Patent ID: 6959888

Claim:
A magnetic tape cartridge comprising: a reel around which a magnetic tape is wound; a cartridge case which houses said reel in a locked position; a release pad for releasing said reel from being locked, said release pad having a lower surface and a plurality of lock release pins which extend from said lower surface; and a cup-like hub of said reel in which said release pad is mounted, said cup-like hub having a base plate, wherein a plurality of guide holes, for allowing said plurality of lock release pins to penetrate therein, are made in a periphery of said base plate, and a plurality of pairs of guide ribs which are capable of respectively guiding said plurality of lock release pins to said plurality of guide holes, stand inside said cup-like hub corresponding to said plurality of guide holes, and wherein said plurality of pairs of guide ribs are respectively separated by a gap into which said plurality of lock release pins are respectively inserted, and the gap is increased in a direction towards a center of said base plate.