| 摘要 |
<p>The spindle (12) for a disk drive comprises a dish-like hub (21) for centering a removable recording disk (16) and a magnetic chuck (22) for clamping the recording disk against an axial position reference surface on the hub. To stably centre the recording disk on the spindle and to provide a reference surface for controlling the axial positioning of the disk, the hub has a central conical post (23) which extends axially of the spindle beyond the plane of a radially displaced annular rim or flange (24). The post narrows toward its free outer end (25) with a fixed taper, so that the recording disk seats thereon and makes interference contact therewith before reaching the plane of the rim. To clamp the disk to the hub and to seat it against the rim, the magnetic chuck (22) comprises an annular magnet (31) which is disposed between the post and rim and a strike ring (32) which is engaged with or embedded in an inner circumferential portion of the disk for deflecting the recording disk into contact with the rim. For example, if the recording disk is configured as a so-called «air sandwich» for what is known as «second surface» optical recording, the strike ring is adavan- tageously embedded in the disk while the air sandwich is being assembled.</p> |
