| 摘要 |
PURPOSE:To prevent forgetting of closing and the like by alarming when a door is left opened. CONSTITUTION:Switches 3a-3c are put ON when doors 2a-2c are opened while the switches 3a-3c are put OFF when the doors 2a-2c are closed. A CPU 5 monitors the condition of the switches 3a-3c and when the switches 3a-3c are put ON, the CPU 5 starts a timer circuit 4 to count a time. When a time, counted by the timer circuit 4, has become longer than a given period of time, the CPU 5 outputs an alarming signal. When the alarming signal is outputted, an alarming output circuit 6 outputs alarming sound. According to this method, the alarming sound is outputted when the doors 2a-2c are left opened by forgetting of closing or the like whereby the device can notice the user of the refrigerator that the door is left opened. |
