Optical device and projector

摘要

An optical device (44) includes an optical modulator holder (4402) having a cooling chamber, in which cooling fluid is sealed therein, for holding the optical modulator in the thermally conductive state for the cooling fluid in the cooling chamber, a plurality of fluid circulating members (448) communicated to the cooling chamber of the optical modulator holder for guiding said cooling fluid to the outside of said cooling chamber and again guiding the cooling fluid to the inside of the cooling chamber, and a cooling fluid accumulating section provided in flow path of the cooling fluid of the plurality of fluid circulating members for accumulating therein the cooling fluid; in which the cooling fluid accumulating section includes a main tank 445 and a fluid branching section 4401 provided in the upstream of the cooling fluid against the optical modulator holder and a downstream-side cooling fluid accumulating section provided in the downstream of the cooling fluid against the optical modulator holder.