TUBULAR DEVELOPING ROLLER, METHOD OF PREPARING THE SAME, AND ELECTROPHOTOGRAPHIC IMAGING APPARATUS COMPRISING THE SAME

摘要

An elastic tubular roller includes an inner foam layer (12) and an outer tubular layer (13). The inner foam layer has a higher electrical resistance than the outer tubular layer, and the electrical resistance of the entire tubular roller is equal to or less than 10 8 ©. A method of manufacturing the same and an electrophotographic image forming apparatus using the same are described. The tubular roller is used as various kinds of electrophotographic image forming apparatuses, such as a contact non-magnetic one-component type and a magnetic two-component type, and as well as an electrical charging roller and a developing roller.