| 摘要 |
PURPOSE:To help an user to go to sleep by lowering the illuminance of a bed room to darkness meeting the demand of the user. CONSTITUTION:A timer circuit 3 is provided, which controls the brightness of a ceiling light 1 via a resistance circuit 2. The timer circuit 3 allows brightness to be attenuated in sympathy with the process of darkness meeting the demand of an user by outputting a second control signal corresponding to darkness meeting the demand of the rod of the user after a first control signal corresponding to darkness meeting the demand of the pyramid of the user has been outputted. |
