| 摘要 |
PURPOSE:To enable the effective electrostatic charging of a nonmagnetic toner and holding of the toner on a specific developing sleeve and to enable the formation of a sharp image of a high density without having fogging by using the above-mentioned developing sleeve. CONSTITUTION:The sleeve 1 consists of a conductive sleeve base body 2 and a coated film 3 of a metal oxide particle/high-polymer resin dispersion provided on the surface of the base body 2. The metal oxide particles 4 have 3-100mum grain size, <=10<10>OMEGA-cm specific volume resistivity and positive electrostatic chargeability and are dispersed into the high-polymer resin dispersion medium 5. Projecting parts 6 and recesses 7 are formed in the coated film 3. The roughness by the rugged parts exists in a 5-20mum range and the surface of the coated film is held electrically conducted to the sleeve base body 2 through the metal oxide particles 4 dispersed in the coated film. Since only the nonmagnetic toner can be thereby supplied onto the developing sleeve 1, the electrostatic charging of the nonmagnetic toner and the holding of the toner onto the sleeve 1 as well as the effective carrying of the sleeve in the development area are executed. The sharp image of the high density without having the fogging is thus formed. |
