To improve cooling efficiency and to consequently optimize a radiation effect by improving the form of packaging a liquid crystal panel.
The liquid crystal panel has a flat rectangular shape consisting of plane sections constituting an incident surface and exit surface of the light radiated from outside and end face sections enclosing these sections and functions as a light valve to modulate the incident light and to emit the modulated light. An outer frame 2 has a frame shape constituting side walls 23S and 23B enclosing the end face sections of the liquid crystal panel. The liquid crystal panel elevated in temperature by irradiation with light is cooled by receiving the cooling air blasted from the outside toward the outside surface of the side walls 23B on the lower side. The outer frame 2 is formed with air guiding paths 22 for guiding the cooling air blasted from the outside to the internally housed liquid crystal panel. Fins for radiation may also be formed at the side walls 23S and 23B. The surface area for the radiation may be enlarged by forming stripe-like grooves at the side walls 23S.
SAITO TOMONORI
YAMADA MASASHI
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