| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent an accident such as a burn which may occur as a user touches a heater when he puts in or takes out a cooked food from a microwave oven, wherein when the surface temperature of a heater is equal to or higher than the reference temperature, and it is judged that a door is open as a door switch is turned on, an alarming is made to inform of this fact. SOLUTION: A controller 90 receives an output signal from a door switch 70 which detects an opening of a door. The controller 90 controls an alarm device 50 in response to a voltage value converted by a temperature sensor 15 which measures the temperature of a heater. For this purpose, the control reference temperature of the temperature sensor 15 is set to 50 deg.C (the maximum value which causes a burn on a human body when he touches a heat source). For example, when a constant voltage of 5V is applied to the temperature sensor 15 of 50 deg.C, a voltage value of equal to or less than 25V is detected in the controller 90. Accordingly, the voltage value applied to the controller 90 is compared with the preset voltage value (25V) and if the voltage value applied to the controller 90 is lower than the preset voltage value, it is judged that the temperature of the heater exceeds the control reference temperature (50 deg.C) and the alarm device 50 is operated.</p> |
