Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Electric switch inside evacuated or gas filled envelope
Patent
1976-10-12
1978-01-03
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
315100, 315107, H01J 744, H01J 1346, H01J 1734, H01J 1978
Patent
active
040669262
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 entirely within the confines of the envelope. In the case of a halogen-cycle type lamp having a press-sealed envelope, the fuse element comprises a tungsten wire which is preferably from about 1% to 10% larger in diameter than the filament wire and is fastened to the inner lead-in conductor at a point located inside the envelope, and to the outer lead-in conductor at a point which is located within the press seal. Reliable arc-suppression is thus achieved in a practical inexpensive manner with rugged components that are readily made integral parts of the finished lamp.
REFERENCES:
patent: 3211943 (1965-10-01), Cardwell, Jr.
patent: 3274426 (1966-09-01), Scoledge et al.
patent: 3743375 (1973-07-01), De Fraeye
patent: 3864598 (1975-02-01), Cardwell, Jr.
Buleza D. S.
Smith Alfred E.
Tyler Edward
Westinghouse Electric Corporation
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