| 摘要 |
PROBLEM TO BE SOLVED: To provide an incandescent lamp with a long service life for emitting yellow light. SOLUTION: This incandescent lamp has a glass made bulb and emits yellow light. A blue-based light absorbent film is formed on the outer surface of the bulb, an amorphous film made of silicon dioxide containing divanadium pentoxide is laminated on the blue-based light absorbent film, or a two-phase structure film where granular blue-based light absorbent phase is dispersed in amorphous phase made of silicon dioxide containing divanadium pentoxide is formed on the outer surface of the bulb.
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