Developing apparatus
AssigneeCanon Kabushiki Kaisha
InventorSeiji Yamaguchi
Life of this patent
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Abstract
A developing apparatus includes a developer container, having an opening, for containing a magnetic developer; developer carrying member, provided in the opening, for carrying a developer, the developer carrying member having therein magnetic field generating means for carrying the magnetic developer; a sealing magnet for forming a magnetic seal for preventing leakage of the developer at an end portion, wherein an outer end portion of the sealing magnet with respect to a longitudinal direction of the developer carrying member is disposed in a region where a magnetic flux density at a surface of the developer carrying member attenuates.
Claims6
A developing apparatus comprising:
- a developer container, having an opening, for containing a magnetic developer;
- a developer carrying member, provided in the opening, for carrying a developer, said developer carrying member having therein a magnetic field generating means for generating a magnetic field for carrying the magnetic developer on said developer carrying member;
- a sealing magnet for forming a magnetic seal for preventing leakage of the developer at an end portion,
- wherein magnetic flux densities generated by said magnetic field generating means at a surface of said developer carrying member are substantially the same adjacent a central position, in a longitudinal direction of said developer carrying member, of said magnetic field generating means and adjacent a position of an inner end portion of said sealing magnet, and decrease from the position of said inner end portion toward a position of an outer end portion of said sealing magnet.
Dependencies are inferred from the claim text.