An optical recording and/or reproducing apparatus for selectively accommodating an adapter and at least two differently sized disc cartridges as recording/reproducing mediums, the cartridges accommodating respective differently sized discs and the adapter accommodating a disc having a diameter of 8 cm, each of the recording/reproducing mediums having an accommodating hole, an opening, and a shutter slidably disposed thereon to open/close the accommodating hole and the opening, the optical recording and/or reproducing apparatus comprising:
- a case forming an interior space;
- a tray mounted to the case and insertable into and withdrawable from the interior space, the tray accommodating a selected one of:
- first and second disc cartridges, the adapter, and the naked disc as the selected recording/reproducing medium;
- supporting means for supporting the selected recording/reproducing medium on the tray, so as to prevent movement of the selected recording/reproducing medium relative to the tray;
- first positioning means for determining a first position of the first disc cartridge on the tray;
- first detecting means for detecting a size of the first disc cartridge positioned on the tray by the first positioning means, and a state of a disc accommodated in the first disc cartridge;
- second positioning means for determining a second position of the second disc cartridge on the tray;
- second detecting means for detecting a size of the second disc cartridge positioned on the tray by the second positioning means, and a state of the disc accommodated in the second disc cartridge;
- third detecting means for detecting the adapter positioned on the tray, and a state of the disc accommodated in the adapter;
- disc rotating means for rotating the disc of the selected recording/reproducing medium positioned on the tray;
- information recording/reproducing means for recording information on and/or reproducing the information from the disc rotated by the disc rotating means;
- shutter opening/closing means for opening/closing the shutters in accordance with the reception/withdrawal of the tray with respect to the case;
- disc chucking means for pressing a hub of the disc accommodated in the selected recording/reproducing mediums, to chuck the disc onto the disc rotating means;
- and
- a movable deck base on which the disc rotating means and the information recording/reproducing means are mounted, the deck base positioned in the case;
- wherein the disc rotating means and the information recording/reproducing means are movable into an operative position in response to insertion of the tray into the case, and movable to an inoperative position in response to withdrawal of the tray from the case.