Patent ID: 6966653

Claim:
An optical device, comprising: a plurality of optical modulators that respectively modulate each of a plurality of color lights in accordance with image information; a color-combining optical system having a plurality of light-incident sides opposing to the optical modulators, the color-combining optical system combining the color lights modulated by the optical modulators; a plurality of optical converters respectively disposed between the optical modulators and the plurality of light-incident sides; and a cooling device that blows a cooling air to an object to be cooled, the cooling device including a fan body having a vane supported by a rotary shaft of a rotary drive source and a chassis that houses the fan body, the chassis being made of a heat-conductive material and having a heat radiator that radiates the heat generated on the object to be cooled to an outside by heat-conduction, the heat radiator having a trapezoidal cross section along an air-blowing direction of the cooling device, the heat radiator abutting the chassis with a longer side of parallel sides of the trapezoidal cross section, a heat-conductive plate that opposes to the light-irradiation side and conducts the heat generated on the optical modulator and/or the optical converter being provided on the light-incident side of the color-combining optical system, the heat-conductive plate being abutted to the heat-radiator of the chassis of the cooling device.