| 摘要 |
PURPOSE:To improve the toner carriability and stabilize the uniform coating and make the surface hard, by subjecting the surface of a developer supporting member to the alumite treatment and subjecting it to the sand blast treatment with fixed-form grains to form a rugged rough surface. CONSTITUTION:A sleeve 2 as a developer supporting member having a magnetic field generating means internally consists of aluminum, and a hard alumite layer 2a having a thickness of 5-50mu is formed on the surface by the anodic oxidation in a sulfuric acid solution, and the surface of the sleeve is subjected to the sand blast treatment with glass beads as fixed-form (ball-shaped) blast abrasive grains to form a rough surface having a ruggedness pitch of 2-50mu and an average roughness (d) of 0.1-8mu. As fixed-form grains, steel balls and ferrit balls are used besides glass beads. |
