Electric lamp with tin or lead alloy plug for lead-in

Details Electric lamp with tin or lead alloy plug for lead-in Electric lamp with tin or lead alloy plug for lead-in

1979-03-08

1980-06-17

Smith, Alfred E.

Electric lamp and discharge devices

Electrode and shield structures

With lead wire or connector

313331, H01J 550

Patent

active

042086078

ABSTRACT:
The invention relates to an electric lamp having a pinch seal in which a molybdenum foil is incorporated as a current leadthrough conductor. An external current conductor is connected to the foil. As a result of differences in coefficients of expansion, a capillary space is present around the external current conductor, through which space oxidizing gas can reach the molybdenum foil. Oxidation of the foil involves an increase of its volume and results in crack of the pinch seal.
In lamps according to the invention a metal plug is provided around the external current conductor, said plug being sealed to said current conductor and to the glass of the pinch seal and sealing the capillary space in a vacuum-tight manner.

REFERENCES:
patent: 3448322 (1969-06-01), Millikan et al.
patent: 4015165 (1977-02-01), Hardies

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