Title:
ELECTRON GUN
Document Type and Number:
WIPO Patent Application WO/2021/253197
Kind Code:
A1
Abstract:
An electron gun may include a cathode with an emitting surface configured to emit electrons. The cathode may include a through hole that goes through the emitting surface and is configured to allow back-streaming electrons of the emitted electrons to pass through. The electron gun may also include an anode configured to attract the emitted electrons from the cathode to the anode and focus the emitted electrons into an electron beam. The electron gun may also include a grid structure configured to facilitate the focusing of the emitted electrons, the grid structure being positioned corresponding to the through hole.
Inventors:
SONG RUIYING (CN)
CHENG PENG (CN)
CHENG PENG (CN)
Application Number:
PCT/CN2020/096230
Publication Date:
December 23, 2021
Filing Date:
June 15, 2020
Export Citation:
Assignee:
SHANGHAI UNITED IMAGING HEALTHCARE CO LTD (CN)
International Classes:
H01J3/02; H01J29/48
Foreign References:
| CN202857121U | 2013-04-03 | |||
| US20190272969A1 | 2019-09-05 | |||
| US20160056006A1 | 2016-02-25 | |||
| US5936335A | 1999-08-10 | |||
| US4994709A | 1991-02-19 |
Attorney, Agent or Firm:
METIS IP (CHENGDU) LLC (CN)
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