Image forming apparatus with toner density control

Details Image forming apparatus with toner density control Image forming apparatus with toner density control

2006-11-10

2010-06-29

Gray, David M (Department: 2852)

Electrophotography

Diagnostics

Consumable

C399S027000, C399S061000, C399S062000, C399S063000

Reexamination Certificate

active

07747182

ABSTRACT:
An image forming apparatus in which a predetermined image density can be obtained by correcting a toner density control target value without consuming toner. The toner density of the developer is controlled so that an output value Vt of a magnetic permeability sensor approaches a target output value Vtref. In addition, the target output value Vtrefis corrected in accordance with image coverage history information of output images transferred to a transfer paper and image coverage ratio history information of output images determined from the image coverage thereof and the size of the transfer paper. This history information comprises, for example, a cumulative average value of the image coverage or the image coverage ratio per transfer paper. It may also comprise a moving average value of the image coverage or the image coverage ratio per transfer material.

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