Patent ID: 7055164

Claim:
A disc cartridge comprising: a cartridge body having a receiving space therein, a receiving port formed at an outer edge thereof, and a rib acting as a guide member formed at an outer periphery of the receiving space, the receiving port including a part of a concave shape; and a disc holder insertable into the cartridge body, the disc holder having a pair of semi-circular tension arms for grasping a disc therebetween, each tension arm having a shoulder being integrally formed at an outer lateral portion of the tension arm and extended outwardly therefrom for contacting and engaging the rib in the cartridge body as the disc holder is inserted into the cartridge body, wherein the disc holder has a holding portion that engages with the receiving port, the holding portion includes a part of a convex shape, and the part of the convex shape engages with the part of the concave shape, when the holding portion engages with the receiving port, whereby, as the disc holder is inserted into the cartridge body, the shoulders are guided along the rib outwardly toward respective lateral walls of the cartridge body so that the tension arm integrally formed with the shoulders are pushed outwardly toward the respective lateral walls of the cartridge body for thereby releasing the disc grasped therebetween, wherein outside edges of the part of the convex shape of the holder portion and the part of the concave shape of the receiving port extend beyond outside edges of a drive spindle window included in the disc cartridge.