Ceramic metal halide lamp having dysprosium iodide

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United States of America Patent

PATENT NO 9275845
APP PUB NO 20140077694A1
SERIAL NO

14021457

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Abstract

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A ceramic metal-halide lamp is provided that can improve both lamp efficacy and color characteristics, and in which light color shift from the white region can be prevented when the lamp is dimmed. The lamp includes a luminous material, which contains sodium iodide (NaI), cerium iodide (CeI3), thallium iodide (TIl), dysprosium iodide (DyI3) and indium iodide (InI). The amount D[DyI3] of dysprosium iodide DyI3 is selected so as to fall within a range of 0.07 mg/cm3≦D[DyI3]≦1.53 mg/cm3 and a weight ratio R[InI/TIl] of indium iodide InI relative to thallium iodide TIl contained in the luminous material is selected to so as to fall within a range of 0

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Patent Owner(s)

Patent OwnerAddress
IWASAKI ELECTRIC CO LTD1-1-7 HIGASHINIHONBASHI CHUO-KU TOKYO 1030004 ?1030004

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Maehara, Akiyoshi Gyoda, JP 5 7
Matsumoto, Yasuhisa Gyoda, JP 24 91
Sasai, Yasushi Gyoda, JP 9 16

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