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:
Feb. 21, 2006
Filed:
Oct. 31, 2003
Masataka Kawaguchi, Hyogo-ken, JP;
Motoko Uramoto, Hyogo-ken, JP;
Dan Masashi, Hyogo-ken, JP;
Yoshihiro Horikawa, Hyogo-ken, JP;
Masataka Kawaguchi, Hyogo-ken, JP;
Motoko Uramoto, Hyogo-ken, JP;
Dan Masashi, Hyogo-ken, JP;
Yoshihiro Horikawa, Hyogo-ken, JP;
Ushiodenki Kabushiki Kaisha, Tokyo, JP;
Abstract
A discharge lamp which maintains a high lumen maintenance factor even when operated for a long time is obtained in a discharge lamp which has a silica glass discharge vessel and a pair of opposed electrodes in the discharge vessel and in which the discharge vessel is filled with at least 0.15 mg/mmmercury, a rare gas with argon as the main component, and 2×10μmole/mmto 7×10μmole/mmbromine by meeting the following conditions when feeding a direct current of 5 mA between the electrodes and a glow discharge produced:1.0×10≦1.2×10  Condition (1)≦1.4×10  Condition (2)≦1.2×10  Condition (3)≦1.4×10  Condition (4)where a is the emission intensity of the argon with a wavelength of 668 nm, b is the emission intensity of OH with a wavelength of 309 nm, c is the emission intensity of hydrogen (H) with a wavelength of 656 nm, d is the emission intensity of Cwith a wavelength of 517 nm, and e is the emission intensity of CH with a wavelength of 431 nm.