Mercury-free arc tube for a discharge lamp

Details Mercury-free arc tube for a discharge lamp Mercury-free arc tube for a discharge lamp

2007-01-30

2007-01-30

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Having particular electrode structure

C313S331000, C313S332000, C313S634000

Reexamination Certificate

active

11012296

ABSTRACT:
A mercury-free arc tube for a discharge lamp has a closed chamber filled with rare gas and a metal halide containing at least Na halide or Sc halide and electrodes disposed on both end portions of the closed chamber so as to be opposed to each other, wherein the electrode rod is stepped shape which satisfies relationship of 1.1<A1/A2<7.3, whereas A1is a cross sectional area of the electrode in a top-end side area protruded into the closed chamber and A2is a cross sectional area of the electrode in a base-end side area fixed to the end portion of the closed chamber.

REFERENCES:
patent: 5552670 (1996-09-01), Heider et al.
patent: 2001-15067 (2001-01-01), None

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