Patent ID: 6340810
Filing Date: 2002-01-22
Classification: G03G,H05B

Abstract:
A device configured to be heated to a temperature sufficient to fuse an image forming substance to a sheet, comprising:a hollow roller being made of a conductive material and having an inner surface; a coil arranged in a hollow portion of the hollow roller, the coil having a conductor that is configured to carry an electrical current that induces a current in, and heats, the conductive material of the hollow roller; a bobbin being made of an electrically insulating resin, the bobbin arranged inside the coil, a surface of the bobbin having a recess configured to receive at least a portion of the conductor, the recess being a continuous spiral slot extending between ends of the bobbin; and a projecting portion integral with the bobbin disposed between the bobbin and the inner surface of the hollow roller so as to maintain a gap between the hollow roller and the coil, the projecting portion being made of an electrically insulating material, and being arranged on circumferential surfaces of both ends of the bobbin and near a central portion of the bobbin, wherein the conductor of the coil is wound along the bobbin and disposed within the recess so as to form windings of the coil, and the heat produced by said hollow roller is sufficient to fuse the image forming substance when said sheet is exposed to said heat.