| 摘要 |
A projection type image display apparatus has a light source unit ( 11 ) that includes an arc tube ( 110 ) enclosed by a reflector ( 111 ) for reflecting the light emitted from the arc tube in one direction through its opening ( 111 a). The opening ( 111 a) of the reflector ( 111 ) of the light source unit ( 11 ) is covered with a transparent member ( 112 ). Formed in one side of the reflector ( 111 ), adjacent the opening is an air inlet port ( 113 ), while the side facing the air inlet port ( 113 ) is closed (i.e. has no port). Formed in the remaining two sides of the reflector ( 111 ), and adjacent the opening ( 111 <SUP>a</SUP>), are air outlet ports ( 114 ) one for each side. This arrangement causes the cooling air to be uniformly circulated in the entire reflector ( 111 ) of the light source unit ( 11 ) without stagnation to regulate the temperature of the arc tube ( 110 ) in an easy and costless manner, and enables installation of the light source unit ( 11 ) at any angular position, free of angular limitation.
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