Patent ID: 7286323

Claim:
A recording disk cartridge comprising: a plurality of flexible recording disk media which are stacked inside a cartridge case so as to rotate integrally, wherein the cartridge case comprises a lower plate for constructing a lower wall parallel to the plurality of recording disk media, a plurality of inner plates which are stacked and fixed on the lower plate and partition the plurality of recording disk media, and an upper plate which is stacked and fixed on the plurality of inner plates and constructs an upper wall of the cartridge case, an opening being formed in a part of a side wall constructed of the lower plate, the plurality of inner plates, and the upper plate; a lower rotor supported on an inner side of the lower plate so as to rotate; an upper rotor supported on an inner side of the upper plate so as to rotate; and a shutter plate having a lower end rim engaged with the lower rotor and an upper end rim engaged with the upper rotor so as to open and close the opening, and a height, between the lower end rim and the upper end rim of the shutter plate, corresponding to a height of the stacked recording disk media.