Photocopying – Contact printing – Light boxes
Patent
1991-08-08
1994-03-08
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355205, 355208, 355246, G03G 2100
Patent
active
052931986
ABSTRACT:
An image forming apparatus has a photoconductive element, a developing sleeve, a photosensor and a control device for controlling the dynamic range of an image. A background output VSG is produced from the photosensor when the photoconductive element is rotating and the developing sleeve is rotating and a background output VSG+ is produced from the photosensor when the photoconductive element is rotating and the developing sleeve is not rotating. The control device controls a developing bias, a charge potential, a quantity of exposing light or an amount of toner supply in response to the greater of the two values VSG or VSG+. Also, the gradient of the background output VSG is determined and is used to decide whether the image forming apparatus is in an unusual state or not.
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Aoki Katsuhiro
Maruta Takayuki
Sawayama Noboru
Beatty Robert
Grimley A. T.
Melser Allen S.
Ricoh & Company, Ltd.
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