| 简介 |
PROBLEM TO BE SOLVED : To execute improvement of life as well as prevent degradation of emission light flux through restraint of sputtering of a small electrode and exhaustion of rare gas sealed inside a lamp.
SOLUTION : The low-pressure discharge lamp includes a glass tube with a tube inner diameter within the range of 1 to 5 mm, and a pair of electrodes arranged at either end part in the glass tube. The electrodes contain at least one kind of transition metal selected from IV to VI group transition metal, and mercury, and rare gas containing argon and neon are sealed inside the glass tube, with a relation of a cathode glow discharge density (conversion current density) J of the low-pressure discharge lamp and a sealed rare gas composition index α satisfying : α≤J=I/(S×P2)≤1.5α(provided, S : an effective discharge surface area of the electrode (mm2), I : an actual value lamp current (mA), P : a pressure (kPa) of the sealed rare gas, α : a sealed rare gas composition index).
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