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:
Oct. 30, 2007
Filed:
Feb. 12, 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 sealed. The gas discharge tubeincludes 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 a supporting partwhich supports the electric discharge path restricting part and which is electric insulating. The electric discharge path restricting part is provided at its tip portion with a projecting partwhich is cylindrical and projects toward the cathode part side. Letting the outer diameter and height of the projecting partbe 'D' and 'H,' respectively, then D/H is in the range of 0.5 to 2.0. With this structure, it is possible to generate an intense electric field in the vicinity of the tip of the projecting part. This can decrease a startup voltage, thereby ensuring the generation of an electric discharge.