Patent ID: 7448056

Claim:
A disc cartridge comprising: a cartridge body including a disc storage portion and a bottom window, wherein the disc storage portion has a disc window and a bottom and stores a disc, having first and second sides, therein so that the disc is rotatable there and that the first side is exposed through the disc window; and the bottom window is opened through the bottom of the disc storage portion so as to get the disc chucked externally and to allow a head, which reads and/or writes information, to access the second side of the disc; at least one shutter, provided on the bottom of the disc storage portion, for opening or shutting the bottom window; a rotational member, which is supported by the cartridge body so as to be rotatable therein and is interlocked with the shutter so as to open and close the shutter by rotating itself; a disc holding portion for interlocking with the shutter that is opening or closing so as to hold the disc onto either the shutter or the cartridge body when the shutter shuts the bottom window and to release the disc when the shutter opens the bottom window; and a stopper member, which is supported by the cartridge body so as to be movable from a position protruding into the disc window to a position not protruding into the disc window, or vice versa, wherein the disc holding portion interlocks with the stopper member, and releases the disc when the stopper member has moved to the position not protruding into the disc window.