BACKLIGHT UNIT

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PROBLEM TO BE SOLVED : To provide a backlight unit equipped with a sufficient cooling mechanism in spite of a simple structure. SOLUTION : The backlight unit includes a casing 2, a mercury-less rare gas fluorescent lamp 1, an outer tube 15, one cavity part 22a and the other cavity part 22b in which both end portions of the rare gas fluorescent lamp 1 are held and housed, and a cooling mechanism 3. Cooling air supplied from the one cavity part 22a is carried in a gap G formed between the outer surface of the fluorescent lamp 1 and the outer tube 15 and discharged out of the casing 2 via the other cavity part 22b, and an airtight structure is formed in the internal space of the casing 2 so as not to leak the cooling air. COPYRIGHT : (C)2010, JPO&INPIT