Mercury-free discharge bulb

Details Mercury-free discharge bulb Mercury-free discharge bulb

2011-07-12

2011-07-12

Patel, Nimeshkumar D (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

With particular gas or vapor

C315S248000

Reexamination Certificate

active

07977886

ABSTRACT:
There is provided a mercury-free discharge bulb for a vehicle. The mercury-free discharge bulb includes an arc tube. The arc tube includes: a light-emitting portion which is formed of a ceramic tube and includes a light-emitting material and a starting xenon gas filled therein, wherein a filling pressure of the starting xenon gas from about 6 atm to about 18 atm; thin tube portions which are formed at respective ends of the light-emitting portion; and electrodes which are fixed inside the thin tube portions and which are provided in the light-emitting portion so as to face each other. The light-emitting material includes at least a sodium halide and a rare-earth metal halide excluding a scandium halide, and a difference between a vapor pressure of the sodium halide and a vapor pressure of the rare-earth metal halide under an environment of about 1000° C. is about 10 kPa or less.

REFERENCES:
patent: 6069456 (2000-05-01), Fromm et al.
patent: 2005/0082987 (2005-04-01), Uemura et al.
patent: 2004-362978 (2004-12-01), None

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