| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus having a developing device that can correct an error of measurement by optical detection of a developer conveyance amount and reduce stress to a developer. <P>SOLUTION: Disclosed is the image forming apparatus in which the developing device having an optical sensor detecting the developer conveyance amount is arranged opposite a developing sleeve rotating while carrying a developer layer, the image forming apparatus being characterized in that the developer layer is formed by being moved to the developing sleeve through a developer supply roller in the developing device and the developer conveyance amount on the developing sleeve is calculated from a measured value A detected by the optical sensor during developer conveyance and a measured value B detected in the absence of a developer on the developing sleeve. <P>COPYRIGHT: (C)2007,JPO&INPIT |
