| 摘要 |
<P>PROBLEM TO BE SOLVED: To relatively accurately acquire a temperature of an optical member of a lighting device with good responsiveness without intercepting an optical path of illuminating light. <P>SOLUTION: A first temperature sensor of a lighting device is disposed on the rear surface side of a reflecting surface of a reflector and acquires an ambient temperature of a light source part through the reflector. A second temperature sensor acquires an environmental temperature around the device. A temperature estimation unit uses the ambient temperature of the light source part, which is acquired by the first temperature sensor, and the environmental temperature to estimate a temperature of an optical member. <P>COPYRIGHT: (C)2013,JPO&INPIT |
