DUAL TUBE TYPE FLUORESCENT LAMP

摘要

PROBLEM TO BE SOLVED: To provide a dual tube type fluorescent lamp of compact size, excellent in the strength against an external force such as vibration, and capable of generating high-brightness light emission effectively. SOLUTION: A dual tube type fluorescent lamp is composed of an inner tube 1 of glass coated with a phosphor film 4 on the inner wall, encapsulating mercury and a rare gas and furnished at the two ends sealingly with discharge electrodes 6 and 6' connected with leads 5 and 5' inserted air-tightly, an outer tube 1 of transparent glass in which the inner tube 1 is set air-tightly while a gap 7 is reserved relative to the outer surface of the inner tube 1, and a pair of discharge electrodes 9 and 9' connected with leads 8 and 8' inserted sealingly in the gap 7 between the inner 1 and outer tubes 2. The rare gas encapsulated in the gap 7 emits light with electric discharge.