Incandescent lamp with improved press seal

Details Incandescent lamp with improved press seal Incandescent lamp with improved press seal

1984-05-17

1986-05-06

Dixon, Harold

Electric lamp and discharge devices

Electrode and shield structures

With lead wire or connector

174 5064, 313332, H01J 550

Patent

active

045874549

ABSTRACT:
An improved electric lamp including an envelope of high silica glass material having a press sealed end wherein there is embedded a thin molybdenum foil which in turn forms part of the lamp's lead-in wire assembly. Crack formation in the area of the interface between the foil's external longitudinal surfaces and the compressed glass material is substantially prevented by providing the longitudinal sides of the foil with rough surfaces to assure substantial adhesion between the glass material and foil when the press sealed end is subjected to elevated temperatures (e.g., during pressing and/or subsequent lamp operation). These rough surfaces are provided by exposing the longitudinal sides of the foil to a sandblasting operation.

REFERENCES:
patent: 2227511 (1941-01-01), Reynold
patent: 2786882 (1957-03-01), Krefft
patent: 3105867 (1963-10-01), Meijer

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