Method and apparatus for controlling image density for use in co

Details Method and apparatus for controlling image density for use in co Method and apparatus for controlling image density for use in co

1996-07-11

1998-03-31

Moses, R. L.

Electrophotography

Control of electrophotography process

Responsive to copy media characteristic

399 46, 399 55, G03G 1504, G03G 1505, G03G 1522

Patent

active

057349479

ABSTRACT:
A method and apparatus for controlling the image density of a copy of a special document original with a large image density variation. When a special document original is to be copied, the surface potential of a photoreceptor is set to a level lower by a predetermined value than that employed for an ordinary document original copying operation. Thus, the image density of the resulting copy is comprehensively reduced, and the image density variation in the copy is moderated. Further, the amount of light emitted from the light source for illumination of the document original is set to a predetermined level adapted for a low density document original. Thus, the image density of the copy is prevented from being reduced too much. The level of development bias to be applied to a developing unit corresponding to at least a predetermined standard density level is set to a level higher by a predetermined value than that employed for an ordinary document original copying operation. Thus, the fogging of the resulting copy image can be suppressed.

REFERENCES:
patent: 5206686 (1993-04-01), Fukui et al.
patent: 5282000 (1994-01-01), Miyake et al.
patent: 5294959 (1994-03-01), Nagao et al.
patent: 5303006 (1994-04-01), Mizude
patent: 5400120 (1995-03-01), Narazaki et al.
patent: 5455657 (1995-10-01), Takeda
patent: 5499079 (1996-03-01), Kinoshita et al.

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