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:
Jan. 27, 2004
Filed:
Oct. 25, 2001
Applicant:
Inventor:
David Riley Whaley, Rolling Meadows, IL (US);
Assignee:
Northrop Grumman Corporation, Los Angeles, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J 7/24 ; G01N 2/101 ;
U.S. Cl.
CPC ...
H01J 7/24 ; G01N 2/101 ;
Abstract
An apparatus and a method of focusing a high-current-density electron beam emitted from a cold cathode electron emitter. A series of shaped electrostatic lense are provided in front an emission surface of the cold cathode electron emitter. An ion shield is further inserted in front of the emission surface. By applying different focusing voltages to the shaped electrostatic lenses, the electron beam is focused and well confined.