| 摘要 |
PURPOSE:To prevent the generation of image unevenness by finely dividing the surface of a sleeve into superconducting members and non-magnetic members and allowing the superconducting members to interrupt magnetic force by Meissner effect repulsing the magnetic force. CONSTITUTION:When the surface of the sleeve is finely divided into the surperconducting members 1 and the non-magnetic members 2, magnetic flux is partially interrupted by the superconducting members 1 and the magnetic flux 7 is converted into the non-magnetic members 2. Thereby, the density of the magnetic flux is increased and magnetic force is also increased, so that the quantity of toner supply to the sleeve can be increased and a chain-like ear 4 formed by toner can be extended. Consequently, image density can be increased, the adhesion of excess toner to a white part can be suppressed and the generation of image unevenness due to mechanical tolerance can be prevented by extending a distance between a photosensitive body and the sleeve. |
