Patent ID: 6356019
Filing Date: 2002-03-12
Classification: H01J

Abstract:
A fluorescent lamp comprising:a glass tubular body defining a discharge space; first and second electrode assemblies mounted in said discharge space in opposition to each other, each of said electrode assemblies comprising a first electrode and a second electrode; each of said first electrodes comprising a metal lead wire with an electron-emitting material disposed on a free end thereof; and each of said second electrodes comprising a cup-shaped tube coaxially surrounding one of said lead wires and the electron-emitting material disposed on said lead wire, said cup-shaped tube and said electron-emitting material therein forming an annular gap therebetween, and said electron-emitting material being spaced from an open end of said cup-shaped tube, said cup-shaped tube is provided with a length of about 2.0-2.5 times an inside diameter thereof.