| 摘要 |
PURPOSE:To provide a uniform magnetic field magnet economically and effectively by providing a control means of creeping direction components of a magnetic flux composed of a low-permeability part formed to prevent the passage of a magnetic flux and a path of magnetic flux surrounding said low-permeability part, nearly in the center of the connection part of a pole piece and a yoke part. CONSTITUTION:For a low-permeability part 41, a disc-form gap of several millimeters thickness is enough and the recess can be formed on either a pole piece 3 side or a yoke 2 side. A non-magnetic material such as an insulating material may be interposed in the recess. A path 42 of magnetic flux is a path of a magnetic flux line 113 interrupted from passing by the low-permeability part 41 and the path 42 is formed of a magnetic material in a manner it swells outward to the peripheral side of the yoke part 2 by only the corresponding quantity on an area of the low-permeability part 41. As the magnetic flux line 11 passing the yoke part 2 is prevented from passing by the low-permeability part 41, it enters in a pole piece 3 through the path 42. At that time, the magnetic flux lines 13 separate to the center side and outer side with the path part 42 as a boundary to expand in the pole piece.
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