image is formed on the magnetic drum. Then, the drum is brought into contact with a magnetic developer, or toner, in a developer reservoir to have the magnetic developer attached to the photoconductor drum surface by a magnetic force. A removing roller, having an AC voltage applied thereto, is passed in close vicinity of the magnetic drum with the resultant development of images because toner remains at image areas only. In the electrophotographic apparatus, the photoconductor drum, the removing roller or both include two magnetic poles. A device for increasing friction force of the surface of the photoconductor drum, of the removing roller or both may also be provided.

REFERENCES:
patent: 3890929 (1975-06-01), Walkup
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patent: 4597661 (1986-07-01), Yamashita
patent: 4610527 (1986-09-01), Cherbuy et al.
patent: 4769676 (1988-09-01), Mukai et al.
patent: 5138387 (1992-08-01), Sato et al.
patent: 5229825 (1993-07-01), Yousey et al.
patent: 5298949 (1994-03-01), Yamamoto et al.
patent: 5488465 (1996-01-01), Yamamoto et al.

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