| 摘要 |
Light, which has been produced by a semiconductor device (11) and has wavelengths falling within the range of 630nm to 680nm, is propagated through a plastic fiber (12) provided with a core (12a) containing a polymethyl methacrylate as a principal constituent. The temperature of the semiconductor device is adjusted by a temperature adjusting system (21) comprising a heater (22) for heating the semiconductor device, a temperature detector (thermistor) (17) for detecting the temperature of the semiconductor device and feeding out a temperature detection signal (S), and a control circuit for controlling actuation of the heater in accordance with the temperature detection signal in order to set the temperature of the semiconductor device at a predetermined target value that is lower than the highest temperature assumed to occur under an environment, in which the semiconductor device is located. <IMAGE> |
