Developing device having magnetic seals

摘要

A developing device includes a developer container containing magnetic particles; a developer holding unit formed at an opening portion of the developer container, the developer holding unit rotating while holding a developer; a magnetic field generating unit placed in the developer holding unit; a magnet placed along a circumferential direction of the developer holding unit to form a magnetic seal between the magnet and the developer holding unit; and a magnetic unit placed to be adjacent to the magnet. The developing device attains a reduction in driving torque and a high magnetic sealing performance.