The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 21, 2010
Filed:
Mar. 20, 2009
Yasutaka Ito, Kawasaki, JP;
Hitoshi Hattori, Yokohama, JP;
Yasuo Yoshii, Kawasaki, JP;
Chiharu Tadokoro, Machida, JP;
Hironori Nakamuta, Otawara, JP;
Tetsuya Yonezawa, Yaita, JP;
Yasutaka Ito, Kawasaki, JP;
Hitoshi Hattori, Yokohama, JP;
Yasuo Yoshii, Kawasaki, JP;
Chiharu Tadokoro, Machida, JP;
Hironori Nakamuta, Otawara, JP;
Tetsuya Yonezawa, Yaita, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
In an X-ray tube, a rotary anode formed into a hollow disk-like shape is fixedly supported by a rotating body formed into a hollow cylindrical shape. A fixed shaft has fixed ends, columnar bearing portions and a disk part, and a flow path of a cooling medium formed along a central axis thereof. The bearing portions are inserted into the rotating body with a first gap between the columnar bearing portion and the rotating body, so that the rotating body is rotatably supported. The disk part is arranged in the rotary anode with a second gap between the disk part and the rotary anode. The first and second gaps are filled with a lubricant, bearing grooves are formed in the bearing portion, thereby forming dynamic pressure bearings, and a center of gravity of the rotary anode is arranged between the first and second dynamic pressure bearings.