Patent attributes
A developing device includes: a first screw provided in a first carrying path, the first screw rotating so as to simultaneously stir the developer and carry the developer in the first carrying path in a predetermined direction; a second screw provided in a second carrying path, the second screw rotating so as to simultaneously stir the developer and carry the developer in the second carrying path in an opposite direction from the predetermined direction; a first communicating path communicating the first carrying path with the second carrying path; a second communicating path communicating the first carrying path with the second carrying path, the second communicating path being formed downstream of the first communicating path in the opposite direction; and a developer bearing member for bearing the developer in the second carrying path so as to supply the toner included in the developer onto a photoreceptor, the toner being supplied through a supply opening to the first carrying path, wherein the developing device includes a magnet at a position higher than a shaft of the first screw, the magnet forming a magnetic brush from the magnetic carrier in the first carrying path. This reduces problematic scattering of toner and photographic fog in images.
