IMAGE FORMING APPARATUS

摘要

An image forming apparatus has: an image supporting member, a charger, a power source unit, an amperometric detector, and a processor. The power source unit applies a plurality of charging voltages, which includes alternating voltages respectively, to the charger sequentially while no print medium is fed. The alternating voltages have different peak-to-peak voltages for a forward discharge range and different peak-to-peak voltages for a reverse discharge range, respectively. The amperometric detector detects values of alternating current flowing in the charger during application of the charging voltages. The processor derives characteristic lines of alternating current value with respect to alternating voltage for the forward discharge range and for the reverse discharge range, respectively, from the values detected by the amperometric detector. The processor derives a peak-to-peak voltage to be used in a process in a different way depending on a difference in slope between the characteristic lines.

主权项

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 plurality of alternating voltages having different peak-to-peak voltages for a forward discharge range, in which charge transfer from the charger to the image supporting member occurs, and different peak-to-peak voltages for a reverse discharge range, in which charge transfer from the charger to the image supporting member occurs, respectively; an amperometric detector configured to detect values of alternating current flowing in the charger during application of the plurality of charging voltages; and a processor configured to derive a characteristic line of alternating current value with respect to alternating voltage for the forward discharge range and a characteristic line of alternating current value with respect to alternating voltage for the reverse discharge range from the values of alternating current detected by the amperometric detector, wherein the processor derives a peak-to-peak voltage to be used in a process in a different way depending on a difference in slope between the characteristic line for the forward discharge range and the characteristic line for the reverse discharge range.