Lamp having interference film

Details Lamp having interference film Lamp having interference film

H - Electricity

01

K

313/84

H01K 1/32 (2006.01) G02B 1/10 (2006.01) G02B 5/28 (2006.01)

Patent

CA 1244075

- 14 - Abstract of the Disclosure A lamp includes a glass bulb sealing a filament therein. A light interference film is formed on a surface of the bulb. The film has at least five layers and is formed by alternately stacking a low-refractive index layer comprising silicon oxide and a high- refractive index layer having a refractive index higher than said low-refractive index layer. The low- refractive index layer contains, at least one additive selected from the group consisting of phosphorus and boron.

493795

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