| 摘要 |
PROBLEM TO BE SOLVED: To accurately detect a temperature of an object to be heated without being affected by a radiation rate by converting a radiation rate of the object to be heated converted from an output of a light receiving means and converting a temperature of the object to be heated from a light received amount of an infrared ray sensor. SOLUTION: A computing control part 1 gives an instruction to a light emitting control circuit 4 to light a light emitting element, and light reflected in a pan bottom is received by a light receiving sensor 9, is converted into a voltage amount in a reflection detection circuit 6, and is input in the computing control part 1 to calculate a reflectance. The computing equation showing the correlation of a reflectance and an emissivity is set in the computing control part 1 in advance to convert to a emissivity using this computing equation. At the same time, infrared ray radiated from a pan bottom is received by an infrared ray sensor 8, is converted into a voltage amount in a radiation detection circuit 5, and is input in the computing control part 1. Next, temperature calculation equation and temperature calculation equation corresponding to the other emissivity are memorized in the computing control part 1 in advance to calculate a temperature of the pan bottom using this temperature calculation equation. The calculated temperature is compared with a set temperature in a heating control part 2 to increase or decrease a heating amount. |
