| 摘要 |
PURPOSE:To make a magnetic particle circulate appropriately in a vessel by setting as prescribed a magnetic flux density of a magnetic particle detaining magnetic pole and its half-amplitude level. CONSTITUTION:A fixed magnetic field generating means 14 is provided with a magnetic particle detaining magnetic pole 14-1 and a magnetic particle drawing- up magnetic pole 14-2. This magnetic particle detaining magnetic pole 14-1 detains a magnetic particle in a developer supply vessel 13 together with a magnetic particle detaining member 15. In this state, a magnetic flux density of the magnetic particle detaining magnetic pole 14-1 is set to 300-800 gauss, and its half-amplitude level is set to 50-120 degrees centering around a revolving shaft of a developer holding member 12. By setting in this way, an appropriate circulation can be given to the magnetic particle. In this way, the magnetic particle can be made to circulate appropriately in the vessel. |
