The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 18, 2007
Filed:
Feb. 19, 2004
Yoshinobu Ito, Hamamatsu, JP;
Masaki Ito, Hamamatsu, JP;
Koji Matsushita, Hamamatsu, JP;
Hamamatsu Photonics K.K., Shizuoka, JP;
Abstract
A gas discharge tubeof the present invention generates an electric discharge between an anode partand a cathode partdisposed inside a sealed containerin which gas has been contained. The gas discharge tubecomprises an electric discharge path restricting partwhich is cylindrical and disposed between the anode part and the cathode part, and which has a throughholefor narrowing an electric discharge path between the anode part and the cathode part; and an electric discharge shielding partwhich is disposed to surround the electric discharge path restricting part so as to restrict an electric discharge from the outer peripheral surface of the electric discharge path restricting part to the cathode part, and which is electrically isolated from the electric discharge path restricting part. The end part of the electric discharge path restricting part on the cathode part side projects beyond a surface of the electric discharge shielding part on the cathode side by a predetermined amount 'P' of projection. With this structure, a high density electron region is formed exclusively in a part of the throughhole of the electric discharge path restricting part on the cathode side, thereby ensuring the generation of a startup discharge.