Patent ID: 7322037

Claim:
A disc cartridge comprising: a casing for receiving a disc therein; a disc holder separably disposable in the casing, having tension arms for elastically holding the disc, and guiding the disc into or out of the casing; and a protruding supporting member being provided within the casing and protruding to a predetermined height from an inner surface of the casing for contacting with and supporting a non-recording region of the disc, the height being equal to or greater than a value H opt =G+D+A, wherein G is vertical deflection of the disc due to gravity, D is a vertical deflection of the tension arms, and A is a gap which must be minimally obtained between the disc and flanges of the tension arms wherein G is 0.2 mm, D is 0.05 mm, and A is 0.1+/−0.05 mm; wherein the height of the protruding supporting member is sufficient to prevent any interference between the disc and tension arms.