Image forming apparatus using image carrier cleanerless system

Details Image forming apparatus using image carrier cleanerless system Image forming apparatus using image carrier cleanerless system

2005-09-06

2005-09-06

Ngo, Hoang (Department: 2852)

Electrophotography

Image formation

Combined or plural functions by single component

C399S055000, C399S056000

Reexamination Certificate

active

06941095

ABSTRACT:
An image forming apparatus having an image carrier, a charging unit for charging the image carrier and residual toner on the image carrier, a charging bias applying unit, an electrostatic image forming unit, a developing unit for collecting the residual toner on the image carrier and visualizing the electrostatic image, and a developing bias regulating unit. The apparatus further comprises an image ratio calculating unit for calculating an image ratio on the basis of the electrostatic image, and a regulating unit for regulating a contrast potential between the developing unit collecting the residual toner and the image carrier on the basis of a calculated image ratio. In the apparatus, an occurrence of the problem of adhesion of toner to a non-image area is prevented by fully collecting transfer residual toner also in forming an image having a high image ratio.

REFERENCES:
patent: 5805960 (1998-09-01), Suzuki et al.
patent: 6006055 (1999-12-01), Furuya
patent: 6052545 (2000-04-01), Komiya et al.

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