Information recording medium cartridge

摘要

An information recording medium cartridge is provide with a disc, a cartridge casing having the disc accommodated therein, a shutter slidably mounted to the cartridge casing and for opening and closing recording and/or reproducing openings arranged in right and reverse sides of the cartridge casing, and a slide member for mounting the shutter to the cartridge casing. The shutter is provided with a first shutter plate for opening and closing the recording and/or reproducing opening arranged in one of the right and reverse sides of the cartridge casing and a second shutter plate for opening and closing the recording and/or reproducing opening arranged in another side. The first and second shutter plates are independently moved between first and second positions for closing and opening the recording and/or reproducing openings arranged in the right and reverse sides of the cartridge casing. The first and second shutter plates are of a size enough large to close the recording and/or reproducing openings and substantially the same width as that of the openings. In the first position for closing the recording and/or reproducing openings, the first and second shutter plates overlap one another in the vertical direction of the cartridge casing.