| 摘要 |
A disk cartridge is provided which includes a cartridge body ( 2 ) including a lower shell ( 6 ) having formed therein a first opening ( 24 ) for write and/read and an upper shell ( 7 ) butt-joined to the lower shell ( 6 ), a rotation wheel ( 4 ) housed rotatably in the cartridge body ( 2 ) and which houses a disk ( 3 ) and has formed therein a second opening ( 44 ) corresponding to the fist opening ( 24 ) and through which the housed disk ( 3 ) is exposed to outside, a pair of shutter plates ( 5 a, 5 b) provided between the lower shell ( 7 ) and rotation wheel ( 4 ) and which operates with the rotation of the rotation wheel ( 4 ) to uncover the first and second openings ( 24, 44 ) when the latter are coincide with each other, and a locking mechanism ( 71 ) including a shaft portion ( 76 ) installed pivotably to the upper shell ( 6 ) and engaged in an engagement concavity ( 85 ) in the rotation wheel ( 4 ) to lock the rotation wheel ( 4 ) in a position where the pair of shutter plates ( 5 a, 5 b) covers the first opening ( 14 ), and an unlocking portion ( 77 ) which cancels the engagement of the locking portion ( 76 ) in the engagement concavity ( 85 ).
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