| 摘要 |
A disk cartridge housing an optical disk ( 3 ) is provided which includes a cartridge body ( 2 ) including a lower shell ( 7 ) having formed therein a first opening ( 24 ) for write and/read and an upper shell ( 6 ) butt-joined to the lower shell ( 7 ), a rotation wheel ( 4 ) housed rotatably in the cartridge body ( 2 ) and which houses the 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, and a pair of shutter plates ( 5 a, 5 b) which are pivoted in conjunction with the rotation of the rotation wheel ( 4 ) to uncover the first and second openings ( 24, 44 ) when the latter coincide with each other. The rotation wheel ( 4 ) has formed at the front side thereof, at which the disk cartridge is first inserted into a disk recorder and/or player, a to-be-operated portion ( 45 ) in which a shutter releasing portion of the disk recorder and/or player is engaged, and the to-be-operated portion ( 45 ) is formed from a concavity opening the front side of the disk cartridge at which the latter is first inserted into the disk recorder and/or player.
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