Photocopying – Contact printing – Light boxes
Patent
1989-05-04
1991-01-29
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355208, 355326, 355327, 430 43, G03G 2100, G03G 1501
Patent
active
049890433
ABSTRACT:
In a multicolor image-forming apparatus having a photoelectric sensor for detecting the amount of toner of an unfixed toner image adhering onto a photosensitive element, and a toner density sensor for detecting the density of a developer in a developing machine to form a multicolor image by overlapping the toner images having a plurality of colors, a color-balance control method comprises the steps of correcting a setting value of an output of the toner density sensor of the developing machine in accordance with the change in amount of toner adhering onto a photosensitive element detected by the photoelectric sensor with respect to a high density section; setting an allowable range of the toner density in advance in the developing machine with respect to the toner having at least one color; setting the amount of toner adhering onto a photosensitive element of the at least one color as a reference when the toner density is changed outside the allowable range; and correcting the amount of toner adhering onto a photosensitive element of the other color in accordance with the reference. With respect to a half-tone section, the output of the photoelectric sensor may be corrected by controlling the exposure amount. With respect to the high density section, the output of the toner density sensor may be corrected in a predetermined way when the toner density is changed.
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Namekata Shinichi
Oyama Hajime
Sawai Yuji
Suzuki Koji
Yoo Hideo
Grimley A. T.
Ricoh & Company, Ltd.
Smith Matthew S.
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