| 摘要 |
PURPOSE:To lift an ornamental mobile stably to a high position and increase visual effect by lifting a mobile in which a magnet or the like it incorporated without touching the mobile in the ring of a superconductor where a residual magnetic field is formed by the use of a ring superconductor consisting of an oxide system superconducting material. CONSTITUTION:A superconductor 21 made of a material that is strong in a pin- fastening force is sealed in a ring liquid nitrogen container 22 together with liquid nitrogen. The superconductor 21 is formed into a ring shape. If an external magnetic field having a uniform magnetic field distribution is impressed to the superconductor by a electromagnet 23, a residual magnetic field is formed in the superconductor and then, the superconductor holds the magnetic field even though the electromagnet is removed. The formation of the residual magnetic field for the ring superconductor makes it possible to form even the magnetic field having different intensity in a circumferential direction. Since an electromagnet 32 is lifted in a ring superconductor 31 as long as the magnetic field is formed, the ring superconductor 1 is formed into a shape that is bent irregularly and is housed in a liquid nitrogen container 2. In this way, when a magnet 4 is incorporated into a mobile 3, i.e., a lifted object and the liquid nitrogen container 2 is rotated by a rotation driving device 5, the mobile 3 performs oscillatory motions. |
