Patent ID: 7350731

Claim:
A recording tape cartridge comprising: a reel at which a recording tape is wound around an outer peripheral portion of a hub formed in a hollow-cylindrical shape, the reel being rotatably accommodated within a case; an internal gear provided coaxially at an inner side of the hub, and always rotating integrally with the reel; a locking member supported so as to be unable to rotate with respect to the case, and moving in a radial direction of the hub so as to be able to be set at a rotation locking position at which the locking member meshes with the internal gear, and a releasing position at which the locking member cancels the meshing; a rotating cam member supported so as to be able to rotate with respect to the case, the rotating cam member and the locking member structuring a positive motion cam, in which the rotating cam member rotates toward one direction and moves the locking member from the rotation locking position to the releasing position, and rotates toward another direction and moves the locking member from the releasing position to the rotation locking position; and an operated member disposed so as to be exposed to an exterior of the case, and rotating the rotating cam member one of toward the one direction and toward the other direction in accordance with a direction in which the operated member is operated by a drive device.