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:
Dec. 22, 2020
Filed:
Dec. 20, 2018
Canon Electron Tubes & Devices Co., Ltd., Otawara, JP;
Takashi Shimono, Nasushiobara, JP;
Naoki Takahashi, Nasushiobara, JP;
CANON ELECTRON TUBES & DEVICES CO., LTD., Otawara, JP;
Abstract
According to one embodiment, an x-ray tube includes a cathode and an anode. The cathode includes a filament coil and a focusing electrode that includes a valley bottom part, a first inclined plane rising from the valley bottom part and inclined in the direction of the anode, a first focusing groove, and a first receiving groove. The anode includes a target surface. θ>0°. The filament coil, the first receiving groove, and the first focusing groove are positioned more to a third extended line side than a first reference plane. One end part of the first receiving groove is closer to the first reference plane than the other end part.