| 摘要 |
<p>A record disk assembly for use on a disk drive unit wherein the assembly comprises an enclosure (36) (38) and a record disk (10) therein. The enclosure has aperture means (42) (44) for insertion therethrough of a transducer head of the disk drive unit and through which the record disk (10) can be engaged for rotation. A shutter mechanism (46) (48) associated with the aperture means (42) (44) is movable between a first position at least partially closing the aperture means and a second position opening the aperture means. The shutter mechanism (46) (48) is biased toward its aperture-closing position. An abutment member (54) of the disk drive unit enters into the enclosure (36) (38) to a position within the outer circumference of the record disk (10). The abutment member (54) engages surface means (56) (58) associated with the shutter mechanism to move the shutter mechanism from its aperture-closing position to its aperture-opening position.</p> |
