| 摘要 |
PURPOSE:To lengthen a transmitting distance without increasing output of a transmitting part by constituting a lighting device of a fluorescent lamp, a transmitting means to generate an infrared signal having plural different wave lengths and a lighting circuit to control the lamp by the output signal of a receiving part. CONSTITUTION:An infrared signal is transmitted from a transmitting means 9, and this is received by a receiving part 2, and a lighting circuit 5 is operated by an output signal from here. At this time, when an argon spectrum is generated in plenty immediately after a lamp 6 is lighted at a low temperature, the first light receiving element L1 is selected by a control circuit 7 and a switching means 8, and when the lamp 6 is put in a stable lighting condition, since the argon spectrum becomes extremely small and mercury spectrum is increased, the second light emitting element L2 is selected. In this way, both influences of two spectra of argon and mercury being a noise component to the infrared signal age reduced, and the infrared signals different respectively to the change reaching lighting stability immediately after lighting are transmitted. |
