| 摘要 |
A cartridge ( 2 ) contains a recording disk ( 4 ) having photosensitivity. The cartridge comprises a cartridge shell ( 11 ), a light shielding plate ( 12 ) and a shutter ( 13 ). The cartridge shell has an internal opening ( 18 ) for exposing a central portion and a recording surface of the recording disk to the outside. The light shielding plate is attached to an outer side of the cartridge shell and has an external opening ( 14 ) confronting the internal opening. The shutter is slidably disposed between the cartridge shell and the light shielding plate to open and close the internal opening. A lock mechanism locks the shutter in a closed position. For releasing the lock mechanism, it is necessary to slide a first lock member ( 63 ), which is exposed through a cavity ( 72 ), in a state that a second lock member ( 64 ) projecting into a groove ( 7 ) is pushed into the cartridge shell.
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