JP2005190728A5 - - Google Patents

Claims (8)

Magnetic flux generation means, induction heating element that heats the material to be heated by electromagnetic induction heat generation by the magnetic flux generated by the magnetic flux generation means, and magnetic flux shielding means that shields part of the applied magnetic flux from the magnetic flux generation means to the induction heating element And a heating device comprising: a moving means for moving the magnetic flux shielding means according to a necessary magnetic flux shielding area; and a temperature detecting means for detecting the temperature of the induction heating element.
The magnetic flux generation means, the magnetic flux shielding means, and the temperature detection means are disposed on the opposite side of the induction heating element from the surface that heats the material to be heated, and the temperature detection means is outside the movable region of the magnetic flux shielding means. The heating device is arranged so as to detect the temperature in contact with the surface of the induction heating element.   2. The heating apparatus according to claim 1, wherein the induction heating element has a cylindrical shape, and the magnetic flux shielding means and the temperature detection means are arranged inside the cylindrical induction heating element. .   The heating apparatus according to claim 1 or 2, wherein the magnetic flux shielding means is movable so as to make the magnetic flux shielding area variable according to the size of a material to be heated introduced into the apparatus.   The heating apparatus according to any one of claims 1 to 3, wherein the temperature detection unit is arranged to detect a temperature in an area corresponding to a heated material conveyance area of the induction heating element.   The heating device according to any one of claims 1 to 4, wherein the temperature detection means is a thermistor.   The heating device according to any one of claims 1 to 4, wherein the temperature detection means is a thermo switch.   7. The heating apparatus according to claim 1, wherein the induction heating element is a thermal fixing unit that thermally fixes an unfixed developer image formed on a recording material. 8. An image forming means for forming and carrying an unfixed toner image on a recording material, and an image heating means for fixing the unfixed toner image on the recording material, wherein the image heating means is any one of claims 1 to 7. An image forming apparatus characterized by being a heating apparatus.