| 摘要 |
<p>PURPOSE:To assure awakening of a sleeping person by detecting the pressure by the person's body weight and keeping an alarm triggered. CONSTITUTION:A pressure sensitive cord 10 of a pressure detecting part 100 is placed under a mattress or bed sheet and the pressure by the body weight is sent as an electric signal 1 to a signal transmitter 20. The signal is converted to a very weak radio wave 2 in the transmitter. The radio wave is transmitted to a signal receiver 60. Both a time signal 3 from a clock 30 and an alarm time signal 4 from a time setter 40 enter a comparator 50 where the signals are compared. The comparator 50 sends a signal 5 to a controller 70 when the time 3 exceeds the time 4. An alarm on signal 7 is transmitted to an alarm generator 80 to generate the alarm in accordance with the signal 5 while the signal 6 sensing the body weight is kept inputted to the controller 70. The alarm can be transiently turned off by an alarm off switch 90 but the alarm is triggered again to assure the awakening as far as the signal 6 is live.</p> |
