| 摘要 |
<P>PROBLEM TO BE SOLVED: To appropriately supply a developer charged in a prescribed polarity. <P>SOLUTION: A developer supply device includes the powdery developer to be charged in the prescribed polarity, a casing provided with a developer container at the bottom, and a conveyance board provided in the casing to convey the developer by a traveling wave like electric field. The developer contains base particles having, on the outer surface thereof, an insulating material not having a polar group having the same charging polarity as the prescribed polarity, and an external additive being insulating fine particles having the same charging polarity as the prescribed polarity and being detachably added to the base particles. <P>COPYRIGHT: (C)2012,JPO&INPIT |
