| 主权项 |
1. An image forming apparatus that forms an image on a medium when the medium is fed through the apparatus, the image forming apparatus comprising:
an image carrying member; a charging unit disposed in proximity to the image carrying member; a power supply unit configured to sequentially apply a plurality of charging voltages to the charging unit when the medium is not fed through, the plurality of charging voltages including AC voltages, respectively, and the AC voltages having different peak-to-peak voltages; a current detecting unit configured to detect an AC value flowing through the charging unit during the application of each of the plurality of charging voltages; a processing unit configured to perform first charging voltage determination control to derive a peak-to-peak voltage value to be used in a process, based on the AC values detected by the current detecting unit; and a storage unit configured to pre-store a reference peak-to-peak voltage value for each wastage level of the image carrying member, wherein the processing unit:
prohibits execution of the first charging voltage determination control according to at least one AC value obtained from the current detecting unit, and performs second charging voltage determination control; andin the second charging voltage determination control, obtains a reference peak-to-peak voltage value associated with a current wastage level of the image carrying member from the storage unit, and derives a peak-to-peak voltage value to be used in the process, based on the obtained reference peak-to-peak voltage value. |
