Electrophotography – Control of electrophotography process – Of plural processes
Patent
1996-05-22
1998-02-24
Beatty, Robert
Electrophotography
Control of electrophotography process
Of plural processes
399138, G03G 1500
Patent
active
057220050
ABSTRACT:
An exposure step input circuit inputs a desired brightness of a printing image as one of a plurality of exposure steps and a lamp application voltage adjusting unit allows the application voltage of an exposure lamp to, on the bright side of the exposure steps, be increased with a smaller predetermined slope than a dark side each time the exposure step is switched in the bright direction. At this time, a shortage of an exposure is compensated for by lowering a surface potential on a photosensitive drum through the decreasing of a charge current by a charger or raising a developing bias voltage of a developing unit. An image forming apparatus thus provided can obtain a better image at all times by, even on the bright side of the exposure steps in the adjustment of an exposure amount, preventing a lowering in density of an image, deposition of carriers, and other disadvantages.
REFERENCES:
patent: 4256401 (1981-03-01), Fujimura et al.
patent: 4350435 (1982-09-01), Fiske et al.
patent: 4702590 (1987-10-01), Usami
patent: 4990953 (1991-02-01), Ibuchi
patent: 5146269 (1992-09-01), Shimizu et al.
Beatty Robert
Kabushiki Kaisha Toshiba
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