Image forming apparatus

Details Image forming apparatus Image forming apparatus

1998-09-29

1999-09-21

Moses, Richard

Electrophotography

Image formation

Charging

399169, 399170, 399171, 399174, G03G 1502

Patent

active

059565489

ABSTRACT:
An image forming apparatus includes: a photosensitive unit having a surface portion of negatively charging property and moved in a predetermined direction; a first charging device disposed opposite to the photosensitive unit with a first spacing therebetween and for charging the surface of the photosensitive unit to a first charged potential of negative polarity by a negative voltage; a second charging device disposed opposite to the photosensitive unit with a second spacing therebetween at a position downstream of the first charging device in a movement direction of the photosensitive unit and for charging the surface of the photosensitive unit charged by the first charging device to a second charged potential of negative polarity by a positive voltage, the second charged potential having an absolute value smaller than an absolute value of the first charged potential; an electrostatic latent image forming device for forming an electrostatic latent image on the photosensitive unit; and a developer carrying device for carrying and conveying developer and for developing the electrostatic latent image formed by the electrostatic latent image forming device by using the developer to form a visible image. The charging efficiency of the first charging device is set to be larger than 10%.

REFERENCES:
patent: 5606398 (1997-02-01), Ender
patent: 5655187 (1997-08-01), Watanabe et al.
patent: 5729800 (1998-03-01), Ohba et al.
patent: 5741504 (1998-04-01), Akinaga et al.

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