| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of reducing the number of parts and suppressing useless consumption of a developer. <P>SOLUTION: As shown in the figure, the image forming apparatus A is an electrophotographic type device equipped with a photoreceptor 1, an electrostatic charging roller 2, and a developing roller 31. The device is also provided with a variable output power source 8 for commonly applying voltage to the charging roller 2 and the developing roller 31, a power output controller 9, and a potential device (Zenir diode D1) interposed between the developing roller 31 and the power source 8. When a voltage applied each to the charging roller 2 and the developing roller 31 is made to rise to and fall from a image forming voltage, the controller 9 controls the output of the power source 8 so that the rise and fall of the applied voltage are done using a prescribed time, while a potential difference between the applied voltage to the charging roller 2 and the one to the developing roller 31 is maintained at the potential difference for suppressing the movement of the developer to the photoreceptor 1. <P>COPYRIGHT: (C)2004,JPO |
