Control apparatus for controlling density of toner in a developing unit
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United States of America Patent
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Sep 11, 1990
Grant Date -
N/A
app pub date -
Apr 11, 1989
filing date -
Apr 13, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A control apparatus for controlling concentration of toner incorporated in developing material in a developing unit by means of controlling a toner replenishment to supply the toner in accordance with a toner concentration detected by a toner concentration detecting sensor in a first state wherein the detecting signal of the sensor is normal and to supply the toner by a constant volume at the predetermined period in a second state wherein the detecting signal of the sensor is abnormal.
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