| 摘要 |
PURPOSE:To prevent toner and a carrier from being dispersed to the outside of a developing device by forming a magnetic shielding plate on an opening end of a casing. CONSTITUTION:An elastic sealing member 14 of which free end contact a photosensitive substance 1 is fitted to the end part of the opening end which is turned to a photosensitive substance 1 on the upper side in the rotational direction of a developing sleeve and the shielding plate 15 consisting of a magnetic material is fixed on the inside of the casing 11 at the end part on the lower side. The shielding plate 15 is arranged so as to be opposed to a magnet 5 in the developing sleeve 2. It is proper to expand the shielding plate 15 up to the whole length of the developing sleeve or the whole width of the casing 11 independently of the length of the magnet 5. The shielding plate 15 is magnetized by the action of the magnet 5 and forms a magnetic field in a gap between the casing 11 and the developing sleeve 3. |
