Patent ID: 9030100
Filing Date: 2015-05-12
Classification: H01J

Abstract:
1. A cathode component for a discharge lamp, the cathode component comprising: a barrel having a wire diameter of 2 to 35 mm; and a tapered front end, wherein the cathode component comprises a tungsten alloy containing 0.5 to 3% by weight, in terms of oxide (ThO not less than 90% of tungsten crystals are accounted for by tungsten crystals having a grain size in the range of 1 to 80 μm, as observed in terms of an area ratio of 300 μm×300 μm in unit area in a circumferential cross section of the barrel, and not less than 90% of tungsten crystals are accounted for by tungsten crystals having a grain size in the range of 10 to 120 vim, as observed in terms of an area ratio of 300 μm×300 μm in unit area in a side cross section of the barrel.