Patent ID: 7596796

Claim:
A disc recording and/or reproducing apparatus comprising: a disc; and a disc cartridge having a main cartridge body unit configured to house said disc therein and provided in at least one surface thereof with a recording and/or reproducing aperture for exposing a part of said disc across inner and outer rims thereof; wherein an opening for a driving unit, into which is intruded at least a part of rotational driving means, configured for rotationally driving said disc, is formed in one surface of said main cartridge body unit; the inner peripheral surface of said opening for the driving unit operating as a mounting reference plane in a planar direction for mounting the disc cartridge on a recording and/or reproducing apparatus; the peripheral edge of said opening for the driving unit in said one surface operating as a mounting reference plane in the height-wise direction for mounting the disc cartridge on the recording and/or reproducing apparatus; and an annular loading support part configured to position said disc cartridge in the horizontal direction and in the height-wise direction, said loading support part having a ring-shaped center fitting protrusion at an inner periphery fitted in said opening for a driving unit of said disc cartridge, the annular loading support part spaced apart from and surrounding the driving unit, wherein the peripheral edge of the opening is configured to abut against an outer peripheral edge of the annular loading support part.