| 摘要 |
A DISK CATRIDGE IS PROVIDED WHICH INCLUDES AN OPTICAL DISK (2), A CATRIDGE BODY (5) HAVING FORMED THEREIN A HEAD OPENING (13) THROUGH WHICH A PART OF THE OPTICAL DISK (2) IS EXPOSED TO OUTSIDE IN A RANGE BETWEEN THE INNER AND OUTER RADII THEREOF, A SHUTTER MEMBER (15) SUPPORTED MOVABLY ON THE CATRIDGE BODY (5) TO UNCOVER AND COVER THE HEAD OPENING (13), AND A TWO-WAY FORCING MECHANISM (38) TO FORCE THE SHUTTER MEMBER (15) TOWARD ANY SELECTED ONE OF POSITIONS TO COVER AND UNCOVER THE HEAD OPENING (13). THE TWO-WAY FORCING MECHANISM (38) FORCES THE SHUTTER MEMBER (15) TOWARD ANY SELECTED ONE OF THE POSITIONS TO COVER AND UNCOVER THE HEAD OPENING (13) CORRESPONDINGLY TO A POSITION OF THE SHUTTER MEMBER (15) RELATIVE TO THE HEAD OPENING (13).
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