Permanent magnet ring

Abstract

In a permanent magnet ring ( 1 ) formed by arranging a plurality of unit permanent magnets ( 21 a , 21 b , 21 c . . . ), each of a plurality of the unit permanent magnets ( 21 a , 21 b , 21 c . . . ) is formed in a circular cylindrical shape having a circular cross section, and a predetermined number of the unit permanent magnets are magnetically attracted each other so as to form a ring shape having a predetermined size, so that it is possible for the user to easily structure the permanent magnet ring ( 1 ) having a desired size, and it is possible to attach as many the unit permanent magnets as possible so as to be able to apply proper magnetic force lines to each part of the body.

1 - 10 . (canceled)  
   
   
       11 . A method of manufacturing unit permanent magnets in a permanent magnet ring structured such that each of the unit permanent magnets constituting the permanent magnet ring is formed in a cylindrical shape, a spherical shape, a flat shape, or a disc shape, and a predetermined number of unit permanent magnets are magnetically attracted to each other in respective side surfaces, comprising the steps of: 
 preparing an ingot on the basis of a raw material including a rare earth element;    crushing the ingot;    thereafter arranging crystals in a determined easily magnetizing direction at a time of molding in a magnetic field;    manufacturing a block-shaped formed body in accordance with said molding in the magnetic field;    thereafter manufacturing a block-shaped sintered body by sintering;    working each of the unit permanent magnet raw materials in said cylindrical shape, said spherical shape, said flat shape, or said disc shape;    thereafter forming a plated layer and a siliceous coating layer on a surface thereof;    next forming an N pole or an S pole on one part of a side surface orthogonal to said easily magnetizing direction of each of the unit permanent magnets by magnetizing the product thus made along said easily magnetizing direction, and the S pole or the N pole on another part of the side surface opposite to said one part of the side surface; and    forming the side surface, on which the magnetic poles of the unit permanent magnet are formed, as a curved surface.