Image forming apparatus
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United States of America Patent
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Jan 27, 2004
Grant Date -
Sep 12, 2002
app pub date -
Mar 8, 2002
filing date -
Mar 9, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An image forming apparatus restricts disturbance of a potential patch in the case where a potential sensor for detecting the potential patch is provided downstream of a developing device of a multiple developing roller type so as to enable stable reproduction of a high quality image for a long period. The apparatus includes a potential sensor provided downstream in the moving direction of the image carrier relative to the developing device for detecting a potential on the image carrier, and a controller for setting the developing bias to a value restricting disturbance of a potential portion as an object for potential detection by the potential sensor by the developer when the potential portion passes across the developing device.
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