Disc apparatus for accepting a disc having at least one portion for preventing misinsertion

A disc apparatus comprising:

• means for receiving a disc cartridge having a case for storing a disc therein;
• the case having a substantially square shape with first, second, third and fourth edges, the case having the disc therein and having a window for exposing at least a portion of the disc, the window being near the first edge which is the first edge of the disc cartridge inserted into the disc apparatus when properly inserted;
• the first edge of the case being delimited by a first corner portion connecting the first edge and the second edge and a second corner portion connecting the first edge and the third edge;
• a shutter member arranged for sliding movement with respect to the case along the first edge from a first position where the window is closed to a second position where the window is opened, the shutter member having a contact portion in the region of the second corner portion in the first position of the shutter member for being contacted to cause sliding movement of the shutter member toward the second position in a direction toward the first corner portion so that the contact portion in the second position of the shutter member is closer to the second corner portion than the first corner portion;
• and
• the case having a discrimination portion for discriminating proper and improper insertion of the disc cartridge, the discrimination portion being provided in the region of the first corner portion;
• wherein the discrimination portion includes the case itself having at least one of a set back portion set back from the first edge in the region of the first corner portion of the case and a chamfer portion extending between the first and second edges in the region of the first corner portion of the case, the set back portion being formed as part of the case and separate from the shutter member;
• and
• wherein the disc cartridge is an optical disc cartridge having an optical disc therein, the window of the optical disc cartridge being an aperture, the optical disc cartridge having a width equal to the width of a 3.5" floppy disc cartridge prescribed in the ANSI standard for a magnetic disc which is a disc cartridge incompatible with the optical disc cartridge, and a thickness greater than the thickness of the 3.5" floppy disc cartridge prescribed in the ANSI standard, the optical disc cartridge having the first edge as a front edge of the optical disc cartridge and the second edge orthogonal to the first edge, the second edge being a first side edge of the optical disc cartridge, the first edge and the second edge intersecting in the region of the first corner portion of the optical disc cartridge, wherein the 3.5" floppy disc cartridge as prescribed in the ANSI standard has a first edge as a front edge along which a shutter member slides to open or close an aperture provided to expose the floppy disc in the 3.5" floppy disc cartridge and a second edge as a side edge orthogonal to the first edge, the 3.5" floppy disc cartridge having a chamfer portion provided at the intersection of the first edge and the second edge of the 3.5" floppy disc cartridge in a direction that the shutter member at the front edge thereof moves to close the aperture when a bottom surface of the 3.5" floppy disc cartridge has another aperture through which the floppy disc is driven, the optical disc cartridge being provided with the chamfer portion at a part thereof located in the direction in which the shutter member thereof moves to open the aperture of the optical disc cartridge, the chamfer portion of the optical disc cartridge being provided at a side of the optical disc cartridge which is opposite to a side of the 3.5" floppy disc cartridge where the chamfer portion of the 3.5" floppy disc cartridge is provided;
• and
• wherein the receiving means includes loading means for enabling proper loading of the optical disc cartridge.