Patent attributes
A disc cartridge includes a cartridge main body 2, a rotation wheel 4 rotatably accommodated in the cartridge main body 2, a pair of shutter plates 5a, 5b interposed between a lower shell 7 and the rotation wheel 4 for releasing a first opening 24 of a lower shell 7 and a second opening 44 of the rotation wheel 4 in association with the rotation of the rotation wheel 4 when the first opening 24 coincides with the second opening 44, and a locking member 72 for prohibiting the rotation of the rotation wheel 4. The locking member 72 includes a locking portion 76 engaged with an engaging recessed portion 85 of the rotation wheel 4 for locking the rotation wheel 4 at a position where the shutter plates 5a, 5b close the first opening 24 and a first and second unlocking pieces 77, 78 for releasing the state that the locking portion 76 is engaged with the engaging recessed portion 85. The first unlocking piece 77 is faced to an insertion guide groove 25b on the front surface of the cartridge main body 2, and the second unlocking piece 78 is faced to a guide groove 15 formed to a side surface of the cartridge main body 2 in the inserting direction thereof. The rotation wheel 4 unlocked by depressing any of the first and second unlocking pieces 77, 78. With this arrangement, an unlocking mechanism of a rerecording and/or replaying device can be simplified.
