Title:
X-RAY TUBE
Document Type and Number:
WIPO Patent Application WO/2023/119689
Kind Code:
A1
Abstract:
An X-ray tube according to an embodiment of the present invention comprises: a positive electrode having a target layer that emits X-rays in response to the incidence of an electron beam; and a negative electrode in which three electron guns are arranged in parallel, each having a filament for emitting electrons, a stowage groove in which the filament is stowed, and a focusing groove for causing the electrons emitted from the filament to be focused as an electron beam at the target layer. The three electron guns are a central electron gun facing the positive electrode, and two side electron guns located on opposite sides of the central electron gun. In the central electron gun, the following match: a filament central axis running along the longitudinal direction at the center of the width direction of the filament; and a stowage groove central axis running along the longitudinal direction at the center of the width direction of the stowage groove match. The central electron gun is configured so that a focusing groove central axis running along the longitudinal direction at the center of the width direction of the focusing groove is offset from the filament central axis.
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| JP4287416 | Electron emission device |
Inventors:
TAKAHASHI NAOKI (JP)
Application Number:
PCT/JP2022/022734
Publication Date:
June 29, 2023
Filing Date:
June 06, 2022
Export Citation:
Assignee:
CANON ELECTRON TUBES & DEVICES CO LTD (JP)
International Classes:
H01J35/06
Domestic Patent References:
| WO2021049639A1 | 2021-03-18 |
Foreign References:
| JPS59165353A | 1984-09-18 | |||
| JP2004265606A | 2004-09-24 | |||
| US4685118A | 1987-08-04 |
Attorney, Agent or Firm:
S & S INTERNATIONAL PPC (JP)
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