Patent ID: 8251513

Claim:
A projector apparatus comprising: a light source; an optical device for modulating a light emitted from the light source according to image information; a projection lens for projecting the light modulated by the optical device as image light; a cooling unit including a cooling part and a radiation part; an optical chamber for housing the optical device; a cooling chamber for housing the cooling part and supplying cold air heat-exchanged by the cooling part to the optical chamber; and a radiation chamber for housing the radiation part, the optical chamber and the cooling chamber connecting with each other through a cold air inlet port and a cold air outlet port while forming respectively heat-insulated spaces enclosed by adiabatic walls, wherein the projector apparatus further comprises opening and closing mechanisms for opening and closing both or one of the cold air inlet port and the cold air outlet port, a cold air circulation is performed in a cooling operation mode by opening the opening and closing mechanisms so that cold air cooled by the cooling part flows into the optical chamber through the cold air inlet port to cool the optical device therein, by means of a cold air circulating blower, and then returns to the cooling chamber through the cold air outlet port, and inflow of moisture in the cooling chamber to the optical chamber is prevented in a stopping mode of the cooling operation by closing the opening and closing mechanisms.