| 摘要 |
A developing apparatus for an electrophotographic copier or the like includes a cylindrical developing sleeve which is rotatable to transport one component magnetic toner to a predetermined developing region where a photoconductive element is positioned. A magnet layer magnetized to have N and S poles which alternate with each other at a predetermined small distance is provided in the vicinity of the surface of the developing sleeve so as to deposit the toner on the magnetic layer. A blade is pressed against the surface of the magnet layer for frictionally charging the toner which is deposited on the magnet layer. A clearance is defined between the surface of the magnet layer and the blade and sequentially reduced in a direction of rotation of the sleeve, whereby the toner is charged and, at the same time, regulated into an even thin layer.
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