Title:
ELECTRON GUN, X-RAY GENERATION DEVICE, AND X-RAY IMAGING DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/136912
Kind Code:
A1
Abstract:
This electron gun is provided with a cathode having an electron emission portion, an extraction electrode which extracts electrons emitted from the electron emission portion, and a convergence electrode which converges the electrons extracted by the extraction electrode. The convergence electrode includes an outer electrode having a tubular shape, and an inner electrode disposed inside the outer electrode, the inner electrode defines a columnar first space, and has a first surface on the cathode side and a second surface opposite to the first surface, and the inner surface of the outer electrode and the second surface of the inner electrode define a second space. The inner electrode has an electron passage hole through which electrons pass, and a communication portion that communicates the first space and the second space.
Inventors:
TSUJINO KAZUYA (JP)
NOMURA ICHIRO (JP)
NOMURA ICHIRO (JP)
Application Number:
PCT/JP2018/048608
Publication Date:
July 02, 2020
Filing Date:
December 28, 2018
Export Citation:
Assignee:
CANON ANELVA CORP (JP)
International Classes:
H01J1/46; H01J35/14
Foreign References:
| JP2000030641A | 2000-01-28 | |||
| JP2000048746A | 2000-02-18 | |||
| JP2012004060A | 2012-01-05 | |||
| JP2011134498A | 2011-07-07 | |||
| JP2007265917A | 2007-10-11 |
Other References:
See also references of EP 3905299A4
Attorney, Agent or Firm:
OHTSUKA, Yasunori et al. (JP)
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