Electric lamp with a torpedo shaped conductor tip

Details Electric lamp with a torpedo shaped conductor tip Electric lamp with a torpedo shaped conductor tip

1977-05-23

1978-07-18

Smith, Alfred E.

Electric lamp and discharge devices

Incandescent lamps

313 51, 174126R, 339102R, H01K 140

Patent

active

041017986

ABSTRACT:
External cylindrical current conductors of an electric lamp are torpedo-shaped at the end which is welded to a metal foil in a pinch seal of the lamp vessel.
The torpedo-shaped part has a length which is at least equal to the diameter of the cylindrical part, while the diameter of the torpedo-shaped part at a distance from the cylindrical part of 0.9 times the cylinder diameter is at most equal to half the cylinder diameter.
Also when comparatively thick external current conductors, approximately 1.5mm diameter, are used and at a high temperature of the pinch seal, the lamps will withstand cracking. The welded joint of the conductors to the metal foil is stronger than in known lamps.

REFERENCES:
patent: 3549933 (1970-12-01), Smalley
patent: 3668391 (1972-06-01), Kimball

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