CAR HEADLIGHT-USE METAL HALIDE LAMP

WIPO Patent Application WO/2002/082500

A1

A metal halide lamp provided with an arc tube provided at the opposite ends thereof with a pair of tungsten electrodes, and having sealed therein a metal halide as the main component of a luminescent material and xenon as a buffer gas, wherein an added sodium oxide amount in a tungsten electrode is up to 0.4 mass%, the metal halide contains scandium iodide, and a xenon sealing pressure is at least 0.4 Mpa, whereby a long-life car headlight-use metal halide lamp is provided that can improve life characteristics such as a lamp lumen maintenance factor at at least 2000 hours of lighting time.

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Yoshida, Masato (2-12-2-405, Kamihamuro Takatsuki-shi, Osaka, 569-1044, JP)
Kiryu, Hideaki (3-1-25-201, Kotobuki-cho Takatsuki-shi, Osaka, 569-0826, JP)

PCT/JP2002/002952

October 17, 2002

March 27, 2002

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MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (1006-banchi, Oaza-Kadoma Kadoma-shi, Osaka, 571-8501, JP)
Yoshida, Masato (2-12-2-405, Kamihamuro Takatsuki-shi, Osaka, 569-1044, JP)
Kiryu, Hideaki (3-1-25-201, Kotobuki-cho Takatsuki-shi, Osaka, 569-0826, JP)

H01J17/04; H01J17/16; H01J61/04; H01J61/073; H01J61/12; H01J61/30; H01J61/36; H01J61/82; H01J17/02; H01J17/04; H01J61/00; H01J61/04; H01J61/06; H01J61/12; H01J61/30; H01J61/36; (IPC1-7): H01J61/073

IKEUCHI SATO & PARTNER PATENT ATTORNEYS (26th Floor, OAP TOWER 8-30, Tenmabashi 1-chom, Kita-ku Osaka-shi Osaka, 530-6026, JP)

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