Patent ID: 8166729

Claim:
A light source device comprising: a light source lamp configured to emit light; and a housing which accommodates therein the light source lamp, wherein the housing includes: a pair of openings formed, along a top and bottom with direction of a luminous flux emission of the light source device; a duct member provided so as to cover the pair of openings, and having an intake through which outside air is introduced from the pair of openings to an air flow channel upstream side; a first air flow guide member provided inside the duct member, the first air flow guide member causing the air introduced from the intake to circulate to either one or the other of the pair of openings via the duct member, the first flow guide member being pivotable under its own weight between a first position and a second position, wherein: when the first flow guide member is in the first position, the air introduced from the intake is directed toward a first opening of the pair of openings and away from a second opening of the pair of openings, and when the first flow guide member is in the second position, the air introduced from the intake is directed toward the second opening of the pair of openings and away from the first opening of the pair of openings; and a pair of second air flow guide members provided in positions in the housing corresponding to each of the pair of openings, each of the pair of second air flow guides causing the air introduced from the corresponding opening to circulate toward the light source lamp.