Image forming apparatus featuring a particle carrying charging member and a developing device including a magnetic field generating device

摘要

An image forming apparatus includes an image bearing member and a charging device for electrically charging the image bearing member. The charging means includes a particle carrying member for receiving a charging bias voltage for carrying electrocondusctive magnetic particles. The particle carrying member is provided with an electrically insulated portion at an end portion within a region in which the magnetic particles are carried. An electrectrostatic image forming device forms an electrostatic image on the image bearing member charged by the charging device. A developing device develops the electrostatic image on the image bearing member. The developing device includes a developer carrying member for carrying a magnetic developer and a magnetic field generating device provided in the developer carrying member wherein the electrically insulating portion is outside a longitudinal end of the magnetic field generating device.