Photocopying – Contact printing – Light boxes
Patent
1994-09-28
1996-02-13
Beatty, Robert
Photocopying
Contact printing
Light boxes
355246, G03G 2100
Patent
active
054915368
ABSTRACT:
An image-quality stabilizer provided in a copying machine executes a feedback control on a charger output based on an adhering toner amount detected by a patch sensor in a pre-rotation of the photoreceptor drum directly before each copying operation is started. A time interval between feedback controls is counted by a timer, and a CPU sets an appropriate time interval in accordance with an amount of change in the adhering toner amount detected by the patch sensor or in accordance with the charger output before and after feedback control. According to the described arrangement, since the feedback control is executed at a timing set in accordance with the amount of change in adhering toner, variations in image quality such as an increase in image density caused by overcompensation and an excessive feedback control can be prevented, thereby ensuring stable image quality by efficiently compensating the image density without increasing an amount of toner consumption.
REFERENCES:
patent: 4571068 (1986-02-01), Tarumi et al.
patent: 5262833 (1993-11-01), Fukushima et al.
patent: 5369473 (1994-11-01), Ogawa et al.
patent: 5394251 (1995-02-01), Aikens
patent: 5416564 (1995-05-01), Thompson et al.
Mashiba Tamaki
Taniguchi Akihiko
Beatty Robert
Conlin David G.
Michaelis Brian L.
Sharp Kabushiki Kaisha
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