| 摘要 |
PURPOSE:To previously perform the disconnection detection and annuciation of lamps that are used at night, such as a tail lamp and the like and improve their applicability by detecting the disconnection when lamps such as a strap lamp and the like that are used in the daytime are turned on. CONSTITUTION:When a strap lamp switch 4 is turned on, strap lamps 6 light and the output voltage is set to level L when the same lamps are normal. On the other hand, at least one of the lamps 6 is is disconnected, the output voltage of a comparator 12 is set to Level H and a transistor 16 is turned on through a delay hold circuit 14 and then an indicator lamp 5 lights. Besides, when the switch 4 is ON, current flows also to a detection resistor 11 through a diode 8. When at least one of tail lamps 7 is disconnected, the output voltage of a comparator 13 is set to Level H and the indicator 5 lights in the same way as the above. |
