| 摘要 |
<p>PROBLEM TO BE SOLVED: To switch a load to an auxiliary lamp when a dimmed state of a main illumination lamp reaches the lower limit, depending on a light dimmer signal for darkning sent by the operation of remote controller, and still the light dimmer signal for darkning is continuously sent for a certain period. SOLUTION: The lighting device is composed of a fluorescent lamp 3 as a main illumination lamp operated on a high frequency voltage of an inverter circuit, an auxiliary small lighting bulb 4 connected to commercial power source, and a light switching control circuit 10 which judges the lower limit of lighting control of the main illumination lamp depending on the lighting control signal of a lighting control circuit, and outputs turn-off signal to the lighting control circuit and turn-on signal to an auxiliary light control circuit when light dimmer signal is sent from a remote-controlled transmitter after making a state of lower limit continue for a certain period depending on the lower limit judging signal from a lower limit judging circuit.</p> |
