Patent ID: 7446287

Claim:
An induction heating cooker comprising: a top plate configured to place a cooking pot thereon, a heating coil disposed underneath the top plate, an inverter circuit configured to supply a high frequency current to the heating coil, a pot type discriminator configured to judge whether the cooking pot is made of a non-magnetic metal material having a high electrical conductivity comparable to or higher than that of aluminum, or a magnetic metal material or a non-magnetic metal lower in electrical conductivity than aluminum, a buoyancy reducing plate made of a non-magnetic metal having a high electrical conductivity comparable to or higher than that of aluminum, the buoyancy reducing plate being disposed between the top plate and the heating coil and being configured to reduce a buoyancy effective to the cooking pot during induction-heating the cooking pot, an infrared sensor configured to detect an infrared radiation, the infrared radiation being radiated from the cooking pot and going through the top plate, a temperature calculator configured to calculate a temperature of the cooking pot from an output of the infrared sensor, and a controller configured to control an output of the inverter circuit in accordance with a temperature calculated by the temperature calculator, and to nullify a temperature calculation made by the temperature calculator when the pot type discriminator judges that the cooking pot is made of a non-magnetic metal material having a high electrical conductivity comparable to or higher than that of aluminum.