| 摘要 |
A developing apparatus includes a container for containing a developer including magnetic particles. A rotatable developer carrying member is disposed in the container and faced to an image bearing member, for carrying the developer to a developing zone. A magnet is provided in the developer carrying member, and a magnetic sealing member is disposed adjacent to and in a rotational direction of the developer carrying member in a region inside of the container adjacent a longitudinal end of the developer carrying member, wherein the magnetic sealing member cooperates with the magnet to form a magnetic field effective to form a magnetic brush of the developer between the magnetic sealing member and the developer carrying member, and wherein an outer end, with respect to the longitudinal direction of the developer carrying member, of the magnetic sealing member is disposed in a range between 2 mm outwardly away from an end of the magnet and 1 mm inwardly away therefrom.
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