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:
Jun. 30, 2015
Filed:
Feb. 25, 2011
Applicant:
Hiroshi Yasuda, Hasuda, JP;
Inventor:
Hiroshi Yasuda, Hasuda, JP;
Assignee:
Param Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J 29/48 (2006.01); H01J 1/148 (2006.01); H01J 1/26 (2006.01); H01J 37/075 (2006.01); H01J 37/317 (2006.01); H01J 37/065 (2006.01); H01J 37/07 (2006.01); H01J 37/26 (2006.01); B82Y 10/00 (2011.01); B82Y 40/00 (2011.01);
U.S. Cl.
CPC ...
H01J 29/485 (2013.01); H01J 1/148 (2013.01); H01J 1/26 (2013.01); H01J 37/075 (2013.01); H01J 37/3174 (2013.01); H01J 37/065 (2013.01); H01J 37/07 (2013.01); H01J 37/26 (2013.01); B82Y 10/00 (2013.01); B82Y 40/00 (2013.01);
Abstract
An electron gun cathode () is column shaped, and emits electrons by being heated. A holder (), which covers the bottom and sides of the electron gun cathode, has electrical conductivity and holds the electron gun cathode, and is composed of a material that does not easily react with the electron gun cathode when in a heated state, is provided. The tip of the electron gun cathode () protrudes from the holder () so as to be exposed, and electrons are emitted from the tip toward the front by applying an electric field to the tip.