Patent ID: 6032007
Filing Date: 2000-02-29
Classification: G03G

Abstract:
A developing device comprising:a developing container containing a magnetic developer therein;a developer carrying member provided in an opening portion of said developing container for carrying and conveying the developer thereon;a developer carrying magnet provided immovably in said developer carrying member for causing said developer carrying member to carry the developer thereon by its own magnetic force; anda magnetic seal member provided adjacent to end portions of said developer carrying member for effecting sealing of the developer by its own magnetic force;wherein at positions opposed to each magnetic pole of said developer carrying magnet in a sealing area of said magnetic seal member, on a surface of said developer carrying member, a magnitude Fr1 of magnetic force produced by said developer carrying magnet in a normal direction is smaller than magnitude Fr2 of magnetic force produced by said magnetic seal member in a normal direction.