Patent ID: 6370108
Filing Date: 2002-04-09
Classification: G11B

Abstract:
A disc cartridge comprising:a casing constituted of an upper casing member and a lower casing member joined to each other, said upper casing member and lower casing member each being formed with an opening through which a recording/reproducing head and a drive shaft of a recording/reproducing apparatus are inserted into said casing; a cover arranged between said upper casing member and said lower casing member in a manner to be drawable out of said casing and rotatably mounted thereon with a recordable/reproducible disc shaped medium; a shutter formed to have a U-shape in section and slidably arranged on said casing so as to selectively open and close said openings of said upper casing member and lower casing member; and an erasure preventing plug arranged in said cover; said upper casing member and lower casing member being formed with first and second cutouts, respectively; said cover being provided with first and second projections fitted in said first and second cutouts of said upper casing member and lower casing member, respectively; said first and second cutouts of said upper casing member and lower casing member and said first and second projections of said cover cooperating with each other to provide an operation hole for said erasure preventing plug and a detection hole therefor, respectively; said first cutout and said second cutout being positioned so as to be in alignment when said upper casing member and said lower casing member are joined to each other so that an operation projection of said plug is movably fitted in said operation hole and a detection projection of said plug is movably fitted in said detection hole.