Gas-filled incandescent lamp with integral fuse assembly

Details Gas-filled incandescent lamp with integral fuse assembly Gas-filled incandescent lamp with integral fuse assembly

1977-10-13

1979-01-02

SMith, Alfred E.

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Electric switch inside evacuated or gas filled envelope

313315, H01K 166, H01J 744

Patent

active

041329228

ABSTRACT:
Protection against potentially destructive arcs which may occur within a gas-filled incandescent lamp when the energized filament fails is achieved by partly embedding separate inner and outer lead-in conductors in an hermetic seal that is formed on one end of the lamp envelope and electrically connecting the conductors by a short uncoiled fuse element that is located within the confines of the envelope and has both of its ends embedded in the seal. In the case of halogen-cycle type lamps that have long useful design lives (in the order of 2000 hours) and press-sealed envelopes, the fuse element comprises a tungsten wire that has a diameter which is more than 10% (and up to about 20%) larger than the diameter of the filament wire and has its ends welded to a pair of molybdenum foil conductors that are embedded in the press seal and connect the fuse wire to the inner and outer lead-in conductors. Reliable arc-suppression is thus achieved in a practical and inexpensive manner with rugged sealed-in components that are readily welded together and made integral parts of the finished lamps.

REFERENCES:
patent: 3211942 (1965-10-01), Wiley
patent: 3211943 (1965-10-01), Cardwell, Jr.
patent: 3211950 (1965-10-01), Cardwell, Jr.
patent: 3274426 (1966-09-01), Scoledge et al.
patent: 3346768 (1967-10-01), Patsch
patent: 3710169 (1973-01-01), T'Jampens et al.
patent: 3727091 (1973-04-01), DeCaro
patent: 3864598 (1975-02-01), Cardwell, Jr.
patent: 3930177 (1975-12-01), Martin
patent: 4066926 (1978-01-01), Newton

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