| 摘要 |
PROBLEM TO BE SOLVED: To provide a filament lamp including a filament and having high efficiency of converting electric power to visible light.SOLUTION: A filament lamp includes a translucent airtight container, a filament arranged within the translucent airtight container, and a lead wire for supplying current to the filament. The filament includes a substrate formed of a metal material and a visible light absorption film covering the substrate. The visible light absorption film is transparent in an infrared light region. Accordingly, visible light reflectance becomes low and infrared light reflectance becomes high, and thus infrared light radiation is suppressed and visible light luminous flux efficiency can be increased. |
