| 摘要 |
PROBLEM TO BE SOLVED: To provide a fixed anode X-ray tube having a wide-angle X-ray irradiation angle. SOLUTION: An X-ray irradiation window part 36 disposed at a central part of an envelope 16 and made of a metal material is composed of a metal cylinder 42 surrounding a proximity of a focus 58 on a target 18 of an anode 14; an irradiation cylinder 44 wholly shaped like a corn; and an X-ray window 46 attached to a bottom part of the cylinder 44. A corn-like part 50 of the cylinder 44 is fitted into an approximately circular hole 42a opened in an X-ray irradiation direction 60 on a side face of the cylinder 42 and an outer circumference of the corn-like part 50 is connected to the hole 42a. An opening angle, by which an inner circumference of the cylinder 44 is anticipated in the direction 60 from the focus 58, is set greater than a prescribed X-ray irradiation angle, for example, greater than 80 degrees. COPYRIGHT: (C)2005,JPO&NCIPI
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