Metal halide lamp that has desired color characteristic and...

Details Metal halide lamp that has desired color characteristic and... Metal halide lamp that has desired color characteristic and...

2005-08-05

2008-09-09

Ton, Toan (Department: 2889)

Electric lamp and discharge devices

With gas or vapor

With particular gas or vapor

Reexamination Certificate

active

07423380

ABSTRACT:
Provided is a metal halide lamp capable of being dimmed, which is prevented from non-lighting due to leakage of an arc tube attributable to a crack occurring at thin tubes, as well as realizing a desired color characteristic. The metal halide lamp has an arc tube that includes an envelope made of translucent ceramic, a pair of electrodes, and metal halides, the metal halides including rare earth metal halide, sodium halide, and magnesium halide, the rare earth metal halide being at least one of dysprosium halide, thulium halide, holmium halide, cerium halide, and praseodymium halide, and the magnesium halide being at least one of magnesium iodide and magnesium bromide, where when a maximum lamp power P (W) is in a range of 70 W to 250 W, the following relations are satisfied:in-line-formulae description="In-line Formulae" end="lead"?0.0345A+0.0028B<0.0015P+0.0475;in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?A≧0.021P+0.313; andin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?B≧10.0,in-line-formulae description="In-line Formulae" end="tail"?where A (mg) represents a total content of the metal halides, and B (mol %) represents a content ratio of the magnesium halide to the metal halides.

REFERENCES:
patent: 6501220 (2002-12-01), Lambrechts et al.
patent: 6717364 (2004-04-01), Zhu et al.
patent: 2006/0108930 (2006-05-01), Brock et al.
patent: 1180786 (2002-02-01), None
patent: 2002-042728 (2002-08-01), None

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