| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a guide lamp lighting device in which a first priority is given to the role as the guide lamp by lighting a light source (LED) in which there is no abnormality even when there is a short circuit abnormality in the light source (LED) in emergencies such as a blackout and a disaster. <P>SOLUTION: If the short circuit abnormality of the LED constituting the lamp 6 occurs in normal use, supplying a power supply to a constant current circuit 9 is stopped and the priority is given to the protection of the constant current circuit 9. If the short circuit abnormality of the LED constituting the lamp 6 occurs in the emergencies, supplying the power supply to the constant current circuit 9 is made to be continued so as to fulfill the role as the guide lamp. Moreover, if an open abnormality of the LED constituting the lamp 6 occurs in the normal use and in the emergencies, supplying the power source to the constant current circuit 9 of the lamp 6 is stopped and electric power consumption is reduced. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
