Image forming apparatus having developing device including developing rollers with differing flux density and optical writing device using xonality data of four levels or less
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Feb 25, 2003
Grant Date -
Jun 7, 2001
app pub date -
Nov 30, 2000
filing date -
Dec 1, 1999
priority date (Note) -
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Abstract
An image forming apparatus of the present invention includes a developing device including two developing rollers arranged in parallel in a direction in which an image carrier moves each for forming a magnet brush thereon. The magnetic poles of the developing rollers for effecting hand-over of a developer between the rollers are provided with the same polarity. An optical writing device optically writes an image on the image carrier in accordance with tonality data of four levels or less for a single dot. The developing device prevents the developer from moving through a gap between the developing rollers and bringing about irregular image density and background contamination. In addition, the optical writing device successfully obviates ghosts, which are likely to appear when a uniform halftone image including solid portions or bold characters is reproduced.
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