Rare gas arc lamp having hot cathode

Details Rare gas arc lamp having hot cathode Rare gas arc lamp having hot cathode

1988-03-31

1989-11-21

Yusko, Donald J.

Electric lamp and discharge devices

With gas or vapor

With particular gas or vapor

313485, 313488, 313489, 313572, 313576, H01J 1720, H01J 6116

Patent

active

048825204

ABSTRACT:
A rare-gas arc lamp includes a pair of coil filaments disposed at the opposite ends of an elongated bulb for increasing an area of a positive column produced between the coil filament pair in a direction perpendicular to the elongated axis of the bulb, and a rare-gas mainly including xenon gas and having substantially no mercury therein sealed in the bulb at a prescribed pressure selected from the range between 20 Torr and 200 Torr. The combination of the coil filament pair and the xenon gas sealed in the bulb at a prescribed pressure in the range of 20 Torr to 200 Torr may reduce visible changes in a luminance distribution of the lamp when the positive column fluctuates during the operation of the lamp.

REFERENCES:
patent: 2622221 (1952-12-01), Beese
patent: 3275872 (1966-09-01), Chernin et al.
patent: 4298822 (1981-11-01), Fukuda
patent: 4461981 (1984-07-01), Saikatsu et al.
Toshiba Review vol. No. 12, Published Nov. 1985, Author: Yoshiji Yoshiike.

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