| 摘要 |
PROBLEM TO BE SOLVED: To provide an emergency lighting device capable of aiming at power saving both at normal lighting and emergency lighting while observing a specification of an average luminance on a display surface. SOLUTION: The emergency lighting device is provided with a fixture body, a light source La, a display panel 6 with a design pattern 60 for a guiding display, an emergency light source BT, a power source circuit 1, a charging circuit 4 for charging the emergency power source BT, a lighting up circuit 2 which receives power supply from the power sourse circuit 1 or the emergency power source BT and supplies lighting power to the light source La, a power failure detecting circuit 3 for detecting existence of a power failure of a commercial power source AC, and a controlling circuit 7 which has a timer for measuring feeding time to the light source La and controls the lighting circuit 2 for adjusting supplied power to the light source La in accordance with the time measured by the timer so as to control a decrease of light flux accompanying lapse of lighting time of the light source La. The control circuit 7 controls the lighting circuit 2 so as to lower the optical output of the light source La at the emergency lighting more than the optical output of the light source La at normal lighting. COPYRIGHT: (C)2010,JPO&INPIT |
