Cold-cathode fluorescent lamp

Details Cold-cathode fluorescent lamp Cold-cathode fluorescent lamp

2005-09-13

2005-09-13

Glick, Edward J. (Department: 2882)

Electric lamp and discharge devices

With gas or vapor

Having hollow cathode

C313S620000, C313S631000, C313S574000, C313S485000

Reexamination Certificate

active

06943499

ABSTRACT:
The present invention has an object to provide a cold-cathode fluorescent lamp which can suppress sputtering caused by electric discharge and reduce consumption of mercury so as to achieve a longer lifetime even if a lamp current is large and a lighting tube has a small diameter. The cold-cathode fluorescent lamp according to the present invention is characterized in that a distance between the inner surface of the lighting tube and the outer surface of a cylindrical electrode is set such that electric discharge develops mainly on the inner surface of the cylindrical electrode. When the lighting tube has an inside diameter D1of 1 to 6 mm and the maximum lamp current is 5 mA or more, an outside diameter D2of the cylinder electrode is preferably set at D1−0.4 [mm]≦D2<D1.

REFERENCES:
patent: 3772559 (1973-11-01), Schoke
patent: 5962977 (1999-10-01), Matsumoto et al.
patent: 01151148 (1989-06-01), None
patent: 4-337239 (1992-11-01), None
patent: 4-337240 (1992-11-01), None
patent: 10-199476 (1998-07-01), None
patent: 11-111217 (1999-04-01), None
patent: 2000-133201 (2000-05-01), None

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