摘要:
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.
摘要:
For coupling a halogen incandescent lamp to a plastic lamp base in correct positional relationship, a sheet-metal lamp holder is rigidly engaged with a hermetic end seal of the lamp, and a sheet-metal sleeve is anchored in the lamp base. The sleeve has several connecting fingers extending therefrom for somewhat loose engagement in openings in the lamp holder. The loose engagement of the sleeve fingers in the lamp holder openings permit adjustment of the positions of the lamp and the lamp base, which are secured respectively to the lamp holder and to the lamp base, with respect to each other. The sleeve fingers are welded to the lamp holder following the adjustment of the positional relationship between the lamp and the lamp holder.