| 摘要 |
PURPOSE:To achieve high-performance development stable for a long period by roughening the surface of a supporting member for a single-component magnetic developer to specific surface roughness and then by performing hard plating. CONSTITUTION:A developer support member (sleeve) 2 having a fixed magnet part 4 consisting of magnets N1, S1, N2, S2, N3, and S3 internally is made of stainless steel, and sand blast treatment is performed by using #300 granularity irregular grains of sillicon carbide, etc., to form a roughened surface which has 2-50mum pitch unevenness, and 0.1-8mum mean roughness (d). Then, the stainless steel surface is treated by hard plating 2a with hard chromium. Consequently, the development of a latent image formed on the surface of a photosensitive drum 5 has no application irregularity of toner even after tens of thousands of copies are taken continuously, obtaining excellent copied images. Thus, a sleeve 2 which has superior wear resistance and excellent durability is obtained. |
