| 摘要 |
PURPOSE:To provide a transfer device which can optimally stabilize a transfer electric field and a transfer current. CONSTITUTION:A magnetic brush formed by restraining high-resistance fine magnetic grains 5 by the magnetic field of a magnet is used as a transfer member and a toner image formed on the surface of a photosensitive body 10 is transferred on a transfer paper. An RC parallel circuit 30 provided with a variable resistor 31 and a capacitor 32 being a capacitive component is serially connected to a sleeve 3 carrying the magnetic brush and a bias voltage is impressed on the sleeve 3 by a voltage impressing means 7 through the parallel circuit 30. The resistance value of the resistor 31 is controlled by a control signal from a variable control part 34 where the signal of a humidity detection sensor 33 is inputted so that the current flowing through the sleeve 3 is made small by making the larger the resistance of the resistor 31, the higher the detected humidity becomes. |
