| 摘要 |
A shutter member can positively be unlocked. A disc cartridge including a disc, a cartridge body having the disc rotatably housed therein and having formed therein a write and/or read aperture through which part of the disc is exposed to outside in a range between inner and outer radii thereof, a shutter member including a shutter portion to open and close the write and/or read aperture and installed to the cartridge body to be movable between positions to close and open the write and/or read aperture, a connecting arm extending from one lateral side of the shutter member, an elastic moving piece installed to extend along the connecting arm with the base end thereof being fixed to the free end of the connecting arm, having a pressing piece provided at the base end of the shutter member to face a window formed in a movement guide piece opposite to the one lateral side of the cartridge body and forced for the pressing piece to project to outside the cartridge body through the window, and a shutter movement limiting member provided pivotably on the shutter member to limit, when the shutter member is in the position to close the write and/or read aperture, the shutter member from moving in a direction to open the write and/or read aperture by engaging an engagement piece on a movement limiter provided on the cartridge body, and to pivot along with the elastic moving piece in a direction disengaging the engagement piece from the movement limiter when the elastic moving piece is pressed by means of the pressing piece against the force applied to the latter, the engagement piece being formed circular at the side of the movement limiter.
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