Patent ID: 6934962
Filing Date: 2005-08-23
Classification: G11B

Abstract:
1. An information recording medium cartridge provide with a disc-like information recording medium, a cartridge casing having the information recording medium 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 movably mounting the shutter to the cartridge casing in a direction to open and close the openings, wherein 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 of the cartridge casing, wherein the first and second shutter plates are independently moved between a first position for closing the recording and/or reproducing openings arranged in the right and reverse sides of the cartridge casing and a second position for opening the recording and/or reproducing openings, the first and second shutter plates are of a size large enough to close the recording and/or reproducing openings arranged in the right and reverse sides of the cartridge casing and substantially the same width as that of the openings, and that in the first position for closing the recording and/or reproducing openings, the first and second shutter plates are formed to overlap one another in a vertical direction of the cartridge casing, the first and second slide portions are provided with a shutter-plate mounting portion formed by dividing the slide member in a moving direction and a stage protrusively formed at one side of the shutter-plate mounting portion by dividing the slide member in a thickness direction and having substantially half a length of the shutter-plate mounting portion in the moving direction, and part of the shutter-plate mounting portion of one of the first and second slide portions is supported in a state placed on the stage of another slide portion.