Fixing device using electromagnetic induction heating and image forming apparatus including same

A fixing device to fix a toner image on a recording medium, comprising:

• a magnetic flux generator configured to generate magnetic flux;
• a heat generating roller including a heat generating layer configured to generate heat by the magnetic flux;
• an elastic layer configured to thermally insulate a metal core;
• a magnetic shunt layer configured to vary magnetism with temperature integrally provided with the heat generating layer;
• and
• a protective layer provided on an inner surface of the magnetic shunt layer and an outer surface of the elastic layer,
• wherein the fixing device fixes an image onto the recording medium by the heat generated by the heat generating roller.

An image forming apparatus, comprising:

• a photoreceptor configured to bear a latent image on a surface thereof;
• a charging device including a charging roller, configured to charge the photoreceptor;
• a developing unit including a developing roller, configured to develop the latent image using toner;
• and
• a fixing device including a heat generating roller including
• a heat generating layer configured to generate heat caused by magnetic flux;
• an elastic layer configured to thermally insulate a metal core;
• a magnetic shunt layer configured to vary magnetism with temperature formed independently of the heat generating layer;
• and
• a protective layer formed at an inner surface of the magnetic shunt layer and an outer surface of the elastic layer,
• wherein the fixing device fixes an image onto a recording medium by the heat generated by the heat generating roller.