Title:
ROTATING POSITIVE ELECTRODE X-RAY TUBE
Document Type and Number:
Japanese Patent JP3729896
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce extra-focal X rays, by forming into a special shape a surface neighboring to a focal track plane of a rotating positive electrode target.
SOLUTION: A disk-shaped rotating positive electrode target 11 is fixedly attached to a tubular body 13 of revolution via a shaft 12 and rotatably supported by a fixed body 15 via a bearing. An electron beam e from a filament cathode 17 of a negative electrode 16 disposed standing opposite to the positive electrode target 11 collides against a focus F on a surface of the positive electrode target 11, causing X rays to be generated. The X rays radiate with an expansion angle of about 16 degrees relative to a center axis Xa of a beam path X through an X-ray radiation window 19. A tapered inner circumferential recessed part 11m is provided neighboring an inner circumference of a focal track plane 11f, and this tapered surface is gradually recessed toward the shaft 12 at an angle of about 18 degrees relative to the beam center axis Xa. Because the tapered surface is not seen from the center axis Xa of the beam path X, extra-focal X rays due to electrons, which reach the target surface again after colliding against, and being reflected by, the target surface, are blocked.
Inventors:
Katsuhiro Ono
Koichi Kitade
Hideo Abu
Koichi Kitade
Hideo Abu
Application Number:
JP21881295A
Publication Date:
December 21, 2005
Filing Date:
August 28, 1995
Export Citation:
Assignee:
Toshiba Corporation
International Classes:
H01J35/10; (IPC1-7): H01J35/10
Domestic Patent References:
| JP1209640A | ||||
| JP3194834A | ||||
| JP51107789A |
Attorney, Agent or Firm:
Hiroshi Horiguchi
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