| 摘要 |
PURPOSE:To reduce the resistance of adhesion generates between a rotating member and toner, and make an image sharp and stabilize development conditions by adhering a specific surface coat layer to the outer circumferential surface of a conductive rotating member which rotates in contact with or closely to the surface of a photosensitive body. CONSTITUTION:A developing device consists of a developing roller 30, supply roller 40, cleaning member 50, tuft height regulating member 60, etc. The developing roller 30 is constituted by forming the conductive coat layer 32 on the surface of the outer circumferential surface of the rotating body 31 made of conductive rubber; and the layer 32 uses the same material with toner 4, e.g. at least one kind of constituent materials constitute the toner 4, and its volume resistance value is controlled to <=10<11>OMEGAcm, preferably, 10<5>-10<9>OMEGAcm similar to the rotating body 31. Consequently, the physical adhesion resistance between the coat layer 32 and toner 4 decreases when the both contact each other and the toner 4 is dislocated easily from the developing roller 30 to a photosensitive body 7 to improve the sharpness of an image. |
