| 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 (5a, 5b) 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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