| 摘要 |
<p>PROBLEM TO BE SOLVED: To maintain an awakening degree high during work by alternately realizing a normal illuminance period in which suitable illuminance for the work is provided and a high illuminance period in which the higher illuminance than the illuminance in the normal illuminance period is provided. SOLUTION: In a normal time, medium illuminance as the suitable illuminance for work in a normal illuminance period is maintained, and at every predetermined time the illuminance is heightened causing the occurrence of a high illuminance period. An illuminance change from the normal illuminance period to the high illuminance period is performed so as to rapidly heighten the illuminance, and an illuminance transition from the high illuminance period to the normal illuminance period is performed so as to gradually lower the illuminance. For instance, the illuminance in the normal illuminance period is provided by a base light source 1, and the illuminance in the high illuminance period is secured by adding an auxiliary light source 2 and dimming (lighting) the light source 2. Thereby, an awakening effect resulting from the occurrence of the high illuminance period can be maintained for a long period without its deterioration caused by becoming accustomed thereto, and the occurrence of the deterioration of the awakening degree, and the like resulting from the decrease of the illuminance degree are not allowed so that the high wakening effect can be maintained.</p> |
