| 摘要 |
<p>To provide a magnetic disk unit in which there has been adopted a structure fixing a base and a top plate and preventing a deformation by a bimetal effect. It has a magnetic disk 4; a head drive mechanism 5, 6 in which there has been mounted a head accessing the magnetic disk; a base 2 accommodating the magnetic disk and the head drive mechanism, and possessing a flat part 2d, in which a threaded hole 2e has been formed, in a circumference of an opening edge 2c; and a top cover 3 which is formed by a material whose thermal expansion coefficient differs from the base, in which there is provided an escape hole 3a, for a screw, position-aligned to the threaded hole of the flat part, and which is attached to the base by the screw 10 penetrating through the threaded hole and the escape hole for the screw; and in it slip means 20 reducing a slip friction resistance are provided respectively in a contact portion between the flat part and the top cover, and a contact portion between a head part of the screw and the top cover.</p> |
