MAGNETIC FIELD GENERATOR

摘要

A permanent magnet type magnetic field generator (10) which can generate a ferro magnetic field of 3T or above in a field generation space (12). The magnetic field generator (10) has the field generation space (12) located at a central part in the axial direction thereof and comprises a first Haar-Bach type magnetic circuit (14) formed in the center on the outer circumference, and a second magnetic circuit (16) formed to surround the field generation space (12) on the inside of the first magnetic circuit (14). The first magnetic circuit (14) comprises permanent magnets (20a)-(20f), and the central part (A) of permanent magnets (22a)-(22f). The second magnetic circuit (16) comprises a pair of pole pieces (24a, 24b) having saturation magnetization of 1.6T or above, and the central part (B) of permanent magnets (26a)-(26d) for coupling the pair of pole pieces (24a, 24b) magnetically.