Patent ID: 7271542
Filing Date: 2007-09-18
Classification: H01J

Abstract:
1. A gas discharge tube comprising: a sealed container in which gas is contained; an anode part disposed in said sealed container; a cathode part defining an electric discharge part for generating an electric discharge with said anode part, said cathode part being disposed inside said sealed container in such a manner as to be distanced from said anode part; an electric discharge path restricting part being cylindrical and conductive and having a throughhole for narrowing said electric discharge path, said electric discharge path restricting part being disposed between said anode part and said cathode part, and being adapted to be electrically connected with an external power source; and an electric discharge shielding part disposed to enclose said electric discharge path restricting part, said electric discharge shielding part being electrically isolated from said electric discharge path restricting part, wherein said electric discharge path restricting part and said electric discharge shielding part are positioned in such a manner that an end part of said electric discharge path restricting part on said cathode part side projects beyond a surface of said electric discharge shielding part on said cathode part side by a predetermined amount of projection.