| 摘要 |
<p>PURPOSE:To automatically turn a lighting system off simultaneously with a person going out even in the dark early morning and automatically turn the system on surely in the evening by installing a switch of an electric power source circuit, an open control circuit, a close control circuit, and a close retaining circuit for an interior lighting system in an automatically turning on/off circuit. CONSTITUTION:An automatically turning on/off circuit 4 has a switch 4 for an electric power source circuit of an interior lighting system 1, an open control circuit 7, a close control circuit, and a close retaining circuit 9. The circuit 8 carries out close control of a switch 6 in the case the luminous intensity 3 changes from a first standard luminous intensity which is lower than the ambient luminous intensity in the interior at the time of the lighting system 1 is turned on to a second standard luminous intensity or lower which is lower than the first standard luminous intensity. The circuit 9 keeps the close state of the switch 6 which is controlled to be closed in the case the luminous intensity 3 becomes a third standard luminous intensity or lower which is higher than the first standard luminous intensity. When the switch 5 is switched to a contact point 11, the switch 6 is controlled to be open and the lighting system 1 is not automatically turned on even in dark' early moning and is surely turned on automatically in the evening and the switch 6 keeps closed state by the circuit 9 in the case the luminous intensity is equal to or less than the third standard and thus automatic turning off due to interior illuminating light can be prevented.</p> |
