Image forming apparatus and image forming method for adjusting developing bias
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United States of America Patent
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Mar 26, 2013
Grant Date -
Dec 10, 2009
app pub date -
May 28, 2009
filing date -
Jun 10, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
Developing bias is set as follows. An electric field intensity between a developing roller and a photoconductor is set to cause normally-charged toner to fly in an image area and not to cause the toner to fly in a background area. Thus, the normally-charged toner does not fly in the background area. The normally-charged toner caused to fly is therefore unlikely to flick low-charged toner and oppositely-charged toner. The low-charged toner and the oppositely-charged toner will not adhere to the background area and cause image fogging. Accordingly, an image forming apparatus can be provided to prevent the low-charged toner and the oppositely-charged toner from adhering to the background area of an electrostatic latent image on the photoconductor and to avoid the occurrence of image fogging in the background area on a printed material.
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