Patent ID: 7218477

Claim:
An information recording medium cartridge provide with a disc information recording medium, a cartridge casing having the information recording medium accommodated therein, a shutter which opens and closes recording and/or reproducing openings arranged in right and reverse sides of the cartridge casing, and a slide member which movably mounts the shutter to the cartridge casing in a direction to open and close the openings, wherein the shutter is divided into 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 of the cartridge casing, characterized in that the slide member is divided into a first slide portion to which the first shutter plate is mounted and a second slide portion to which the second shutter plate is mounted, wherein the first and second shutter plates are provided with a shutter main body which overlaps the right side or the reverse side of the cartridge casing to open and close the opening and a slide-member mounting portion for mounting the first and second slide portions to the shutter main body at an end, and wherein the slide-member mounting portion is provided with an engaging claw, wherein when mounting the first and second slide portions, the engaging claw is engaged with a claw engagement provided to the slide portion wherein a length of the slide member is substantially the same as a width of the shutter main body of the shutter plate, and a width of the slide-member mounting portion is smaller than the width of the shutter main body.