Circular fluorescent lamp

Details Circular fluorescent lamp Circular fluorescent lamp

1989-08-24

1991-07-23

Yusko, Donald J.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313 1, H01T 6302

Patent

active

050346555

ABSTRACT:
A fluorescent lamp has at least a pair of electrodes, at least two circular discharge tubes connected to said electrodes and enclosing rare gas and mercury therein, and a phosphor coating provided on an inside wall of each of said discharge tubes, the two circular discharge tubes being arranged coaxially circularly on one and the same plane, the diameter of each of the discharge tubes being selected to have a value within a range of from 5 mm to 25 mm both inclusive, the luminance on surface of each of the discharge tubes being selected to have a value within a range of from 2.times.10.sup.4 Cd/m.sup.2 to 6.times.10.sup.4 Cd/m.sup.2.

REFERENCES:
patent: 2043316 (1936-05-01), Johnson
patent: 2309676 (1943-02-01), Schmidling
patent: 2446712 (1948-08-01), McIlvaine
patent: 2501376 (1950-03-01), Breadner et al.
patent: 2743388 (1956-04-01), Bartley
patent: 4833574 (1989-05-01), Gallagher

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