Image forming apparatus

Details Image forming apparatus Image forming apparatus

2010-04-23

2011-12-06

Tran, Hoan (Department: 2884)

Electrophotography

Diagnostics

Consumable

C399S048000, C399S055000, C399S056000

Reexamination Certificate

active

08073347

ABSTRACT:
An image forming apparatus includes an image holder, a latent image forming unit, and a developing unit, the developing unit including a developer holder that is disposed to face the image holder and holds developer. Also included is a developer container, replenishing unit that replenishes new developer to the developing unit, a discharge unit that discharges the developer, a calculation unit that calculates an image area coverage of a toner image formed on the image holder, an obtaining unit that obtains a potential difference between the developer holder and the image portion on the image holder, and a controller that increases a discharge amount of the developer, when the image area coverage calculated by the calculation unit is smaller than a predetermined reference image area coverage, and the potential difference obtained by the obtaining unit is larger than a predetermined reference potential difference.

REFERENCES:
patent: 7734206 (2010-06-01), Ishida
patent: 7860413 (2010-12-01), Hayashi
patent: 7970305 (2011-06-01), Okuno et al.
patent: 7974568 (2011-07-01), Yamasaki et al.
patent: A-7-199639 (1995-08-01), None
patent: A-2007-47711 (2007-02-01), None
patent: A-2008-3963 (2008-01-01), None

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