赤外線反射膜付き電球の効率

下垣 光太郎, 祝 郁夫, 吉池 久夫

doi:10.2150/jieij1980.68.2_72

赤外線反射膜付き電球の効率

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下垣光太郎

岩崎電気 (株) 開発部
祝郁夫

岩崎電気 (株) 開発部
吉池久夫

岩崎電気 (株) 開発部

書誌事項

タイトル別名

The Luminous Efficacy of an Incandescent Lamp Which has an Infrared Reflective Film
セキガイセンハンシャマクツキデンキュウノコウリツ

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抄録

An energy conserving incandescent lamp which the infrared reflective film has been studied. This lamp can be called the heat mirror lamp, because it has an envelope internally coated with a multilayer heat refl ective mirror such as consisting of Ti0₂-Ag-Ti0₂. A theoretical formula which led the luminous efficacy and the energy conserving ratio of the lamp could be found. Those are depend on the spectral transmittance and reflectance of the heat mirror, the spectral emissivity of the radiator and the geometrical factor of the lamp components. In case of the spherical envelope lamp with tungsten coiled coil filament at the center, a geometrical factor of 0.63 has been experimentally obtained, and the luminous efficacy of 27 lm/W can be expected by using the Ti0₂-Ag-Ti0₂ film coated lamp. An experimental luminous efficacy of the lamp with a bulb internally coated with a thin gold film almost coincides with the results of theoretical calculations.