Patent ID: 8089212
Filing Date: 2012-01-03
Classification: H01J

Abstract:
1. An electrode assembly for a discharge lamp comprising: a first portion having a first coefficient of thermal expansion (CTE) and that is subject to attack by a dose of the lamp; a second portion having first and second ends formed of a material different than the first portion, the second portion having a second CTE different than the first CTE and the second portion being more resistant to attack by the dose than the first portion; an electrode connected to the second end of the section portion; and a helical overwind received over the second portion, wherein adjacent turns of the overwind are spaced apart to form a gap that facilitates receipt of associated seal material in reaching an interstitial space between the overwind and second portion, wherein the helical overwind gap measured between adjacent turns of the overwind is approximately 10% to 50% of a diameter of the overwind.