摘要 |
PROBLEM TO BE SOLVED: To allow using as power supply a capacitor which consumes less power and accordingly has a long lighting or twinkling time of a luminous element. SOLUTION: A capacitor 2 of a road marker is charged, and a light emitting element 5 is lighted up with the discharge current of the capacitor 2. The capacitor 2 is connected with the input stage of a DC/DC converter circuit 3, to whose output stage the luminous element 5 is connected, and thereto is also connected an element driver circuit 4 through a constant voltage circuit 6, and the output stage of the driver circuit 4 is connected with the light emitting element 5. The circuit 4 is furnished with a pulse generating means 7 and switching modulating means 8 in such an arrangement that the pulses after switching modulation are given to the output stage of the circuit 4. |