DEVELOPING DEVICE AND ELECTRIC ENERGY SUPPLY PART FOR APPLYING DEVELOPING BIAS VOLTAGE

摘要

A developing device includes a rotatable developer carrying member (12) for carrying a developer to develop an electrostatic image formed on an image bearing member with a developer; wherein the developer carrying member includes a first cylindrical portion (12) and a second cylindrical portion (100) provided at an end of the first cylindrical portion (12) and supported by a bearing portion (300); a first electroconductive portion (500) extended from an outside of the second cylindrical portion (100) into an inside and electrically connected to an electroconductive portion (600) outside the developing device with a gap from an inner surface (105b) of the second cylindrical portion (100); a second electroconductive portion (400) contacted to an inner surface of the first cylindrical portion and rotatable with the first cylindrical portion and slidable on the first electroconductive portion (500); wherein a developing bias is applied to the first cylindrical portion (12) through the first and second electroconductive portions (500,400) from the electroconductive portion (600) outside of the developing device whereby the slidable contact (401,500a) between the first and second electroconductive portions is positioned within the first cylindrical portion (12). IMAGE