PURPOSE: To permit centralized suction and centralized exhaust of a cooling wind by making a portion which a temperature of an outer surface rises, as small as possible. CONSTITUTION: A duct portion 30 introducing a cooling wind is provided on the back of a mirror 5 so as to surround a circumference of the apparatus, the cooling wind is supplied to a lamp 4 via the duct portion 30. The cooling wind, which has become to a high temperature due to cooling the lamp 4, is gathered into a hollow portion 30a of the duct portion 30 surrounded by the back of the mirror 5 and a plate 10, then, the cooling wind is drawn through the exhaust duct 20. The duct portion 30 is located so as to surround a circumference of the apparatus. Since the cooling wind which has become to a high temperature is gathered into the hollow portion 30a of the duct 30 and is drawn out, the temperature of the circumference of the apparatus can be lowered except for a portion of the exhaust duct 20. Moreover, the structure is such that the cooling wind is supplied from a cooling-wind-introducing inlet 30b and is drawn out through an exhaust outlet 20a, therefore, a circulating-cooling system which carries out the centralized suction and centralized exhaust of cooling wind, can be formed.
展开▼
