Lamp having interference film

Details Lamp having interference film Lamp having interference film

1985-10-24

1987-10-20

Moore, David K.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Polarizer or special ray transmission

313580, 350 16, 350166, H01K 126, H01K 132

Patent

active

047016639

ABSTRACT:
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.

REFERENCES:
patent: 2519722 (1950-08-01), Turner
patent: 3325666 (1967-06-01), Bird et al.
patent: 4331901 (1982-05-01), de Vrijer et al.
patent: 4588923 (1986-05-01), Hoegler et al.

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