| 摘要 |
PROBLEM TO BE SOLVED: To increase the temperature of a filament, to increase the generated quantity of visible light for improved visibility, to prolong the durability of a vehicle luminaire and to improve reliability by reflecting a wavelength band in a proper range below a specific value and a wavelength band in a proper range above a specific value with a wavelength-selective reflecting film. SOLUTION: A wavelength-selective reflecting film 4 is provided on the outer face side of a bulb 3, and it is laminated with high-refraction factor films and low-refraction factor films in turn. The film thickness is set to 100 nm from a first layer to a seventh layer, and the center wavelength of reflection is set to 400 nm (blue to purple). The film thickness is set to 250 nm from a ninth layer to a fifteenth layer, and the center wavelength of reflection is set to 1000 nm (infrared ray). Luminous efficiency can be improved by the feedback of the reflected infrared rays to a filament 2, and the deterioration of a housing, a reflecting mirror or a lens which is made of a resin member by ultraviolet rays can be reduced.
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