METAL HALIDE LAMP AND LIGHTING DEVICE USING THE SAME

PROBLEM TO BE SOLVED: To provide a metal halide lamp free from crack at lighting with a Ce halide and a Ca halide sealed in an arc tube formed of ceramics, as well as a lighting device using the same. SOLUTION: In the metal halide lamp provided with the arc tube 20 formed of translucent ceramics, a...

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Main Authors NOHARA KOJI, KAI MAKOTO, TAKAHASHI KIYOSHI, UCHIHO ATSUSHI, KANAZAWA YUKIYA, HORIUCHI MAKOTO, NISHIURA YOSHIHARU
Format Patent
LanguageEnglish
Published 26.05.2005
Edition7
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
ELECTRICITY
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Summary:PROBLEM TO BE SOLVED: To provide a metal halide lamp free from crack at lighting with a Ce halide and a Ca halide sealed in an arc tube formed of ceramics, as well as a lighting device using the same. SOLUTION: In the metal halide lamp provided with the arc tube 20 formed of translucent ceramics, a pair of opposed electrodes, and the halide sealed in the arc tube 20, L/D is to be not more than 1, when an inner diameter of the arc tube 20 is D (mm) and an inter-tip distance of the electrodes is L (mm), and Hca/Hceis to be not more than 0.4 and 15 or less, when a sealed volume of the Ca halide is Hca(mol), and that of the Ce halide is Hce(mol), whereby, a crack can be restrained, and a lamp efficiency can be improved. COPYRIGHT: (C)2005,JPO&NCIPI
Bibliography:Application Number: JP20030367098