| 摘要 |
PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of obtaining a minimum necessary peak value which can charge a photoreceptor surface with a desired potential at a low cost based on a result of the existing transfer output detection without performing the detection of a charging direct current.SOLUTION: In the initial operation and the printing standby time after the power supply of a device is ON prior to the processing during electrification by an AC constant voltage power supply 13 and a direct current constant voltage power supply 14 of a high-voltage power source for electrification in an image forming part of the image forming apparatus and the processing of the primary transfer by a direct current constant voltage power supply of the high voltage power supply for primary transfer or by a constant current power supply 15, a control board 10 calculates the primary transfer load impedance Z of a photoreceptor 2 based on the direct current constant voltage power supply detected by a transfer output detection part 16 or based on the direct current voltage related to the power supply 15 or output value (output FB) of the direct current, while changing the output (peak value) of a sinusoidal high voltage alternating current voltage of the power supply 13 and the output of the sinusoidal high voltage alternating current voltage of the power supply 13 in which the primary transfer load impedance Z begins to converge to a constant value is set to the power supply 13 as an alternating current output after adjustment.SELECTED DRAWING: Figure 2 |
