MULTI-CIRCULAR BIPOLAR MAGNET

PROBLEM TO BE SOLVED: To shorten a production time at a low manufacturing cost regardless of the size of the diameter of a bipolar magnet body having the same magnetic-force working as a columnar bipolar magnet. SOLUTION: A multi-circular bipolar magnet 1 has a rotating shaft 2 at a center for enabling a rotation. When a ferromagnetic substance is used as the magnet body 1, a circular magnet 4 as a single body is magnetized on a semi-circumferential section so that a plurality of circular magnet n-poles 5a to 5l generate a magnetic force on the outside on the circumference of a columnar, a discoidal or a piece-shaped multi-circular bipolar magnet 1 body, and the circular magnet 4 is magnetized on the semi-circumferential section on the reverse side so that a plurality of circular magnet s-poles 6a to 6l generate the magnetic force on the outside. When a diamagnetic substance is used as the bipolar magnet body 1, a ferromagnetic-substance ring 3 is installed, the circular magnet 4 as the single body is magnetized on the semi-circumferential section so that a plurality of the magnet n-poles 5a to 5l generate the magnetic force on the outside, and the circular magnet 4 is magnetized on the semi-circumferential section on the reverse side so that a plurality of the magnet s-poles 6a to 6l generate the magnetic force on the outside. COPYRIGHT: (C)2005,JPO&NCIPI