Patent ID: 8794767

Claim:
A liquid-cooling device to cool an optical element in a projector, comprising: an optical element holding member configured to allow a flow of a cooling liquid therein and to hold the optical element so as to transfer heat to the cooling liquid; a liquid pumping unit configured to circulate the cooling liquid; a plurality of liquid circulation members configured to connect the optical element holding member and the liquid pumping unit and to define a flow channel of the cooling liquid; a heat-receiving jacket disposed in the flow channel and having a plurality of fine flow channels which allow flow of the cooling liquid therein; a thermoelectric conversion element having a heat-absorbing surface and a heat-radiating surface, the heat-absorbing surface heat-transferably connected to the heat-receiving jacket; a heat-radiating heat transfer member heat-transferably connected to the heat-radiating surface of the thermoelectric conversion element and radiating heat from the heat-radiating surface; and a support member disposed between the heat-receiving jacket and the heat-radiating heat transfer member, the support member having an outer shape covering the heat-receiving jacket in plane view, and the support member fixing the heat-receiving jacket and the heat-radiating heat transfer member; wherein the support member is formed of a material having a coefficient of thermal conductivity equal to or lower than 0.9 W/(m·K) and includes an opening to fit the thermoelectric conversion element, and the opening of the support member covers a peripheral edge of the thermoelectric conversion element.