Electrophotographic copier having image density control
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United States of America Patent
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Dec 29, 1992
Grant Date -
N/A
app pub date -
Jul 29, 1991
filing date -
Jul 30, 1990
priority date (Note) -
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status (Latency Note)
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Abstract
In an adaptive control electrophotographic apparatus, input voltages such as illumination power source voltage and electrostatic charge voltage are varied by a small value, and a resultant density of toner image on a photoconductive substance is detected. Then the above-mentioned small value is changed on the basis of a difference between the resultant density and a target density. After several repetitions of the above, the small value is determined on the basis of a qualitative model which is composed of a boundary function including the input voltages and boundary parameters of the apparatus. If the trend in the difference between the resultant density and the target density is an increase, the qualitative mode is changed to effect a decreasing trend.
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