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. 29, 2000
Filed:
Aug. 28, 1998
Katsushige Tsuno, Tokyo, JP;
JEOL Ltd., Tokyo, JP;
Abstract
A transmission electron microscope that produces a monochromated electron beam and thus has improved spatial resolution. This microscope has a retarding monochromator mounted between the first anode (extraction electrode) of a field emission gun (FEG) and the second anode. The monochromator includes a decelerating portion, a Wien filter and an accelerating portion. An exit slit is so positioned that this exit slit and the object plane of the monochromator are symmetrical with respect to the center of the Wien filter. The beam extracted by the cathode of the gun is monochromated by the monochromator and so the chromatic aberrations can be improved. Consequently, the spatial resolution can be improved.