Patent ID: 7007291

Claim:
A disc cartridge comprising: a cartridge body including a disc storage portion, a chucking opening and a head opening, 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 in the disc storage portion and that the first side of the disc is exposed inside the disc window; the chucking opening is formed on the bottom of the disc storage portion so as to get the disc chucked externally; and the head opening is also formed on the bottom of the disc storage portion so as to allow a head, which reads and/or writes a signal from/on the second side of the disc, to access the second side of the disc; and first and second shutters provided between the second side of the disc and the bottom of the disc storage portion, wherein the first shutter rotates around the center of the chucking opening; the center of rotation of the second shutter is located outside of the chucking opening; and the first and second shutters expose or cover the head opening cooperatively, wherein while closed, the first and second shutters define a continuous center hole that has a diameter approximately equal to that of the chucking opening.