High-pressure discharge lamp with corrosion protected electrode

Details High-pressure discharge lamp with corrosion protected electrode High-pressure discharge lamp with corrosion protected electrode

1989-04-14

1991-03-19

Yusko, Donald J.

Electric lamp and discharge devices

With gas or vapor

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

313 25, 313641, H01J 1718

Patent

active

050013955

ABSTRACT:
To protect tungsten electrode shafts (2, 3; 15, 16) extending into the a rtz glass discharge chamber (13, 27) of a high-pressure discharge lamp from attack by metal halides included in the fill to improve the color rendition of the discharge, the electrode shafts (2, 3; 15, 16) are tightly surronded by small tubes (11, 12; 25, 26) of electrically insulating material, which is highly temperature resistant, located in part within the press seal (10; 23, 24) and fitted against the ends of sealing foils (6, 7; 19, 20) which face the discharge chamber. The tube elements extend at least about 0.5 mm beyond the inner ends of the press seal (10; 23, 24) into the discharge chamber (13, 27) and are formed of a material which has a thermal coefficient of expansion which is not lower than that of quartz glass and not higher than that of tungsten.

REFERENCES:
patent: 4633136 (1986-12-01), Fromm et al.
patent: 4647814 (1987-03-01), Dobrusskin et al.
patent: 4691142 (1987-09-01), Dohmen
patent: 4717852 (1988-01-01), Dobrusskin et al.
patent: 4783612 (1988-11-01), Sprengers

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