Patent ID: 8295752
Filing Date: 2012-10-23
Classification: G03G

Abstract:
1. A fixing device, comprising: a fixing member that includes a conductive layer capable of self-heating by electromagnetic induction; a drive unit that rotationally drives the fixing member; a magnetic field generating member that generates an alternate-current magnetic field intersecting with the conductive layer of the fixing member; a fixation pressing member that is movable so as to come into pressure contact with an outer circumferential surface of the fixing member and to separate from the outer circumferential surface; a temperature measurement unit that includes a temperature detector and a support portion, that measures temperature of the fixing member with the temperature detector which is pressed by the support portion to be brought into contact with an inner circumferential surface of the fixing member, and that holds a contact state between the temperature detector and the inner circumferential surface of the fixing member in every state where the fixing member is displaced in accordance with movement of the fixation pressing member; and a magnetic path forming member that forms a magnetic path of the alternate-current magnetic field generated by the magnetic field generating member, and that conducts heat to the fixing member by self-heating by electromagnetic induction, wherein the temperature measurement unit is arranged at a position adjacent to an upstream edge of the magnetic path forming member at a side where a recording medium exits, and wherein the temperature measurement unit is arranged at any one of a position of a cutout and a position of a hole, any one of the cutout and the hole being formed at the upstream edge of the magnetic path forming member.