| 摘要 |
PROBLEM TO BE SOLVED: To provide, in an incandescent lamp provided with a filament extending in a tube axial direction within a light emitting tube, a structure improved in the light transmission efficiency by enhancing the strength of the light emitting tube to reduce the thickness thereof, and to provide, in an incandescent lamp unit including a plurality of incandescent lamps which are arranged so that the positions of filaments thereof as light-emitting parts are mutually shifted, a structure which will not disturb lights from the light-emitting parts, while enhancing the intensity of each incandescent lamp. SOLUTION: The incandescent lamp includes a reinforcing rib formed on the light emitting tube so as to extend in the tube axial direction. The incandescent lamp unit includes reinforcing ribs provided at positions corresponding internal leads of each light-emitting tube of the plurality of incandescent lamp. COPYRIGHT: (C)2011,JPO&INPIT
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