Patent ID: 7783011
Filing Date: 2010-08-24
Classification: H01J

Abstract:
1. A penetrating X-ray tube comprising: a stem unit having a plurality of through-holes and is made of an insulating material; a plurality of electrode leads being extended so that one end is affixed to the stem unit and the other end is to be apart from the top surface of the stem unit; a cupped irradiating window frame made of copper and positioned to be facing a cathode filament, said cupped irradiating window frame having an aperture on a closed end thereof; an X-ray transmission irradiating window with which the aperture of the cupped irradiating window frame is air-tightly sealed; a tubular sealing member made of either of a Kovar material, Fe or Fe—Ni alloy, the tubular sealing member having one end welded airtight to an open end of the cupped irradiating window frame and the other end air-tightly joined to the stem unit; and an exhaust tube that is air-tightly sealed after one end is air-tightly joined to the bottom surface of the stem unit; wherein the cupped irradiating window frame covers an outer surface of the tubular sealing member so that the cupped irradiating window frame is melted exclusively and affixed to the tubular sealing member throughout the entire circumference.