Induction heating and fixing device for fixing toner on a recording medium in an image forming apparatus
AssigneeMinolta Co., Ltd.
InventorsYoshikazu Naito, Akira Takasu, Takahiro Tsujimoto, Kiyohito Tsujihara
Life of this patent
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Abstract
An induction heating and fixing device includes a hollow cylindrical fixing member, a core for forming a closed magnetic circuit, a ring member formed of magnetic material and provided on the core in the vicinity of the bilateral ends of the fixing member, a coil wound around the core, and a pressure member disposed so as to press against the fixing member. This device suppresses temperature drop at the bilateral ends of the fixing roller and maintains uniform temperature distribution in the axial direction of the fixing roller by leaving the device open at both bilateral ends.
Claims19
An induction heating and fixing device comprising:
- a hollow cylindrical fixing member heated by induction;
- a core for forming a closed magnetic circuit, a part of the core being inserted onto the hollow cylindrical fixing member;
- a ring member formed of magnetic material and provided on the core in the vicinity of the bilateral ends of the hollow cylindrical fixing member;
- a coil wound around the core;
- and
- a pressure member disposed so as to press against the hollow cylindrical fixing member.
An induction heating and fixing device comprising:
- a hollow cylindrical fixing member heated by induction;
- a core for forming a closed magnetic circuit, a part of the core being inserted onto the hollow cylindrical fixing member, the magnetic circuit near the bilateral ends of the fixing member being thicker than that of the other part;
- a coil wound around the core;
- and
- a pressure member disposed so as to press against the hollow cylindrical fixing member.
An image forming apparatus comprising:
- an image forming unit for forming toner image on a recording medium;
- and an induction heating and fixing device for fixing the toner image on the recording medium;
- wherein the induction heating and fixing device comprises a hollow cylindrical fixing member heated by induction;
- a core for forming a closed magnetic circuit, a part of the core being inserted onto the hollow cylindrical fixing member;
- a ring member formed of magnetic material and provided on the core in the vicinity of the bilateral ends of the hollow cylindrical
- fixing member;
- a coil wound around the core;
- and a pressure member disposed so as to press against the hollow cylindrical fixing member.
Dependencies are inferred from the claim text.