公开(公告)号：US3859613A

公开(公告)日：1975-01-07

申请号：US43548374

申请日：1974-01-22

Applicant: THOMSON CSF

Inventor： BLAMOUTIER MICHEL ,  FRALEUX JEAN

IPC: H01J31/28 ,  H01J29/64 ,  H01J29/68 ,  H01F7/00

CPC classification number: H01J29/68

Abstract: A device for focussing an electron beam in an electronic tube, using an axial magnetic field. It is constituted by a stack of permanent magnets, disposed in an annular fashion around the electronic tube; said magnets consist of washers, whose magnetisation is normal to their faces.

Abstract translation: 一种用于使用轴向磁场将电子束聚焦在电子管中的装置。 它由一堆永久磁铁构成，围绕电子管以环形方式设置; 所述磁体由垫圈组成，其磁化正常于其表面。