Induction heat fixing device
AssigneeKabushiki Kaisha Toshiba
InventorsSatoshi Kinouchi, Osamu Takagi
Life of this patent
Estimating the term…
Abstract
A fixing device includes a conductive and magnetic hollow roller, a metallic layer made of high thermal conductive material formed on the outer surface of the hollow roller, and a magnetic field generating coil provided in the hollow roller to generate eddy current on the hollow roller. A power source applies high-frequency current to the magnetic field generating coil and a pressure roller contacts the hollow roller in a specified nipping width. Also provided is a fixing device with a second hollow roller fitted to the outer surface of a first hollow roller, a coil provided in the first hollow roller, a current source for selectively applying current of at least two frequencies, and a third roller contacting the second roller in a specified nipping width.
Claims5
A fixing device comprising:
- a heating roller of which surface is covered by a metallic layer;
- a belt made of heat resisting material wound round a pair of rollers and pressed against the heating roller via a specified nipping portion:
- magnetic field generating means arranged opposing to the back of the belt at a portion equivalent to the nipping portion for generating eddy current on the metallic layer of the surface of the heating roller;
- and
- a power source for applying high-frequency current to the magnetic field generating means.
A fixing device comprising:
- a heating roller whose surface is covered by a metallic layer;
- a belt made of a heat resisting material wound around a pair of rollers and pressed against the heating roller via a specified nipping portion;
- a magnetic field generating unit arranged opposed to a back of the belt at a portion equivalent to the nipping portion for generating eddy current on the metallic layer of the surface of the heating roller;
- and
- a power source for applying high-frequency current to the magnetic field generating unit.
Dependencies are inferred from the claim text.