Patent ID: 7647603

Claim:
A disc cartridge characterized by comprising: a cartridge main body having a first opening for recording and/or replaying formed to a bottom surface, a groove formed to a front surface acting as an insertion edge to a recording and/or replaying device, and a guide groove formed to at least one side surface adjacent to the front surface; a rotation wheel rotatably accommodated in the cartridge main body as well as accommodating a disc and having a second opening corresponding to the first opening for facing the accommodated disc to the outside; a shutter mechanism interposed between the bottom surface of the cartridge main body and the rotation wheel for releasing the first and second openings in association with the rotation of the rotation wheel when the first opening coincides with the second opening; and a locking member rotatably attached to the inside of the cartridge main body and having a locking portion engaged with an engaging recessed portion formed to the outer peripheral side of the rotation wheel for locking the rotation wheel at a position where the shutter mechanism closes the first opening and first and second unlocking portions for releasing the state that the locking portion is engaged with the engaging recessed portion, wherein the first unlocking portion is faced to the groove, and the second unlocking portion is faced to the guide groove.