Patent ID: 7343612

Claim:
A disc cartridge comprising: a cartridge main body formed by aligning and bonding paired upper and lower halves to rotatably contain a disc therein and having a drive aperture for receiving rotary disc drive means for driving the disc to rotate at least one of a recording and reproduction aperture to be exposed to at least one of recording and reproduction means for at least one of recording information on and reproducing information from the disc only on a first surface of the cartridge main body; a shutter member having a shutter section for closing at least one of the recording and reproduction aperture and fitted to the cartridge main body so as to be supported at a lateral side perpendicular to the first surface of the cartridge main body and able to open and close at least one of the recording and reproduction aperture; and a shutter guide member arranged between the drive aperture and at least one of the recording and reproduction aperture to support the shutter section at a front end thereof, wherein the shutter guide member is provided with an arc-shaped notched section matching the peripheral edge of the circular drive aperture.