Developing device and image forming apparatus including the...

Details Developing device and image forming apparatus including the... Developing device and image forming apparatus including the...

2011-04-12

2011-04-12

Tran, Hoan (Department: 2884)

Electrophotography

Control of electrophotography process

Of plural processes

C399S058000

Reexamination Certificate

active

07925175

ABSTRACT:
A developing device includes a developer container storing a developer, a developer supplying member supplying a toner stored in the developer container to an image bearing member, a voltage applying unit capable of applying a bias voltage to the developer supplying member, an image density detecting unit detecting a density of toner formed on the image bearing member, and a control unit correcting a toner concentration in the developer on the basis of a result of image density detection of a reference toner image formed on the image bearing member. The control unit is capable of executing a first toner concentration correction between printing operations and executing a second toner concentration correction between predetermined points during continuous printing.

REFERENCES:
patent: 5057870 (1991-10-01), Aoki
patent: 7603046 (2009-10-01), Hirayama
patent: 7751730 (2010-07-01), Kato et al.
patent: 7881629 (2011-02-01), Takeuchi et al.
patent: 02-050183 (1990-02-01), None

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