Patent ID: 6700742
Filing Date: 2004-03-02
Classification: G11B

Abstract:
A magnetic tape cartridge comprising:a cartridge case in which a single reel with magnetic tape wound on the outer periphery of a reel drum rotatably housed; and a locking member, provided within said reel drum so that it is movable between a locking position and an unlocking position in an axial direction of said reel, for locking said reel to restrain rotation of said reel during periods of non-use; wherein a first radial clearance between said locking member and said reel drum is set smaller than a second radial clearance between said reel and said cartridge case; wherein, during a movement of the reel within the cartridge case, the locking member is adapted to contact the reel drum and prevent contact between the reel and the cartridge case, and wherein said reel drum has reinforcement ribs on the inner peripheral surface thereof; and said first radial clearance is the clearance between the outer peripheral surface of said locking member and the outer ends of said ribs.