| 摘要 |
PROBLEM TO BE SOLVED: To provide a resin-filled ferrite carrier core material, capable of maintaining high charging capability over a long period while maintaining advantages of a resin-filled carrier, and providing a high image quality, and reducing image defects, a ferrite carrier, and an electrophotographic developer using the ferrite carrier. SOLUTION: The resin-filled ferrite carrier core material for electrophotographic developer is composed of a porous ferrite particle, the composition of the porous ferrite particle being represented by formula (1), wherein part of (MgO) and/or (Fe<SB>2</SB>O<SB>3</SB>) is substituted by SrO. The ferrite carrier includes a resin filled in the voids of the ferrite carrier core material. The electrophotographic developer uses the ferrite carrier. COPYRIGHT: (C)2011,JPO&INPIT |
