Patent attributes
An image forming apparatus includes a photosensitive member; a charging device; an exposure device device; a developing device; a transfer charger; a pre-exposure device; a current detector; a calculating device; and a correcting device. The calculating device determines a property formula on the basis of currents, detected by the current detector, flowing between said transfer member, or the charging device, and an area of the photosensitive member charged by the light discharger. The calculating device calculates a correction amount of the correcting device on the basis of the property formula and a current flowing between said transfer member and an area of the photosensitive member charged by the charging device which is supplied with a predetermined DC voltage with discharging by the pre-exposure device.
