Patent ID: 8627346

Claim:
A disc cartridge comprising: a case body capable of receiving a plurality of disc-shaped recording media in parallel to an axial direction of a center pin thereof so that a first shell having a base surface portion parallel to a recording surface of the disc-shaped recording media and a second shell having a base surface portion parallel to the recording surface of the disc-shaped recording media are coupled to or separated from each other by engagement or disengagement in the axial direction; and a lock lever pivotally supported on a surface perpendicular to the axial direction in the case body and locking the first shell and the second shell in a coupled state, wherein the first shell and the second shell are separated to form a disc insertion/extraction hole through which the disc-shaped recording media are inserted into or discharged from the case body, wherein a support shaft serving as a pivoting point of the lock lever is installed to the case body, and wherein the lock lever includes a supported portion supported by the support shaft, a lock portion protruding from the supported portion and locking the first shell and the second shell, and a balance portion protruding from the supported portion in a direction approximately opposite to the direction in which the lock portion protrudes wherein the difference between the diameter of the center pin inserted into a center hole of the received disk-shaped recording media and the diameter of the center hole of the disc-shaped recording media is set to A, wherein the difference between the diameter of a circle extending from an arc of a regulating surface formed at the balance portion of the lock lever for regulating the location of the disk shaped recording media and the diameter of the disc-shaped recording media is set to B, wherein the difference between the outer circumference of the disc-shaped recording media and the inner surface of an opening/closing panel installed to the first shell for opening or closing the disk insertion/extraction hole when the disc-shaped recording media is pressed to the center pin in a direction of being inserted from the disc insertion/extraction hole is set to C, and wherein C>A>B.