Image forming apparatus having device for detecting concentration of developing agent
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United States of America Patent
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-
Apr 30, 1991
Grant Date -
N/A
app pub date -
Jul 29, 1988
filing date -
Jul 31, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an image forming apparatus, a developing unit for developing a latent image on a photosensitive drum is detachably mounted in the apparatus and is provided with a identification signal generator for each particular developing unit. When the developing unit is replaced by a new one, an identification signal generated from the generator is compared in a CPU with reference identification data stored in a memory. When the generated identification signal differs from the stored reference identification data, the generated identification signal is stored as a new reference data in the memory and a toner concentration signal generated from the sensor is also stored as new reference toner concentration data in the memory. Thus, a desired toner concentration can be maintained even through developing units are replaced.
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