Metal-halide discharge lamp with ceramic discharge vessel, and m

Details Metal-halide discharge lamp with ceramic discharge vessel, and m Metal-halide discharge lamp with ceramic discharge vessel, and m

1994-10-25

1996-07-02

O'Shea, Sandra L.

Electric lamp and discharge devices

With gas or vapor

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

313622, 313624, 313625, H01J 1704, H01J 1718

Patent

active

055325521

ABSTRACT:
To provide an effective seal for a metal-halide discharge lamp having a ceramic discharge vessel (4), the seal is formed in multiple parts, in which a first part, adjacent the interior or discharge side of the vessel, includes a melt component (14a) which is highly resistant to attack by metal halides within the fill of the lamp. It may contain only 0-12%, by weight, of SiO.sub.2 and has a high melting point, in the order of between 1500.degree.-1700.degree. C. The melt-in region remote from the discharge side is melt-sealed by a vitreous composition (14b), devoid of pores, voids, bubbles, fissures or cracks, to form an effective, vacuum-tight seal, and protected from attack by the metal halides by the mechanically less stable seal in the first zone. The second composition has a much lower melting point, for example in the order of between 1200.degree.-1400.degree. C., and has 20-40% SiO.sub.2. Preferably, and for ease of manufacture, the capillary gap in which the melt seal is formed decreases in dimension towards the discharge side, so that an effective capillary seal can be formed at the higher melting point temperature before the second, lower melting point temperature seal is made.

REFERENCES:
patent: 4122042 (1978-10-01), Meden-Piesslinger et al.
patent: 4501799 (1985-02-01), Driessen et al.
patent: 4530909 (1985-07-01), Makishima
patent: 4940678 (1990-07-01), Aitken
patent: 4980236 (1990-12-01), Oomen et al.
patent: 5099174 (1992-03-01), Coxon et al.
patent: 5446341 (1995-08-01), Hofmann
Patent Abstracts of Japan, vol. 12, No. 395 (E-671) Oct. 1988 & JP-A-63 136 56 (Japan Storage Battery Co., Ltd.) Jun. 1988.

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