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    • 1. 发明专利
    • CARTRIDGE
    • CA1189616A
    • 1985-06-25
    • CA405447
    • 1982-06-18
    • NAKAGAWA KOICHIROSUYAMA SATOSHIYANAGI MASAHIRONAKAJIMA YASUTAKA
    • NAKAGAWA KOICHIROSUYAMA SATOSHIYANAGI MASAHIRONAKAJIMA YASUTAKA
    • G11B17/04G11B23/00G11B23/033G11B23/04G11B17/02
    • A cartridge containing therein a rotatable recording medium disc has fixed at its center a disc hub. The disc hub has a first hub portion positioned on one side of the disc and a second hub portion coaxial with the first hub portion and positioned on the other side of the disc. The casing has a first casing element and a second casing element holding the disc therebetween. The first casing element has a first center window in which the first hub portion is inserted; a first head window in which a head for recording and/or reproducing information on the disc can be inserted from outside the cartridge; and a first shutter member movably supported by the first casing element for opening and closing the first window. The second casing element has a second center window coaxial with the first center window and in which the second hub portion is inserted; a second head window in which a head for recording and/or reproducing information on the disc can be inserted from outside the cartridge; and a second shutter member movably supported by the second casing element for opening and closing the second opening. The cartridge further has a shutter actuating member movably supported by the casing and coupled to the first and second shutter members for moving the shutter members, the shutter actuating member having an exposure portion exposed to the outside of said casing and moved by an external force applied to the exposure portion in a direction parallel to a side edge of the casing.