US 5,034,655 A · Circular fluorescent lamp

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.

Claims21

Dependent claims

A fluorescent lamp, comprising:

first and second circular discharge tubes of different radius, each discharge tube being arranged to enclose a rare gas and mercury, said first and second discharge tubes further being arranged coaxially and circularly in the same radial plane;
a phosphor coating provided on an inside wall of each said discharge tube;
and
an electrode provided at one end of each said first and second discharge tube, the other ends of each said first and second discharge tube being radially connected by a hollow bridge so that said hollow bridge connects the discharge paths of each said first and second tube to create a single discharge path.

1 more element

Dependencies are inferred from the claim text.

Circular fluorescent lamp

Life of this patent

Circular fluorescent lamp

Life of this patent

Abstract

Claims21