Image forming unit, process cartridge, and image forming apparatus

摘要

An image forming apparatus includes a plurality of toner-image forming units. Each toner-image forming unit includes a photosensitive drum (1) and a charging unit (2) that is arranged to abut against or remain detached from the photosensitive drum (1), and that electrically charges the photosensitive drum (1). Each of the toner-image forming units forms an image of a different color. At least one of the charging units (2) functions as a corona charging unit (2) and at least another one of the charging units (2) functions as a non-contact charging unit.