| 摘要 |
PURPOSE:To improve developing property, to prevent a charging pattern from being leaked and to charge toner to a required charging level repeatedly by covering a conductive sleeve to be used as a developer supporting member with an insulating layer and contacting a discharging member with the surface of the insulating layer. CONSTITUTION:Since AC voltage is applied between a conductive sleeve 3a and a conductive base body 7b, high resistance toner 10 adsorbed and carried on the insulating sleeve 30 is easily attracted into a charging pattern E on a photosensitive body 7. Even if an foreign substance with low resistance is mixed between a part on which the charging pattern E is formed and the insulating sleeve 30, the charge of the charging pattern E is prevented from leakage to a developing roller 3 because the developing roller 3 is covered with the insulating layer 3b. Since the insulating sleeve 30 is contacted with a destaticizing member 9 connected to the conductive sleeve 3a through a resistor 8, the charge G left in the insulating layer 3b every process of development is destaticized to the external through the conductive member 9 and the toner 10 is frictionized and charged always to a prescribed charging level by frictional contact with the insulating sleeve 30. |
