Title:
ELECTRON GUN AND ELECTRON BEAM APPLICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/137332
Kind Code:
A1
Abstract:
The present invention has a photocathode 13 comprising a substrate 11 and a photoelectric film 12 formed on the substrate, a light source 1 for emitting pulsed excitation light, a condenser lens 4 disposed to face the substrate of the photocathode and condensing the pulsed excitation light toward the photocathode, a first anode electrode 22 and a second anode electrode 23 disposed so as to face the photoelectric film of the photocathode, a first power source for applying a first control voltage between the first anode electrode and the second anode electrode, and a second power source for applying an acceleration voltage between the photocathode and the second anode electrode, wherein the first anode electrode is disposed between the photocathode and the second anode electrode, the surface of the first anode electrode facing the second anode electrode has a concave shape, the surface of the second anode electrode facing the first anode electrode has a convex shape, and the first control voltage is set such that the photocathode has a higher surface electric field intensity than the surface electric field intensity when the acceleration voltage is applied to the second anode electrode in the absence of the first anode electrode.
Inventors:
MORISHITA HIDEO (JP)
OHSHIMA TAKASHI (JP)
OSE YOICHI (JP)
AGEMURA TOSHIHIDE (JP)
KUWAHARA MAKOTO (JP)
OHSHIMA TAKASHI (JP)
OSE YOICHI (JP)
AGEMURA TOSHIHIDE (JP)
KUWAHARA MAKOTO (JP)
Application Number:
PCT/JP2020/047913
Publication Date:
June 30, 2022
Filing Date:
December 22, 2020
Export Citation:
Assignee:
HITACHI HIGH TECH CORP (JP)
NATIONAL UNIV CORPORATION TOKAI NATIONAL HIGHER EDUCATION AND RESEARCH SYSTEM (JP)
NATIONAL UNIV CORPORATION TOKAI NATIONAL HIGHER EDUCATION AND RESEARCH SYSTEM (JP)
International Classes:
H01J3/02; H01J37/073
Foreign References:
| JP2013045525A | 2013-03-04 | |||
| JP2007258119A | 2007-10-04 | |||
| JP2001143648A | 2001-05-25 | |||
| JPH11509360A | 1999-08-17 | |||
| CN108428610A | 2018-08-21 | |||
| JP6722958B1 | 2020-07-15 | |||
| JP6762635B1 | 2020-09-30 |
Attorney, Agent or Firm:
POLAIRE I.P.C. (JP)
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