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. 08, 2021
Filed:
Sep. 14, 2018
Applicant:
Jeol Ltd., Tokyo, JP;
Inventor:
Yuji Kohno, Tokyo, JP;
Assignee:
JEOL Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J 37/073 (2006.01); H01J 37/28 (2006.01); H01J 37/147 (2006.01);
U.S. Cl.
CPC ...
H01J 37/073 (2013.01); H01J 37/147 (2013.01); H01J 37/28 (2013.01); H01J 2237/022 (2013.01); H01J 2237/06341 (2013.01); H01J 2237/06375 (2013.01); H01J 2237/2802 (2013.01);
Abstract
A cold cathode field-emission electron gun includes: an emitter; an extraction electrode which extracts electrons from the emitter; and a biased electrode which is disposed closer to the emitter than the extraction electrode. A voltage applied to the biased electrode is variable.