Disc cartridge, and method of installing shutter to same

A method of assembling a shutter member to a disc cartridge,

• the disc cartridge including:
• a body having a disc housed rotatably therein;
• a driving aperture through which a disc rotation driving mechanism to rotate the disc accesses the disc in the cartridge body and a write and/or read aperture through which information signals are to be written to or read from the disc, both apertures being formed at one side of the cartridge body;
• a shutter member including a shutter plate portion to open and close the write and/or read aperture, movement guide piece formed to rise form the shutter plate portion, support pieces provided in a plurality of places spaced from each other in the sliding direction of the shutter plate portion and which are bent from the movement guide piece and supported on a sliding guide portion of the disc cartridge, and engagement pieces projected toward the support pieces to the shutter plate portion to hold the sliding guide portion between themselves and the support pieces;
• the sliding guide portion including a guide recess in which the support pieces of the shutter member are to be inserted to be slidable and a guide rail portion on which the engagement pieces are fitted and which supports the shutter member to be slidable;
• and
• a cut formed in the guide recess formed to have such a taper that the depth thereof at the upstream side in the direction to open the write and/or read aperture is larger than that at the downstream side,
• the method comprising the steps of:
• inserting, with the shutter member being held at a slant, the support pieces into the cut at the deep side from the upstream side in the direction to open the write and/or read aperture;
• and
• fitting the engagement pieces into the guide recess in the guide rail portion for the support and engagement pieces to catch the guide rail portion between them.