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:
Sep. 14, 1999
Filed:
Dec. 02, 1997
Toshikatsu Kaneyama, Tokyo, JP;
JEOL Ltd., Tokyo, JP;
Abstract
There is disclosed an .OMEGA.-filter for use with an electron microscope. This filter has only one parameter that controls the exciting currents supplied to four magnets M.sub.1 -M.sub.4. Only those electrons of incident electrons that have a given energy pass through the successive magnets and emerge from the filter. The coils of the magnets M.sub.1 and M.sub.4 are identical in number of turns and connected in series. Similarly, the coils of the magnets M.sub.2 and M.sub.3 are identical in number of turns and connected in series. When a human operator specifies an exciting current i.sub.1 through an entry device, a controller causes a power supply P.sub.1 to produce this exciting current i.sub.1, thus exciting the magnets M.sub.1 and M.sub.4. The controller calculates an exciting current i.sub.2 from the exciting current i.sub.1, and causes a power supply P.sub.2 to produce this exciting current i.sub.2, thus exciting the magnets M.sub.2 and M.sub.3.