On the Ion Oscillation and its Effects to the Cathode Material in Fluorescent Lamps

• Published in: Journal of the Illuminating Engineering Institute of Japan Vol. 42; no. 9; pp. 422 - 429
• Main Author: Miyata, Toyoo
• Format: Journal Article
• Language: English; Japanese
• Published: The Illuminating Engineering Institute of Japan 1958
• ISSN: 0019-2341; 2185-1506; 1349-838X
• DOI: 10.2150/jieij1917.42.9_422

The luminous fluctuation and the increase of evaporation rate of the oxide cathode material in fluorescent lamps owing to repetition of appearance and extinction of anode ion-oscillation and the others as about 0.5 sec. period have been experimentally studied by the temperature measurement of the coiled electrode, the wave form analysis and the probe characteristics of the discharge tubes, and these temperature characteristics of the bulb wall from-60°to +75°. The extinction of anode oscillation in d.c. operation of the fluorescent lamps may be apt to be brought at the some region of the discharge current and the bulb wall temperature above 20°. The increase of evaporation rate of the oxide cathode material on the electrode operating as anode with non anode oscillation has been more remarkable at d.c. operation than at a.c. burning of fluorescent lamps. The evaporation rate of the electron emitting material on the cathode w ith cathode-ion-oscillation has been nearly equal to it with non cathode oscillation. The wave form and the frequency of the anode oscillation at low wall temperature below about 0° or at the low discharge current with non, red spot on the coiled electrode may be different to them at temperature about 20° or at the discharge current with red spot on the coil. The cathode oscillation may be decreased at about 60°-wall temperature or the heating of the cathode. From these results the anode and cathode construction may be taken into consideration on the anode-and cathode-ion-oscillation.