| 摘要 |
PROBLEM TO BE SOLVED: To provide a filament lamp having no unevenness of an irradiation distribution in a tubular axis direction caused by non-light-emitting parts occurring between a filament and a filament. SOLUTION: The filament lamp 1 is provided with a light emitting tube 2 having sealing parts 12a, 12b, a plurality of filament groups 30, 40, 50 arranged in order inside the light emitting tube 2 in a tubular axis direction of the light emitting tube 2, a plurality of filaments electrically connected to compose these filament groups, a pair of internal leads connected to each of the filament groups, and a plurality of metal foils which are connected electrically to the internal leads and are embedded in the sealing parts. Out of the filaments composing the one filament group, a filament which is positioned at an end in the tubular axis direction and is adjacent to the other filament group is located crossing the tubular axis. COPYRIGHT: (C)2011,JPO&INPIT
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