Sealing structure for light-emitting bulb assembly and method of

Details Sealing structure for light-emitting bulb assembly and method of Sealing structure for light-emitting bulb assembly and method of

1997-06-05

1998-04-21

O'Shea, Sandra L.

Electric lamp and discharge devices

With gas or vapor

Having electrode lead-in or electrode support sealed to...

313624, 313625, 313626, H01J 504

Patent

active

057421234

ABSTRACT:
A sealing structure for a light-emitting bulb assembly includes a closure, having a core which serves as an electrode for sealing an open end of a bulb. The closure includes a bulb-side region disposed adjacent to the open end of the bulb and made of a compositional ingredient having a coefficient of thermal expansion which is substantially the same as that of the bulb, a core-side region disposed adjacent to the core and made of a compositional ingredient having a coefficient of thermal expansion which is substantially the same as that of the core, and an intermediate region disposed between the bulb-side region and the core-side region and made of a compositional ingredient having compositional proportions adjusted such that a coefficient of thermal expansion thereof varies gradually from the coefficient of thermal expansion of the bulb-side region toward the coefficient of thermal expansion of the core-side region. The bulb-side region and the core-side region are separated from each other by the intermediate region and comprise a bulb-side region layer and a core-side region layer, respectively, which are independent of each other. The intermediate region comprises at least one layer whose coefficient of thermal expansion varies gradually from the bulb-side region toward the core-side region. The layers of the closure are progressively thicker from the bulb-side region layer toward the core-side region layer.

REFERENCES:
patent: 3742283 (1973-06-01), Loughridge
patent: 4004173 (1977-01-01), Rigden
patent: 4691142 (1987-09-01), Dohmen

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