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A dipole magnet structure includes a pair of spaced pole pieces and a pair of permanent magnets secured in alignment with the pole pieces and connected by a magnetically conductive yoke for producing a uniform magnetic field within a predetermined spacial volume therebetween. The opposed faces of th

A dipole magnet structure includes a pair of spaced pole pieces and a pair of permanent magnets secured in alignment with the pole pieces and connected by a magnetically conductive yoke for producing a uniform magnetic field within a predetermined spacial volume therebetween. The opposed faces of the pole pieces are dish-shaped with a flat center area surrounded by an outwardly and forwardly curved rim surface which extends from the center area and which increases in forward curvature as it extends away from the center area to insure homogeneity in the predetermined spacial volume as defined by the space between the pole piece center areas.

대표청구항 ▼

[ What is claimed is:] [1.] A dipole magnet structure for producing a magnetic field within a predetermined spacial volume comprisingfirst and second pole pieces disposed in spaced relationship and each having a face area and a rim extending entirely about the periphery of said face area, the rims o

[ What is claimed is:] [1.] A dipole magnet structure for producing a magnetic field within a predetermined spacial volume comprisingfirst and second pole pieces disposed in spaced relationship and each having a face area and a rim extending entirely about the periphery of said face area, the rims of the pole pieces extending toward each other and including throughout their length a curved surface extending outwardly from the adjacent face area, and said face areas being disposed in alignment in parallel planes so as to define said predetermined spacial volume therebetween, said curved surface being defined by a formula whereby its projection in the direction parallel to the face area is greater than its projection in the direction perpendicular to the face area and increases in curvature as it increases in distance outwardly of the face area and wherein the distance in the direction parallel to the face area relative to the distance perpendicular to the face area includes a term raised to a power of two or more,a yoke member of magnetically conductive material connecting said pole pieces outside of said predetermined spacial volume so as to provide a complete magnetic circuit,and means for creating a magnetic field through said predetermined spacial volume, said rim and face areas of said pole pieces serving to make the magnetic field between the pole pieces uniform within said predetermined spacial volume.