| 摘要 |
PROBLEM TO BE SOLVED: To provide a light source unit that can be safely and comfortably handled even during lighting by reducing the occurrence frequency of deficiency due to heat emitted from a luminous tube. SOLUTION: This light source unit comprises a luminous tube 11, a reflecting mirror 12 arranged to surround it, a lamp box 2 surrounding the outside 12d of the reflecting mirror 12, and an exhaust fan 3 for evacuating air in the lamp box 2, wherein the lamp box comprises an inner face 25 enlarged while maintaining substantially constant intervals with the outside 12d of the reflecting mirror 12, and an inlet port 23 for taking in the outside air. |
