(19)
(11) EP 1 763 067 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
published in accordance with Art. 158(3) EPC

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
24.10.2007 Bulletin 2007/43

(43) Date of publication:
14.03.2007 Bulletin 2007/11

(21) Application number: 05765392.5

(22) Date of filing: 28.06.2005
(51) International Patent Classification (IPC): 
H01J 61/88(2006.01)
 F21S 8/10(2006.01)
(86) International application number:
PCT/JP2005/011845
(87) International publication number:
WO 2006/003894 (12.01.2006 Gazette 2006/02)
(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 MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR LV MK YU

(30) Priority: 30.06.2004 JP 2004193066

(71) Applicants:
  • Harison Toshiba Lighting Corp.
    Imabari-shi, Ehime 794-8510 (JP)
  • TOSHIBA LIGHTING & TECHNOLOGY CORPORATION
    Shinagawa-ku, Tokyo 140-8640 (JP)

(72) Inventors:
  • UEMURA, Kozo, Harison Toshiba Lighting Co.
    Imabari-shi, Ehime 7948510 (JP)
  • NAKAZATO, Keisuke, Harison Toshiba Lighting Co.
    Imabari-shi, Ehime 7948510 (JP)
  • KAWASHIMA, Hiromichi, Harison Toshiba Lighting Co.
    Imabari-shi, Ehime 7948510 (JP)
  • SHIRAKAWA, Osamu, Harison Toshiba Lighting Co.
    Imabari-shi, Ehime 7948510 (JP)
  • DEGUCHI, Makoto, Harison Toshiba Lighting Co.
    Imabari-shi, Ehime 7948510 (JP)
  • WAJATA, Takayuki, Harison Toshiba Lighting Co.
    Imabari-shi, Ehime 7948510 (JP)

(74) Representative: Cheyne, John Robert Alexander M. 
HASELTINE LAKE, Redcliff Quay 120 Redcliff Street
Bristol BS1 6HU
Bristol BS1 6HU (GB)

   


(54) METAL HALIDE LAMP, LIGHTING DEVICE FOR METAL HALIDE LAMP AND HEADLIGHT


(57) There are provided a mercury-free metal halide lamp which is improved in light flux rising immediately after starting, more practical and suitable for a headlight, and a metal halide lamp lighting device and a headlight using this. The metal halide lamp according to the present invention comprises: a translucent air-tight container having an inner volume which is not greater than 0.1 cc, including an enclosure portion forming an inner space having a flat surface on a bottom surface, and having a ratio D/L satisfying the following expression: 0.25 ≤ D/L ≤ 0.43 where D is a distance between the bottom surface and a top surface of the inner space at a central portion in a tube-axis direction, and L is a length of the enclosure portion; a pair of electrodes sealed facing each other with an inter-electrode distance which is not greater than 5 mm; and a discharging medium containing a plurality of metal halogen compounds selected from a group of Sc, Na, In, Zn and a rare-earth metal and a rare gas but intrinsically not containing mercury (Hg), wherein a lamp power per unit inner surface area of the air-tight container is not smaller than 60 (W/cm2).