Electrode for miniature high pressure metal halide lamp

Details Electrode for miniature high pressure metal halide lamp Electrode for miniature high pressure metal halide lamp

1978-09-11

1982-07-20

Segal, Robert

Electric lamp and discharge devices

With support and/or spacing structure for electrode and/or...

For plural electrodes of discharge device

313213, H01J 1706, H01J 61073

Patent

active

043408362

ABSTRACT:
An electrode for a miniature high pressure metal halide lamp having a volume not exceeding 1 cc and a discharge current not exceeding 1 ampere comprises a slender tungsten shank with a few secondary turns of mandrel-less coiled-coil overwind thereon and preferably a balled distal end. The shank diameter is chosen in the range of 5 to 15 mils and above the size where melt-back starts at the intended lamp current, and the overwind is made of primary wire not exceeding 3 mils originally wound on a primary mandrel of 3 to 7 mils subsequently removed. This assures a rapid glow-to-arc transition which provides good maintenance and also reduces ballast requirements.

REFERENCES:
patent: 2218345 (1940-10-01), Spaeth
patent: 2241362 (1941-05-01), Gustin et al.
patent: 3003077 (1961-10-01), Thomas
patent: 3588579 (1971-06-01), Michael
patent: 3937996 (1976-02-01), Cap
patent: 4105908 (1978-08-01), Harding et al.
patent: 4136298 (1979-01-01), Hansler
patent: 4161672 (1979-07-01), Cap et al.

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