| 摘要 |
PURPOSE:To enable formation by coating of a uniform developer layer which is always stable without unevenness over a long period of time by making a developer supporting member harder. CONSTITUTION:A sleeve 2 is formed of an alloy consisting of aluminum as a base and contg. 5-10% chromium. The alloy is subjected to a sandblasting treatment to forma rugged surface 2a on the sleeve 2. When the sleeve 2 is heated together with boron powder in an electric furnace and is boronized, a boron compd. is produced on the surface and the surface hardness increases considerably. If a latent image surface is developed by using such developing device, a toner 3 is extremely satisfactorily coated on the sleeve surface without uneven coating. Even if the sleeve is used for forming a large amt. of image, the always satisfactory image is obtd. without decrease in the imge density and without wear of the sleeve 2 surface. |
