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:
Aug. 27, 2002
Filed:
Jun. 01, 2000
Applicant:
Inventors:
Assignee:
JEOL Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G21K 1/08 ; H01J 3/14 ; H01J 3/26 ; H01J 9/42 ; H01J 4/000 ; H01J 4/700 ;
U.S. Cl.
CPC ...
G21K 1/08 ; H01J 3/14 ; H01J 3/26 ; H01J 9/42 ; H01J 4/000 ; H01J 4/700 ;
Abstract
A compact magnetic energy filter having at least four magnetic fields to deflect the trajectory of an electron beam from the entrance window to the exit slit. A rotational symmetry axis is located midway between the second and third magnetic fields. The magnetic fields on the opposite sides of the rotational symmetry axis are opposite in polarity.