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. 05, 2002
Filed:
Mar. 10, 2000
Masato Yoshida, Takatsuki, JP;
Takayuki Murase, Takatsuki, JP;
Matsushita Electric Industrial Co., Ltd., Osaka-fu, JP;
Abstract
A metal halide lamp has a long life since the temperature of the electrodes can be prevented from excessively rising. The metal halide lamp has an arc tube that is composed of a light emitting part and a sealing part at each end of the light emitting part . A pair of electrodes are extended from the ends of the arc tube into the discharge chamber of the light emitting part so that the discharge side ends of the electrodes face each other. The other end of each electrode is connected to a conductor sealed in the sealing part . A part of the electrode , sealed in the sealing part , from the boundary between the light emitting part and the sealing part to the discharge side end of the conductor is referred to as the electrode sealing part L. A metal member partially covers the electrode sealing part L. The ratio of the weight A (mg) of the metal member to the weight B (mg) of the electrode sealing part L is defined as an inequality 0.2≦A/B≦1.6.