Patent ID: 6809468
Filing Date: 2004-10-26
Classification: H01J

Abstract:
A gas discharge lamp comprising:an envelope having a first diameter; a filament placed within said envelope; a cup shaped shield having a second diameter and a bottom round hole placed around said filament; a cover having a hole with a third diameter covering said cup shaped shield opposite the bottom hole; and wherein the third diameter of the hole in said cover has a predetermined size forming a first proportion relative to the second diameter of said cup shaped shield and a second proportion relative to the first diameter of said envelope so that a cross section area of an arc is reduced increasing ion and current density, and wherein the first proportion of the second diameter to the third diameter is between 2.0 and 3.0; and the second proportion of the first diameter to the third diameter is between 3.5 and 4.5, whereby current load is improved without changing discharge characteristics.