| 摘要 |
PURPOSE:To stably obtain high quality images at a high speed by using a magnetic toner contg. a magnetic material having >=300 oersted coercive force as the 1st magnetic toner to form a master image. CONSTITUTION:A electrostatic charger 2, an exposing lamp 3 for forming electrostatic latent images, a 1st developing device 4 in which the 1st magnetic toner is housed, a master image fixing device 5, a 2nd developing device 6 in which the 2nd magnetic toner is housed, a pretransfer charger 7, a transfer charger 8 and a magnetic head 9 for magnetizing the master image are successively disposed around a drum 1. The magnetic latent image is formed by magnetizing the master image consisting of the 1st magnetic toner and thereafter, this magnetic latent image is developed by the 2nd magnetic toner and is transferred onto a transfer material P. The magnetic material having >=300 oersted coercive force is incorporated into the 1st magnetic toner. The master image having strong magnetic characteristics is obtd. in this way and the high quality images are obtd. at the high speed. |
