| 摘要 |
PURPOSE:To prevent cold air from entering excessively into a heating box through air blowing of a cooling fan by a method wherein when a heating means is driven, an amount of air blowing of the cooling fan is decreased below an amount of air blowing when a magnetron is energized. CONSTITUTION:A hot air heater 8 and a hot air fan 9 constituting a first heating means are installed at a rear surface of a deep wall of a heating box 2 and hot air is blown into the heating box 2 under an electrical energization state of these elements. A magnetron 20 and a magnetron driving circuit 21 are present within a machine chamber 4, and a high frequency is radiated from the magnetron 20 into the heating box 2 under a driving state of the magnetron driving circuit 21. In addition, a cooling fan 22 is installed within the machine chamber 4. In this case, when a range cooking is carried out under a driving of the magnetron 20, a period in which the cooling fan 22 is turned on for 30 seconds and the cooling fan 22 is turned off for 30 seconds is repeated. In addition, when an oven cooking with hot air is carried out, a period in which the cooling fan 22 is turned on for 10 seconds the cooling fan 22 is turned off for 30 seconds under an electrical energization of the hot air heater 8 is repeated. |
