| 摘要 |
PROBLEM TO BE SOLVED: To prevent illumination light from obstructing driving by reflecting it on a windshield and a window glass. SOLUTION: This radio telephone system is provided with LEDs 1 and 2 connected in series, whose one end is connected to a power source for illuminating an operating part and a display part inside the system, R1 3 whose one end is connected to the other ends of LEDs 1 and 2 which are connected in series, TR1 5 whose collector is connected to the other end of R1 3 and whose emitter is gounded, R2 4 whose end is connected to one end of R1 3, TR2 6 whose collector is connected to the other end of R2 4 and whose emitter is grounded and a control circuit 7 which transmits a signal 1 to the base of TR1 5 and the signal 2 to the base of TR2 6 so as to give respectively different level signals to the signals 1 and 2 corresponding to the internal state of the system such as an incoming call state, a call originating state and a waiting state. |
