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:
Aug. 22, 2017
Filed:
Oct. 07, 2014
Toshiba Electron Tubes & Devices Co., Ltd., Otawara-shi, JP;
Hiroshi Kanasaki, Kawasaki, JP;
Hideyuki Takahashi, Otawara, JP;
Keiichi Mimori, Nasu, JP;
Masataka Ueki, Nasushiobara, JP;
Toshiba Electron Tubes & Devices Co., Ltd., Otawara-shi, JP;
Abstract
According to one embodiment, an X-ray tube includes an elongated anode target, a cathode, and a vacuum envelope. The cathode includes an electron emission source and a converging electrode including a trench portion. The trench portion includes a closest inner circumferential wall, an upper inner circumferential wall, and a lower inner circumferential wall. The electron emission source projects towards a opening of the trench portion from a boundary between the closest inner circumferential wall and the upper inner circumferential wall.