| 摘要 |
PURPOSE:To prevent the scattering of toner and carrier by making a light quantity control means for an exposure means vary the quantity of exposed light applied by the use of the exposure means, from the prescribed value to 0 gradually and making a bias control means for a bias applying means vary a bias voltage applied by the use of the bias imparting means to the prescribed voltage value gradually. CONSTITUTION:A high voltage power source circuit 11 which applies a high voltage to a developing unit 4 is connected to the developing unit 4. A control circuit 12 which controls the intensity of a voltage produced by the high voltage power source circuit 11 is connected to the high voltage power source circuit 11. Further, a control circuit 14 which controls the quantity of exposed light is connected to a LED array 3. A CPU(central processing circuit) 13 which gives instructions concerning the contents of controls by the control circuits 9, 12, and 14, instructs the circuit to vary the quantity of exposed light, applied by use of the LED array 3, from the prescribed value to 0, and also instructs the circuit so as to vary a bias voltage, applied to the developing unit 4, to the prescribed voltage value gradually. Thus, scattering of toner and carrier is prevented. |
