Patent ID: 7986205

Claim:
A magnetic field control method using a pair of coaxially disposed magnetic field generating units each having a first main surface opposed in parallel to the other with a gap and formed with a plurality of magnetic poles, for controlling a magnetic field generated by the pair of magnetic field generating units, sandwiched by the pair of magnetic field generating units and being at a target position on a predetermined plane which is in parallel to the first main surface, the method comprising: a step of changing an orientation of the magnetic field at the target position on the predetermined plane by rotating each of the magnetic field generating units in a same one direction of circumferential directions by a same angle, and a step of changing an inclination of the orientation of the magnetic field at the target position with respect to the predetermined plane by at least rotating one of the magnetic field generation units and rotating another one of the magnetic field generation units in the pair in a circumferential direction so as to change a positional relationship between the magnetic pole in one of the magnetic field generating units and the magnetic pole in the other of the magnetic field generating units, wherein one of the magnetic field generation units is rotated by a first rotation drive unit, another one of the magnetic field generation units being rotated by a second rotation drive unit, and the first and the second rotation drive units being driven separately from each other.