| 摘要 |
PURPOSE:To save a power rate and to secure the safety of information equipment by performing time count by receiving a detection signal generated by detecting the fact that the darkness of environment goes less than prescribed darkness, receiving a generated clock signal after the lapse of prescribed time, and disconnecting a main power source. CONSTITUTION:A light detecting means 2 generates the detection signal when the darkness of environment goes less than the prescribed darkness. Then, a clock means 20 receives the detection signal and performs the time count, and generates the clock signal after the lapse of the prescribed time. Then, control means 7, 8 receive the clock signal, and disconnect the main power source of the information equipment. Thereby, since the main power source can be automatically disconnected after the prescribed time when the environment becomes dark even when the disconnection of the power source of the information equipment 1 is forgotten, it is possible to save the power rate, and to improve the safety. |
