| 摘要 |
A disk cartridge is constituted by a case for holding a disklike medium therein, a slidable shutter, and a coil spring. The case has an upper case and a lower case coupled together. The upper case and the lower case is provided with a hole for inserting a record-playback head and a hole for inserting a driving shaft. The slidable shutter is substantially U-shaped in cross section, and exposes and blocks up the openings. The shutter is formed of a left-side shutter and a right-side shutter. The coil spring is stretched between retaining portions provided to the sliders of the respective left- and right-side shutters in order to urge the left- and right-side shutters in the direction of bringing both shutters close to each other. The left- and right-side shutters are abutted each other to block up the opening by the urging force of the coil spring. The left- and right-side shutters are slid in the direction of parting both shutters from each other against the tensile strength of the coil spring in order to expose the openings.
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