Patent ID: 6966654

Claim:
A projector, constituted by including a light source lamp and comprising: a light source device formed with a light source cooling air flow channel for introducing a cooling air into said internal light source lamp; an illumination optical system for subjecting a light beam emitted from this light source device to an optical processing; and an optical part housing for housing optical elements constituting this illumination optical system; wherein said optical part housing is formed with a pair of optical element cooling opening portions oppositely arranged by mutually pinching said optical elements in order to allow the cooling air to pass through according to the arrangement of said optical elements; and said projector comprising a fan, of which a suction port is opposed to one opening portion from among the pair of optical element cooling opening portions and an exhaust port is connected to said light source cooling air flow channel, wherein an external surface of said optical part housing is formed with a rib-shaped protrusion so as to entirely surround the one opening portion from among the pair of optical element cooling opening portions as well as the suction port of said fan.