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:
Nov. 25, 2003
Filed:
Dec. 04, 2001
Michio Takagaki, Shizuoka, JP;
Masaya Shido, Shizuoka, JP;
Yukihiro Kobayakawa, Shizuoka, JP;
Masayuki Umehara, Shizuoka, JP;
Nobuyuki Kasuya, Shizuoka, JP;
Takeshi Fukuyo, Shizuoka, JP;
Yoshitaka Ohshima, Shizuoka, JP;
Koito Manufacturing Co., Ltd., Tokyo, JP;
Abstract
An arc tube and method for forming an arc tube in which an electrode assembly including a tungsten electrode and a molybdenum foil are joined together in a partially overlapped state and pinch sealed into a pinch seal portion of the arc tube body to suppress leakage due to peeling of the molybdenum foil and prolong the life period of the arc tube. An overlapped length L of a tungsten electrode and a molybdenum foil is set to be 2D≦L ≦0.8W with respect to the diameter D of the tungsten electrode and the width W of the molybdenum foil. In another embodiment, the distance L between the molybdenum foil and a discharge space is set to be B≦L ≦0.8A with respect to the width A and the thickness B of a pinch seal portion.