摘要 |
PURPOSE:To obtain a high-resolution image with accurate density gradation without any edge effects by providing a layer with specific resistance than a specified value in an image forming member. CONSTITUTION:An electroconductive cylindrical member 2 supporting elecetroconductive powder 1, an image forming member 5 sandwiched between the elecetroconductive powder 1 and a plurally divided electrode head and also a means to transport the image forming member 5 such as rollers 6, 6' are provided. The image forming member 5 is formed by making film 21 with organic polymer material such as polyester or polystylene with a specific resistance of 10<10>OMEGAcm or more and applying thermoplastic elastomer 22 such as ethylene vinylacrylate on the side where the electroconductive powder 1 adheres. Preferably, an electric charge-implanted layer 23 containing compatible materials with a specific resistance of 10<10>OMEGAcm or less, e.g. quaternary ammonium salt, inorganic salts or charge-transferred complex dissolved in a polymer material on the electrode head side, is formed on film 21. |