Photocopying – Contact printing – Light boxes
Patent
1988-07-29
1991-04-30
Braun, Fred L.
Photocopying
Contact printing
Light boxes
355208, G03G 2100, G03G 1506
Patent
active
050122860
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.
REFERENCES:
patent: 4155638 (1979-05-01), Blitzer
patent: 4260073 (1981-04-01), Baumann
patent: 4572661 (1986-02-01), King
patent: 4671646 (1987-06-01), Florack et al.
patent: 4708458 (1987-11-01), Ueda et al.
patent: 4742372 (1988-05-01), Takahashi
patent: 4851875 (1989-07-01), Tanimoto
patent: 4873549 (1989-10-01), Tada et al.
Ishida Kouji
Kawano Hisaaki
Tanimoto Yasufumi
Braun Fred L.
Kabushiki Kaisha Toshiba
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