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    • 5. 发明专利
    • DEVELOPING DEVICE AND IMAGE FORMING DEVICE
    • JP2001042630A
    • 2001-02-16
    • JP21832799
    • 1999-08-02
    • BRIDGESTONE CORP
    • NAKAJIMA TADASHISAKATA JUNJIMURATA KAZUYAKAWAGOE TAKAHIRO
    • G03G15/08
    • PROBLEM TO BE SOLVED: To form a good image, even under serve environmental conditions and to maintain satisfactory image formation over a long time period, even if image formation is carried out repeatedly by using polyurethane as the principal constituent of each of a developer supporting roller, a developer supplying roller and a developer layer forming blade. SOLUTION: In this developing device, polyurethane is used as the principal constituent for each of a developer support roller, a developer supplying roller and a developer layer forming blade. The polyurethane of the developer carrier roller is a polyurethane elastic body, having 40-80 deg., Asker C hardness, the polyurethane of the developer supplying roller is polyurethane foam having 30-90 deg. Asker F hardness and the polyurethane of the developer layer forming blade is a polyurethane having 30-90 deg. JIS A hardness. The developer supporting roller is obtained, by forming an electrically conductive elastic layer 12 on the periphery of a shaft 11, having satisfactory electrical conductivity and further forming a coating layer 13 on the surface of the electrically conductive elastic layer 12. The electrically conductive elastic layer 12 comprises a polyurethane material provided with electrical conductivity by adding an electrically conductive agent.