| 摘要 |
Disclosed is a hot cathode discharge lamp (20) comprising a glass bulb (22) whose cross section perpendicular to the tube axis has a flattened shape, and electrode coils (31a, 31b) arranged within the glass bulb (22) so that the axes thereof are aligned along the major diameter of the flattened shape. The length L of the electrode coils (31a, 31b) in the axis direction satisfies the following relation: L2 < L < L1, with L1 being the major inner diameter of the flattened shape of the glass bulb (22)and L2 being the minor inner diameter thereof. Also disclosed is a backlight unit (5) comprising the hot cathode discharge lamp (20) as a light source.
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