| 摘要 |
A developing device conveys a two-component developer on a first route of circulation and a second route of circulation, and includes a guide plate and an electromagnet that are used for choosing, in accordance with toner densities detected by two toner density detecting sensors respectively provided in the two routes, whether toner supplied from a toner supply device is guided into the first or second route of circulation. This makes it possible to provide an image forming apparatus that, even in cases where a large amount of toner is consumed at one end of a developing roller along the axial direction in a developing device provided with one toner supply opening, can form an image free from nonuniformity in image density or photographic fogs that are caused by nonuniformity in toner density of a two-component developer.
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