Image forming apparatus with band-pass filters each having passband frequency that is integral multiple of charging bias frequency
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United States of America Patent
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Jan 30, 2018
Grant Date -
Mar 30, 2017
app pub date -
Sep 20, 2016
filing date -
Sep 24, 2015
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Abstract
An image forming apparatus includes a power supply, a detection member, a plurality of band-pass filters, and a setting unit. The power supply outputs a first charging bias having a first frequency or a second charging bias having a second frequency that is an integral submultiple of the first frequency. The detection member detects a current flowing through a charging member. Each of the plurality of band-pass filters receives an output of a current detected by the detection member. The setting unit uses the band-pass filters for both setting of a peak-to-peak voltage of the first charging bias and setting of a peak-to-peak voltage of the second charging bias.
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