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US 7,468,585 B2Granted
Metal halide lamp
AssigneePanasonic Corporation
InventorsAtsushi Utsubo, Hiroshi Nohara, Yukiya Kanazawa, Yoshiharu Nishiura, Kiyoshi Takahashi, Makoto Kai, Makoto Horiuchi
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Abstract
A metal halide lamp of the present invention has an arc tube formed of ceramic and a pair of opposing electrodes. This lamp includes a Pr (praseodymium) halide, a Na (sodium) halide, and a Ca (calcium) halide enclosed within the arc tube. 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.
Claims15
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.
2 more elements
Dependencies are inferred from the claim text.