Patent ID: 9482981
Filing Date: 2016-11-01
CPC Classification: G03G

Claim Text:
1. An image forming apparatus capable of forming an image on a print medium while feeding the print medium, the image forming apparatus comprising: an image supporting member; a charger provided in proximity to the image supporting member; a power source unit configured to apply a plurality of charging voltages to the charger sequentially while no print medium is fed, the charging voltages including alternating voltages having different peak-to-peak voltages, respectively; an amperometric detector configured to detect values of the alternating currents flowing in the charger during application of the plurality of charging voltages; and a processor configured to carry out a first charging voltage determination process to determine a peak-to-peak voltage to be used in a process, or a second charging voltage determination process to determine a peak-to-peak voltage to be used in the process selectively based on a detection result of the amperometric detector, the second charging voltage determination process requiring a shorter time to determine the peak-to-peak voltage than the first charging voltage determination process, wherein the processor carries out the first charging voltage determination process or the second charging voltage determination process selectively in accordance with a difference between an ambient temperature at a previous time of carrying out the first charging voltage determination process and a current ambient temperature.