Patent ID: 7673312

Claim:
A cartridge for a photosensitive recording medium comprising: a cartridge body having a disc accommodation space for accommodating the photosensitive recording medium rotatably and an inner opening for exposing a central portion and a recording surface of the photosensitive recording medium to an outside; a light shield plate having an outer opening and fixed to the outside of the cartridge body; and a shutter which is provided between the cartridge body and the light shield plate and is movable between a closing position where to close the inner opening and an opening position where to open the inner opening, wherein: a closing-side end of the shutter and at least one of a closing-side edge of the inner opening and a closing-side edge of the outer opening are inclined from each other; a cartridge-inserting-side width and a cartridge-removing-side width of the shutter are different from each other, so that the closing-side end of the shutter and at least one of the closing-side edge of the inner opening and the closing-side edge of the outer opening are inclined from each other.