Patent ID: 7059554

Claim:
A recording tape cartridge comprising: a reel including a reel hub formed in a tubular shape with a base, recording tape being wound on an outer peripheral portion of the reel hub; an annular reel gear provided coaxially at an outer face of a base portion of the reel hub and capable of meshing with a driving gear of a drive device; an engaging portion provided at an inner face of the base portion along a circular circumference which is coaxial with the base portion; a case including a gear aperture, rotatably accommodating the reel, and exposing the reel gear through the gear aperture; a brake member provided to be non-rotatable relative to the case and movable toward and away from the base portion, the brake member being capable of attaining a rotation-locking position for engaging with the engaging portion and a rotation-enabling position for releasing a state of engagement with the engaging portion; an urging structure provided between the case and the brake member, the urging structure retaining the brake member at the rotation-locking position by an urging force; and a release member including a main body portion disposed in the reel hub at a radial direction inner side relative to the engaging portion, and an operation portion provided at the main body portion and facing the gear aperture through a portion of the base portion at a radial direction inner side relative to the reel gear, the release member being provided to be non-rotatable relative to the reel and movable in an axial direction, and the operation portion being pushed by a releasing portion of the drive device for moving the brake member to the rotation-enabling position against the urging force.