| 摘要 |
PURPOSE:To obtain the titled developer in which a sufficient mixture of a magnetic toner and a magnetic carrier are sufficiently mixed and a deterioration of an image density is lessened and a stable image is continuously obtained by controlling an intensity of a magnetization of a magnetic carrier. CONSTITUTION:The thickness of the developer formed on the surface of a sleeve 5 becomes generally thinner every repeating developments whereby the concentration of the toner slowly depresses. The phenomenon as mentioned above, is remarkably influenced by the intensity of the magnetization of the magnetic carrier. The problem as mentioned above, may be solved by controlling the characteristics of the magnetic carrier of the developer 7 in such a manner that the intensity of the magnetization in a magnetic field of 1,000 oersted is controlled to <=60emu/g. Thus, the stable picture image is obtd. without depressing the image density, even if the development is continously and repeatedly effected. |
