Patent ID: 7237247

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 disc exposes the first side inside the disc window; the chucking opening is provided on the bottom of the disc storage portion so as to get the disc chucked externally; and the head opening is also provided 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; a first shutter and a second shutter, which are provided on the bottom of the disc storage portion to expose or cover the head opening; a groove, which is provided on, and extends along, a first side surface of the cartridge body; an opener/closer, which protrudes through the bottom of the groove and which moves along the groove, thereby opening or closing the first and second shutters; a first concave portion, which is provided on the first side surface of the cartridge body; and a second concave portion, which is provided on a second side surface of the cartridge body, the second side surface being opposed to the first side surface, wherein the first concave portion is continuous with the groove on the first side surface and has a bottom that is deeper than the bottom of the groove, and wherein the bottom of the first concave portion and the bottom of the groove are connected together by a sloped surface that defines a predetermined angle with the bottom of the first concave portion.