| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lighting device capable of lighting a light source continuously even when abnormalities occur in the light source and notifying outside of the abnormalities of the light source while suppressing increase in cost, and to provide a lighting fixture, a lighting system and a vehicle using the same. <P>SOLUTION: A lighting device 2 has: a lighting circuit part 21 receiving a power supply from a DC power source 1 to output a lighting power to a light source 3; a controller 22 controlling the output of the lighting circuit part 21; and a state detector 23 detecting a state of the light source 3. When the state detector 23 detects abnormalities of the light source 3, the controller 22 controls the lighting circuit part 21 so that an input current to the lighting circuit part 21 becomes half or less as large as at a normal operation while continuing the power supply from the lighting circuit part 21 to the light source 3. As a result, the light source 3 can be made continue to be lightened even when the abnormalities occur in the light source 3. Since the abnormalities of the light source 3 can be detected by detecting the input current to the lighting circuit part 21 outside the lighting device 2, a signal line for notification to the outside can be eliminated, and thereby, increase in cost can be suppressed. <P>COPYRIGHT: (C)2013,JPO&INPIT |
