Patent ID: 7082611

Claim:
A disk cartridge for containing a disk form recording medium therein, including an opening through which a head for reading or writing information recorded on said recording medium is inserted, comprising: a first shell and a second shell disposed opposite to said first shell, for constituting therebetween a containing space for containing said recording medium; a rotor disposed in said containing space so as to be rotatable around the center of rotation of said recording medium; and a shut-up mechanism for restraining the rotation of said recording medium relative to said first shell, wherein said shut-up mechanism comprises, a first cam formed in said rotor; a cam follower capable of linear motion along said first cam of said rotor; and a second cam; wherein said second cam is pressed by said cam follower to restrain the rotation of said recording medium relative to said first shell; wherein any one of said first shell, said second shell, and said rotor is provided with a first wall, while another of said first shell, said second shell, and said rotor is provided with a second wall; wherein said first wall and said second wall constitute a labyrinth structure.