Abstract: There is disclosed an image heating device including a heater in which a heat generating element and electrodes to supply a current to the heat generating element are provided on a longitudinal substrate, a film adapted to be slid with the heater, and a back-up member for form a nip together with the through the film. A recording member bearing an image is pinched and conveyed and the image is heated by a heat from the heater through the film in the nip. The heater has a mark in at least an edge portion in the longitudinal direction.

Abstract: A fixing apparatus includes a movable member: a rotatable member for forming a nip with the movable member; wherein a recording material carrying an unfixed toner image is fed by the nip therethrough, and the unfixed toner image is fixed while it is being fed thereby; wherein the rotatable member comprises an electroconductive core, a low resistance layer electrically connected with the core and provided outside the core, and an insulation layer outside the low resistance layer; means for applying a bias voltage to the core of the rotatable member; an insulation member for covering an end surface of the low resistance layer of the rotatable member.

Abstract: An image forming apparatus includes an image bearing member; a charging member contactable the image bearing member to charge the image bearing member at a charging position; wherein an AC current applied to the charging member is constant-current-controlled when a region of the image bearing member which is going to be an image formation region is at the charging position, and wherein a current flowing through the charging member is detected when a region of the image bearing member which is going to be a non-image-formation region is at the charging position, and the AC current is determined on the basis of the detected current.