| 摘要 |
A pair of openings ( 302 ) symmetrically disposed around an optical axis of the reflector ( 412 ) is formed on a contact surface of a light-transmissive plate ( 301 ) and the reflector ( 412 ) and a cooling channel ( 340 ) for introducing cooling air to a source lamp ( 411 ) through the pair of openings ( 302 ) and a first and a second cooling channel shutters ( 350, 360 ) for shutting the cooling channel ( 340 ) when the case is detached from a projector ( 1 ) are provided on a case ( 300 ). The source lamp ( 411 ) can be efficiently cooled, so that the life of the source lamp ( 411 ) can be lengthened. Even when a light-emitting tube of the source lamp ( 411 ) is exploded while using the projector ( 1 ), the fragments of the light-emitting tube do not fall outside in exchanging the light source ( 413 ), and cooling efficiency of the source lamp ( 411 ) is not impaired.
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