Electric lamp

Details Electric lamp Electric lamp

1979-09-17

1980-11-25

Reynolds, B. A.

Electricity: conductors and insulators

Boxes and housings

Hermetic sealed envelope type

65 59R, 313331, H01K 138

Patent

active

042360455

ABSTRACT:
In electric lamps a type of glass is used for the envelope which, in many cases, has a coefficient of expansion which differs considerably from that of the current supply conductors. Therefore, special measures have to be taken to seal the lamp envelope in a vacuum-tight manner around the current supply conductors.
The invention provides a simple, vacuum-tight seal of a lamp envelope (1), which seal consists of a metal plug (8, 9, 11) which is sealed both to the glass of the lamp envelope (1) and to the current supply wires (4, 5, 10).
The metal plug (8, 9, 11) of 100 parts by weight of a first metal (tin and/or lead) 0.05-1 parts by weight of a second metal (titanium, zirconium, hafnium, niobium, tantalum, and vanadium) has a strong adhering power and a large ductility.

REFERENCES:
patent: 2402927 (1946-06-01), Stupakoff
patent: 2811576 (1957-10-01), Hodgdon et al.
patent: 3007121 (1961-10-01), Schlicke
patent: 3448320 (1969-06-01), Millikan
patent: 3448322 (1969-06-01), Millikan et al.

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