Patent ID: 6057656
Filing Date: 2000-05-02
Classification: H01F,H05H

Abstract:
A magnet block assembly for an insertion device which comprises:(A) at least two oppositely facing composite magnet blocks with an air gap therebetween each consisting of a base block of a permanent magnet provided with a plurality of slits each running across the base block between two cantilever sectional parts in the base block at regular intervals, the cantilever sectional parts being magnetized in an alternately reversed direction across the air gap or in parallel to the length-wise direction of the base block; and(B) a plurality of insert magnet pieces or insert pole pieces of a soft magnetic material each inserted into one of the slits in the base blocks, the direction of magnetization of the insert magnet pieces being perpendicular to that of the cantilever sectional parts of the base block.