| US 7,468,585 B2 | ||
| Metal halide lamp | ||
| Atsushi Utsubo, Toyonaka (Japan); Hiroshi Nohara, Nishinomiya (Japan); Yukiya Kanazawa, Osaka (Japan); Yoshiharu Nishiura, Otsu (Japan); Kiyoshi Takahashi, Kyotanabe (Japan); Makoto Kai, Katano (Japan); and Makoto Horiuchi, Sakurai (Japan) | ||
| Assigned to Panasonic Corporation, Kadoma (Japan) | ||
| Appl. No. 10/547,060 PCT Filed Jul. 22, 2004, PCT No. PCT/JP2004/010789 § 371(c)(1), (2), (4) Date Aug. 26, 2005, PCT Pub. No. WO2005/010921, PCT Pub. Date Feb. 03, 2005. |
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| Claims priority of application No. 2003-279803 (JP), filed on Jul. 25, 2003. | ||
| Prior Publication US 2006/0170363 A1, Aug. 03, 2006 | ||
| Int. Cl. H01J 17/20 (2006.01); H01J 61/18 (2006.01); H01J 61/20 (2006.01) | ||
| U.S. Cl. 313—638 [313/637; 313/640; 313/641; 313/642; 313/643] | 15 Claims |
| 1. A metal halide lamp having an arc tube formed of ceramic and a pair of opposing electrodes, comprising:
a Pr (praseodymium) halide, a Na (sodium) halide, and a Ca (calcium) halide enclosed within the arc tube, wherein
the Pr halide content Hp [mol], the Na halide content Hn [mol], and the Ca halide content Hc [mol] satisfy the relationships
of:
0.4≤Hc/Hp≤15.0; and
3.0≤Hn/Hp≤25.0.
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