Patent ID: 7526069
Filing Date: 2009-04-28
Classification: H01J

Abstract:
1. An X-ray tube for emitting X-rays through a transmission window, comprising: a closed vessel including an opening for defining said transmission window, said closed vessel having a glass faceplate which contains an alkaline ion, said glass faceplate having: a first major surface at least a part of which constitutes a part of a vacuum inner space of said closed vessel, a second major surface opposing said first major surface, and a through hole communicating between said first and second major surfaces; an electron source, arranged in said closed vessel, for emitting electrons; an X-ray target, arranged in a space defined by an inner wall of said through hole of said glass faceplate, receiving the electrons emitted from said electron source and generating the X-rays; and a silicon foil constituting said transmission window and having a thickness of 3 μm or more but 30 μm or less, said silicon foil being directly affixed on said glass faceplate by an anode bonding, while entirely covering one opening end of said through hole of said glass faceplate.