| 摘要 |
PURPOSE:To obtain a carrier which eliminates the leak of a bias voltage, deteriorates a little, and provides a less-edge picture by using granulated powder having such composition that the mole ratio of oxide of specific metal and Fe2O3 is less than a specific value. CONSTITUTION:Granulated powder which has composition shown by a formula (where M; Li, Mn, Ni, Zn, Cd, Cu, Co, or Mg) and a <=0.85mol ratio X/Y is used to manufacture the carrier for electrophotographic development. This carrier has the amount of electrification nearly equal to that of a conventional carrier formed by the oxidation of iron powder without oxidation and resin coating and is usable in combination with any kind of toner. Further, its resistance can be varied by performing reduction and oxidation adequately. A strong resin film is formed on the surface by resin coating to reduce peeling due to a shock greatly. Thus, the carrier which eliminate the leak of the bias voltage, has less deterioration, and forms a less-edge picture is obtained. |
