| 摘要 |
PURPOSE:To obtain good development performance by respectively specifying the content of the magnetic powder in magnetic toner particles and the transporting speed of a developer by the rotation of a sleeve and impressing alternating voltages of a low frequency to the sleeve at the time of forming visual images. CONSTITUTION:The content of the magnetic powder in the particles of the magnetic toner 5 which contains a binder resin and the magnetic powder and has a charge capacity in unidirectional polarization is specified to <50wt.% and the transporting speed of the developer by the rotation of the sleeve 3 is specified to 0.8 to 2.5 times the moving speed of an electrostatic image carrier 1. The alternating voltages of the low frequency are impressed to the sleeve 3 at the time of the formation of the visual images. The high developability is obtd. by impressing the alternating voltages to the sleeve 3 even if the developer is transported at a relatively low speed. |
