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:
Aug. 04, 2009
Filed:
Apr. 30, 2003
Yoshinobu Ito, Hamamatsu, JP;
Koji Matsushita, Hamamatsu, JP;
Masaki Ito, Hamamatsu, JP;
Hamamatsu Photonics K.K., Hamamatsu-shi, Shizuoka, JP;
Abstract
In a gas discharge tube there is carried out narrowing of the discharge path with cooperation of the first openingand second openingin order to obtain higher luminance of light. Further, in order to maintain excellent starting-properties of a lamp even if the discharge path is narrowed, a predetermined voltage is applied to a second discharge path limit portionexternally. Thereby, a positive or active starting discharge is produced in such a manner as to pass through the first opening. Further, the second openingis comprised of not only a straight sectionextending in a direction of an optical axis Y, but also a spread sectionextending from an end portion of the straight sectiontoward the first opening.