| 摘要 |
PROBLEM TO BE SOLVED: To perform excellent image output in an image forming device by obtaining an electrification failure uncausal uniform electrifying characteristic by preventing magnetic particles to constitute a magnetic brush from sticking on an electrified object surface by electrification contrast, and performing electrification which does not leak even if a pinhole exists on an electrified object, in contact electrification and injection electrification using the magnetic brush as an electrifying member. SOLUTION: A brush composed of a magnetic particle 23 is held in a cavity of a magnetic circuit, and a resistance value of the magnetic particle 23 is 1×10<5> to 1×10<12>Ωin the case of electrification by discharge in impression voltage 1 to 1000V, and is 1×10<4> to 1×10<7>Ωin the case of injection electrification, and a particle diameter of the magnetic particle is 10μm to 100μm, and maximum magnetic field intensity of the cavity of the magnetic circuit is constituted so as to be 1000×10<-4> to 10000×10<-4> T.
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