| 摘要 |
PURPOSE:To improve operability by energizing a load with power, then holding power energizing state only for predetermined time, and thereafter automatically deenergizing it. CONSTITUTION:A voltage is induced in a secondary coil 12 due to a load current flowing by lighting an illumination lamp 2. If a voltage across both ends of a capacitor 17 is raised, a switching element 18 is closed, and a set coil 19 is energized. Accordingly, the common contact 16 of a relay switch 15 is individually brought into contact with a contact 20, and a common contact 11 of a 3-route changeover switch 4 is individually brought into contact with a contact 9. Thereafter, a common contact 5 of a 3-route changeover switch 3 is individually brought into contact with a contact 7. Thus, the lamp 2 is lit, and a capacitor 21 is charged. When this capacitor 21 is charged to raise a voltage across both ends of the capacitor 21, a switching element 22 is closed, and a reset coil 24 is excited. Thus, the lamp 2 is turned OFF. |
