Abstract: A fusing device is provided. The fusing device includes a heating roller having two end regions and an inner region between the two end regions, a coil module, and a controller. The coil module includes a first coil arranged along an axial direction of the heating roller; two second coils, one second coil arranged in each end region of the heating roller; and a third coil arranged in the inner region of the heating roller. The controller controls current directions of currents in the first coil, the second coils, and the third coil.

Abstract: A fusing device is provided. The fusing device includes a heating roller having two end regions and an inner region between the two end regions, a coil module, and a controller. The coil module includes a first coil arranged along an axial direction of the heating roller; two second coils, one second coil arranged in each end region of the heating roller; and a third coil arranged in the inner region of the heating roller. The controller controls current directions of currents in the first coil, the second coils, and the third coil.

Abstract: A fixing device includes a heater; a fixing rotary body having a circumferential surface which paper carrying an unfixed image makes contacts with and passes on, and heated to a predetermined temperature by a heating operation of the heater; a temperature detecting unit which detects the temperature of a portion of the circumferential surface inside a widest paper passage region in an axial direction of the fixing rotary body; a control unit which stops the heating operation of the heater when a temperature detected by the temperature detecting unit exceeds a predetermined overheat temperature; and a measuring unit which measures a continuous heating time from a point of time when the heating operation of the heater starts. The control unit stops the heating operation of the heater when the continuous heating time measured by the measuring unit exceeds a predetermined scheduled heating time.

Abstract: A fixing device includes a heater; a fixing rotary body having a circumferential surface which paper carrying an unfixed image makes contacts with and passes on, and heated to a predetermined temperature by a heating operation of the heater; a temperature detecting unit which detects the temperature of a portion of the circumferential surface inside a widest paper passage region in an axial direction of the fixing rotary body; a control unit which stops the heating operation of the heater when a temperature detected by the temperature detecting unit exceeds a predetermined overheat temperature; and a measuring unit which measures a continuous heating time from a point of time when the heating operation of the heater starts. The control unit stops the heating operation of the heater when the continuous heating time measured by the measuring unit exceeds a predetermined scheduled heating time.

Abstract: A magnetic core as a magnetic material that acts on an electromagnetic characteristic of the generated magnetic field and a magnetic field shield member that shields the magnetic field generated by magnetic field generation unit are structured such that magnetic particles are arranged in a base material under a dispersed state. As a result, a magnetic core in which an inductance can be set and a magnetic field shield member in which magnetic field leakage can be suppressed effectively, as well as an excitation coil, a transformer, electric equipment and an electrophotographic apparatus using them are easily provided at low costs.

Abstract: There are provided (1) a magnetic coil in which magnetic particles 14 form an aggregate and the aggregate of the magnetic particles is disposed in a vessel 12 while the magnetic particles are keeping a particle state, (2) a magnetic field shield member for shielding magnetic field generated from a magnetic field generation member, the magnetic field shield member in which magnetic particles form an aggregate and the aggregate of the magnetic particles is disposed in a vessel 12 while the magnetic particles are keeping a particle state, and an electrophotographic apparatus using them.

Abstract: There are provided (1) a magnetic coil in which magnetic particles 14 form an aggregate and the aggregate of the magnetic particles is disposed in a vessel 12 while the magnetic particles are keeping a particle state, (2) a magnetic field shield member for shielding magnetic field generated from a magnetic field generation member, the magnetic field shield member in which magnetic particles form an aggregate and the aggregate of the magnetic particles is disposed in a vessel 12 while the magnetic particles are keeping a particle state, and an electrophotographic apparatus using them.