High-pressure discharge lamp, particularly low-rated power disch

Details High-pressure discharge lamp, particularly low-rated power disch High-pressure discharge lamp, particularly low-rated power disch

1995-08-02

1997-05-13

O'Shea, Sandra L.

Electric lamp and discharge devices

With gas or vapor

Having a particular total or partial pressure

313571, 313574, 313632, H01J 1720, H01J 6112, H01J 1704, H01J 6104

Patent

active

056295855

ABSTRACT:
To improve the arc stability of high-pressure discharge lamps, particularly f power ratings of up to about only 250 W, the cathode (4) is formed as an elongated, essentially cylindrical base body (8) having a tapering, conical region (9) terminating in a tip (10). The base body (8), only, is covered with a carbide coating along its length, except for an end portion for electrical connection; the carbide coating starts at the junction or transition between the cylindrical base body portion and the conical end portion. This cathode construction is easier and cheaper to make than prior art cathodes, by coating an essentially cylindrical cathode and then etching or grinding and polishing the tapering end region (9). The electrode is preferably made essentially of tungsten, doped with thorium oxide present up to about 0.6%, optionally also potassium, aluminum and silicon in tiny amounts. The electrode spacing is between 0.4 to 0.8 mm, and when used as a mercury high-pressure discharge lamp, filled with 70 to 130 mg per cubic centimeter mercury; when used as a xenon lamp, the xenon fill is preferably present at a cold fill pressure of between about 2 and 15 bar.

REFERENCES:
patent: 3054014 (1962-09-01), Gemsa
patent: 3706000 (1972-12-01), Retzer et al.
patent: 4724352 (1988-02-01), Schuda et al.
patent: 4906895 (1990-03-01), Pabst
patent: 4988918 (1991-01-01), Mori et al.
patent: 5158709 (1992-10-01), Setti
patent: 5284614 (1994-02-01), Chen et al.
patent: 5422539 (1995-06-01), Chodora

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