| CPC G03G 15/161 (2013.01) [G03G 15/1675 (2013.01); G03G 15/5037 (2013.01)] | 15 Claims |
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1. An image forming apparatus comprising:
a power device;
a photosensitive drum;
a transfer device to remove remaining toner based on a cleaning bias voltage provided from the power device;
an optical sensor to detect remaining toner of the transfer device or the photosensitive drum; and
a processor to:
change a surface potential of the photosensitive drum to a voltage of a set pattern by using the power device,
acquire a size ratio according to a periodic component of a signal determined by the optical sensor, the signal indicative of the remaining toner of the transfer device, based on a frequency of the signal detected from the remaining toner by using the optical sensor,
based on the acquired size ratio according to the periodic component being greater than or equal to a set size ratio, adjust the cleaning bias voltage based on an offset bias voltage corresponding to the acquired size ratio according to the periodic component,
provide the adjusted cleaning bias voltage to the transfer device by using the power device to remove the remaining toner, and
based on the acquired size ratio according to the periodic component being less than the set size ratio, provide the cleaning bias voltage to the transfer device by using the power device to remove the remaining toner.
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