A New Permanent Magnet Lens System and its Characteristics

Abstract

A new electron lens system of electron microscope excited with permanent magnets has been designed.
It has variable magnification of over a wide range, a resolution of 30 A, and is possible to obtain diffraction patterns.
The construction of magnetic circuits, characteristics of double gap lens and three stage lens system, variable method of focal length are described and micrographs taken by the instrument are shown.