Mercury-free high-pressure discharge lamp and luminaire using the same

(19)

(11)

EP 1 768 165 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	26.11.2008 Bulletin 2008/48

(43)	Date of publication A2:
	28.03.2007 Bulletin 2007/13

(21)	Application number: 06019906.4

(22)	Date of filing: 22.09.2006

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International Patent Classification (IPC):

H01J 61/12^(2006.01)

H01J 61/82^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
	Designated Extension States:
	AL BA HR MK RS

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Priority:

22.09.2005 JP 2005276883
31.05.2006 JP 2006150886

(71)	Applicant: TOSHIBA LIGHTING & TECHNOLOGY CORPORATION
	Shinagawa-ku, Tokyo (JP)

(72)	Inventors:
	Kashiwagi, Takahito Shinagawa-ku Tokyo (JP) Ishida, Masazumi Shinagawa-ku Tokyo (JP) Matsuda, Mikio Shinagawa-ku Tokyo (JP) Uemura, Kozo Shinagawa-ku Tokyo (JP)

(74)	Representative: Kramer - Barske - Schmidtchen
	European Patent Attorneys Landsberger Strasse 300 80687 München 80687 München (DE)

(54)	Mercury-free high-pressure discharge lamp and luminaire using the same

(57) A mercury-free high-pressure discharge lamp includes a light-transmissive airtight envelope enclosing therein a discharge space, a pair of electrodes sealed inside the light-transmissive airtight envelope and facing the discharge space, and an ionization medium substantially excluded mercury therefrom, which is filled in the light-transmissive airtight envelope, wherein the ionization medium contains, a principal metal halide including thulium (Tm) as primary constituent thereof and capable of emitting light mainly at a visible range, an accessory metal halide including zinc (Zn) as primary constituent thereof and capable of fixing lamp voltage, and rare gas.

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