Patent ID: 7337454

Claim:
A disc cartridge, comprising; an opening provided in a cartridge main body, that contains a disc-like shaped recording medium in such a manner that the recording medium is allowed to rotate inside the cartridge main body, for exposing part of the recording medium; a shutter for opening and closing the opening, the shutter having a shielding section for covering the opening when the shutter is closed, and a sliding section for sliding on a shutter sliding surface of the cartridge main body during opening and closing operation; a protrusion section, provided on the shutter sliding surface of the cartridge main body and being arranged so as to be about at least a part of a periphery of the opening, the protrusion section being covered by the shielding section when the shutter is closed; and wherein the shutter is so provided to have a space between (i) a facing surface, of the shielding section which is substantially in parallel to the shutter sliding surface, and (ii) a top section of the protrusion section.