Title:
X-RAY TUBE
Document Type and Number:
WIPO Patent Application WO/2021/049639
Kind Code:
A1
Abstract:
An X-ray tube pertaining to an embodiment is provided with: an anode having a target layer and an outer peripheral part; and a cathode having a filament having a major axis in a first direction and an electron-focusing cup for focusing an electron beam emitted from the filament. The electron-focusing cup has: a first surface positioned on the anode side; and an electron-focusing groove that opens on the first surface and accommodates the filament. The first surface has a first edge part positioned on the open side and a second edge part positioned on the open side and facing the first edge part in the first direction. The first edge part is closer to the outer peripheral part than the second edge part is, and when the distance between the first edge part and the filament in the first direction is defined as a first distance and the distance between the second edge part and the filament in the first direction is defined as a second distance, the first distance is shorter than the second distance.
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Inventors:
SHIMIZU KATSUNORI (JP)
TAMURA HISAYUKI (JP)
SASABE AKIHIRO (JP)
TAMURA HISAYUKI (JP)
SASABE AKIHIRO (JP)
Application Number:
PCT/JP2020/034563
Publication Date:
March 18, 2021
Filing Date:
September 11, 2020
Export Citation:
Assignee:
CANON ELECTRON TUBES & DEVICES CO LTD (JP)
International Classes:
H01J35/06; H01J35/14
Foreign References:
| JP2019036460A | 2019-03-07 | |||
| JP2001068045A | 2001-03-16 | |||
| JPS59165353A | 1984-09-18 | |||
| JP2001135265A | 2001-05-18 |
Other References:
See also references of EP 4030459A4
Attorney, Agent or Firm:
S & S INTERNATIONAL PPC (JP)
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