| 摘要 |
A disc cartridge capable of reducing a deformation of a disc-shaped recording medium by restraining a thermal influence exerted from a recording/reproducing apparatus when loaded into this apparatus. The disc cartridge includes a shell unit for accommodating an optical disc rotatably and in a shielded state, and a clamp member disposed in the vicinity of a central hole of the disc-shaped recording medium so that when the disc cartridge is loaded into a recording/reproducing apparatus and a clamp shaft of the apparatus is fitted into the central hole, the clamp member contacts with the clamp shaft and is thus clamped, wherein the clamp member is made of a plate material exhibiting a larger temperature diffusion coefficient than those of a substrate material of the optical disc and of a material of the clamp shaft, and a temperature diffusion coefficient of the plate material is equal to or larger than 1x10<-4 >m<2>/s.
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