developmental role and procedure for manufacture of the same

摘要

A developing roller is provided with a roller core, an electrically conductive layer provided on a circumferential surface of the roller core, and a covering layer provided on the outer circumferential surface of the conductive layer. The covering layer has a thickness of 30 mu m or less, but 0.1 mu m or more, and has at least its surface region formed of a porous body. IMAGE