DISC CARTRIDGE, DISC RECORDING MEDIUM UNIT AND DISC RECORDER AND/OR REPRODUCER

摘要

A disc cartridge comprising a cartridge case having an upper shell, a rotary member and a lower shell, a shutter member for opening/closing the opening of the cartridge case, and a shutter fixing means for holding the shutter member in a closed state at a close position, wherein the shutter member is held in an open state at an open position by the shutter fixing means. Since a vibration generated from an external apparatus has no possibility of being transmitted through an open holding mechanism to the disc cartridge, or the like, erroneous operation due to vibration can be prevented at the time of read/write.