Patent ID: 7131607

Claim:
A recording tape cartridge for rotatably accommodating a reel on which a recording tape is wound for use with a drive, the cartridge comprising: a reel, the reel including a hub and a flange, the hub including, at an end of the hub, a substantially annular reel rotation gear, and, at an inner side of the reel rotation gear, a plate which is attractable to a magnetic portion of a drive for playing the recording tape, and at an inner side of the plate, a hole configured to accept a projection, and configured to accept a release pin of a rotating shaft of the drive, and the flange including, at an outer circumference thereof, a braking gear; a case accommodating the reel and including a braking member movable between positions engaged and disengaged with the braking gear, and a spring seat disposed between the reel and the case, the projection being disposed on the spring seat.