Electric lamp and discharge devices – With envelope – Having base and connector
Patent
1991-07-18
1992-09-01
DeMeo, Palmer C.
Electric lamp and discharge devices
With envelope
Having base and connector
313332, 313623, 313634, H01J 6130, H01J 6136
Patent
active
051441926
ABSTRACT:
To prevent electrolytic current flow between adjacent sealing foils (6,7; 15) within a pinch seal (10, 13) at the operating temperature of the pinch seal, in operation of the lamp, the pinch seal is formed with a pinch seal section which has a thickness which is reduced with respect to the pinch seal outside of the region between the foils, for example in form of a slit or a notch or a thin quartz glass web of, at the most, 3 mm thickness. This reduced section, thus, has a resistance which is a multiple of the resistance which the pinch seal, between the foils, would have if the pinch seal would be of uniform thickness throughout its cross section; this reduced section (11, 18) starts at the outer terminal end of the pinch seal (10, 13) and extends up to at least about the ends of the foils (6, 7; 14, 15) proximate to said bulb portion.
REFERENCES:
patent: 3025426 (1962-03-01), Camarata
patent: 3351802 (1967-11-01), Gates
patent: 3906275 (1975-09-01), Spiessens et al.
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patent: 4979082 (1990-12-01), Devir
patent: 5001395 (1991-03-01), Barthelmes et al.
"Electric Discharge Lamps" by John F. Waymouth, M.I.T. Press (1971).
DeMeo Palmer C.
Patent Treuhand Gesellschaft fur elektrische Glunlampen m.b.H.
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