| 摘要 |
PURPOSE:To make it possible to change indication lightness of the switch surface according to the actual use circumstances by building in a circuit for changing current to let flow to a lamp built in a switch into two stages or more. CONSTITUTION:Normally, an input terminal 13c for extinction circuit is not applied with voltage, and a lamp 12 is lit by the voltage applied to the input terminal 13a passing through a diode D, a transistor Tr and a resistance R2. Hereupon, it is so arranged that the voltage is applied from the terminal 13c when a light inside an automobile is turned ON at night, etc. In that case, since the voltage flows to Tr passing through a resistance R1, the path passing through the diode D and the transistor Tr from the terminal 13a is interrupted at Tr. Accordingly, in case that the voltage is applied to the terminal 13c, the current passes through a resistance R3 to light the lamp 12. The resistance value of the resistance R3 at this time is large as compared with the resistance R2 and the lamp 12 becomes less light.
|
