| 摘要 |
PROBLEM TO BE SOLVED: To provide a bulb for an automobile having a novel structure sufficiently endurable against vibration in automobile travel. SOLUTION: This bulb is composed of a one-end sealed type light emitting tube 11 composed of glass mainly composed of quartz, two ore more power supply lead wires 15a and 15b extending in this light emitting tube 11, and one or plural filament coils 14 forming the light emitting part 11, having one end connected to one lead wire 15a, having the other end connected to the other lead wire 15b, and mainly composed of tungsten. The filament coils 14 are 25 g/mm or more in a spring constant, and is 100 mg or less in weight. |
