公开(公告)号：US3812365A

公开(公告)日：1974-05-21

申请号：US33988173

申请日：1973-03-09

Applicant: LEPOOLE J

Inventor： LEPOOLE J

IPC: H01J37/14 ,  H01J37/143 ,  H01J37/00

CPC classification number: H01J37/14 ,  H01J37/143

Abstract: A magnetic lens system, in particular for an electron microscope, comprising two thin small disc magnets, provided with small openings and magnetized axially in opposite directions, which are united straight into an electron-optic achromatic as well as rotation-free and distortionfree system that forms lens fields, at a distance that is practically equal to the diameter of the small openings.