H - Electricity – 01 – J
Patent
H - Electricity
01
J
H01J 61/36 (2006.01) H01J 9/26 (2006.01) H01J 61/30 (2006.01)
Patent
CA 2139839
A sealing structure for a light-emitting bulb as- sembly includes a closure having a core which serves as an electrode and sealing an open end of a bulb. The closure in- cludes 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 adja- cent to the core and made of a compositional ingredient hav- ing a coefficient of thermal expansion which is substantially the same as that of the core, and an intermediate region dis- posed 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 ex- pansion thereof varies gradually from the coefficient of thermal expansion of the bulb-side region toward the coeffi- cient 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 ex- pansion varies gradually from the bulb-side region toward the core-side region. The layers of the closure are progres- sively thicker from the bulb-side region layer toward the core-side region layer.
Dennison Associates
Toto Ltd.
LandOfFree
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