Image forming apparatus using measured data to adjust the operation level

摘要

An image forming apparatus includes a corona charger, a surface electrometer and a memory provided around a photoreceptor drum. When power supply of the image forming apparatus is turned on, an image adjusting process is carried out. In the image adjusting process, level of charging the corona charger is changed stepwise, the surface potential on the photoreceptor drum at the time is measured by the surface electrometer and the result of measurement is stored in the memory. When image forming process is carried out subsequently, the charge level of the corona charger is set based on the data stored in the memory.