| 摘要 |
PROBLEM TO BE SOLVED: To provide a light source device which efficiently suppresses the temperature elevation of a light source without allowing the infiltration of dust and dirt into the light source device and is excellent in silence. SOLUTION: The outside of a casing 1 provided with a light source section 3 for generating light when emitting light so as to enclose the light source section 3 in a hermetically sealing state is provided with such an air circulation pipeline 2 which circulates the air in the casing 1. The air circulation pipeline 2 is internally provided with a Sirocco fan for circulating the air in the air circulation pipeline 2 and the casing 1. The heated air in the casing 1 is cooled when passing an exhaust duct 9 and a heat exchanger 11.
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