| 摘要 |
A disc cartridge having rotatably housed an optical disc ( 2 ) is disclosed. The disc cartridge includes a main cartridge body unit ( 5 ) having an aperture for the head part ( 13 ) for exposing a portion of the optical disc to outside across the inner and outer rims of the disc. In one surface of the main cartridge body unit is formed a center opening ( 12 ) into which is intruded a turntable ( 90 ) for rotationally driving the optical disc. An inner peripheral surface ( 81 ) of the center opening operates as a mounting reference plane along the planar direction when mounting the disc cartridge to a recording and/or reproducing apparatus. The rim of the opening of the one surface of the main cartridge body unit operates as a mounting reference surface ( 82 ) along the height-wise direction. The main cartridge body unit has an inserting end side into the recording and/or reproducing apparatus formed as a substantially semicircular arcuate section ( 7 ) having, as center, the center of the optical disc housed in the main cartridge body unit.
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