| 摘要 |
PURPOSE:To improve S/N by surely protecting a magnetic core from an external magnetic wire by constituting a frame to fix the magnetic core of a superconducting material, and using a Meissner effect generated in a fixed frame. CONSTITUTION:Cores (1-4) are constituted of a magnetic material with high permeability, respectively. A first core 1, a second core 3, and a block 5 for shielding are inserted to and fixed on the fixed frame 7, then unified, and also, a first core 2, a second core 4, and a block 6 are inserted to and fixed on the fixed frame 8, then, unified. In such a case, the fixed frames 7 and 8 are constituted of the superconducting material, and they are unified with a screw 10, then, a magnetic head unit 11 is formed. And the unit 11 is inserted to a case 12 for magnetic shield consisting of the superconducting material, and is resin-molded, then, a magnetic head can be obtained. In such a way, the magnetic wire from the outside is shielded, thereby, a magnetic shield effect and the S/N can be improved. |
