Focusing device with permanent magnets for electron tube and...

Details Focusing device with permanent magnets for electron tube and... Focusing device with permanent magnets for electron tube and...

H - Electricity

01

J

353/13

H01J 25/34 (2006.01) H01J 23/087 (2006.01)

Patent

CA 1153113

ABSTRACT OF THE DISCLOSURE A focusing device for an electron tube is cons- tituted by alternating magnets and pole pieces in the form of washers, which are fixed against one another in such a way as to form a cylinder surroun- ding the envelope of the tube and being of the same axis as the latter, the electron beam propagating along said axis. The magnetized washers have a cen- tral hole and are interrupted over part of their circumference by an opening permitting their fitting between the pole pieces previously fixed to the envelope.

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