Discharge bulb

Details Discharge bulb Discharge bulb

2008-01-29

2010-06-29

Patel, Vip (Department: 2889)

Electric lamp and discharge devices

With gas or vapor

Electrode composition

C313S491000

Reexamination Certificate

active

07746000

ABSTRACT:
A discharge bulb is provided. The discharge bulb includes an arc tube, a glass shroud cylindrically surrounding the arc tube, and an insulated plug fixedly supporting an end portion of the glass shroud. The arc tube includes a light generating portion having a discharge space therein, a first pinch seal portion and a second pinch seal portion disposed on respective sides of the light generating portion, a first electrode rod protruding into the discharge space from the first pinch seal portion, and a second electrode rod protruding into the discharge space from the second pinch seal portion so as to be opposed to the first electrode rod. The discharge space contains a rare gas and a metal halide, but does not contain mercury. The first electrode is made of thoriated tungsten, and the second electrode rod is made of pure tungsten.

REFERENCES:
patent: 2965790 (1960-12-01), Ittig et al.
patent: 4672267 (1987-06-01), Lapatovich et al.
patent: 4992703 (1991-02-01), Ramaiah
patent: 2005-183165 (2005-07-01), None

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