Patent ID: 8007113

Claim:
A projector comprising: an optical component a closed structure having an annular air flow path through which air flows, the closed structure including an optical component housing which accommodates the optical component and has an inlet port through which the air flows to an inside of the optical component housing and an outlet port through which air flows to an outside of the optical component housing, a duct which introduces the air into the optical component housing via the inlet port, including reintroducing back into the inlet port the air previously flowed to the outside of the optical component housing via the outlet port, and a plurality of heat exchangers each of which has a heat receiving side heat transfer member which faces an inside of the closed structure and receives heat from the air inside the closed structure, and a heat releasing side heat transfer member which faces an outside of the closed structure and connects with the heat receiving side heat transfer member such that the heat is transferable from the heat receiving side heat transfer member to the outside of the closed structure, and the plurality of heat exchangers are disposed along the annular air flow path through which the air flows from the inlet port to the inside of the optical component housing to the outside of the optical component housing via the outlet port and back again to the inlet port; and a circulating fan which circulates the air through the annular air flow path.