Patent ID: 6462471
Filing Date: 2002-10-08
Classification: H01J

Abstract:
High pressure mercury lamp comprising a silica glass discharge vessel containing a pair of opposed, spaced apart, electrodes, a rare gas and mercury in an amount of at least equal to 0.16 mg/mm3, a wall load on the vessel being at least equal to 0.8 W/mm2; wherein a side tube part is formed on each end of the discharge vessel; and wherein a sealing body is provided that is formed of a functional gradient material, the sealing body having a inner end area formed of dielectric material and an outer end area formed of electrically conductive material, the dielectric inner end area being connected to the side tube and the conductive outer end area of the sealing body being connected to an outer lead; and wherein the functional gradient material has a ratio of dielectric material to electrically conductive material which changes in a lengthwise direction of the sealing body from the dielectric inner end area to the conductive outer end area.