Image forming apparatus and method for revising image density

Details Image forming apparatus and method for revising image density Image forming apparatus and method for revising image density

2005-05-24

2005-05-24

Ngo, Hoang (Department: 2852)

Electrophotography

Diagnostics

Consumable

C399S043000, C399S055000

Reexamination Certificate

active

06898384

ABSTRACT:
In an image forming apparatus employing a two-component developing system, there are provided printed-sheet number counting means; developing-device drive time integrating means for integrating time during which a developing device drives; and a toner replenishing motor drive time integrating means for integrating time during which a toner replenishing motor drives. Integrated drive time of the developing device and integrated drive time of the toner replenishing motor every fixed printed-sheet number, and the toner consuming quantity per drive time of the developing device is calculated from the extracted data. The toner charge quantity in a developer is predicted on the basis of the calculated data, and a developing bias voltage applied to the developing device is changed to thereby revise an image density.

REFERENCES:
patent: 5970280 (1999-10-01), Suzuki et al.
patent: 6134395 (2000-10-01), Sasaki et al.
patent: 6134396 (2000-10-01), Kaneko
patent: 6324354 (2001-11-01), Tode et al.
patent: 6687467 (2004-02-01), Katoh
patent: 2001-42613 (2001-02-01), None

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