Electric lamp having an outwardly extending protrusion

Details Electric lamp having an outwardly extending protrusion Electric lamp having an outwardly extending protrusion

1985-12-10

1987-08-25

Moore, David K.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Polarizer or special ray transmission

313580, H01K 126, H01K 132

Patent

active

046895191

ABSTRACT:
The electric lamp according to the invention has a mainly tubular glass lamp vessel (1) coated with an interference filter (5) of alternating layers of SiO.sub.2 and of a material having a comparatively high refractive index. The lamp vessel 1 has portions at the area of and near its seals (6,7) having a form deviating from the tubular form and is in situ free from the material having a high refractive index of the interference filter (5). As a result, the lamp vessel (1) has a comparatively high resistance to pressure.

REFERENCES:
patent: 4588923 (1986-05-01), Hoegler et al.

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