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:
May. 12, 2000
Applicant:
Inventors:
Mamoru Takeda, Soraku-gun, JP;
Makoto Horiuchi, Sakurai, JP;
Kiyoshi Takahashi, Neyagawa, JP;
Makoto Kai, Katano, JP;
Takeshi Saito, Amagasaki, JP;
Hideaki Kiryu, Takatsuki, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B 4/116 ;
U.S. Cl.
CPC ...
H05B 4/116 ;
Abstract
A pair of electrodes ( ) are provided in an arc tube ( ) I/S is 20 (A/mm ) or less on a condition that an area of a cross section at a tip of the electrodes ( ) is S (mm ) and an operating current between the electrodes ( ) is I (A). According to this constitution, a long lamp life can be obtained without causing a rise in the lamp voltage and the blackening of the arc tube ( ) by the evaporation of the electrodes while operation time becomes longer.