| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a developing device which can obtain satisfactory images without disturbance of a developer layer on a developing roller by reliably scraping off developer on the developing roller, and uniformly convey toner in a developing container, and to provide an image forming apparatus provided with the developing device. <P>SOLUTION: The developing device 14 includes: a regulating member 35 for forming a developer layer region H, where an amount of toner on the developing roller 27 is regulated, by means of the magnetic field formed with a magnetic pole opposite to a fixed magnet body 25 in a developing roller 27; and a magnetic-field generating member 50 for scraping off, on the upstream side of the regulating member 35 in the rotational direction of the developing roller, toner which is not used for development on the developing roller 27. The magnetic-field generating member 50 includes: magnetic-field generating ends 52m and 52n respectively facing the both-ends sides in the longitudinal direction of the developer layer region H; and a magnetic-field generating central portion 52p sandwiched in the longitudinal direction between the respective magnetic-field generating ends 52m and 52n. The magnetic force of the magnetic-field generating ends 52m and 52n is greater than the magnetic force of the magnetic-field generating central portion 52p. <P>COPYRIGHT: (C)2011,JPO&INPIT |
