| 摘要 |
PURPOSE:To increase the adhesive strength of a developer to a sleeve and to sufficiently transport and supply the developer to an electrostatic latent image by forming a master image by using the developer formed by mixing two kinds of toners respectively contg. magnetic materials which are different in coercive force. CONSTITUTION:The magnetic developers (T), (T') are respectively housed in the 1st, 2nd developing devices 4, 6. The developer T is used by mixing the toner (T1) having the large coercive force and the toner (T2) having the small coercive force. The photosensitive layer on a photosensitive belt 14 is electrified by an electrifying charger 2 and the electrostatic latent image obtd. by subjecting the layer to image exposing is developed by the developer T. After the image is heat fixed by a flash lamp 5, the image is magnetized by a magnetic head, by which the master image formed with the magnetic latent image is formed. The developer T' is stuck to the master image in succession thereto to form the toner image which is then transferred into the paper P and the image is obtd. The toner T2 is used for the developer T'. |
