Filament shields

Details Filament shields Filament shields

1974-11-04

1976-06-08

Grimm, Siegfried H.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Light valve or obscuring means

313239, 313333, H01K 126, H01K 118, H01K 702

Patent

active

039625966

ABSTRACT:
A filament shield comprising a body with a recess therein. The recess has a base, which may be planar and from which the filament to be shielded is spaced, and is bounded on two opposed edges by a pair of surfaces. Each of these surfaces has a linear inner edge inclined with respect to an axis along which the filament lies and spaced therefrom, and an outer edge inclined to the axis at a greater angle than the respective inner edge.
A lamp unit comprising a parabolic reflector and a filament shield as defined above, the filament shield being disposed so that the axis of the filament lies on the focal axis of the reflector.

REFERENCES:
patent: 2020130 (1935-11-01), Astor
patent: 2869011 (1959-01-01), Verbeek
patent: 3206595 (1965-09-01), Lollert
patent: 3646385 (1972-02-01), Wichert

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