Fixing device and image forming apparatus

An image forming apparatus comprising:

• a process unit including a developing section, a photosensitive member, and a charger;
• a transfer member for transferring a developer on the photosensitive member to a recording material to form an unfixed image on the recording material;
• and
• a fixing device for heating and fixing the unfixed image onto the recording material,
• wherein the fixing device comprises:
• a heating roller that rotates around a center axis;
• a support extending like a tube along an outer periphery of the heating roller containing both ends in an axial direction of the heating roller and both sides parallel with the axial direction;
• and
• a coil wound around an outer face of the support along the outer periphery of the heating roller containing the both ends in the axial direction of the heating roller and the both sides parallel with the axial direction.

A fixing device comprising:

• a heating body that rotates;
• a pressurization roller that rotates in association with the heating body, the pressurization roller and the heating body nipping and transporting a recording material to fix an unfixed developer onto the recording material;
• an electromagnetic induction heater including a coil wound like a tube via a gap along an outer periphery of the heating body containing both ends in an axial direction orthogonal to a rotational direction of the heating body and both sides parallel with the axial direction so as to form a tubular part, at least a part of the heating body being positioned inside the tubular part of the coil;
• and
• a driving device including a drive source having a rotation shaft outside the coil, the driving device transferring a drive force from the drive source via rotation transfer section to the heating body and the pressurization roller.

An image forming apparatus comprising:

• a process unit including a developing section, a photosensitive member, and a charger;
• a transfer member for transferring a developer on the photosensitive member to a recording material to form an unfixed image on the recording material;
• and
• a fixing device for heating and fixing the unfixed image onto the recording material,
• wherein the fixing device comprises:
• a heating body that rotates;
• a pressurization roller that rotates in association with the heating body, the pressurization roller and the heating body nipping and transporting a recording material to fix the unfixed developer onto the recording material;
• an electromagnetic induction heater including a coil wound like a tube via a gap along an outer periphery of the heating body containing both ends in an axial direction orthogonal to a rotational direction of the heating body and both sides parallel with the axial direction so as to form a tubular part, at least a part of the heating body being positioned inside the tubular part of the coil;
• and
• a driving device including a drive source having a rotation shaft outside the coil, the driving device transferring a drive force from the drive source via rotation transfer section to the heating body and the pressurization roller.

A fixing device comprising:

• a heating roller having a cylindrical support part and magnetic metal foil of a strip wound around an outer peripheral surface of the cylindrical support part;
• a pressurization roller pressed against the heating roller;
• and
• an electromagnetic induction heater that externally heats the heating roller.

An image forming apparatus comprising:

• a process unit including a developing section, a photosensitive member, and a charger;
• a transfer member for transferring a developer on the photosensitive member to a recording material to form an unfixed image on the recording material;
• and
• a fixing device for heating and fixing the unfixed image onto the recording material,
• wherein the fixing device comprises:
• a heating roller having a cylindrical support part and magnetic metal foil of a strip wound around an outer peripheral surface of the cylindrical support part;
• a pressurization roller pressed against the heating roller;
• and
• an electromagnetic induction heater that externally heats the heating roller.