US 5,334,910 A · Interlocking periodic permanent magnet assembly for electron tubes and method of making same

Abstract

The present invention is a periodic permanent magnet (PPM) assembly used to produce a focussing field within an electron tube, and the corresponding method of manufacturing the same. The present invention PPM includes producing two opposing semi-cylindrical stacks by alternately stacking semi-annular shaped magnets and pole pieces. Once the two semi-cylindrical stacks are formed, they are joined around the electron tube, such that the various pole pieces and magnets of the two semi-cylindrical stacks align. As a result of the joining of the two semi-cylindrical stacks, a cylindrical periodic permanent magnet assembly is formed around the electron tube in a cost effective and labor efficient manner.

Claims14

Dependent claims

A cylindrical periodic permanent magnet assembly through which a length of an electron tube passes, comprising:

a plurality of annular pole pieces, wherein each of said plurality of pole pieces is comprised of a first semi-annular member, having a male locking projection extending therefrom, and a second semi-annular member having a receptacle disposed therein, whereby the receptacle from each said second semi-annular member receives the male locking projection from a corresponding first semi-annular member thereby interconnecting each said first semi-annular member to a corresponding second semi-annular member;
a plurality of ring magnets interposed with said plurality of annular pole pieces such that each of said magnets is respectively juxtaposed between adjacent ones of said plurality of said pole piece.

A method of forming a cylindrical periodic permanent magnet assembly around an electron tube, comprising the steps of:

providing a plurality of semi-annular shaped first pole pieces, each first pole piece having a locking projection extending therefrom;
providing a plurality of semi-annular shaped first magnet members;
alternately stacking said semi-annular shaped first magnet members and said semi-annular shaped first pole pieces thereby forming a first semi-cylindrical assembly wherein each of said first magnet members is respectively juxtaposed between adjacent ones of said first pole pieces;
providing a plurality of semi-annular shaped second pole pieces, each second pole piece having a receptacle formed therein;
providing a plurality of semi-annular shaped second magnet members;
alternately stacking said semi-angularly shaped second magnet members and said semi-angularly shaped second pole pieces thereby forming a second semi-cylindrical assembly wherein each of said second magnet members is respectively juxtaposed between adjacent ones of said second pole pieces;
placing said electron tube in between said first a semi-cylindrical assembly and said second semi-cylindrical assembly;
and
joining said first semi-cylindrical assembly to said second semi-cylindrical assembly around said electron tube such that said first magnet members and said second magnet members correspondingly align and said first pole pieces and said second pole pieces correspondingly align wherein each said locking projection on said first semi-cylindrical assembly passes into a corresponding receptacle in said second semi-cylindrical assembly thereby interconnecting said first semi-cylindrical assembly to said second semi-cylindrical assembly.

6 more elements

Dependencies are inferred from the claim text.

Interlocking periodic permanent magnet assembly for electron tubes and method of making same

Life of this patent

Interlocking periodic permanent magnet assembly for electron tubes and method of making same

Life of this patent

Abstract

Claims14