Patent ID: 7288880
Filing Date: 2007-10-30
Classification: H01J

Abstract:
1. A gas discharge tube for emitting a predetermined light from a light emitting window of a sealed container with a charged gas toward the outside by producing a discharge between a cathode portion and an anode portion enclosed in said container, said tube comprising: a first discharge path-limit portion, arranged in a midway of a discharge path between said anode portion and said cathode portion, and provided with a first opening for narrowing said discharge path; a second discharge path-limit portion, arranged in a midway of the discharge path between said first discharge path-limit portion and said anode portion, and provided with a second opening for narrowing said discharge path; and a first discharge path-induction portion, arranged between said first discharge path-limit portion and said second discharge path-limit portion, and electrically connected to an external power source.