Patent ID: 6874159
Filing Date: 2005-03-29
Classification: G11B

Abstract:
1. A cartridge for encasing either of a first recording medium and a second recording medium different in diameter from the first recording medium, the cartridge comprising: a cartridge body consisting of an upper shell and lower shell, butted to each other, the upper shell having formed in the main side thereof an insertion/removal opening having a diameter larger than the first recording medium and through which the first and second recording media are to be inserted and/or removed and the lower shell having a first opening formed therein; a middle shell having the main side thereof exposed to outside through the insertion/removal opening in the upper shell of the cartridge body, defining together with the insertion/removal opening a recording medium receptacle which selectively receives the first and second recording media, having formed therein a second opening corresponding to the first opening in the lower shell of the cartridge body and which is rotatably received in the cartridge body; and a pair of shutter members installed to the middle shell at the side of the lower shell side and which uncovers the first and second openings when the middle shell rotates until the first and second openings are aligned with each other; the recording medium receptacle including a first recording medium holder in which the first recording medium is rotatably held and a second recording medium holder in which the second recording medium is rotatably held, the first and second recording medium holders being provided concentrically with each other.