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. 19, 2002
Filed:
Jan. 12, 2001
Shigefumi Oda, Osaka, JP;
Hiroshi Nohara, Hyogo, JP;
Yoshiharu Nishiura, Shiga, JP;
Shiki Nakayama, Osaka, JP;
Takashi Yamamoto, Osaka, JP;
Masanori Higashi, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A discharge tube ( ) made of transparent ceramics includes a main tube ( ) and slender tubes provided on both sides thereof. In one of the slender tubes, a main electrode lead-in member that is connected to a main electrode ( ) is inserted and sealed. In the other two-hole slender tube, a main electrode lead-in member that is connected to a main electrode ( ) and an auxiliary electrode lead-in member that is connected to an auxiliary electrode ( ) are inserted and sealed so as to be isolated electrically from each other. With such a structure, it is possible to achieve highly efficient and stable lifetime characteristics and suppress changes in characteristics during lifetime caused by leaks during an operation and reaction between a sealing material and an enclosed material inside the discharge tube. In addition, it is possible to obtain a high-pressure metal vapor discharge lamp that has stable lamp starting characteristics and allows a free design of the discharge tube.