| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a protective barrier which requires no extra space around the installation location of a ferromagnetic field magnet device, and does not allow foreign matters to particularly come out around the barrier when opening. <P>SOLUTION: In the ferromagnetic field magnet device in this invention 1, the protective barrier which has a circular arc shape concentric to a cylindrical body and is formed of a nonmagnetic material is provided around the space between the cylindrical body and a ground surface. An open part of one side surface of the protective barrier is made to be an opening. Along the outer periphery of the protective barrier, a door formed of the nonmagnetic material which has a circular arc shape concentric thereto is provided while it is allowed to move around the center of the circular arc, and the opening is closed while opening and closing are allowed by the door. In the ferromagnetic field magnet device in this invention 2, in the invention 1, a substrate supporting the lower end of the door is, in an installation state, composed of a plurality of arc-like pieces which constitute a circular shape having a space inside for putting-in legs supporting the magnet body. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
