DISCHARGE TUBE

摘要

A discharge tube which has a stabilized discharge voltage characteristic irrespective of a change of the frequency of discharge. The discharge tube comprises a hollow tubular casing, and cathode and anode electrodes secured to the axial opposite ends of the tubular casing to define an enclosed hollow spacing in which inert gas is filled such that a discharge can be started by application of a pulse voltage between the electrodes. Each of the electrodes includes an electrode base secured to the tubular casing and an electrode member securely mounted on the electrode base in the hollow spacing. The electrode member at least of the cathode electrode is composed of a layered metal body including a ground layer and a thin surface layer formed on one or each of the opposite faces of the ground layer and having a considerably smaller thickness of 5 to 20 .mu.m than the ground layer.