| 摘要 |
PROBLEM TO BE SOLVED: To prevent influence on quick evacuation from fire disaster caused by damaging eyes at the time when a person directly sees flash light of an optical alarm device.SOLUTION: An optical alarm device 1 is provided with illuminance sensor 1c; with illuminance detected by the illuminance sensor, controls light-emitting modes such as luminance of a light-emitting element 1a and light-emitting timing; and thereby reduces influence on a person. Control means changes luminance of intermittent flash light emission of the light-emitting element. Further, when the optical alarm device includes a human detection sensor and the human detection sensor does not detect a person, or when the optical alarm device is installed on a fire outbreak story or a right above story, the control means does not change the luminance of the flash light emission of the light-emitting element.SELECTED DRAWING: Figure 2 |
