Electricity: conductors and insulators – Boxes and housings – Hermetic sealed envelope type
Patent
1979-07-12
1981-08-04
Rubinson, Gene Z.
Electricity: conductors and insulators
Boxes and housings
Hermetic sealed envelope type
313184, 313331, 403 29, H01J 500
Patent
active
042823951
ABSTRACT:
To permit direct melting-in of a rod or wire-shaped conductor through a gs wall of quartz glass (thermal coefficient of expansion: 5-6.10.sup.-7 /.degree.C.) in which the wire, for example, is tungsten (thermal coefficient of expansion: 45.10.sup.-7 /.degree.C.), two or more glasses having intermediate thermal coefficients of expansion are melted on, sequentially, on the conductor, and a final glass is applied thereto which, preferably, is the same as the quartz glass of the lamp envelope, and of very short axial length. The axial lengths of the respective glass coatings, sequentially applied, decrease with the first glass having a sufficient length to prevent any overlap of the second glass directly over the conductor, the quartz glass being preferably applied in form of a short cylinder, e.g. 4 mm long, for a 2 mm diameter tungsten conductor rod, so that, when melted together, the further glass layer, or layers, over the first one and the quartz cylinder form a circumferential bead of low heat capacity.
REFERENCES:
patent: 2114869 (1938-04-01), Bol et al.
patent: 2135661 (1938-11-01), Hagen et al.
patent: 3140417 (1964-07-01), Tietze
patent: 3742283 (1973-06-01), Loughridge
Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH
Rubinson Gene Z.
Tone D. A.
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