| 摘要 |
PURPOSE:To enhance feedback of infrared rays emitted from filaments by forming a visible light reflecting film in a bulb so as to reflect visible light emitted in the specific direction from at least one of two filaments. CONSTITUTION:Halogen gas is sealed inside a spherical part 2 and a cylinder part 3, and a filament 5 for a low beam and a filament 6 for a high beam are housed. The low beam filament 5 is arranged in a central part of the spherical part 2. Visible light emitted toward an upper side spherical surface part of the spherical part 2 from the low beam filament 5 is emitted from the upper side spherical surface part by passing through a bulb 1 and an infrared ray reflecting film 16. On the other hand, visible light emitted toward a lower side spherical surface part of the spherical part 2 from the filament 5 is reflected by a visible light reflecting film 19 formed in the lower side spherical surface part of the spherical part 2, and is emitted from the upper side spherical surface part of the shperical part 2. Thereby, beedback efficiency of infrared rays emitted from the filament 5 can be enhanced. |
