| 摘要 |
<p>PURPOSE:To ensure waking by controlling the generation of the alarm sound based on the detected result of a sensor detecting the movement of a human. CONSTITUTION:This infrared sensor 1 is of a pyroelectric type detecting the infrared rays emitted from a human body as the body temperature. When the human body is moved in the detection region, the change of the infrared energy quantity is converted into the electric signal and extracted. A control circuit 2 amplifies the electric signal from the sensor 1 and outputs the human body movement sense signal 31 when the voltage level exceeds the threshold level set on a comparing circuit. A clock unit 12 is constituted of a clock section 3 and an alarm sound generator 5, and a control function receiving the sense signal 31 and stopping the generation of the alarm sound is added to the clock device of the clock section 3. The drive of the alarm sound generator 5 is controlled not to stop the alarm sound until it is sensed that a user wakes from a sleep and gets up from a bed to move.</p> |
