GAS DISCHARGE TUBE

摘要

A gas discharge tube (1), wherein a gas is sealed in a sealed case (2) at least a part of which is light transmissible, to generate electric discharge between an anode (6) and a cathode (9) provided in the sealed case (2), whereby predetermined light is discharged from a light transmission portion (14a) of the sealed case (2) to the outside, comprising the anode (6) placed on an insulating anode support member (5), a converging electrode support member (7) placed on a surface, which surrounds the anode (6), of the anode support member and having an opening (7a) at which the anode (6) is exposed, a converging electrode (8) which has a converging opening (8a) at a front surface of the opening (7a) so that the opening (8a) projects toward the anode (6), and which is placed on the support member (7), and a cathode (9) placed on the anode support member (5) or converging electrode support member (7) so as to be spaced from the converging opening (8a).