Title:
メタルハライドランプおよび自動車用前照灯装置
Document Type and Number:
Japanese Patent JP4037142
Kind Code:
B2
Abstract:
To improve the ratio between first and second halides sealed in a mercury-free lamp, thereby providing a metal halide lamp which has a high luminous efficiency and a low lamp voltage reduction and emits light of an appropriate color and an automotive headlamp apparatus incorporating the same, a metal halide lamp includes a hermetic vessel (1) which is fire resistant and translucent; a pair of electrodes (3,3) sealed in the hermetic vessel (1) facing each other at a distant of 5 mm or less; and a discharge medium substantially containing no mercury, sealed in the hermetic vessel (1), and containing first halides mainly including scandium halide and sodium halide, a second halide for mainly providing a lamp voltage and xenon gas at 0.5 MPa or more at a temperature of 25°C, the amounts of scandium halide and sodium halide sealed in the hermetic vessel (1) satisfying the formula 0.25 < a/(a+b) <0.8, where reference character a denotes the mass of scandium halide and reference character b denotes the mass of sodium halide, while, in a stable state, the metal halide lamp is turned on with a lamp power of 60 W or lower.
Inventors:
Uemura Kozo
Nobuhiro Tamura
Kawashima Junko
Hiromichi Kawashima
Hiroyuki Kato
Makoto Exit
Nobuhiro Tamura
Kawashima Junko
Hiromichi Kawashima
Hiroyuki Kato
Makoto Exit
Application Number:
JP2002089735A
Publication Date:
January 23, 2008
Filing Date:
March 27, 2002
Export Citation:
Assignee:
Toshiba Lighting & Technology Corporation
Harrison Toshiba Lighting Corp.
Harrison Toshiba Lighting Corp.
International Classes:
F21S8/10; H01J61/20; H01J17/20; H01J61/04; H01J61/12; H01J61/18; H01J61/34; H01J61/35; H01J61/54; H01J61/86; H01J61/88; F21W101/10; F21Y101/00
Domestic Patent References:
| JP2001313001A | ||||
| JP2000243348A | ||||
| JP2001006610A | ||||
| JP2001273870A |
Attorney, Agent or Firm:
Yoshihiro Onoda