The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 16, 2021
Filed:
Jun. 10, 2020
Applicant:
New Japan Radio Co., Ltd., Tokyo, JP;
Inventors:
Assignee:
New Japan Radio Co., Ltd., Tokyo, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H01J 13/02 (2006.01); H01J 3/02 (2006.01); H01J 3/10 (2006.01);
U.S. Cl.
CPC ...
H01J 3/027 (2013.01); H01J 3/024 (2013.01); H01J 3/029 (2013.01); H01J 3/10 (2013.01); H01J 2201/28 (2013.01);
Abstract
An electron gun comprising a cathode having an electron emitting surface and whose planar shape is circular; a heater; an anode being arranged to oppose the cathode; and a heat resistant member. The anode applies a positive potential relative to the cathode to extract electrons in a predetermined direction. The cathode has, in a central portion thereof, a through hole along a central axis of the cathode. The heat resistant member has a first portion to close the through hole and a second portion being positioned between the cathode and the heater.