| 摘要 |
A projector includes: an optical component; a sealed structure that includes an optical component casing accommodating the optical component inside, a cooling device, a plurality of duct members including a flow-path-upstream-side duct member that guides the air from the cooling device to the optical component casing, and a ringed air flow passage defined by the duct members, the optical component casing including an air inlet for introducing air into the optical component casing and an air outlet for exhausting the air to an outside of the optical component casing, the cooling device including a thermoelectric conversion element having a heat absorbing surface that faces an inside of the sealed structure and a heat releasing surface that faces an outside of the sealed structure, the duct members introducing the air into the optical component casing via the air inlet and re-introducing the air that is exhausted from the inside to the outside of the optical component casing via the air outlet again into the optical component casing via the air inlet, the flow-path-upstream-side duct member formed of a material having a heat conductivity of equal to or lower than 0.9 W/(m·k), the optical component disposed in the air flow passage, the air flow passage allowing the air circulating therein; and a circulation fan that circulates the air in the ringed air flow passage, the circulation fan disposed on a downstream side of the cooling device and an upstream side of the optical component casing along an air-flowing direction in the air flow passage.
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