Ceramic metal halide lamp with length to diameter ratio
High color rendition (Ra≧80) and high efficiency (η≧100 (1 m/W)) which are effects conflicting to each other in a metal halide lamp are attained. An arc tube formed of translucent ceramics, capillaries are formed continuously on the both ends of an arc chamber formed substantially in an ellipsoidal...
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Format | Patent |
Language | English |
Published |
08.01.2013
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Abstract | High color rendition (Ra≧80) and high efficiency (η≧100 (1 m/W)) which are effects conflicting to each other in a metal halide lamp are attained. An arc tube formed of translucent ceramics, capillaries are formed continuously on the both ends of an arc chamber formed substantially in an ellipsoidal shape in the direction of the longitudinal axis by way of a transition curve with no angled corner, and the arc tube is designed to effective length L/effective inner diameter D of 1.8 to 2.2, and formed to such a size that the lowest temperature of the arc chamber is 800° C. or higher and the highest temperature of the arc chamber is 1200° C. or lower during lighting, and at least thulium iodide, thallium iodide, sodium iodide, and calcium iodide are sealed as metal halides where sodium iodide and calcium iodide are sealed by a molar ratio of 40 to 80% and less than 30%, respectively, based on the entire metal halides. |
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AbstractList | High color rendition (Ra≧80) and high efficiency (η≧100 (1 m/W)) which are effects conflicting to each other in a metal halide lamp are attained. An arc tube formed of translucent ceramics, capillaries are formed continuously on the both ends of an arc chamber formed substantially in an ellipsoidal shape in the direction of the longitudinal axis by way of a transition curve with no angled corner, and the arc tube is designed to effective length L/effective inner diameter D of 1.8 to 2.2, and formed to such a size that the lowest temperature of the arc chamber is 800° C. or higher and the highest temperature of the arc chamber is 1200° C. or lower during lighting, and at least thulium iodide, thallium iodide, sodium iodide, and calcium iodide are sealed as metal halides where sodium iodide and calcium iodide are sealed by a molar ratio of 40 to 80% and less than 30%, respectively, based on the entire metal halides. |
Author | Maehara, Akiyoshi Aoki, Shigeyuki Hamano, Motonori |
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References | Selezneva et al. (2009/0224674) 20090900 Honda et al. (2002/0135304) 20020900 (2005/096347) 20051000 Lehmann (2006/0273726) 20061200 (2002-245971) 20020800 Honda et al. (6215254) 20010400 Kakisaka et al. (2003/0025453) 20030200 Higashi et al. (2008/0224615) 20080900 Honda et al. (6661176) 20031200 Jungst et al. (2006/0208643) 20060900 Yoshioka et al. (2007/0243415) 20071000 Koerber et al. (2006/0091812) 20060500 (2008-44344) 20080200 Dakin et al. (2007/0085478) 20070400 Ohashi et al. (2009/0029087) 20090100 (2000-58002) 20000200 (2003-86131) 20030300 (5-82099) 19930400 Rintamaki et al. (2006/0164016) 20060700 |
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Snippet | High color rendition (Ra≧80) and high efficiency (η≧100 (1 m/W)) which are effects conflicting to each other in a metal halide lamp are attained. An arc tube... |
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Title | Ceramic metal halide lamp with length to diameter ratio |
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