Electric lamp and discharge devices – With gas or vapor – Having electrodes with geometrical relationship
Reexamination Certificate
2011-01-18
2011-01-18
Ton, Toan (Department: 2889)
Electric lamp and discharge devices
With gas or vapor
Having electrodes with geometrical relationship
C313S567000
Reexamination Certificate
active
07872420
ABSTRACT:
In a metal halide lamp having a rated lamp wattage of greater than or equal to 450 W, which includes: a translucent ceramic arc tube enclosure including: a main tube inside which a discharge space is formed; and two narrow tubes having smaller diameter than the main tube, each connected to either end of the main tube; two electrodes; and a metal halide provided inside the arc tube enclosure, in which one of the two electrodes is disposed so that it protrudes inside the main tube from inside of one of the two narrow tubes, and the other one of the two electrodes is disposed so that it protrudes inside the main tube from the other one of the two narrow tubes, and when the rated lamp wattage is denoted by W (watt), an inside diameter of the main tube by D (mm), an electrode protruding length which is the distance from boundary between the main tube and the narrow tubes to an end of the electrode by L (mm), and the distance between ends of the two electrodes by E (mm), a bulb wall loading G (watt/cm2) represented by G=W/(3.14×D×E×0.01) falls within the range of 15≦G≦40, and a relationship 0.32≦L/D≦0.0003×W+0.465 is established.
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International Search Report of PCT/JP2006/302826, date of mailing Apr. 4, 2006.
Kawasaki Kazuhiko
Nakano Kuniaki
Taniguchi Shinji
GS Yuasa International Ltd.
Hanley Britt D
Ton Toan
Westerman Hattori Daniels & Adrian LLP
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