Arc tube having a pair of molybdenum foils, and method for its f

Details Arc tube having a pair of molybdenum foils, and method for its f Arc tube having a pair of molybdenum foils, and method for its f

1997-03-11

1999-08-10

Ramsey, Kenneth J.

Electric lamp and discharge devices

With gas or vapor

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

445 43, H01J 538, H01J 932

Patent

active

059363495

ABSTRACT:
The invention is directed to preventing occurrence of molybdenum foil breakage during a pinch sealing operation in a method of fabricating an arc tube having a pair of molybdenum foils pinch-sealed on both sides of a spherical portion of a glass tube by sequentially pinch-sealing the respective molybdenum foils. A first molybdenum foil is not pinch-sealed (first pinch seal) with an inert gas introduced into a glass tube as in a conventional embodiment, but is pinch-sealed with the internal pressure of the glass tube maintained at a vacuum of 0.5 torr or less. As a result, oxidation of the molybdenum foils causing breakage of the molybdenum foils during a pinch sealing operation is minimized. Hence, an arc tube having each of a pair of molybdenum foils made of molybdenum whose purity is 99.95% or more and with a thickness of 20 .mu.m or less can be fabricated.

REFERENCES:
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patent: 4136298 (1979-01-01), Hansler
patent: 4389201 (1983-06-01), Hansler et al.
patent: 4419602 (1983-12-01), Mitamura et al.
patent: 5277639 (1994-01-01), Nagata et al.
patent: 5286227 (1994-02-01), Numajiri et al.
patent: 5505648 (1996-04-01), Nagasawa et al.
patent: 5527199 (1996-06-01), Feder et al.
(Mitsubishi Denki K.K.).

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