Abstract: A disk cartridge includes a main body of the cartridge having an opening or its major surface by which the signal recording surface of an optical disk accommodated in the main body is exposed to outside and an aperture formed on the lateral surface orthogonal to the major surface of the main body for enabling the optical disk to be inserted into and taken out of the cartridge for disk exchange. The disk cartridge also an opening/closing member which is rotatably supported by the main body by pivot pins provided at its one end for engaging in recesses in the aperture in the main body, for opening and closing the aperture and, which is provided at its other end with a resilient arm having a retaining end pawl engageable with a mating retaining section in the main body. By actuation of the opening/closing member, the aperture in the main body is opened or closed to permit exchange of the optical disk.

Abstract: A disk cartridge includes a main body of the cartridge having an opening on its major surface by which the signal recording surface of an optical disk accommodated in the main body is exposed to the outside and an aperture formed on the lateral surface orthogonal to the major surface of the main body for enabling the optical disk to be inserted into and taken out of the cartridge for disk exchange. The disk cartridge also has an opening/closing member (21) which is rotatably supported by the main body by pivot pins (28) provided at its one end for engaging in recesses in the aperture in the main body, for opening and closing the aperture and, which is provided at its other end with a resilient arm (34) having a retaining end pawl engageable with a mating retaining section in the main body. By actuation of the opening/closing member, the aperture in the main body is opened or closed to permit exchange of the optical disk.

Abstract: A disk cartridge having a disk cartridge-body in which a disk-shaped record medium is rotatably accommodated and an information signal can be recorded on the disk-shaped record medium, the disk cartridge-body having an opening portion to exchange therethrough the disk-shaped record medium, an openable and closable member for opening and closing the opening portion through which the disk-shaped record medium is exchanged and a write-protecting mechanism formed on the openable and closable member to determine whether or not an information signal can be recorded in the disk-shaped record medium.

Abstract: A data storage case having a write/protect assembly includes a main body of the cartridge, a plurality of detection holes formed in the lateral side and on two flat sides of the main body of the cartridge adjacent a corner of the front side of the main body of the cartridge relative to the direction of insertion of the main body of the cartridge into the interior of the recording/reproducing apparatus, and mating detection elements inserted into these detection holes. The main body of the cartridge accommodates a disk-shaped recording medium, on which information signals can be recorded, and has apertures through which the signal recording section of the disk-shaped recording medium is exposed to outside. The mating detection elements may be moved between a first position and a second position within the detection holes.