Image forming apparatus and method having image density correcti

Details Image forming apparatus and method having image density correcti Image forming apparatus and method having image density correcti

1993-03-23

1994-09-27

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355246, 346160, G03G 2100

Patent

active

053511077

ABSTRACT:
High and low density test patterns are formed from pattern generating unit as toner patterns on a photosensitive drum, and attached toner amounts corresponding to the test patterns are detected by toner density detecting unit under the control of a control circuit which calculates the differences between the attached toner amounts of the high and low density portions and respective target values, wherein, when the calculated differences do not fall within respective predetermined ranges, the exposure conditions of an optical system and the bias voltage of a developing unit, or the exposure amount of the optical system and the bias voltages of a charger and the developing unit, or the bias voltages of the charger and the developing unit and the light-emission period of the optical system are renewed.

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