| 摘要 |
PURPOSE:To impress a strong initial auxiliary magnetic field and to decrease a leak magnetic field by arranging two magnets with being faced each other at a comparatively closed position in a reverse phase and connecting the opposite sides of void parts in the two magnets with a yoke. CONSTITUTION:An optical disk 2 is a recording medium to be composed of magnetic multi-layer films. Then, the disk is fit to a spindle 1 and rotated. An optical head 3 is the irradiating means of a laser light and executes the recording of information and the reproducing and erasing of the recorded information. An initial auxiliary magnetic field impressing part 4 is arranged with sandwiching the optical head 3 and the disk 2, which is in the opposite side, in the void part. The initial auxiliary magnetic field impressing part 4 is constituted by causing two magnets 6 to be faced each other in the reverse phase with a void part 7 in the inside of the open edge of a U-shaped yoke 5 to have the open edge. Thus, the initial auxiliary magnetic field can be impressed and the leak magnetic field can be decreased. |
