Gas discharge tube

摘要

A gas discharge tube comprises an envelope (11) for sealing a gas, lead pins (13-16) and a light-emitting assembly (20). The light-emitting assembly includes: a focusing electrode support member (21) of a conductive material; a hot cathode (31) for emitting thermoelectrons; an anode (24) for receiving thermoelectrons; a focusing electrode (29) for converging paths of thermoelectrons; a first spacer (50a) of an insulator being arranged between the focusing electrode support member and the anode; a second spacer (50b) of an insulator being arranged at an opposite side to the first spacer through the anode; and an anode support member (22) of a conductive material for pushing the anode onto the focusing electrode support member through the first and second spacers. A gas discharge tube having a long service life and capable of improving the operational stability during long-time continuous light emission can be provided.