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:
Mar. 22, 2005
Filed:
Nov. 15, 2001
Yoshinobu Ito, Hamamatsu, JP;
Koji Kawai, Hamamatsu, JP;
Tsuyoshi Minamizawa, Hamamatsu, JP;
Hamamatsu Photonics K.K., Shizuoka, JP;
Abstract
In a gas discharge tubeof the present invention, a focusing electrode portionand a discharge limiting portionare electrically insulated, and the discharge limiting portioncomprises a discharge limiting openingwhich opposes an arc ball shaping concave portion. Thus the formation of a discharge path from a cathode portionto the concave portionis ensured and a starting discharge can be reliably generated. Further, by means of the discharge limiting openingwhich opposes the concave portion, an arc ball S can be continuously maintained in an appropriate shape even when a lamp is illuminated, and thus the arc ball S can be shaped with stability, thereby stabilizing the luminance and light quantity.