| 摘要 |
PURPOSE:To carry a developer uniformly and form an excellent image by arranging a magnetic member consisting of plural parts with different magnetic attenuation effect in the space between a magnet roller and a nonmagnetic sleeve. CONSTITUTION:The magnetic member 12 is extended in the space between the magnet roller 10 and nonmagnetic sleeve 11 to a partial inner circumference. Magnetic charges are induced in the magnetic member 12 with a magnetic field established by the magnet roller 10 and the magnetic field from the magnetic poles of the magnet roller 10 is concentrated on among the induced magnetic charges, so the magnetic attenuating effect occurs to attenuate the intensity of the magnetic field formed on the nonmagnetic sleeve 11. Consequently, proper magnetic fields are formed corresponding to functions at respective positions of the developing roller to carry the developer uniformly and obtain an excellent image. |
