Patent ID: 7017170

Claim:
A disc cartridge comprising: a disc-shaped recording medium; a main cartridge body unit including an upper shell and a lower shell, the peripheral wall sections of which abut against each other, said main cartridge body unit accommodating said disc-shaped recording medium for rotation therein, at least a portion of the peripheral wall section of said lower shell being opened to form an open end, with an aperture being formed in said main cartridge body unit beginning from said open end for exposing a portion of said disc-shaped recording medium to outside across the inner and outer rims of the disc-shaped recording medium; an inner shell engaged in a guide groove formed between an outer peripheral wall section and an inner peripheral wall section of said upper shell so as to be supported for rotation therein, said inner shell including a connecting portion engaged in said guide groove, said inner shell also including an aperture in register with said aperture in said main cartridge body unit; and a shutter member movable by rotation of said inner shell between a position closing said aperture in said main cartridge body unit and a position opening said aperture in said main cartridge body unit; said connecting portion of said inner shell being set to a height such that said connecting portion is not protruded towards said lower shell relative to the lower surface of said disc-shaped recording medium.