| 摘要 |
PROBLEM TO BE SOLVED: To realize high performance, long service life and low cost by constituting a discharge electrode by nipping a thin plate formed from a first metal material by covering layers formed from a second metal material when a discharge chamber is composed by bonding a front board to a rear box body via frit glass, a discharge gas is enclosed and a pair of discharge electrodes are arranged in the discharge chamber, a phosphor is applied to the upper and lower surfaces in the discharge chamber, ends of the discharge electrodes are extracted outside the discharge chamber which passes through the bonding material. SOLUTION: A part arranged in a discharge chamber of discharge electrodes in this fluorescent lamp has a structure where a thin plate 51 formed from a first metal material is nipped by covering layers 52 formed from a second metal material. In this case, the first metal material has a thermal expansion rate closer to a frit glass than the second metal material, and the second metal material is easy to emit secondary electrons, or has a low sputtering rate, or is easy to emit secondary electrons and has a low sputtering rate as compared with the first metal material.
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