Abstract: A disc cartridge can prevent a disc from being damaged, and smoothly enable a disc rotation, by forming a protruding supporting member to have a predetermined height from an inner surface of a casing receiving the disc, and by preventing the disc from interfering with an outer surface of the casing or other components. The structure of the disc cartridge includes the casing receiving the disc, and a disc holder disposed separably at the casing, having tension arms elastically holding the disc, and guiding the disc into or out of the casing, the protruding supporting member having a predetermined height from the inner surface of the casing and being contacted with a non-recording region of the disc, which height is equal to or greater than a sum of a vertical deflection of the disc due to gravity, a vertical deflection of the tension arms, and an air gap which must be maintained between surfaces of the disc and flanges of the tension arms.

Abstract: A disc cartridge can prevent a disc from being damaged, and smoothly enable a disc rotation, by forming a protruding supporting member to have a predetermined height from an inner surface of a casing receiving the disc, and by preventing the disc from interfering with an outer surface of the casing or other components. The structure of the disc cartridge includes the casing receiving the disc, and a disc holder disposed separably at the casing, having tension arms elastically holding the disc, and guiding the disc into or out of the casing, the protruding supporting member having a predetermined height from the inner surface of the casing and being contacted with a non-recording region of the disc, which height is equal to or greater than a sum of a vertical deflection of the disc due to gravity, a vertical deflection of the tension arms, and an air gap which must be maintained between surfaces of the disc and flanges of the tension arms.

Abstract: An optical disc cartridge that is capable of assuring the degree of the freedom in an optical disc and a disc holder. In the cartridge, the optical disc and a tension arm are spaced from each other into more than a minimum height for preventing their mutual interference in consideration of a thickness and a deformation amount of the optical disc. Also, a flange and a case are spaced from each other into more than a minimum height for preventing their mutual interference in consideration of a deformation amount of the disc holder and a thickness of the flange.