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:
Apr. 12, 2005
Filed:
Feb. 14, 2003
Makoto Deguchi, Ehime-ken, JP;
Hiromichi Kawashima, Ehime-ken, JP;
Kozo Uemura, Ehime-ken, JP;
Sakae Katayama, Ehime-ken, JP;
Yoshiyuki Watanuki, Kanagawa-ken, JP;
Hiroyuki Kato, Ehime-ken, JP;
Toshihiko Ishigami, Kanagawa-ken, JP;
Mikio Matsuda, Tokyo, JP;
Toshio Hiruta, Kanagawa-ken, JP;
Makoto Deguchi, Ehime-ken, JP;
Hiromichi Kawashima, Ehime-ken, JP;
Kozo Uemura, Ehime-ken, JP;
Sakae Katayama, Ehime-ken, JP;
Yoshiyuki Watanuki, Kanagawa-ken, JP;
Hiroyuki Kato, Ehime-ken, JP;
Toshihiko Ishigami, Kanagawa-ken, JP;
Mikio Matsuda, Tokyo, JP;
Toshio Hiruta, Kanagawa-ken, JP;
Harison Toshiba Lighting Corp., Imabari, JP;
Abstract
To provide, in a special situation of a mercury-free lamp in which a luminance flicker tends to occur unlike a mercury-containing lamp, a metal halide lamp having an electrode structure modified so as to suppress the luminous flicker that is suitably used as an automotive headlamp, and an automotive headlamp apparatus incorporating the same. A metal halide lamp includes: a hermetic vesselwhich is fire resistant and translucent; a pair of electrodessealed in the hermetic vesselwith facing each other at a distant of 5 mm or less, the electrodes each having a shaft parthaving a diameter of 0.25 mm or more and a tip, which originates an arc, having a curved surface having a radius of one-half or less of the diameter of the shaft part; and a discharge medium essentially containing no mercury, sealed in the hermetic vessel, and containing halides of metals including a light-emitting metal in an amount of 0.005 mg/mmof an inner volume of the hermetic vessel or more and a xenon gas at 5 atmospheres or higher at a temperature of 25° C., in which the metal halide lamp is turned on with a lamp power of 60 W or lower in a stable state.