Image forming apparatus and image density regulating method

Details Image forming apparatus and image density regulating method Image forming apparatus and image density regulating method

1998-12-01

1999-08-31

Grimley, Arthur T.

Electrophotography

Control of electrophotography process

Control of developing

399 43, 399 50, G03G 1510

Patent

active

059465247

ABSTRACT:
A test pattern image is formed on a photosensitive drum, and the density of the test pattern image is detected by a sensor. The grid voltage Vg of an electrifying charger and the toner concentration T/C in a developer are adjusted according to the detection result so that a target image density can be obtained. Every time a specified number of copies are made in a multiple copying operation, the adjusting target value of the toner concentration T/C is lowered by one step, and the adjusting target value of the grid voltage Vg is heightened by one step.

REFERENCES:
patent: 4312589 (1982-01-01), Brannan et al.
patent: 5826136 (1998-10-01), Saiko et al.

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