Developing apparatus of magnetic brush type for electrophotographic reproduction

摘要

A developing apparatus of the magnetic brush type including an electrical conductive cylindrical member adapted to form heads of a developer and a means for applying a d.c. bias voltage to the heads of the developer. A d.c. bias voltage is connected to said cylindrical member and said means for applying bias voltage, and said d.c. bias voltage applied to said cylindrical member is of the same polarity and magnitude as that being applied to said d.c. bias voltage applying means.