Circular fluorescent lamp

Electric lamp and discharge devices – With luminescent solid or liquid material – With gaseous discharge medium

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Details

313 1, H01T 6302

Patent

active

057239398

ABSTRACT:
This invention provides a compact, efficient and well-designed circular fluorescent lamp with high output power. The circular fluorescent lamp has less non-luminant region and good characteristics of luminous intensity distribution, and keeps high level of lamp lumen output. Circular arc tubes are disposed concentrically on the same plane. Electrodes are attached to the tube-end parts of the one side of the circular arc tubes respectively, and the other tube-end parts of non-electrode side are sealed. The circular arc tubes are joined each other near the tube-end parts of the non-electrode side with a bridge-jointed portion, so that a discharge path is formed between the electrodes inside the arc tubes. The tube outer diameter of the circular arc tubes is 14 mm, the circle outer diameter of the outer circular arc tube is 150 mm, and the circle inner diameter of the inner arc tube is 90 mm. The distance measured along the center line of the tube from the point corresponding radially to the end part of the bridge-jointed portion to the sealed tube-end part of the outer circular arc tube is 11 mm, and the distance measured along the center line of the tube from the point corresponding radially to the end part of the bridge-jointed portion to the sealed tube-end part of the inner circular arc tube is 6 mm.

REFERENCES:
patent: 2309676 (1943-02-01), Schmidling
patent: 4121132 (1978-10-01), Repsher
patent: 4833574 (1989-05-01), Gallagher
patent: 5034655 (1991-07-01), Mirayama et al.
patent: 5105118 (1992-04-01), Shinada et al.

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