Fluorescent lamp having low cathode fall voltage

Details Fluorescent lamp having low cathode fall voltage Fluorescent lamp having low cathode fall voltage

1991-02-26

1992-04-07

O'Shea, Sandra L.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313573, H01J 6112

Patent

active

051031337

ABSTRACT:
A fluorescent lamp of a hot cathode type which is operated with a lamp current of 50 mA or less comprises an outer tube as an envelop, a gas filled in the envelop and a pair of electrodes disposed at both ends of the outer tube in an opposing fashion, at least one of the electrodes being operated in a hot cathode mode. With the fluorescent lamp of the type described, a following relationship is established, p.d.gtoreq.13, where d represents an inner diameter (cm) of the envelop and p represents an inner pressure (Torr) of the gas filled in the envelop. When the relationship V.sub.k .ltoreq.15, where V.sub.k represents a cathode fall voltage, is further satisfied, the life time of the fluorescent lamp can be elongated.

REFERENCES:
Journal of the Illuminating Engineering Institute of Japan, "The Starting Energy of the Discharge Lamps and the Design Criteria of the Ballasts," vol. 57, No. 9 (1973), Akihiro Inoue, pp. 12-21.
Journal of the Illuminating Engineering Society, "The Glow-to-Thermionic-Arc Transition," vol. 16, No. 2, Summer (1987), John F. Waymouth, pp. 166-180.
Thomas F. Soules et al., "Thermal Model of the Fluorescent Lamp Electrode," Feb. 5, 1988, IES, pp. 1-18, 15 drawing pages.
Waymouth, Electric Discharge Lamps, p. 71, .COPYRGT.1971 by MIT.

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